CN101110621A - Method and system for antenna selection algorithm at the transmitter - Google Patents

Abstract

Aspects of a method and system for an antenna selection algorithm at the transmitter are presented. Aspects of a system for joint antenna selection may include a receiving mobile terminal that enables reception of a plurality of sounding frames via a plurality of receiving antennas. A processor may enable mapping of one of the plurality of receiving antennas to one of a plurality of received radio frequency (RF) chain signals based on the reception of the plurality of sounding frames. The receiving mobile terminal may enable transmission of antenna selection feedback information computed based on the reception of the plurality of sounding frames.

Description

In wireless communication system, transmit the system and method for information

Technical field

The present invention relates to radio communication, more particularly, relate to the system and method for the Antenna Selection Algorithem on a kind of reflector.

Background technology

Multiple-input and multiple-output (MIMO) system can utilize a plurality of transmission antennas transmit signals, and/or utilizes a plurality of reception antennas to come the wireless communication system of received signal.Communication between the mimo system can be based on the standard from Institute of Electrical and Electric Engineers (IEEE).The mimo system of received signal Y can come calculating channel estimated value matrix H according to received signal.This signal comprises the information that is generated by a plurality of information sources.Each such information source can be described as spatial data (spatial stream).

The MIMO reflector makes up spatial data with generation or a plurality of with the RF link that is launched.One group can be used as signal vector X with the RF link that is launched and launches simultaneously.When emission signal vector X, the emission mimo system can utilize a plurality of transmitting antennas.When receiving corresponding signal vector Y, receive mimo system and can utilize a plurality of reception antennas.

When the quantity of the RF link that will be launched was less than the quantity of transmitting antenna on the MIMO reflector, the RF link can be launched simultaneously by a plurality of transmitting antennas.This technology is known as transmit diversity.When utilizing transmit diversity, the MIMO reflector can by each transmitting antenna distribute or shine upon each with the RF link that is launched to launch.Similarly, when the quantity of received RF link was less than the quantity of reception antenna, the MIMO receiver can utilize receive diversity.When utilizing receive diversity, the RF link assignment that the MIMO receiver can be received with each or be mapped on each reception antenna.

It line options be can make the MIMO reflector with each RF link maps to each transmitting antenna, and/or can make the MIMO receiver with the program of each RF link maps to each reception antenna.In traditional mimo system, the antenna option program of MIMO reflector can make transmission antennas transmit explore frame (sounding frame) sequence, and this explore frame can make the MIMO receiver transmit a day line options feedback information.Based on this day line options feedback information, the MIMO reflector can with each with the RF link maps that is launched in the MIMO reflector on each transmitting antenna.

The limitation that exists in traditional antenna option program is that the explore frame sequence that is launched quantitatively may be very big.For example, in the antenna option program of reflector, each combination of transmitting antenna is all with the emission detection frame, and it is a plurality of with the RF link that is launched that each combination of transmitting antenna is used in the MIMO reflector synchronized transmissions.

After antenna is finished selection in the reflector program, in the receiver program, carry out a day line options thereupon.In the traditional antenna of receiver program was selected, the MIMO receiver can be to MIMO reflector emission request, with explore frame.In response, MIMO reflector emission detection frame repeatedly.Can utilize specific transmitting antenna or specific transmission antenna group to come the repeat its transmission explore frame.The MIMO receiver can utilize variable reception antenna, and/or variable reception antenna group receives each explore frame.Based on utilizing the received a series of explore frames of variable reception antenna, the RF link maps that the MIMO receiver can be received with each is in the MIMO receiver on each reception antenna.

The limitation of traditional antenna option program is exactly that the explore frame sequence that is launched quantitatively may be very big.For example, in the antenna option program of reflector, each combination of transmitting antenna is all with the emission detection frame, and each combined detection frame of transmitting antenna is used in synchronized transmissions or a plurality of with the RF link that is launched in the MIMO reflector.Similarly, in the antenna option program of receiver, each of reception antenna makes up all with the emission detection frame,, each combination of transmitting antenna is used in the MIMO receiver and receives synchronously or a plurality of received RF link.In the antenna option program of the antenna option program of reflector and receiver, the quantity of the explore frame of being launched will equal the product (product) of above-mentioned explore frame quantity of being launched at least in each independent antenna selection course.The present invention that said system and the application's further part are introduced in conjunction with the accompanying drawings compares, and existing and limitation and defective conventional method are conspicuous for the person of ordinary skill of the art.

