CN1189943A - Appts. and method of controlling transmitting power and transmit rate of wireless telecommunications system - Google Patents

Abstract

A wireless telecommunications system (1) includes a central terminal (10) for transmitting and receiving radio frequency signals to and from a subscriber terminal (20). The wireless telecommunications system (1) operates in one of three operating modes. In an acquisition mode during establishment of the downlink communication path, the downlink signal (212) is transmitted at a high power level and a low transmit rate with the receiver (202) operating at the low transmit rate. In a standby mode after establishment of the downlink communication path, the downlink signal (212) is transmitted at a low power level and a low transmit rate with the receiver (202) operating at the low transmit rate. In a traffic mode upon a request for wireless communication transmission, the downlink signal (212) is transmitted at a high power level and a high transmit rate with the receiver (202) adjusting to operate at the high transmit rate. Upon completion of the wireless communication transmission, the wireless telecommunications system (1) returns to the standby mode and the receiver (202) adjusts to operate at the low transmit rate.

Description

The transmitting power of control radio telecommunications system and the apparatus and method of emission rate

Technical field

The present invention relates generally to a kind of telecommunication system, relate in particular to a kind of apparatus and method of setting up and keeping communication path in the radio telecommunications system.

Background technology

Radio telecommunications system needs Receiver And Transmitter to send and receive information on the radiofrequency signal in net structure.These transmitter and receivers may be subjected to the interference of other inside and outside transmitter and receiver of net structure.This interference may be owing to each transmitter that is operated on the different transmit power levels causes.The transmitting power that controls transmitter at each transmitter place only, rather than carry out from the center.And the transmitting power of the transmitter in the radio telecommunications system is unmanageable with respect to the transmitting power of other transmitter in the system.Therefore, requirement can improve the control to the transmitting power of each transmitter in the radio telecommunications system.

And radio telecommunications system requires to set up radio link between corresponding transmitter and receiver, so that wireless communication transmissions to be provided.When realizing obtaining and set up every radio link, can produce and disturb and delay.It will make when per call is initial and obtain and to set up radio link efficiency low.If cause the calling of well afoot whether can keep radio link owing to keep the required power of radio link, also can produce the problem of interference.Therefore, require to avoid setting up radio link, and avoid being inserted in the radio telecommunications system by keeping radio link continuously disturbing for per call.

In addition, transmitter transmits with a kind of phase place usually, and receiver is usually with a kind of different phase place received signal.Transmitter and receiver in the system uses different phase places may cause a plurality of from the right information problem of transmitter and receiver.And the receiver with a kind of phase place requires a large amount of circuit and software support, to identify the information with the corresponding transmitter of out of phase work.In addition, the phase difference between the Receiver And Transmitter also may be subjected to the influence that change path delay between the transmitter and receiver.Therefore, requirement can be controlled the phase place of the transmitter and receiver in the radio telecommunications system, to provide through improved radio signal transmission.

The emission function in starting resource or source, destination sends information with a kind of phase place, and source, destination or starting resource receiver may receive information with different phase places.In this case, receiver does not know partly to begin to receive which of data flow to handle.Information is cut apart framing, and should discern the starting point of every frame for process information suitably.The conventional art of frame alligning information is trouble and slowly in frame identification, and possible drop-out frame.Therefore, requirement can be fast and is easily identified the starting point of the every frame of information, to carry out suitable processing.

Summary of the invention

According to an aspect of the present invention, provide a kind of in the user terminal of radio telecommunications system the method for control transmitting power, it is eliminated basically or has reduced shortcoming relevant with conventional wireless system and problem.

According to one embodiment of present invention, the method for transmitting power in the user terminal of control radio telecommunications system comprises the Down-Link Communications path of the receiver in foundation is from the transmitter in the central terminal to user terminal.Transmitter transmitting downstream line signal in the central terminal, and the receiver place in user terminal receives.Downlink communication path road signal comprises power control signal, is used to regulate the transmitting power of the transmitter in the user terminal, to set up the uplink communication path between transmitter in user terminal and the receiver in the central terminal.

The transmitting power that this technological merit on the one hand of the present invention is the transmitter in the external control user terminal.Another technological merit is by the overhead channel control transmitting power of overhead channel in the down link signal from the central terminal to the user terminal.Another technological merit is that the incremental adjustments that increases and reduce can be provided the transmitting power of the transmitter in the user terminal.Another advantage is to regulate transmitting power, to mate with the transmitting power of other user terminal of being served by central terminal.

According to another aspect of the present invention, provide the synchronous apparatus and method of transmitter in a kind of user terminal that makes radio telecommunications system, it is eliminated basically or has reduced shortcoming and the problem relevant with the traditional wireless communication technology.

According to one embodiment of present invention, make the interior synchronous method of transmitter of user terminal of radio telecommunications system comprise the Down-Link Communications path of foundation from the central terminal to the user terminal.Transmitter transmitting downstream line signal in the central terminal, and the receiver place in user terminal receives.Receiver in the user terminal extracts the sign indicating number synchronizing signal from down link signal.The sign indicating number synchronizing signal is used to regulate the phase place by the uplink signal of the emission of the transmitter in the user terminal.Receiver in the central terminal monitors the phase place of uplink signal, and changes a sign indicating number synchronizing signal, with the coupling of the phase place of the phase place that obtains uplink signal and the receiver in the central terminal.

The transmitter, phase that this technological merit on the one hand of the present invention is the transmitter in the remote adjustment user terminal.Another technological merit is to obtain the transmitter, phase of the transmitter in the user terminal and the phase matched at the receiver place in the central terminal.Another advantage is that the sign indicating number synchronizing signal is inserted in the down link signal of being launched by central terminal, with the transmitter, phase of the transmitter in the incremental adjustments user terminal.Another technological merit is the transmitter, phase of the transmitter in the monitoring user terminal constantly, to keep consistent with the phase matched of receiver in the central terminal.

According to another aspect of the present invention, provide the device and/or the method for the information that transmits and receives in a kind of radio telecommunications system, it is eliminated basically or has reduced shortcoming and the problem relevant with the traditional wireless communication technology.

According to one embodiment of present invention, the method for emission information is included under the obtaining mode with first transmitting power and the first emission rate transmitting downstream line signal in radio telecommunications system, sets up the Down-Link Communications path.Under run-up mode with second transmitting power and the first emission rate transmitting downstream line signal.After the radiotelephone call request, promptly with first transmitting power and the second emission rate transmitting downstream line signal.

This technological merit on the one hand of the present invention provides the multiple mode of operation with different transmission power and different emission rates.Another technological merit is to provide low transmitting power with low rank bitumite rate of fire during system's idling cycle.Another technological merit is to change effectively between different transmission power and different emission rate.

According to another aspect of the present invention, provide a kind of in built-in device and/or the method for making line road communication path of radio telecommunications system, it is eliminated basically or has reduced shortcoming and the problem relevant with the traditional wireless communication technology.

According to one embodiment of present invention, comprise the down link signal that the transmitter emission in the central terminal has the primary key sequence in the built-in method of making line road communication path of radio telecommunications system.Receive this down link signal at the receiver that has in the user terminal of sign indicating number sequence.Receiver in the user terminal compares its primary key sequence from sign indicating number sequence and down link signal, to carry out sign indicating number and phase matched.Receiver is regulated its phase place from the sign indicating number sequence, with the phase matched of primary key, determine that transmitter in the central terminal is to path delay of the interior receiver of user terminal.

This technological merit on the one hand of the present invention is the primary key sequences match from sign indicating number sequence and down link signal.Another technological merit be regulate receiver from the sign indicating number sequence phase, with down link signal in primary key sequence phase coupling.Another technological merit is to provide fine tuning and coarse adjustment to receiver from the sign indicating number sequence phase.Another technological merit is the combined power level of measuring from sign indicating number sequence and primary key sequence, to obtain the sign indicating number sequences match.

According to a further aspect in the invention, provide a kind of in radio telecommunications system frame alligning information device and/method, it is eliminated basically or has reduced shortcoming and the problem relevant with the conventional frame location technology.

According to one embodiment of present invention, the receiver place that the method for frame alligning information is included in the user terminal in radio telecommunications system receives the down link signal that is loaded with by the information of central terminal transmitter emission.Identify the frame position starting point of information frame according to down link signal.In order to guarantee frame alignment accurately, identify in succession the frame position starting point in succession of information frame.After successfully identifying two starting points in succession of frame position, the Down-Link Communications path of the receiver in setting up from the transmitter in the central terminal to user terminal.

This technological merit on the one hand of the present invention is the frame position starting point that identifies an information frame exactly.Another technological merit is the bit position by down link signal gradually, to identify the starting point of frame position.Another technological merit is the overhead channel that the Frame Aligning Word of expression frame position starting point is decoded as down link signal.Another technological merit is the frame position starting point of monitor subsequent information frame constantly.

Summary of drawings

Below with reference to accompanying drawings,, in the accompanying drawings, adopt identical mark for identical feature by only describing one embodiment of the present of invention as an example, wherein:

Fig. 1 is the simplified schematic diagram of one of radio telecommunications system example, has comprised an example of the present invention in this system;

Fig. 2 is the schematic diagram of one of user terminal example of the telecommunication system of Fig. 1;

Fig. 3 is the schematic diagram of one of central terminal example of the telecommunication system of Fig. 1;

Fig. 3 A is the schematic diagram of modulator-demodulator frame of central terminal of the telecommunication system of Fig. 1;

Fig. 4 is the figure of one of frequency scheme example of the telecommunication system of Fig. 1;

Fig. 5 A and 5B describe the schematic diagram that the sub-district of the telecommunication system of Fig. 1 may structure;

Fig. 6 is the schematic diagram of some aspects of code division multiplex system of describing the telecommunication system of Fig. 1;

Fig. 7 is that the signal of describing the telecommunication system of Fig. 1 is launched the schematic diagram of handling level;

Fig. 8 is that the signal of describing the telecommunication system of Fig. 1 receives the schematic diagram of handling level;

Fig. 9 describes the downgoing line of wireless communication system and the schematic diagram of uplink communication path;

Figure 10 is a schematic diagram of describing the structure of the down link signal of being launched by central terminal;

Figure 11 describes the subordinate sign indicating number sequence of user terminal is made phase-adjusted curve chart;

Figure 12 is the curve chart of being estimated by the signal quality that the receiver of user terminal is done;

Figure 13 is a schematic diagram of describing the content of the frame information signal in the down link signal;

Figure 14 is the tabulation figure that describes the expense insertion that the data flow of down link signal is done;

Figure 15 is the tabulation figure of the power control signal in expense (overhead) channel of down link signal;

Figure 16 is the tabulation figure of sign indicating number synchronizing signal of the overhead channel of down link signal;

Figure 17 is the transmitting power of every kind of operator scheme of radio telecommunications system and the curve chart of emission rate;

Figure 18 is the schematic diagram of operation of describing the Receiver And Transmitter of user terminal.

Embodiments of the present invention

Fig. 1 is the schematic diagram of the embodiment of radio telecommunications system.Radio telecommunications system comprises one or more coverages 12,14 and 16, wherein by each central terminal (CT) 10 (it is in relevant zone and set up radio link between the user terminal (ST) 20) each zone is served.The zone that is covered bycentral terminal 10 can change.For example, in the lower rural areas of user density, coverage 12 can covering radius reaches the zone of 15-20Km.Coverage 14 a possibility covering radius in the urban environment with highdensity user terminal 20 reach the zone of the 100m order of magnitude.In having the zone, suburbs of intermediate density user terminal, coverage 16 can covering radius reaches the zone of the 1Km order of magnitude.Be interpreted as, can select to meet desired this locality and require or actual user's density, local orographic condition etc., and be not limited to embodiment shown in Figure 1 by the zone that specialcentral terminal 10 covers.In addition, owing to (they are launched influence the distribution of signal) such as Antenna Design consideration, orographic factor, buildings, it needn't and generally not be circular making the overlay area.

Method by link 13,15 and 17 (for example, they engage with public switched telephone network (PSTN) 18) can be connected to each other the central terminal of each coverage 12,14 and 16.Link can comprise the conventional telecommunications technology, its utilization copper cash, optical cable, satellite, microwave etc.

The radio telecommunications system of Fig. 1 is to be provided at theuser terminal 20 on the fixed position in the coverage (for example, 12,14,16) and to be used for fixed microwave link between thecentral terminal 10 of that coverage for the basis.In preferred embodiment, eachuser terminal 20 is provided with the permanent fixation access link of leading to its central terminal 10.Yet, in another embodiment, can provide visit, thereby the number of users that can serve exceeds the current effectively quantity of telecommunication link based on request.

Fig. 2 illustrates the embodiment of the structure of theuser terminal 20 that is used for Fig. 1 telecommunication system.Fig. 2 comprises schematically illustrating of user house 22.User radio electric unit (CRU) 24 is installed on the user house.User radio electric unit 24 comprises plate aerial etc. 23.Be installed in the user radio electric unit on the user house or the position on montant, and with this direction, thereby the plate aerial in user radio electric unit 24 23 is in the face of wherein being provided with the direction 26 of the coveragecentral terminal 10 of user radio electric unit 24.

By drop wire 28, user radio electric unit 24 is linked to each other with power subsystem (PSU) in the user house.With power subsystem 30 be used for providing the local power supply of power supply to link to each other with network temination unit (NTU) 32 to user radio electric unit 24.By power subsystem 30, user radio electric unit 24 is linked to each other with network temination unit 32, and it links to each other with telecommunication apparatus (for example, one or more telephone sets 34, facsimile machine 36 and computer 38) in the user house.Shown in telecommunication apparatus be positioned at the unique user house.Yet, situation not necessarily like this becauseuser terminal 20 preferably supports single or the double joint line, therebyunique user terminal 20 can be supported two subscriber lines.Can also arrangeuser terminal 20 to support analog-and digital-telecommunications, for example, 16,32 or the analog communication of 64Kbits/sec or according to the digital communication of ISDN BRA standard.

Fig. 3 is the schematic diagram of embodiment of the central terminal of Fig. 1 telecommunication system.Common equipment frame 40 comprises a plurality ofequipment frames 42,44,46, and they are RF synthesizer and power amplifier frame (RFC) 42, power bay (PS) 44 and a plurality of (having four in this embodiment) modulator-demodulator frame (MS) 46.RF synthesizer frame 42 makes four modulator-demodulator frame 46 parallel work-flows.It is synthetic and amplify four power that transmit (each signal is from each modulator-demodulator frame in four modulator-demodulator framves), and amplifies and four paths of signal that shunting receives, thereby the signal that separates can pass through each modulator-demodulator frame.Power bay 44 links to each other with local power supply and provides fuse for each parts in the common equipment frame 40.Expansion between the two-way RF of being connectedsynthesizer frame 42 and the main central terminal antenna 52 (generally being mounted in the omnidirectional antenna on the central terminal bar 50).

By the point-to-point microwave link, thecentral terminal 10 of this embodiment is linked the position that forms public switchedtelephone network 18 interfaces (as shown in Figure 1).As mentioned above, can use the connection (for example, copper cash or optical cable) of other type thatcentral terminal 10 and public switchedtelephone network 18 are linked.In this embodiment, byline 47, the modulator-demodulator frame is linked to each other with microwave terminal (MT) 48.Microwave link 49 extends to the point-to-point microwave antenna 54 that is installed on thebar 50 frommicrowave terminal 48, to be connected with public switchedtelephone network 18 main frames.

PC, work station etc. can be used as site controller (SC) 56 in order to support central terminal 10.Site controller 56 can be linked to each other with each modulator-demodulator frame of central terminal 10 (for example, connecting 55) by RS232.Then,site controller 56 can provide support function (such as, the location of fault, warning and state, and the formation ofcentral terminal 10).Though available a plurality ofsites controller 56 forms network to support a plurality ofcentral terminals 10, the singlecentral terminal 10 ofsite controller 56 general supports.

Connect 55 another kind of form as the RS232 that extends tosite controller 56, availablely connect (such as, link 57 (in Fig. 3, representing) X.25) fromextender 228 to the data that the switching node 60 of unit manager (EM) 58 provides and replace with dashline.Unit manager 58 can be supported a plurality of distributedcentral terminals 10, is linked to each other with switching node 60 by distributedcentral terminal 10 shown in each connectionhandle.Unit manager 58 can be incorporated supervising the network to possible a large amount of central terminals 10 (for example, greatly to more than 1000 or 1000) into.Unit manager 58 be based uponpowerful work station 62 around, and can comprise that a plurality ofterminals 64 use for network engineers and control personnel.

Fig. 3 A illustrates the various piece of modulator-demodulator frame 46.Emission/reception RF unit (RFU-for example realizes on the plug-in unit in the modulator-demodulator frame) 66 is created on the modulated transmitting RF signal of middle power level, and recovers and amplify the base band RF signal that user terminal is used.RF unit 66 68 links to each other with simulation plug-in unit (AN), and described simulation plug-in unit carries out A-D/D-A conversion, baseband filtering and vector for transmitting from 15 of modulator-demodulator frame plug-in unit (MC) 70 and sues forpeace.Analogue unit 68 links to each other with a plurality of (generally being 1-8) modulator-demodulator plug-in unit 70.The modulator-demodulator plug-in unit carries out base band signal process for the signal that is transmitted into or accepts from user terminal 20.This comprises and carries out 1/2 speed convolutional encoding for transmitting and with CDMA sign indicating number * 16 expansions, and recovers, goes expansion and error correction synchronously for received signal.Each modulator-demodulator plug-inunit 70 in the present embodiment has two modulator-demodulators, and a user link (or two links) ofuser terminal 20 is led in each modulator-demodulator plug-in unit support.Then, each plug-in unit has two modulator-demodulators, and each modulator-demodulator frame has 8 modulator-demodulators, and each modulator-demodulator frame can be supported 16 possible user link.Yet, in order to contain redundancy, thereby when breaking down, in user's link, can substitute the modulator-demodulator frame, a modulator-demodulator frame 46 is preferably supported 15 user link.So, with the 16th modulator-demodulator plug-in unit as spare unit, can be when breaking down for one in other 15 modulator-demodulator framves with its place in circuit.Modulator-demodulator plug-inunit 70 links to each other with branch units (TU) 74, described branch units (for example terminates at line on the main frame of public switchedtelephone network 18, by the single line in the line 47), and the signaling of the phone information of 15 user terminals (by 15 modulator-demodulators separately in 16 modulator-demodulators) is led in processing at the most.

Aerogram betweencentral terminal 10 anduser terminal 20 can be operated under each frequency.Fig. 4 illustrates an example of available frequencies.In the present embodiment, radio telecommunications system trends towards operating in the 1.5-2.5GHz bandwidth.Particularly, present embodiment trends towards by F.701 (2025-2110MHz, the 2200-2290MHz) operation in the predetermined bandwidth of ITU-R (CCIR) standard.Fig. 4 illustrates the frequency that is used for fromuser terminal 20 tocentral terminal 10 uplink and is used for fromcentral terminal 10 touser terminal 20 downgoing line.It should be noted that 12 uplink and 12 downgoing line radio channels (frequency of each channel is 3.5MHz) are the center with 2155MHz.Interval between receive channel and send channel surpasses required minimum interval 70MHz.

In the present embodiment, as mentioned above, each modulator-demodulator frame is supported a frequency channels (that is, a uplink frequency adds the corresponding downstream line frequency).As to be described later, can support 15 user link at most on a frequency channels, like this, in the present embodiment, eachcentral terminal 10 can be supported 60 links, or 120 lines.

Generally speaking, the radio traffic extends in the zone that is covered by nearcentral terminal 10 from specific central terminal 10.For fear of the interference problem that (perhaps reducing at least) caused by neighboring region, 10 utilizations of any central terminal that provides limit the usable frequency of quantity.