Summary of the invention

The invention provides a kind of method and system that in reflector, carries out Antenna Selection Algorithem, carried out representing fully and describing in conjunction with at least one width of cloth accompanying drawing, and in the right request, obtained more complete elaboration.

According to aspects of the present invention, provide a kind of method that transmits information in wireless communication system, described method comprises:

Receive a plurality of explore frames by a plurality of reception antennas;

Based on the described a plurality of explore frames that received, with one in described a plurality of reception antennas one of being mapped in a plurality of received less radio-frequency (RF) link signals;

Sky line options feedback information and/or channel condition information that emission calculates according to the described a plurality of explore frames that received.

Preferably, described a plurality of explore frame comprises the explore frame sequence.

Preferably, this method further comprises, before receiving the described explore frame sequence of at least a portion, sends the request that is used to start the antenna option program.

Preferably, described request comprise repeat the indication.

Preferably, this method further comprises according to the described decision that repeats to indicate in the described a plurality of explore frames that received, repeats the explore frame in the described explore frame sequence.

Preferably, this method further comprises the different reception antenna combination of configuration from described a plurality of reception antennas, is used to receive each described repetition explore frame.

Preferably, this method further comprises, is at least one the calculating phase deviation difference in described a plurality of explore frames that received.

Preferably, this method further comprises according to described at least calculated phase deviation difference, described a plurality of reception antenna and at least reflector index (index) calculate channel guess value matrix at least, wherein the reflector index is used for launching at least one transmitting antenna of described a plurality of explore frame corresponding at least one at least, as being determined according to the order of the explore frame reception in described a plurality of explore frames.Preferably, this method further comprises, based on described at least one channel guess value matrix that has calculated, generates the mapping from described a plurality of reception antennas to described a plurality of RF links that receive.

Preferably, this method further comprises, based on described at least one channel guess value matrix that has calculated, generates described sky line options feedback information and/or described channel condition information.

According to aspects of the present invention, provide a kind of system that in wireless communication system, transmits information, comprising:

At least one can receive the circuit of a plurality of explore frames by a plurality of reception antennas;

At least one processor is used for according to the described reception of described a plurality of explore frames one of described a plurality of reception antennas being mapped in a plurality of received less radio-frequency (RF) link signals one; With

Described at least one circuit is used to launch sky line options feedback information and/or the channel condition information that described reception calculated according to described a plurality of explore frames.

Preferably, described a plurality of explore frame comprises the explore frame sequence.

Preferably, described at least one circuit is used for sending the request that is used to start the antenna option program before receiving at least a portion explore frame.

Preferably, described request comprise repeat the indication.

Preferably, described processor is used for the described decision that repeats to indicate according to the described a plurality of explore frames that received, repeats the explore frame in the described explore frame sequence.

Preferably, described processor can dispose different reception antenna combinations from described a plurality of reception antennas, be used to receive each described repetition explore frame.

Preferably, described processor is at least one the calculating phase deviation difference in the described explore frame sequence that has received;

Preferably, described processor is according to described at least calculated phase deviation difference, described a plurality of reception antenna and at least reflector index (index) calculate at least one channel guess value matrix, wherein at least one reflector index is used for launching at least one transmitting antenna of described a plurality of explore frames corresponding at least one, as being determined according to the order of the explore frame reception in described a plurality of explore frames.

Preferably, described processor can generate the mapping from described a plurality of reception antennas to described a plurality of RF links that receive based on described at least one channel guess value matrix that has calculated.

Preferably, described processor can generate described sky line options feedback information and/or described channel condition information based on described at least one channel guess value matrix that has calculated.

Various advantage of the present invention, purpose and character of innovation, and the detail of embodiment will be understood from following description and accompanying drawing more fully.