Fig. 5 A illustrates a kind of cellular layout of frequency, to slow down the interference problem between adjacent central terminal 10.In the layout shown in Fig. 5 A, the hacures of sub-district 76 are represented the frequency configuration of sub-district (FS).By selecting three frequency configurations (for example, wherein: FS1=F1, F4, F7, F10; FS2=F2, F5, F8, F11; FS3=F3, F6, F9, F12), and do following arrangement, that is, the frequency configuration that abutting subdistrict need not be identical (for example, referring to the layout shown in Fig. 5 A) can provide the array of the omni cell of fixedly appointment, and it can avoid the interference between the adjacent cell.Set the transmitter power of eachcentral terminal 10, thereby emission is no more than the nearest sub-district of utilization same frequency.Then,central terminal 10 can be used in four frequencies in its sub-district to (being respectively applied for uplink and downgoing line), links to each other at each modulator-demodulator frame and each RF channel of central terminal 10 (channel frequency to).

Because each modulator-demodulator frame is supported a channel frequency (and each channel frequency is connected with 15 root user links) and four modulator-demodulator framves, so eachcentral terminal 10 is supported 60 root user links (that is 120 lines).Thereby 10 cell layout supports of Fig. 5 A reach 600 isdn links or 1200 artificial lines.Fig. 5 B illustrates cellular layout, and it adopts sectored cell to slow down the problem between the adjacent central terminal 10.Compare with Fig. 5 A, dissimilar hacures are represented different frequency configurations among Fig. 5 B.Shown in Fig. 5 A, Fig. 5 B represents that three frequency configurations (for example, wherein: FS1=F1, F4, F7, F10; FS2=F2, F5, F8, F11; FS3=F3, F6, F9, F12).Yet, in Fig. 5 B, by utilization subregion central terminal (SCT) 13 (it comprises threecentral terminals 10, and each sector S1, S2 and S3 have a central terminal, and suitably sector is all directly pointed in S1, S2 and S3 in the emission of each in three central terminals 10) to branch sector, sub-district.This makes the number of users of each sub-district increase by three times, still provides permanent fixedly visit eachuser terminal 20 simultaneously.

Use seven sub-district repeat patterns, thereby for the sub-district of under given frequency, operating, all available unique PN sign indicating number of all six adjacent cells of operation under same frequency.This prevents that adjacent cell from deciphering data once in a while.

As mentioned above, each channel frequency can be supported 15 user link.In the present embodiment, the signal by multiple connection utilization code division multiple access (CDMA) technology can obtain above-mentioned effect.Fig. 6 illustrates the schematic diagram of CDMA coding and decoding.

For CDMA signal, baseband signal are encoded, for example, the subscriber signal on every root user link is encoded into 160k code element/second baseband signal at the 80-80N place, wherein each code element is represented 2 data bit (referring to, the signal shown in 81).Then, expand these signals, the signal that has effective subcode rate of 2.56M code element/second under the 3.5MHz frequency with generation by each Walsh pseudo noise (PN) sign indicating number expanded function of utilization 82-82N with factor 16.Then, the signal on synthetic each user link and convert it to radio frequency (RF) to produce in order to a plurality of subscriber channel signals (for example, 85) from transmittingantenna 86 emissions.

During launching, transmit throughinterference source 88, it comprisesexternal disturbance 89 and from theinterference 90 of other channel.Correspondingly, whenreception antenna 91 received the CDMA signal, a plurality of subscriber channel distorted signals were as shown in 93.

For the signal that is used for given user link from a plurality of subscriber channels that receive is deciphered, identical pseudo noise (PN) sign indicating number (it is used for each user link signal is encoded) of Walsh correlator 94-94N utilization is used for the signal (for example, 95 shown in) of each baseband signal 96-96N that receives with extraction.It should be noted that the signal that receives comprises some residual noises.Yet utilization low pass filter and signal processing can filter undesired noise.

The key of CDMA is the application of orthogonal code, and its makes at one time launches under same frequency and receive a plurality of subscriber signals.In case utilization Walsh sign indicating number quadrature is isolated bit stream, the signal on each user link just can not interfere with each other.

The Walsh sign indicating number is one group of mathematical sequence with " orthogonalization " function.In other words, if multiply by any Walsh sign indicating number by other any Walsh sign indicating number, the result will be zero so.

Fig. 7 be explanation as the user terminal of the communication system of Fig. 1 in the schematic diagram handled grade of the signal emission of constructing.Also making structure at central terminal handles to carry out signal emission of equal value.In Fig. 7, make from one of a pair of telephone set analog signal deliver to morbid sound treatment circuit 104 through two-wire interface 102, and then encoded decoder 106 generations one digital signal, at 108 places the overhead channel that comprises control information is inserted this digital signal.By before the expander 116, handle the signal that obtains by convolution coder 110, by RW code generator 112 and PN code generator 114 Rademacher-Walsh sign indicating number and PN sign indicating number are added to expander 116 respectively.The signal that makes acquisition is by D-A converter 118.D-A converter 118 makes numeral sample be configured as analog waveform, and the base band power controlled stage is provided.Make signal modulated in modulator 122 then by low pass filter 120 backs.Modulated signal and the signal mixing that is produced by voltage controlled oscillator 126 from modulator 122,126 pairs of synthesizers 160 of this voltage controlled oscillator are reacted.The output of frequency mixer 128 was amplified in low noise amplifier 130 before passing through band pass filter 132.The output of band pass filter 132 was further amplified in another low noise amplifier 134 before leading to power control circuit.The output that makes power control circuit is launched from transmitting antenna 142 then by further amplifying in another low noise amplifier 138 before another band pass filter 140.

Fig. 8 be explanation as the user terminal of the communication system of Fig. 1 in the signal of constructing receive the schematic diagram of handling grade.Also make structure and receive processing to carry out signal of equal value at central terminal.In Fig. 8, make the signal that receives at reception antenna 150 places in low noise amplifier 154, be exaggerated before by band pass filter 152.The output that makes amplifier 154 then can 156 by another band pass filter before being amplified by another low noise amplifier 158.Make the output of amplifier 158 lead to frequency mixer 164 then, this output and the signal mixing that is produced by voltage controlled oscillator 162,162 pairs of synthesizers 160 of this voltage controlled oscillator are reacted there.Make the output of frequency mixer before leading to analog-digital converter 170, pass through demodulator 166 and low pass filter 168 then.Make the numeral output of A/D converter 170 lead to correlator 178 then, be applied to this correlator 187 by RW code generator 172 (corresponding to RW code generator 112) and PN code generator 174 (corresponding to PN code generator 114) the identical Rademacher-Walsh sign indicating number and the PN sign indicating number of use with emission the time respectively.The output of correlator is applied to Viterbi decoder 180.Then overhead extraction device 182 is delivered in the output of Viterbi decoder 180, be used to extract overhead channel information.To two-wire interface 190, the analog signal that obtains is led to telephone set 192 through selecting at this interface by coder-decoder 184 and hybrid circuit 188 in the output that makes overhead extraction device 182 then.

Atuser terminal 20 places, the place comprises the automatic gain controlled stage in the IF level.Draw control signal from the numerical portion of cdma receiver with the output of signal quality estimator (below will describe).

Fig. 9 is the downgoing line between central terminal 10 and theuser terminal 20 and the block diagram of uplink communication path.Set up a Down-Link Communications path from thetransmitter 200 ofcentral terminal 10 to the receiver 202 of user terminal 20.Set up a uplink communication path from thetransmitter 204 ofuser terminal 20 to thereceiver 206 of central terminal 10.In case inradio telecommunications system 1, set up downgoing line and uplink communication path, just can between a user ofdown link signal 212 and uplink signal 214 services, carry out telephone communicationfirst user 208 ofuser terminal 20 orsecond user 210 and by central terminal 10.Downlink signal 212 is received by the receiver 202 ofuser terminal 20 bytransmitter 200 emissions of central terminal 10.Uplink signal 214 is received by thereceiver 206 ofcentral terminal 10 bytransmitter 204 emissions of user terminal 20.Downlink signal 212 and uplink signal 214 are launched as the CDMA spread spectrum signal.

Receiver 206 in thecentral terminal 10 andtransmitter 200 are synchronous mutually with respect to time and phase place, and locate according to information boundary.For setting up the Down-Link Communications path, should make the receiver 202 ofuser terminal 20 synchronous with thetransmitter 200 of central terminal 10.By ondown link signal 212, finishing the drainage pattern function and the tracing mode function takes place synchronously.Originally, thetransmitter 200 transmitting downstream line signals 212 of central terminal 10.Figure 10 illustrates the content of down link signal 212.Downlink signal 212 comprises the codedsequence signal 216 for central terminal 10 with 218 combinations of frame information signal.Codedsequence signal 216 is combined by pseudo noise codedsignal 220 and Rademacher-Walsh coded signal 222.Though Figure 10 is specifically related to the composition of down link signal, uplink signal has identical composition.

By each receiver 202 operation of eachuser terminal 20 of singlecentral terminal 10 services as the identical ofcentral terminal 10 but the Pseudo-Random Noise Code that departs from.Each modulator-demodulator frame 46 in thecentral terminal 10 is supported a radio-frequency channel and 15user terminals 20, and each user terminal hasfirst user 208 and second user 210.Each modulator-demodulator frame 46 is selected one of 16 Rademacher-Walsh coded signals 222, and each Rademacher-Walsh codedsignal 222 is corresponding to a unique user terminal 20.Sospecific user terminal 20 will have the identical codedsequence signal 218 of thedown link signal 212 that a conduct propagates bycentral terminal 10 emissions and tospecific user terminal 20.

Receiver 202 places atuser terminal 20 receive down link signal 212.Receiver 202 is made comparisons its phase place and coded sequence and phase place and coded sequence in the codedsequence signal 216 of down link signal 212.Think that central terminal has the primary key sequence, and think that user terminal has subordinate sign indicating number sequence.Receiver is progressively regulated the phase place of its subordinate sign indicating number sequence with the coupling of identification with the primary key sequence, and makes the receiver 202 ofuser terminal 20 andtransmitter 200 homophases of central terminal 10.Because the path delay between central terminal 10 and theuser terminal 20, the subordinate sign indicating number sequence of receiver 202 and the primary key sequence oftransmitter 200 andcentral terminal 10 are not initial synchronously.Caused by the geographical separation betweenuser terminal 20 and thecentral terminal 10 and other environment and technical factors that influence wireless radio transmission this path delay.

The receiver 202 that Figure 11 describesuser terminal 20 how adjuster subordinate sign indicating number sequence is complementary with the primary key sequence with thetransmitter 200 of central terminal 10.Receiver 202 increases progressively the phase place of subordinate sign indicating number sequence in the whole length of the primary key sequence ofdown link signal 212, and determines the signal quality estimated value by the measurement of each increment variation of subordinate sign indicating number sequence phase being carried out the combined power of subordinate sign indicating number sequence and primary key sequence.According to the subcode cycle of 2.56 megahertzes, the length of primary key sequence is about 100 microseconds.During acquisition phase,, regulate the phase place of subordinate sign indicating number sequence with half subcode cycle for each incremental spacing.When receiver 202 identified a correlation peak (reaching a maximum in this place's combined power), receiver 202 had been finished first and has been caught transmission.Receiver 202 carries out second and catches transmission to confirm at the correlation peak place the peaked identification of combined power in whole sign indicating number sequence length.When identification correlation peak location in acquisition mode, determine that the approximate path betweenuser terminal 20 and thecentral terminal 10 postpones.

In case 202 places finish catching of down link signal at receiver, just carry out from the fine setting of sign indicating number sequence phase, in tracing mode, to keep the phase matched of subordinate sign indicating number sequence and primary key sequence.Fine setting is to change by the increment of the phase place of subordinate sign indicating number sequence being done ten a sixths subcode cycle to carry out.Measure in response to the combined power that receiver 202 is done, fine setting can be carried out along forward direction (just) or reverse (bearing).Receiver 202 monitors the primary key sequence continuously, and is synchronous to guarantee for Down-Link Communicationspath user terminal 20 andcentral terminal 10.

The combined power curve chart that Figure 12 is recorded by receiver 202 during acquisition mode and tracing mode.The maximum that occurs combined power at correlation peak 219 places of combined power curve.Be noted that not image pattern 12 such sharp outlines of peak value 219, and that its top may become is smooth, more as a flat-top.This is subordinate sign indicating number sequence and the primary key sequence homophase oftransmitter 200 and the point of coupling of receiver 202.Cause the measurement requirement of combined power value (it is departing from the appearance of peak value 219 places, pass) that subordinate sign indicating number sequence is made incremental adjustments.Set up a fine setting window between correlator point 221 and the slow correlator point 223 in morning.Morning correlator point 221 and late correlator put 223 places and make average power and measure.Since early correlator point 221 and late correlator point 223 be separated by a subcode cycle, the difference of the average power of correlator point 221 and slow correlator point 223 produces an error signal according to calculating early, controls fine setting to the subordinate code phase with this error signal.

For setting up the Down-Link Communications path, behindcentral terminal 10 primary key sequence capturings and initial tracking to the coded sequence signal in thedown link signal 212 216, receiver 202 enters the frame alignment pattern.Frame information in the frame information signal 218 of receiver 202 analysis down link signals 212 is with the starting point fordown link signal 212 identification frame position.

Because receiver 202 does not know that its that place in the data flow ofdown link signal 212 receives information, therefore in order to handle the information that receives from thetransmitter 200 ofcentral terminal 10, the starting points of receiver 202 necessary searching frame position.In case receiver 202 identifies the starting point of another frame position, just set up Down-Link Communications path from thetransmitter 200 ofcentral terminal 10 to the receiver 202 ofuser terminal 20.

Figure 13 illustrates the general content of frame information signal 218.For each information frame that transmits throughdown link signal 212, frame information signal 218 comprisesoverhead channel 224,first subscriber channel 226,second subscriber channel 228 and signaling channel 230.Overhead channel 224 carries the control signal that is used to set up and keep downgoing line and uplink communication path.First subscriber channel 226 is used to transmit traffic information to the first user 208.Second subscriber channel 228 is used to transmit traffic information to the second user 210.Signaling channel 230 provides the running of signaling information withsupervisory user terminal 20 call functions.In an information frame,overhead channel 224 occupies 16 kilobits per seconds, andfirst subscriber channel 226 occupies 64 kilobits per seconds, andsecond subscriber channel 228 occupies 64 kilobits per seconds, and signalingchannel 230 occupies 16 kilobits per seconds.

Figure 14 illustrates the data flow of howoverhead channel 224 being inserted down link signals 212.The data flow ofdown link signal 212 is divided into 20 bit subframes.Each 20 bit subframe has two ten bit section.First ten bit section comprises an overhead-bits, a signaling bit and eight user's bits.Second ten bit section comprises an overhead-bits, a signaling bit and eight second user's bits.In whole four milliseconds of information frames, repeat this 20 bit sub-frame formats.Like this, in the data flow ofdown link signal 212, frame information is just occupied by an overhead-bits every ten bit positions.

Overhead channel 224 comprises Eight characters joint field (Frame Aligning Word 232), sign indicatingnumber synchronizing signal 234,power control signal 236, operates and keepchannel signal 238 and four reserve bytes fields 242.Frame Aligning Word 232 is for the starting point of its corresponding information frame identification frame position.Code synchronism signal 234 provide thereceiver 206 of information withcontrol transmitter 204 ofuser terminal 20 andcentral terminal 10 synchronously.Power control signal 236 provides the transmitting power of information with thetransmitter 204 of control user terminal 20.Operation and keepchannel signal 238 and provide state information with respect to downgoing line and uplink communication path and a paths from central terminal to user terminal, on this paths, the shelf controller of modulator-demodulator gantry operation and the communication protocol between the modulator-demodulator have also been expanded.

In order to discern the starting point of two frame position in succession, the receiver 202 ofuser terminal 20 is searched for ten possible bit positions ofoverhead channel 224 and Frame Aligning Word 232 in the data flow of down link signal 212.Originally receiver 202 extracts first bit position to each ten bit section of frame information, to determine whether capturing overhead channel 224.If begin not identify Frame Aligning Word 232 yet at interval through one section preset time from extracting first bit position, receiver 202 will repeat this process to second bit position and the bit position thereafter of each ten bit section, until identifying Frame Aligning Word 232.The example of the Frame Aligning Word 232 that receiver 202 is sought is Binary Zeros 0010111.In case correct bit position produces Frame Aligning Word 232, receiver 202 just wants to discern the starting point of two frame position in succession.In case in response in the data flow ofdown link signal 212 in succession Frame Aligning Word 232 identification and after successfully identifying the starting point of two frame position in succession, just set up a Down-Link Communications path.

For follow-up information frame is discerned follow-up Frame Aligning Word 232, the bit position that receiver 202 continuous monitorings are suitable.If receiver 202 can't identify Frame Aligning Word 232 to three frames in succession, then receiver will be back to search procedure, and through each bit position of ten bit section circulation, until by identifying two Frame Aligning Words 232 in succession, identify two of frame position in succession starting point and rebulid frame alignment.The variation in the path delay between central terminal 10 and theuser terminal 20 may cause can't discern three Frame Aligning Words 232 insuccession.Interrupting transmitter 200 fromcentral terminal 10 to the Down-Link Communications path of the receiver 202 ofuser terminal 20, receiver 202 will be back to search procedure.

Can also check obtaining of Down-Link Communications path, lock onto the suitable part of suitable modulator-demodulator plug-inunit 70 to guarantee user terminal 20.These situations can occur, the modulator-demodulator plug-inunit 70 of promptly distributing tospecific user terminal 20 may be because multiple former thereby service is not provided.Specific user terminal 70 can be attempted picked up signal continuously, and this obtaining can be carried out with respect to the signal from a plug-in unit in other modulator-demodulator plug-inunit 70 in the central terminal 10.Thoughspecific user terminal 20 can not read signal from other modulator-demodulator plug-inunit 70,specific user terminal 20 still is locked on other modulator-demodulator plug-inunit 70, is not locked to suitable modulator-demodulator plug-in unit when it turns back to service state.Therefore, adopt and to obtain inspection technology and guarantee thatspecific user terminal 20 is not locked on the irrelevant modulator-demodulator plug-inunit 70 in thecentral terminal 10.

Obtain inspection technology and utilize reverse direction field 242 in the overhead channel 224.A reverse direction field 242 of Channel Identifier fields account.The Channel Identifier field comprises 8 bits-counter-rotating bit, three bit pseudo-random noise code identifiers and four bit Rademacher-Walsh sign indicating number identifiers, and its form is INV PPP RRRR.Three bit pseudo-random noise code identifiers corresponding tocentral terminal 10 with and the relevant sequence of relevant user terminal 20.Four bit Rademacher-Walsh sign indicating number identifiers corresponding to 15user terminals 20 in a relevant private code.The Channel Identifier field prevents thatuser terminal 20 from setting up with incorrectcentral terminal 10 and communicate by letter, prevents that alsouser terminal 20 from communicating by letter with correct central terminal 10 interior incorrect modulator-demodulator plug-inunits 70 foundation.

Receiver 202 also monitors the Channel Identifier field in theoverhead channel 224 when setting up the Down-Link Communications path by the sign of discerning two continuous Frame Aligning Words 232.Though frame alignment may take place, can not set up the Down-Link Communications path, on the Channel Identifier field unless suitable coupling is arranged.Because the Pseudo-Random Noise Code identifier and the Raddemacher-Walsh sign indicating number identifier of eachuser terminal 20 are constant, so receiver 202 should avoid a Channel Identifier field and Frame Aligning Word to obscure.Shown in italics, the counter-rotating bit changes state and interior the first and the 3rd bit pseudo-random noise code identifier of Channel Identifier field and the first and the 3rd bit Raddemacher-Walsh sign indicating number of every information frame.This has prevented from the Channel Identifier field taken as and has been Frame Aligning Word.

By suitable sign indicating number sequence phase synchronously and after frame alignment sets up fromcentral terminal 10 touser terminal 20 Down-Link Communications path,radio telecommunications system 1 is finished from thetransmitter 204 in theuser terminal 20 to central terminal the step of the uplink communication path of 10 interior receivers 206.At first,transmitter 204 outage is up to setting up the Down-Link Communications path, disturbs communicating by letter of central terminal and other user terminal to prevent transmitter.After setting up the Down-Link Communications path,, be the transmission power setting oftransmitter 204 minimum value according to via the order of thepower control channel 236 ofoverhead channel 224 from central terminal CT.Power control signal 236 controls transmitter the amount of 204 transmitting powers that produce, therebycentral terminal 10 receives the transmitting power with approximate identical value of eachuser terminal 20 of being served fromcentral terminal 10.