Description of drawings

The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:

Fig. 1 is the structure chart of the typical radio data communication system that can be used in combination with the embodiment of the invention;

Fig. 2 is the structure chart of the typical radio transceiver system that can be used in combination with the embodiment of the invention;

Fig. 3 is the schematic diagram of the sky line options feedback that can be used in combination with the embodiment of the invention;

Fig. 4 is the schematic diagram that the wave beam that can be used in combination with the embodiment of the invention forms;

Fig. 5 is the schematic diagram that carries out the frame transform of day line options according to an embodiment of the invention in reflector;

Fig. 6 is the schematic diagram according to the frame transform that carries out the joint antenna selection in reflector and receiver of one embodiment of the invention;

Fig. 7 is the flow chart of steps of carrying out day line options in reflector according to one embodiment of the invention;

Fig. 8 is the flow chart of steps that joint antenna is selected of carrying out according to one embodiment of the invention.

Embodiment

The present invention relates to the method and system of the Antenna Selection Algorithem in the reflector.According to aspects of the present invention, the MIMO reflector can be transmitted into the sequence of explore frame on the MIMO receiver.Based on the sequence of received explore frame, the MIMO receiver is transmitted into sky line options feedback information and/or channel condition information (CSI) on the MIMO reflector.The MIMO reflector can utilize day line options feedback information or CSI to determine how to come to transmit for a plurality of RF links by a plurality of transmitting antennas.

According to a further aspect in the invention, MIMO reflector and MIMO receiver can switching frame carry out a day line options to unite in antenna training sequence (antenna training sequence).The MIMO receiver can be selected request to MIMO reflector transmit receive antenna.The MIMO reflector can be to MIMO receiver emission detection frame sequence.Based on received explore frame sequence, the MIMO receiver distributes antenna on the MIMO receiver.But the MIMO receiver also emitting antenna selecting feedback information and/or CSI to the MIMO reflector.MIMO reflector utilization sky line options feedback information and/or CSI transmit from a plurality of RF links by a plurality of transmitting antennas.

In various embodiments of the present invention, send to the feedback information of emission side's portable terminal emission portable terminal from recipient's portable terminal mobile terminal receive, can comprise day a line options index or a CSI.This day the line options index or CSI be used in and determine day line options in the emission side emission portable terminal and/or carry out wave beam to form.

According to aspect in addition of the present invention, the explore frame that exchanges in the antenna training sequence can make the dependent phase information of MIMO reflector and/or MIMO receiver utilization about explore frame, and this explore frame is by a plurality of transmitting antenna synchronized transmissions.In various embodiments of the present invention, when comparing with traditional antenna training program, explore frame can utilize dependent phase information to reduce the quantity of the explore frame of launching in the antenna sequence.

Fig. 1 is the structure chart of the typical radio data communication system that can be used in combination with the embodiment of the invention.Referring to Fig. 1, shown compartment system (DS) 110, extended service set (ESS) 120 and IEEE 802 LAN or WAN 122.ESS 120 comprises the Basic Service Set (BSS) 102 and second Basic Service Set (BBS) 112.The one BSS 102 comprises 104, the two 802.11WLAN base stations 106, the one 802.11 wireless lan (wlan) base station and access point (AP) 108.The 2nd BSS 112 comprises 114, the two 802.11WLAN base stations 116, a 802.11WLAN base station and access point (AP) 118.IEEE 802 LAN 122 or WAN comprise LAN orWAN base station 124 and inlet (portal) 126.IEEE 802.11 WLAN base stations or IEEE 802.11 wlan devices are the wlan systems that meet at least a portion IEEE 802.11 standards.

WLAN is a communication network environment, comprising a plurality of wlan devices, can by or a plurality of up and/or descending RF channel carry out radio communication.BSS 102 or 112 is parts of IEEE 802.11WLAN, comprising at least two IEEE 802.11WLAN base stations for example a 802.11WLAN base station 104 and the 2nd 802.11WLAN base station 106 are arranged, and AP108, above-mentioned these all are the parts of BSS 102.Non-AP base station among the BSS102 can form with AP108 separately with the 2 802.11WLAN base station 106 as a 802.11WLAN base station 104 and to be connected.AP such as AP108 can be used as Ethernet switch in WLAN, bridge or other equipment.Similarly, the non-AP base station among the BSS112 can form with AP118 separately with the 2nd 802.11WLAN base station 116 as the one 802.11WLAN base station 114 and to be connected.

In case formed connection between the one 802.11WLAN base station 104 and AP 108, AP108 just can send to the reachability information relevant with a 802.11WLAN base station 104 other AP relevant with ESS 120 and inlet is gone up as AP 118 as enter the mouth 126.Information can wirelessly be transmitted by BSS 102 subsequently in WLAN base station 104.Otherwise AP 118 will the reachability information relevant with the one 802.11WLAN base station 104 sends on the base station among the BSS112.Theinlet 126 that for example can be used as Ethernet switch among the LAN or other equipment sends to the reachability information relevant with the one 802.11WLAN base station 104 on the base station of LAN or WAN 122, as 802LAN or WAN base station 104.About the transmission of the reachability information of the one 802.11WLAN base station 104 can make not in BSS102 but radio communication is carried out by ESS120 and the one 802.11WLAN base station 104 in the WLAN base station relevant with ESS120.

DS110 provides a kind of infrastructure, makes that radio communication can be carried out with the 2 802.11WLAN base station 114 among other BSS 112 in the one 802.11WLAN base station 104 among the BSS 102.DS 110 can also make the one 802.11WLAN base station 104 among the BSS 102 communicate with 802 LAN orWAN base station 124 among IEEE 802 LAN or the WAN 122, and IEEE 802 LAN or WAN 122 can be used as wired LAN or WAN.AP 108, and AP 118 or enter the mouth and 126 provide a kind of method can makeBSS 102 by this method, and transmission information can be come by DS110 in 802 LAN amongBSS 112 or the LAN/WAN122 or WAN base station.802.11WLAN base station 104 in BSS 102 by with information wireless be sent to AP 108, and then with information wireless send to the one 802.11WLAN base station 114 among the BSS112, correspondingly, AP 108 is sent to AP118 by DS110 with information, thus can with information wireless be sent tobase station 114 among the BSS 112.The one 802.11WLAN base station 104 by with information wireless be sent to AP 108, and then with information wireless send to 802 LAN orWAN base station 124 among LAN or the WAN122, AP 108 is sent toinlet 126 by DS11O with information, thereby information is sent to 802 LAN orWAN base station 124 among LAN or the WAN 122.DS110 can pass through the RF channel, wire communication such as IEEE 802.3 or Ethernet, or their various combinations utilize radio communication.

When transmission information, the WLAN base station, as 104,114, or AP can utilize or a plurality of transmitting antenna and or a plurality of reception antenna as 108,118.Utilize the WLAN base station or the AP of a plurality of transmitting antennas and/or a plurality of reception antennas to be known as multiple-input and multiple-output (MIMO) system.

Fig. 2 is the structure chart of the typical radio transceiver system that can be used in combination with the embodiment of the invention.For example, wireless receiver is in conjunction withjoint access 126,access point 106, and/or use 802.11WLAN base station 104.The exemplary embodiments of receiver is the radio network interface subsystem.Referring to Fig. 2, shown transceiver 274, RF front end 280, or a plurality of reception antenna 276a ... 276n and or a plurality of transmitting antenna 278a ... 278n. transceiver 274 comprises processor 282, memory 272, receiver 284 and reflector 286.

Processor 282 can be finished digital received and/or emission function according to the communication standard that is suitable for.These functions include but not limited to: finishing in the lower level of related protocol reference model of task.These tasks further comprise physical layer convergence rules (physical layer convergence procedure, be called for short PLCP), physical medium be correlated with sublayer (Physical Medium Dependent, abbreviation PMD) function and stratum conjunctum management function.As describing in detail in relevant criterion, these tasks further comprise medium access control (MAC) layer function.

Memory 272 comprises suitable logic, circuit, and/or code, be used for data and/storage and/or the recovery of code.For example, the code of storage comprises execution bridge/or Routing Protocol.For example, the data of storage comprise be applied to bridge/or the code of Routing Protocol carry out data on the basis.The data of storage also comprise received data, and/or with the data of launching.Data recovered and/or code can be assigned to physical resource to store in memory 272.The data and/or the code of storage can be used for recovering subsequently.Data recovered and/or code be by memory 272 output, and be transferred to other equipment, assembly and/or with memory 272 directly or indirectly communication link to each other subsystem.Memory 272 can make the data of storage and/or code keep storage and/or available state, is used for later recovery, is used in stored resource up to branch and is reallocated.Physical resource can be redistributed according to the instruction that receives, and this instruction is used for deleting data and/or the code that memory 272 has been stored; Or redistribute based on the instruction that receives, this instruction is that branch is used in the later data of storage and/or the physical resource of code.Memory utilizes a plurality of storage medium technology, for example variable memory, for example random-access memory (ram), and/or nonvolatile memory, for example electricallyerasable ROM (EEROM) (EEPROM).