Ondown link signal 212, bytransmitter 200 transmittingpower control signal 236 in theoverhead channel 224 of frame information signal 218 of central terminal 10.The receiver 202 ofuser terminal 20 receives downlink signal 212, and therefrom extracts power control signal 236.Power control signal 236 is provided for thetransmitter 204 ofuser terminal 20, and the transmitting power oftransmitter 204 is carried out incremental adjustments.Central terminal 10 continues the transmitting power oftransmitter 204 is carried out incremental adjustments, in transmitting power drops onreceiver 206 determined required threshold ranges.At first, transmitting power is regulated, in transmitting power drops on required threshold range with coarse mode with one decibel of increment.When connectingtransmitter 204, by incremental adjustments, make the intensity of transmitting power progressively tilt to raise, to prevent to disturb communicating by letter of central terminal and other user terminal.

Figure 15 illustrates an example decoding scheme of power control signal 236.After the transmitting power oftransmitter 204 reaches required threshold range inuser terminal 20, the variation in path delay etc. between any variation that obtains for power fluctuation andcentral terminal 10 and theuser terminal 20, thereceivers 206 in thecentral terminal 10 continue the amount of monitoring from the transmitting power of transmitter 204.If transmitting power is fallen and is lower than or exceeds required threshold range, thencentral terminal 10 will be launched appropriate control signals 236, to increase or to reduce the transmitting power oftransmitter 204 as required.At this point, the fine tuning pattern that can have 0.1 decibel of increment is regulated, so that transmitting power is returned required threshold range.When downgoing line or the interruption of uplink communication path,central terminal 10 can comecommand transmitter 204 to return previous transmission power level, so that rebulid suitable communication path by recovering to be stored in the parameter inuser terminal 20 built-in storagies.

In order intactly to set up fromuser terminal 20 tocentral terminal 10 uplink communication path, thetransmitters 204 in theuser terminal 20 should be synchronous with thereceiver 206 in the central terminal 10.Sign indicatingnumber synchronizing signals 234 in theoverhead channel 224 ofcentral terminal 10 by frame information signal 218control transmitter 204 synchronous.The phase place of the subordinate sign indicating number sequence of sign indicatingnumber synchronizing signal 234 pairs oftransmitters 204 is carried out incremental adjustments, makes it to be complementary with the phase place of the primary key sequence of receiver 206.To carry out the synchronous oftransmitter 204 with the synchronous substantially the same mode of receiver 202.

Ondown link signal 212, thetransmitter 200 ofcentral terminal 10 is transmittercode synchronizing signal 234 on theoverhead channel 224 of frame information signal 218.The receiver 202 ofuser terminal 20 receives downlink signal 212, and therefrom extracts sign indicating number synchronizing signal 234.Sign indicatingnumber synchronizing signal 234 is provided fortransmitter 204, carries out incremental adjustments with the phase place to the subordinate sign indicating number sequence of transmitter 204.Central terminal 10 continues the phase place of the subordinate sign indicating number sequence oftransmitter 204 is continued incremental adjustments, up toreceiver 206 confirmation code and phase matched between the primary key sequence of the subordinate sign indicating number sequence oftransmitter 204 andcentral terminal 10.

When definite phase place and sign indicating number coupling, the synchronous execution of 206 pairs oftransmitters 204 of receiver and the locking phase of receiver 202 power measurement technology together.At first, the phase place of the subordinate sign indicating number sequence oftransmitter 204 is regulated, confirm the maximum power position of combined power of the subordinate sign indicating number sequence of primary key sequences andtransmitter 204 up toreceiver 206 with coarse mode withsubcode rate increment 1/2nd.

Fig. 16 illustrates an example decoding scheme of yard synchronizing signal 234.After the phase place and sign indicating number coupling of identification and checking subordinate sign indicating number sequence and primary key sequence, the phase change of the subordinate sign indicating number sequence of thetransmitter 204 that obtains for the path delay between central terminal 10 and theuser terminal 20 changes,receiver 206 continues monitoring uplink signal 214.Further regulate the phase place of the subordinate sign indicating number sequence oftransmitter 204 if desired, thencentral terminal 10 will be launched suitably sign indicatingnumber synchronizing signal 234, to increase or to reduce the phase place of the subordinate sign indicating number sequence oftransmitter 204 as required.At this point, can have the fine tuning pattern of subcode rate increment ten sixths, the phase place of the subordinate sign indicating number sequence oftransmitter 204 is regulated.Have no progeny in downgoing line or uplink,central terminal 10 can comecommand transmitter 204 to return previous subordinate sign indicating number sequence phase value, so that rebulid suitable communication path by recovering to be stored in the parameter inuser terminal 20 built-in storagies.

Realize transmitter 204 synchronously after,receiver 206 carries out frame alignment to set up the identical mode of frame alignment of being carried out during the downlink communication path with receiver 202 to uplink signal214.In case receiver 206 confirm two in succession Frame Aligning Word and obtain frame alignment, then set up the uplink communication path.When Down-Link Communications path and uplink communication path are all set up, transmission information betweenfirst user 208 orsecond user 210 that can begin and the user of being coupled tocentral terminal 10 atuser terminal 20.

Radio telecommunications system 1 can be adjusted to transmission power level and emission rate a setting of two settings that are used for three kinds of different system operation modes.System operation modes is to catch, prepare and converse.The adjusting of transmitting power and emission rate made to reduce interference with other user terminal, and it is minimized.Also realize improvement to the link establishment time.Transmission power level is decoded into and is thatpower control signal 236, emission rate are decoded into and is sign indicatingnumber synchronizing signal 234.

Can be the transmission power setting that is used fordown link signal 212 and uplink signal 214 0 decibel of specified high power value or reduce-12 decibels low-power value.The emission rate ofdown link signal 212 and uplink signal 214 can be set at the low rate of 10 kilobits per seconds or the two-forty of 160 kilobits per seconds.When switching to the two-forty of 160 kilobits per seconds, the user expands call volume and Overhead, thereby an information code element can cause launching 16 subcodes.16 subcodes are correlated with, thereby produce 12 decibels processing gain.When switching to the low rate of 10 kilobits per seconds, only expand Overhead, thereby an overhead symbol causes launching 256 subcodes.256 subcodes are correlated with, thereby produce 24 decibels processing gain.

Figure 17 illustrates transmitting power and the emission rate that is used for three kinds of system operation modes.In energized or when losing downgoing line or uplink communication path,radio telecommunications system 1 enters acquisition mode.In acquisition mode, the transmitting power of downgoing line and uplink transmitter and correlator processing gain are increased to maximum.Like this signal to noise ratio of correlator output place is increased to maximum, thereby increases the amplitude of correlation peak 219, to be more conducive to discern and reduce the danger of error capture.Owing in acquisition mode, only need Overhead, so emission rate is in the low rate value of 10 kilobits per seconds.

When obtaining downgoing line and uplink communication path,radio telecommunications system 1 enters run-up mode.In run-up mode, the transmitting power of downgoing line and uplink transmitter is reduced 12 decibels.Transmitting power reduce to reduce interference to other user terminal, and still keep synchronously.Emission rate remain on the low rate value allow on theoverhead channel 224 between central terminal 10 anduser terminal 20 exchange of control information.

Input or output when calling out when detecting, launch a message from initial terminal to the purpose terminal, this message represents need be used to launch the downgoing line and the uplink communication path of user's communication information.At this place,radio telecommunications system 1 enters call mode.In call mode, the transmitting power of downgoing line and uplink communication path all is increased to high power value, and its emission rate also is increased to the two-forty value of 160 kilobits per seconds, so that the information transmission between the initial sum purpose terminal.When detecting the calling termination, launch a message from terminating terminal to other terminal, this message no longer need to represent downgoing line and uplink communication path.At this place,radio telecommunications system 1 reenters run-up mode.All synchronous and frame alignment tracking of actuating code in run-up mode and call mode.

Figure 18 is the more detailed block diagram ofuser terminal 20 inner receivers 202 and transmitter 204.Receiver 202 receives downlink signal 212 atRF receiving interface 250 places.RF receiving interface 250 is separated into I and Q signal component to spread spectrum signal.RF receiving interface 250 carries out bandpass filtering to each I and Q signal component, and this is to be undertaken by removing half part of the approximate bandwidth (3.5 megahertz) that exceeds receiver 202.250 couples of I of RF receiving interface and Q signal component carry out low-pass filtering, to stop image frequency and to prevent signal aliasing (aliasing).I and Q signal component simulated-anddigital quantizer 252 places number format.The sample frequency of analogue-to-digital converters 252 is four times or 10.24 megahertzes in subcode cycle, and it has the resolution of eight bits.

Digital I and Q signal component are changed to the speed of 5.12 megahertzes by low-converter 254.Code generator anddespreader 256 carry out above-mentioned synchronization acquistion and following function, so that the Phase synchronization of the phase place of the Rademacher-Walsh of receiver 202 and pseudo-random noise code sequences and down link signal 212.Digital signal processor 258 is controlled the phase place of subordinate sign indicating number sequence bycode tracking device 260 and carrier track device 262.Automaticgain control unit 264 produces automatic gaining controling signal, with the gain of control RF receiving interface 250.Code generator anddespreader 256 produce the I and the Q frame information of 160 kilobytes per seconds, with under the control of nodesynchronous logic unit 268, are undertaken further synchronously by node sync cap 266.Node sync cap 266 determines whether to exchange I and Q channel by nodesynchronous logic unit 268, because they can four kinds of different modes receive.