Receiver 284 possesses the digital received function, and this function includes but not limited to the fast fourier transform processing, and wave beam forms to be handled, and mapping is separated in equilibrium, demodulation control, and (depuncture) decoding of punchinging is separated in deinterleaving.But reflector 286 combine digital transmitter function, this function include but not limited to coding, and punching (puncture) interweaves, mapping, and modulation control, inverse fast fourier transform is handled, and wave beam forms to be handled.RF front end 280 passes through or a plurality of antenna 276a ... 276n receives analog rf signal, by with the RF conversion of signals on the base band and generate digital signal with received analog baseband signal equivalence.RF front end 280 leaves are also by antenna 278a ... 278n launching simulation RF signal is by being converted to analog rf signal with digital baseband signal.

In operation, processor 282 receptions are from the data of receiver 284.Processor 282 sends to memory 272 with received data and stores.Processor 282 can recover the data of memory 272, thereby is gone out by the RF channels transmit by reflector 286.Memory 272 can send to data on the processor 282.Processor 282 produces signal, and the operation of the modulation program in the reflector 286 and the operation of the demodulation process in the receiver 284 are controlled.

Processor 282 also possesses the function of carrying out day line options in reflector 286 and/or receiver 284.When carrying out the antenna selection function in reflector 286, processor 282 can produce explore frame (sounding frame) explore frame that can be used in the antenna training sequence.Explore frame can pass through transmitting antenna 276a ... among the 276n or a plurality of the emission.Based on the feedback information that receives by receiver 284, processor 282 by with each with the RF link that is launched and each transmitting antenna 276a ... 276n combines, thereby finishes a day line options in reflector 286.When the signal after the emission from the RF link, can utilize a day line options.When carrying out day line options at receiver 284, processor 282 can calculate the channel guess value matrix based on received explore frame.The channel guess value matrix can be used for each receives RF link and each reception antenna 278a in the receiver 284 ... 278n combines.The reception antenna collection can be the same with the transmitting antenna collection, also can be different.

Fig. 3 is the schematic diagram of the sky line options feedback that can be used in combination with the embodiment of the invention.Referring to Fig. 3, shown emissionportable terminal 302, mobile terminal receive 322 and communication media344.Communication media 344 can be represented wireless communication medium.Emissionportable terminal 302 can be transmitted into mobile terminal receive 322 with signal vector X by communication media 344.Communication direction from emissionportable terminal 302 to mobile terminal receive 322 can be described as down direction.Signal vector X comprise by or a plurality of transmitting antenna a plurality of spatial data of launching simultaneously.Signal vector X comprise from or the signal of a plurality of RF links, each all includes explore frame.By or a plurality of transmitting antenna can be launched or a plurality of RF link in every.Signal vector X can propagate by communication media 344.When propagating bycommunication media 344, conversion can take place in signal vector X.The emission characteristic relevant withcommunication media 344 can be expressed as tansfer function H.Signal vector X can carry out conversion according to tansfer function H.Signal vector X after the conversion can be expressed as signal Y.Mobile terminal receive 322 receives signal Y.

Emissionportable terminal 302 is launched antenna training sequence corresponding subsequent signal vector X a series of and that utilize in the antenna option program.By or the subsequent set of a plurality of transmitting antennas, can launch follow-up signal vector X.In various embodiments of the present invention, in subsequent set, have at least transmitting antenna also to be used to launch previous signal vector X, and/or launch the signal vector X that is launched away afterwards.

Based on the corresponding sequence of received signal Y, mobile terminal receive 322 determines or a plurality of values relevant with tansfer function Hdown according to the received signal Y ofcommunication media 344, on this tansfer function Hdown is.Based on received signal Y sequence and the tansfer function Hdown that is calculated, mobile terminal receive 322 can calculate a day line options feedback vector.Each day, the line options feedback vector all comprised a plurality of bits, and it is to select which transmitting antenna to distribute accordingly transmitting RF link signal that wherein every bit all is illustrated on thelaunch terminal 302.

Mobile terminal receive 322 transmits day a line options feedback vector and/or a CSI by emission signal vector Xf.Emission signal vector Xf can be transmitted into emissionportable terminal 302 by communication media 344.When propagating bycommunication terminal 344, conversion may take place in signal vector Xf.Mobile terminal receive 322 is called up direction to the communication direction of emission portable terminal 302.Signal vector Xf can carry out conversion according to tansfer function H.In up direction, tansfer function H is known as Hup.Signal vector Xf after the conversion can be expressed as signal Yf.Emissionportable terminal 302 received signal Yf.

Emissionportable terminal 302 basis or a plurality of signal Yf that receive are assigned to each with on the RF link that is launched with each transmitting antenna.From the follow-up data of the RF link that will be launched can by or more a plurality of transmitting antenna launch, this antenna can distribute according to received before sky line options feedback vector.

Fig. 4 is the schematic diagram that the wave beam that can be used in combination with the embodiment of the invention forms.Referring to Fig. 4, show emission portable terminal 402, mobile terminal receive 406 and wireless communication medium 404.A kind of typical emission portable terminal 402 can be AP 108.A kind of typical mobile terminal receive 406 is can 802.11 WLAN base stations 104.Emission portable terminal 402 can be mimo system.Mobile terminal receive 406 can be mimo system.Emission portable terminal 402 comprises emissionspace mapping matrix 408, a plurality of inverse fast fourier transforms (IFFT)piece 410a, and 410b ... with 410n and a plurality of transmittingantenna 412a, 412b ... and 412n.Mobile terminal receive 406 comprisesspatial equaliser 422, a plurality of fast Fourier transform (FFT) piece 422a, 422b ... with 422n and a plurality ofreception antenna 426a, 426b ... and 426n.

Spatial mappings matrix 408 comprises steering matrix (steering matrix) Q, and this matrix can calculate and generate that a plurality of (wherein Ntx is the variable of the expression RF number of links that will be launched and Ntx 〉=Nss) with the RF link that is launched to a plurality of spatial data (wherein Nss is the variable of representation space fluxion amount).A plurality of spatial data comprise the first spatial data Stream₁, the second spatial data Stream₂, and Nss spatial data Stream_NssA plurality of the RF link that is launched is comprised the first RF link Tx Chain that is sent out₁, the second RF link that is sent out, Tx Chain₂308, the Ntx the RF link TX Chain that are launched_NtxEach is with the RF link Tx Chain that is launched₁, Tx Chain₂With TX Chain_NtxAll comprise corresponding weighted sum, this weighted sum according to the coefficient among the steering matrix Q from a plurality of spatial data Stream₁, Stream₂... and Stream_NssIn calculate.

IFFT piece 410a can carry out IFFT and calculate, with the RF link Tx Chain that is launched₁Be transformed on the time domain expression formula from frequency-domain expression.With the RF link x that is launched₁The time domain expression formula can be transmitted intowireless communication medium 404 by transmitting antenna412a.IFFT piece 410b can carry out IFFT and calculate, with the RF link TxChain that is launched₂Frequency domain be transformed on the time domain expression formula from frequency-domain expression.With the RF link x that is launched₂The time domain expression formula can be transmitted intowireless communication medium 404 by transmitting antenna412a.IFFT piece 410n can carry out IFFT and calculate, with the RF link Tx Chain that is launched_NtxFrequency domain be transformed on the time domain expression formula from frequency-domain expression.With the RF link x that is launched_NtxThe time domain expression formula can be transmitted intowireless communication medium 404 by transmitting antenna 412a.A plurality of RF links of emission simultaneously can be expressed as emission signal vector X.