270 couples of I of Viterbi decoder and Q channel provide the forward error correction, and produce the data-signal through 160 kilobytes per seconds of mistake correction after 71 symbol delay.By the frame alignment device mistake corrected signal is handled, andextractor 272 is determined frame alignment and is extractedpower control signal 236, sign indicating number synchronous 234 and operation and maintenance channel signal 238.Frame alignment device andextractor 272 also extract conversefirst subscriber channel 226 andsecond subscriber channel 228 of emission tofirst user 208 andsecond user 210, and the signaling channel of being handled by advanceddata link controller 274 andmicrocontroller 276 230.Frame alignment device andextractor 272 also provide alarm and mistake indication when detecting the frame alignment failure.Under the situation of loss of link, for the ease of rebuliding link,nonvolatile RAM 278 storages are used for passing through subsequently the system parameter message that arbiter 180inserts.Arbiter 280 also provides interface betweendigital signal processor 258 andmicrocontroller 276.

Along transmit direction,frame inserter 282 receives fromfirst user 208 and second user's 210 the first user's communication amount and the second user's communication amount, from signalingchannel 230 information of advanceddata link controller 274 and from the operation ofmicrocontroller 276 withkeep channel 238 information.The frame inserter produces frame information signal 218 toconvolution coder 284 handled uplink signals 214.Convolution coder 284 doubles the data rate of frame information signal 218, so that the forward error correction to be provided.Expander 286 is divided into the convolution coder signal of 320 kilobits per seconds the I and the Q signal of two 160 kilobits per seconds, and the system clock that is produced in response to the clock generator of being regulated by sign indicatingnumber synchronizing signal 234 290, the sequence spreading that is produced by code generator 288 carries out xor operation to these I and Q signal.Code generator 288 produces a function in 16 Rademacher-Walsh functions, this function and sign indicating number type (pattern) length be 256 and subcode speed be that the pseudo random sequence of 2.56 megahertzes is carried out xor operation.Pseudo random sequence should be complementary withcentral terminal 10, but can regulate this sequence under the control of software, to stop the signal from other frequency band or other sub-district reliably.

Expander 286 offers simulating transmittingmachine 290 to I and Q signal.290 pairs of RF emission interfaces of simulating transmittingmachine 292 produce the I and the Q signal of pulsation.In response to thepower control signal 236 that fromoverhead channel 224, extracts, produce transmitting power by at first setting up control voltage by digital-analog convertor.This control voltage is added to the power control input end of simulating transmittingmachine 290 and RF emission interface 292.In simulating transmittingmachine 290 andRF emission interface 292, all can obtain 35 decibels power control.RF emission interface 292 comprises step attenuator, and this decay provides 30 decibels of 2 db-loss levels that scope is interior.This attenuator is used for switching between height and low-power value.In energized, select maximum attenuation, the transmitting power oftransmitter 204 is reduced to minimum.

In a word, radio telecommunications system provides the communication of radiotelephone type for the user away from public switched telephone network (PSTN).Radio telecommunications system comprises central terminal, it by CDMA spread-spectrum radio frequency transmission with by a plurality of telex networks of subscriber terminal service.

Though, certain embodiments has been described here, should be appreciated that the present invention is not limited to these, can carry out many change or increases within the scope of the present invention to it.

Claims (108)

1, a kind of user terminal that is positioned at from the central terminal fixed range is characterized in that, comprises:

Can receive the expander of user's communication and control information, described expander can produce first signal of the described control information of expression with obtaining mode work, and described expander can produce the secondary signal of described control information of expression and user's communication with call mode work;

Be coupled to the transducer of expander, this transducer can convert one of described first signal and secondary signal to transmission signals, sends central terminal to.

2, user terminal as claimed in claim 1 is characterized in that, described expander produces described first signal with first rate, produces described secondary signal with second speed higher than described first rate.

3, user terminal as claimed in claim 1 is characterized in that, also comprises

Be coupled to the amplifier of transducer, can amplify described transmission signals; And

Be coupled to the antenna of amplifier, can launch described transmission signals.

4, user terminal as claimed in claim 1 is characterized in that, also comprises the amplifier that is coupled to transducer, can be with the described transmission signals of selecting from first power and second power less than described first power of a kind of power amplification.

5, user terminal as claimed in claim 1, it is characterized in that, also comprise the amplifier that is coupled to transducer, can be with the described transmission signals of from first power and second power, selecting of a kind of power amplification less than described first power, wherein said first power is corresponding to the obtaining mode of described user terminal.

6, user terminal as claimed in claim 1, it is characterized in that, also comprise the amplifier that is coupled to transducer, can be with the described transmission signals of selecting in first power and second power of a kind of power amplification less than described first power, wherein, described second power is corresponding to the obtaining mode of described user terminal.

7, user terminal as claimed in claim 1 is characterized in that, also comprises the telephone set that can produce user's communication.

8, a kind of method of carrying out radiotelephone communication between the fixed position is characterized in that, comprises

With first rate emission control information;

Detect the request of user's communication;

In response to the request of user's communication, with second speed emission control information and the user's communication greater than described first rate.

9, method as claimed in claim 8 is characterized in that, also is included in the following step that carries out before the described control information of emission:

Receive described control information with described first rate; And

Set up the received communication path.

10, method as claimed in claim 8 is characterized in that, also is included in the following step that carries out before the described control information of emission:

Receive described control information with the described first rate and first power;

Set up the received communication path; And

After setting up the received communication path, with the described first rate and the second power receiving control information, described second power is less than described first power.

11, method as claimed in claim 8 is characterized in that, the step of emission control information comprises:

With described first rate and the described control information of first power emission, set up the emission communication path; And

After setting up the emission communication path, with described first rate and the described control information of second power emission.

12, method as claimed in claim 8 is characterized in that, the step of launching described control information comprises described control information and sign indicating number combined sequence.

13, method as claimed in claim 8 is characterized in that, the step of emission control information comprises a control information and a sign indicating number sequence are made up, and wherein said sign indicating number sequence comprises the combination of Pseudo-Random Noise Code and orthogonal code.

14, method as claimed in claim 8 is characterized in that, described detection request step comprises the message that receives the request of indication user's communication from device far away.

15, method as claimed in claim 8 is characterized in that, the step of launching described control information and user's communication comprises described control information and user's communication and a sign indicating number sequence are made up.

16, method as claimed in claim 8, it is characterized in that, the step of launching described control information and user's communication comprises described control information and user's communication and a sign indicating number sequence is made up, and wherein said sign indicating number sequence comprises the combination of Pseudo-Random Noise Code and orthogonal code.

17, method as claimed in claim 8 is characterized in that, also is included in the following step that carries out after described control information of emission and the user's communication:

The indication that receipt of call finishes; And

Indication in response to described end of calling is launched described control information with described first rate.

18, method as claimed in claim 8 is characterized in that, also is included in the following step that carries out after described control information of emission and the user's communication:

The indication of emission end of calling; And

Launch described control information with described first rate.

19, a kind of central terminal is characterized in that, comprises:

A plurality of modulator-demodulator plug-in units, each described modulator-demodulator plug-in unit can receive and be arranged in from least one described user terminal of a plurality of user terminals of described central terminal fixed range relevant user's communication and control information, each described modulator-demodulator plug-in unit can be with obtaining mode work, produce first signal of expression control information, each modulator-demodulator plug-in unit can produce the secondary signal of described control information of expression and user's communication with call mode work; And

With the simulation plug-in unit that described modulator-demodulator plug-in unit is coupled, described simulation plug-in unit can produce the signal through summation of one of described first signal that expression produces by each described modulator-demodulator plug-in unit and secondary signal.

20, central terminal as claimed in claim 19 is characterized in that, also comprises the branch units that is coupled with described modulator-demodulator plug-in unit, and described branch units can transmit user's communication between modulator-demodulator plug-in unit and public switch telephone network.

21, central terminal as claimed in claim 19 is characterized in that, each described modulator-demodulator plug-in unit produces described first signal with first rate, produces described secondary signal with second speed that is higher than described first rate.

22, central terminal as claimed in claim 19 is characterized in that, also comprises:

Be coupled to the amplifier on the described simulation plug-in unit, can amplify described signal through summation; And

Be coupled to the antenna of described amplifier, can be to the described signal of described user terminal emission through summation.

23, central terminal as claimed in claim 19, it is characterized in that, producing describedly before the signal of summation, described simulation plug-in unit can amplify described first signal that each described modulator-demodulator plug-in unit produces with a kind of power of selecting and a signal in the secondary signal from first power and second power.

24, central terminal as claimed in claim 19, it is characterized in that, a kind of signal in described first signal that described simulation plug-in unit can produce with each described modulator-demodulator plug-in unit of a kind of power amplification of selecting from first power and second power less than described first power and the secondary signal, wherein said first power is corresponding to the obtaining mode of described user terminal.

25, central terminal as claimed in claim 19, it is characterized in that, a kind of signal in described first signal that described simulation plug-in unit can produce with each described modulator-demodulator plug-in unit of a kind of power amplification of selecting from first power and second power less than described first power and the secondary signal, wherein said second power is corresponding to the obtaining mode of described user terminal.

26, a kind ofly it is characterized in that this method comprises and is listed in the step that described central terminal place carries out down at central terminal with in the method for between a plurality of user terminals of described central terminal fixed range, carrying out radiotelephone communication:

Receive a plurality of signals relevant with described user terminal;

Expand each described signal to produce a plurality of spread signals;

Described spread signal is combined into composite signal; And

Launch described composite signal to described user terminal.

27, method as claimed in claim 26 is characterized in that, each described signal comprises user's communication and control information.

28, method as claimed in claim 26 is characterized in that, the step that receives a plurality of described signals comprises at least and receives a part of signal from public switch telephone network.

29, method as claimed in claim 26 is characterized in that, the step of expanding each described signal comprises:

If this signal indication control signal is then expanded each described signal with first rate; And

If this signal indication control signal and user's communication are then expanded each described signal with second speed that is higher than described first rate.

30, method as claimed in claim 29 is characterized in that, described first rate is corresponding to obtaining mode, and described second speed is corresponding to call mode.

31, method as claimed in claim 29 is characterized in that, also comprises with first power with less than one of second power of described first power to amplify each spread signal.

32, method as claimed in claim 29 is characterized in that, also comprises with first power with less than one of second power of described first power to amplify each spread signal, and described first power is corresponding to obtaining mode, and described second power is corresponding to run-up mode.

33, method as claimed in claim 29 is characterized in that, the step of expanding each described signal comprises a described signal and a sign indicating number sequence are made up.