Reception antenna 426a is bywireless communication medium 404 received signal y₁Fft block 424a can carry out FFT and calculate, with received signal y₁The time domain expression formula be transformed into received RF link Rx Chain₁Frequency-domain expression on.Reception antenna 426b is bywireless communication medium 404 received signal y₂Fft block 424b can carry out FFT and calculate, with received signal y₂The time domain expression formula be transformed into received RF link RxChain₂Frequency-domain expressionon.Reception antenna 426n is bywireless communication medium 404 received signal y_NtxFft block 424n can carry out FFT and calculate, with received signal y_NtxThe time domain expression formula be transformed into received RF link Rx Chain_NtxFrequency-domain expression on.A plurality of received RF links can be expressed as received signal vector Y.

Spatial equaliser 422 comprises that balanced matrix U can be to calculating on received a plurality of Nrx RF links and can producing a plurality of Nss valuation spatial data.A plurality of received RF links comprise the first received RF link Rx Chain₁, the second received RF link Rx Chain₂308 and Nrx received RF link Rx Chain_NrxA plurality of valuation spatial data comprise the first valuation spatial data

The second valuation spatial data

With Nss valuation spatial data

All be included in the valuation value of the corresponding space data flow of emission portable terminal 402 in each of a plurality of valuation spatial data of mobile terminal receive 406.

It line options is a kind of program, when the RF number of links of emission when being less than the quantity of transmitting antenna, can make in a plurality of transmitting RF links each transmitting RF link assignment give one ormore transmitting antenna 412a, 412b by this program ... 412n launches.In this, when the quantity of transmitting RF link is when being represented by variable Trf_tx, Trf_tx＜Ntx.The antenna option program can determine which RF link by which transmitting antenna is launched.For example, work as Trf_tx=2, during Ntx=3, first transmission antennas transmit, first unique RF link Tx Chain₁, the RF link that second transmission antennas transmit second is unique, Tx Chain₂The 3rd transmitting antenna will be at leisure.In the antenna option program, emission portable terminal 402 is by one or more transmission antennas transmit explore frame sequences.The quantity of the explore frame of launching in sequence equals an integer, and this integer value is not less than the merchant of Ntx/Trf_tx, and wherein Trf_tx represents to launch the RF number of links of portable terminal.

In an exemplary embodiments of the present invention, Trf_tx=2 and Ntx=3, antenna option program comprise that emission comprises the sequence of 2 explore frames.At time t₀On, first explore frame by transmittingantenna 412a and 412b to be labeled as s among Fig. 4₁(t₀) and s₂(t₀) signal launch.For example, signal is propagated bycommunication media 404 and is received in reception antenna 426a.Signal s₁(t₀) can be at t₀+ ε (s₁) constantly arrive reception antenna 426a.Incremental time ε (s₁) phase shift between the signal phase ofexpression transmitting antenna 412a emission and the signal phase thatreception antenna 426a receives.Signal s₂(t₀) at t₀+ ε (s₂) constantly arrive reception antenna 426a.Incremental time ε (s₂) phase shift between the signal phase of expression transmitting antenna 412b emission and the signal phase thatreception antenna 426a receives.Utilizereception antenna 426a, 426b and 426n can be expressed as following formula from the channel guess value value that first explore frame calculates in mobile terminal receive 406:

$H\left(t_0\right)=\left[\begin{array}{cc}{h}_{11}{e}^{{\mathrm{j\φ}}_1}& h_{12}{e}^{{\mathrm{j\φ}}_1}\\ h_{21}{e}^{{\mathrm{j\φ}}_1}& h_{22}{e}^{{\mathrm{j\φ}}_1}\\ h_{31}{e}^{{\mathrm{j\φ}}_1}& h_{32}{e}^{{\mathrm{j\φ}}_1}\end{array}\right]$Formula (1)

In the formula, Φ₁Be the phase shift of first explore frame, each element h_JkAll be used to emission portable terminal 402 K transmission antennas transmit signal and by the channel fade characteristics ofwireless communication medium 404 channels of the signal of j reception antenna reception of mobile terminal receive 406.