34, method as claimed in claim 29 is characterized in that, the step of expanding each described signal comprises a described signal and a sign indicating number sequence are made up, and wherein the sign indicating number sequence comprises the combination of Pseudo-Random Noise Code and orthogonal code.

35, a kind of wireless receiver is characterized in that, comprises:

Antenna can receive the described down link signal that is positioned at from the ground far away of described wireless receiver fixed range device;

Be coupled to the transducer of described antenna, can convert described down link signal to digital form; And

The coupling car is to the despreader of described transducer, this despreader can be with first rate work under obtaining mode, control signal in the described down link signal is gone expansion, this despreader can go expansion to control signal in the described down link signal and user's communication with the second speed work under call mode.

36, wireless receiver as claimed in claim 35 is characterized in that, the described down link signal that receives at described despreader place comprises homophase and quadrature component.

37, wireless receiver as claimed in claim 35 is characterized in that, described control information comprises:

The sign indicating number synchronizing signal; And

Power control signal.

38, wireless receiver as claimed in claim 35, it is characterized in that, the described down link signal that receives at described despreader place comprises homophase and quadrature component, described wireless receiver also comprises the convolution decoder that is coupled to described despreader, and this convolution decoder is decoded into individual bit stream to the described homophase of described down link signal and quadrature component.

39, wireless receiver as claimed in claim 38 is characterized in that, also comprises the frame extractor that is coupled to described convolution decoder, and this frame extractor can extract power control signal and sign indicating number synchronizing signal from described individual bit stream.

40, wireless receiver as claimed in claim 38 is characterized in that, also comprises the frame extractor that is coupled to described convolution decoder, and this frame extractor can extract first subscriber channel and second subscriber channel from described individual bit stream.

41, wireless receiver as claimed in claim 35 is characterized in that, also comprises:

Be coupled to the digital signal processor of described despreader, can produce the system parameter message that circuit is rebuild; And

Be coupled to the memory of described digital signal processor, can store described system parameter message.

42, a kind of at central terminal with between the user terminal of described central terminal fixed range, carrying out method of wireless communication, it is characterized in that this method comprises:

Receive down link signal at the antenna place;

Described down link signal is converted to digital form;

Under obtaining mode, remove to expand described down link signal, to recover control information with first rate; And

Under call mode, remove the expanded downstream line signal, to recover control information and user's communication with second speed.

43, method as claimed in claim 42 is characterized in that, described down link signal comprises homophase and quadrature component.

44, method as claimed in claim 42 is characterized in that, described control information comprises:

The sign indicating number synchronizing signal; And

Power control signal.

45, method as claimed in claim 42 is characterized in that, described down link signal comprises homophase and quadrature component, and described method also comprises to be deciphered to produce the step of individual bit stream the described homophase of described down link signal and quadrature component.

46, method as claimed in claim 45 is characterized in that, also comprises the step of extracting power control signal and sign indicating number synchronizing signal from described individual bit stream.

47, method as claimed in claim 45 is characterized in that, also comprises the step of extracting first subscriber channel and second subscriber channel from described single special stream.

48, method as claimed in claim 42 is characterized in that, also comprises:

Power control signal and sign indicating number synchronizing signal are proposed from the described control information of described down link signal; And

First subscriber channel and second subscriber channel are proposed from the described user's communication of described down link signal.

49, method as claimed in claim 42 is characterized in that, also comprises:

Produce the system parameter message that circuit is rebuild; And

Described system parameter message is stored in the memory.

50, a kind of and be positioned at the user terminal that the central terminal from the user terminal fixed range communicates, it is characterized in that, comprise:

Expander, energy receiving information signal, described can also the combination described information signal and sign indicating number sequence signal to produce spread signal;

Receiver can receive sign indicating number synchronizing signal from central terminal with Radio Link; And

Be coupled to the code generator of described expander, can produce the sign indicating number sequence signal in response to described sign indicating number synchronizing signal, described sign indicating number synchronizing signal regulation is to the phase place adjustment of described sign indicating number sequence signal.

51, user terminal as claimed in claim 50 is characterized in that, described receiver comprises:

Despreader is used to receive the down link signal from described central terminal; And

Be coupled to the frame extractor of despreader, can from described down link signal, take out described sign indicating number synchronizing signal.

52, user terminal as claimed in claim 50 is characterized in that, the multiple possible described phase place adjustment of being stipulated by described sign indicating number synchronizing signal comprises:

The phase place coarse adjustment; With

The phase place fine tuning.

53, user terminal as claimed in claim 50 is characterized in that, the multiple possible described phase place adjustment of being stipulated by described sign indicating number synchronizing signal comprises:

Phase place in advance; With

Phase delay.

54, user terminal as claimed in claim 50 is characterized in that, the multiple possible described phase place adjustment of being stipulated by described sign indicating number synchronizing signal comprises:

Phase place slightly shifts to an earlier date;

Phase place carefully shifts to an earlier date;

The phase place coarse delay; And

Phase place carefully postpones.

55, user terminal as claimed in claim 50 is characterized in that, described phase place adjustment comprises the pre-phase place adjustment in the memory that is stored in described user terminal

56, a kind ofly it is characterized in that described method comprises and is listed in the step that described user terminal place carries out down at user terminal and in the method that between the central terminal of described user terminal fixed range, communicates:

Receive the information signal relevant with the subscriber channel of described user terminal;

With the sign indicating number synchronizing signal of Radio Link reception from described central terminal;

Produce the sign indicating number sequence signal in response to described sign indicating number synchronizing signal, described sign indicating number synchronizing signal regulation is to the phase place adjustment of described sign indicating number sequence signal; And

Described information signal and described sign indicating number synchronizing signal are made up to produce spread signal.

57, method as claimed in claim 56 is characterized in that, reception also comprises from the step of the described sign indicating number synchronizing signal of described central terminal:

Reception is from the down link signal of described central terminal;

Remove to expand described down link signal, remove spread signal with generation; And

Go the spread signal to extract described sign indicating number synchronizing signal from described.

58, method as claimed in claim 56 is characterized in that, the multiple possible described phase place adjustment of being stipulated by described sign indicating number synchronizing signal comprises:

The phase place coarse adjustment; With

The phase place fine tuning.

59, method as claimed in claim 56 is characterized in that, the multiple possible described phase place adjustment of being stipulated by described sign indicating number synchronizing signal comprises:

Phase place in advance; With

Phase delay.

60, method as claimed in claim 56 is characterized in that, the multiple possible described phase place adjustment of being stipulated by described sign indicating number synchronizing signal comprises:

Phase place slightly shifts to an earlier date;

Phase place carefully shifts to an earlier date;

The phase place coarse delay; And

Phase place carefully postpones.

61, method as claimed in claim 56 is characterized in that, described phase place adjustment comprises the pre-phase place adjustment in the memory that is stored in described user terminal

62, a kind of user terminal of communicating by letter with the central terminal that is positioned at the user terminal fixed range is characterized in that described user terminal comprises:

Expander, the energy receiving information signal, described expander can also be made up an information signal and a sign indicating number sequence signal to produce spread signal;

Receiver can receive power control signal from central terminal with Radio Link; And

Be coupled to the transmitter of described expander, can receive described spread signal, this transmitter can also amplify described spread signal in response to described power control signal, and described power control signal regulation is to the power adjustment of described spread signal.

63, user terminal as claimed in claim 62 is characterized in that, described receiver can also receive sign indicating number synchronizing signal from described central terminal with Radio Link; This user terminal also comprises the code generator that is coupled to described expander, can produce the sign indicating number sequence signal in response to described sign indicating number synchronizing signal, and described sign indicating number synchronizing signal regulation is to the phase place adjustment of described sign indicating number sequence signal.

64, user terminal as claimed in claim 62 is characterized in that, described receiver comprises:

Despreader can receive the down link signal from described central terminal; And

Be coupled to the frame extractor of described despreader, can from described down link signal, extract power control signal.

65, user terminal as claimed in claim 62 is characterized in that, the multiple possible described power adjustment of being stipulated by described power control signal comprises:

The power coarse adjustment; With

The power fine tuning.

66, user terminal as claimed in claim 62 is characterized in that, the multiple possible described power adjustment of being stipulated by described power control signal comprises:

Increase power; With

Reduce power.

67, user terminal as claimed in claim 62 is characterized in that, the multiple possible described power adjustment of being stipulated by described power control signal comprises:

Power slightly increases;

Power carefully increases;

Power slightly reduces; And

Power carefully reduces.

68, user terminal as claimed in claim 62 is characterized in that, described power adjustment comprises the minimum power output of resetting.

69, user terminal as claimed in claim 62 is characterized in that, described power adjustment comprises rated power mode is set.

70, a kind of user terminal and between the central terminal of distance user terminal fixed range method for communicating, it is characterized in that this method comprises:

Receive the information signal relevant with the subscriber channel of described user terminal,

Described information signal and the combination of sign indicating number sequence signal, to produce spread signal;

With the power control signal of Radio Link reception from central terminal; And

Amplify described spread signal in response to described power control signal, described power control signal regulation is to the power adjustment of described spread signal.

As the described method of claim 70, it is characterized in that 71, also comprise with the sign indicating number synchronizing signal of Radio Link reception from described central terminal, described sign indicating number synchronizing signal regulation is to the phase place adjustment of described sign indicating number sequence signal.

72, as the described method of claim 70, it is characterized in that, also comprise:

Reception is from the down link signal of described central terminal;

Remove to expand described down link signal and remove spread signal with generation; And

Remove to extract the spread signal power control signal from described.

As the described method of claim 70, it is characterized in that 73, the multiple possible described power adjustment of being stipulated by described power control signal comprises:

The power coarse adjustment; With

The power fine tuning.

As the described method of claim 70, it is characterized in that 74, the multiple possible described power adjustment of being stipulated by described power control signal comprises:

Increase power; With

Reduce power.

75, as the described method of claim 70, it is characterized in that, comprise by the multiple possible described power adjustment of described power control signal number regulation:

Power slightly increases;

Power carefully increases;

Power slightly reduces; And

Power carefully reduces.

76, a kind of user terminal of communicating by letter with central terminal is characterized in that, comprises:

Despreader, can receive down link signal from described central terminal, this despreader can also be under obtaining mode goes to expand control information in the described down link signal with first rate, removes to expand control information and user's communication in the described down link signal with second speed under call mode;

Be coupled to the frame extractor of despreader, this frame extractor can be from remove the expanded downstream line signal code fetch synchronizing signal;

Code generator can produce the sign indicating number sequence signal in response to the phase place adjustment of stipulating in the described sign indicating number synchronizing signal; And

Be coupled to the expander of described code generator, this expander can receive the information signal relevant with the subscriber channel of described user terminal, can also be made up described information signal and described sign indicating number sequence signal, be produced uplink signal, be transmitted to described central terminal.

As the described user terminal of claim 76, it is characterized in that 77, the multiple possible described phase place adjustment of being stipulated by described sign indicating number synchronizing signal comprises:

The phase place coarse adjustment; And

The phase place fine tuning.

As the described user terminal of claim 76, it is characterized in that 78, the multiple possible described phase place adjustment of being stipulated by described sign indicating number synchronizing signal comprises:

Phase place in advance; And

Phase delay.

As the described user terminal of claim 76, it is characterized in that 79, the multiple possible described phase place adjustment of being indicated by described sign indicating number synchronizing signal comprises:

Phase place slightly shifts to an earlier date;

Phase place carefully shifts to an earlier date;

The phase place coarse delay; And

Phase place carefully postpones.

As the described user terminal of claim 76, it is characterized in that 80, described phase place adjustment comprises the pre-phase place adjustment that is stored in the memory.

81, as the described user terminal of claim 76, it is characterized in that, described down link signal comprises homophase and quadrature component, this user terminal also comprises the convolution decoder that is coupled to described despreader, this convolution decoder can be decoded into individual bit stream to the described homophase of described down link signal and quadrature phase component, to send the frame extractor to.

As the described user terminal of claim 76, it is characterized in that 82, described frame extractor extracts first subscriber channel and second subscriber channel from described down link signal.

83, as the described user terminal of claim 76, it is characterized in that, also comprise:

Be coupled to the digital signal processor of described despreader, can produce the system parameter message that circuit is rebuild; And

The coupling car can be stored described system parameter message to the memory of described digital signal processor.

84, a kind ofly it is characterized in that, comprise at user terminal and in method for communicating between the central terminal of described user terminal fixed range:

Reception is from the down link signal of described central terminal;

Under obtaining mode, remove to expand the described down link signal of expression control information with first rate;

Under call mode, remove to expand the described down link signal of expression control information and user's communication with second speed;

From remove the expanded downstream line signal, extract the sign indicating number synchronizing signal;

Reception is from the information signal of the subscriber channel relevant with described user terminal;

Produce the sign indicating number sequence signal in response to the phase place adjustment of in described sign indicating number synchronizing signal, stipulating; And

Described information signal and the combination of described sign indicating number sequence signal, produce uplink signal, be transmitted to described central terminal.

As the described method of claim 84, it is characterized in that 85, the multiple possible described phase place adjustment of being stipulated by described sign indicating number synchronizing signal comprises:

The phase place coarse adjustment; And

The phase place fine tuning.

As the described method of claim 84, it is characterized in that 86, the multiple possible described phase place adjustment of being stipulated by described sign indicating number synchronizing signal comprises:

Phase place in advance; And

Phase delay.

As the described method of claim 84, it is characterized in that 87, the multiple possible described phase place adjustment of being stipulated by described sign indicating number synchronizing signal comprises:

Phase place slightly shifts to an earlier date;

Phase place carefully shifts to an earlier date;

The phase place coarse delay; And

Phase place carefully postpones.

As the described method of claim 84, it is characterized in that 88, described down link signal comprises homophase and quadrature component, this method also is included in before the described extraction step step that the homophase of down link signal and quadrature phase component is decoded into single-bit stream.

89, as the described method of claim 84, it is characterized in that, also comprise and from described down link signal, take out first subscriber channel and the second subscriber channel step.

90, as the described method of claim 84, it is characterized in that, also comprise:

Produce the system parameter message that circuit is rebuild; And

Described system parameter message is stored in the memory.

91, a kind of user terminal of communicating by letter with central terminal is characterized in that, comprises

Reception antenna can receive the down link signal from described central terminal;

Be coupled to the receiving converter of described reception antenna, can convert described down link signal to digital form;

Be coupled to the despreader of described receiving converter, this despreader can be under obtaining mode goes to expand control information in the described down link signal with first rate, can be under call mode removes to expand control information and user's communication in the described down link signal with second speed;

Be coupled to the frame extractor of described despreader, this frame extractor can extract power control signal and sign indicating number synchronizing signal from remove the expanded downstream line signal;

Code generator can produce the sign indicating number sequence signal in response to the phase place adjustment of stipulating in described sign indicating number synchronizing signal;

Be coupled to the expander of described code generator, this expander can receive the information signal related with the subscriber channel of described user terminal, and this expander can also be made up described information signal and described sign indicating number sequence signal, produces down link signal;

Be coupled to the transmitter of described expander, this emission function receives uplink signal, and this transmitter can also amplify described uplink signal in response to the power adjustment of stipulating in the described power control signal; And

Be coupled to the transmitting antenna of described transmitter, can be to the described uplink signal of central terminal emission through amplifying.

As the described user terminal of claim 91, it is characterized in that 92, the multiple possible described phase place adjustment of being stipulated by described sign indicating number synchronizing signal comprises:

The phase place coarse adjustment; And

The phase place fine tuning.

As the described user terminal of claim 91, it is characterized in that 93, the multiple possible described phase place adjustment of being stipulated by described sign indicating number synchronizing signal comprises:

Phase place slightly shifts to an earlier date;

Phase place carefully shifts to an earlier date;

The phase place coarse delay; And

Phase place carefully postpones.

As the described user terminal of claim 91, it is characterized in that 94, the multiple possible described power adjustment of being stipulated by described power control signal comprises:

The power coarse adjustment; And

The power fine tuning.

As the described user terminal of claim 91, it is characterized in that 95, the multiple possible described power adjustment of being stipulated by described power control signal comprises:

Power slightly increases;

Power carefully increases;

Power slightly reduces; And

Power carefully reduces,

96, as the described user terminal of claim 91, it is characterized in that,

Multiple possible described phase place adjustment by described sign indicating number synchronizing signal regulation comprises phase place coarse adjustment and phase place fine tuning;

Multiple possible described power adjustment by described power control signal regulation comprises power coarse adjustment and power fine tuning.

97, as the described user terminal of claim 91, it is characterized in that,

By the multiple possible described phase place adjustment of described sign indicating number synchronizing signal regulation comprise that phase place slightly shifts to an earlier date, phase place carefully shifts to an earlier date, phase place coarse delay and phase place carefully postpone;

Comprise by the multiple possible described power adjustment of described power control signal regulation that power slightly increases, power carefully increases, power slightly reduces carefully to reduce with power.

98, as the described user terminal of claim 91, it is characterized in that, also comprise the step attenuator that is coupled to described transmitter, this step attenuator can provide low transmitted power level and high transmit power level for described user terminal.

99, a kind of between user terminal and central terminal method for communicating, it is characterized in that this method comprises and is listed in down the step that described user terminal place carries out:

Reception is from the down link signal of described central terminal;

Described down link signal is converted to digital form;

Under obtaining mode, go to expand control information in the described down link signal with first rate,

Under call mode, remove to expand control information and user's communication in the described down link signal with second speed;

Take-off output control signal and sign indicating number synchronizing signal from remove the expanded downstream line signal;

Receive the information signal relevant with the subscriber channel of described user terminal;

Produce the sign indicating number sequence signal in response to the phase place adjustment of stipulating in the described sign indicating number synchronizing signal;

Described information signal and described sign indicating number sequence signal are made up, produced down link signal;

Amplify uplink signal in response to the power adjustment of in described power control signal, stipulating; And

To the uplink signal of central terminal emission through amplifying.

100, as the described method of claim 99, it is characterized in that, also comprise the step of the described uplink signal of decay, think that described user terminal provides low transmitted power level and high transmit power level through amplifying.

101, as the described method of claim 99, it is characterized in that, the step that also comprises the described uplink signal of decay through amplifying, think that described user terminal provides low transmitted power level and high transmit power level, wherein said low transmitted power level is corresponding to run-up mode, and described high transmit power level is corresponding to call mode.

As the described method of claim 99, it is characterized in that 102, the multiple possible described phase place adjustment of being stipulated by described sign indicating number synchronizing signal comprises:

Phase place slightly shifts to an earlier date;

Phase place carefully shifts to an earlier date;

The phase place coarse delay; And

Phase place carefully postpones.

As the described method of claim 99, it is characterized in that 103, the multiple possible described power adjustment of being stipulated by described power control signal comprises:

Power slightly increases;

Power carefully increases;

Power slightly reduces; And

Power carefully reduces,

104, as the described method of claim 99, it is characterized in that,

Multiple possible described phase place adjustment by described sign indicating number synchronizing signal regulation comprises phase place coarse adjustment and phase place fine tuning;

Multiple possible described power adjustment by described power control signal regulation comprises power coarse adjustment and power fine tuning.

105, as the described method of claim 99, it is characterized in that,

By the multiple possible described phase place adjustment of described sign indicating number synchronizing signal regulation comprise that phase place slightly shifts to an earlier date, phase place carefully shifts to an earlier date, phase place coarse delay and phase place carefully postpone;

Comprise by the multiple possible described power adjustment of described power control signal regulation that power slightly increases, power carefully increases, power slightly reduces carefully to reduce with power.

As the described method of claim 99, it is characterized in that 106, described down link signal also comprises homophase and quadrature component, this method also comprises the step that the described homophase of described down link signal and quadrature component is decoded into individual bit stream.

107, as the described method of claim 99, it is characterized in that, also comprise the step of from remove the expanded downstream line signal, extracting first subscriber channel and second subscriber channel.

108, as the described method of claim 99, it is characterized in that, also comprise:

Produce the system parameter message that circuit is rebuild; And described system parameter message is stored in the memory of user terminal.

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