At t₁Constantly, second explore frame by transmittingantenna 412b and 412n to indicate s among Fig. 4₂(t₁) and s₃(t₁) signal launches.For example, signal is propagated bycommunication media 404 and is received in reception antenna 426a.Signal s₂(t₁) can be at t₁+ ε (s₂) constantly arrivereception antenna 426a. signal s₃(t₁) can be at t₁+ ε (s₃) constantly arrive reception antenna 426a. and utilizereception antenna 426a, 426b and 426n can be expressed as following formula at mobile terminal receive 406 from the channel guess value that calculates of second explore frame:

$H\left(t_1\right)=\left[\begin{array}{cc}{h}_{12}{e}^{{\mathrm{j\φ}}_2}& h_{13}{e}^{{\mathrm{j\φ}}_2}\\ h_{22}{e}^{{\mathrm{j\φ}}_2}& h_{23}{e}^{{\mathrm{j\φ}}_2}\\ h_{32}{e}^{{\mathrm{j\φ}}_2}& h_{33}{e}^{{\mathrm{j\φ}}_2}\end{array}\right]$Formula (2)

After receiving two explore frames, according to embodiments of the invention, mobile terminal receive 406 utilizes the redundant information relevant with transmitting antenna 2 to calculate phase shift difference Φ 1-Φ 2.Mobile terminal receive 406 utilizes this phase shift difference can calculate all channel valuation matrix, and this matrix is the merging of H (t0) and H (t1), and is not easy by the noise terminal and can be used as CSI to feed back.

Based on all channel valuation matrix that is calculated, mobile terminal receive 406 has produced one or more days line options feedback vectors.In this example, mobile terminal receive has produced a day line options feedback vector.Mobile terminal receive 406 carries out the distribution of antenna based on various standards.For example, all channel valuation matrix that mobile terminal receive 406 utilization calculates each reception antenna 426a that serves as reasons, 426b ... with the 426n reception and by each transmitting antenna 412a, 412b ... its capacity statistical value of calculated signals of 412n emission.Based on the capacity statistical value, mobile terminal receive 406 carries out antenna assignment.For example, if when comparing with the signal volume of merging group by antenna 412a and 412n and 412b and 412n and emission, signal volume by transmitting antenna 412a and 412b emission is bigger, it line options feedback vector then with the first transmitting RF link assignment to transmitting antenna 412a, with the second transmitting RF link assignment to transmitting antenna 412b.It line options feedback vector comprises a plurality of bits, 8 bits for example, in these bits, each bit all corresponding transmitting antenna.In exemplary embodiments of the present invention, value is that 1 bit represents that corresponding transmitting RF link has been assigned on the transmitting antenna of being represented by this bit.Bit position among it line options feedback vector can be used as the index of the transmitting antenna of emission portable terminal 402.

As a plurality of space-time data stream STStream1, STStream2 ... STStreamNsts replaces a plurality of spatial data Stream1, Stream2 ... during StreamNss, just can realize various embodiment of the present invention, this a plurality of when empty data flow can produce based on space-time code (STC) and/or space-time block coding (STBC), wherein Nsts is a variable of representing space-time data fluxion amount.Can produce a plurality of Nsts space-time data streams according to a plurality of Nss spatial data.

By a plurality of spatial data Stream1, Stream2 ... form or pass through a plurality of space-time datas stream STStream1 with the wave beam of StreamNss, STStream2 ... form with the STStreamNsts wave beam and can produce a plurality ofly during, also can realize a lot of embodiment of the present invention the RF link that is launched.

In various embodiment of the present invention, the feedback information that mobile terminal receive 322 sends to emissionportable terminal 302 comprises day a line options index or a channel condition information, for example based on the CSI of all channel valuation matrix that is calculated.Emission portable terminal 402 can utilize day line options index or CSI to determine day line options and/or carry out wave beam and form.

Ntx	The explore frame sequence number	The transmission antennas transmit explore frame
				1	[1]
	2	[2]
				3	[3]
	4	[4]
				5	[5]
	6	[6]
				7	[7]
	8	[8]
			Table 1: wherein Trf_tx=1 is with the explore frame sequence of the MIMO reflector of the RF link that is launched

What table 1 showed is the explore frame sequence of Trf_tx=1 in having the MIMO emission portable terminal 402 of Ntx transmitting antenna.In this example, can launch Ntx explore frame sequence with the antenna option program.In table 1, what first hurdle was represented is the quantity of transmitting antenna Ntx, and what second hurdle was represented is the sequence number of explore frame in the explore frame sequence.What third column was represented is the transmitting antenna that is used for launching simultaneously the corresponding explore frame in second hurdle.Transmitting antenna can be represented that the transmitting antenna collection that is wherein utilized comprises parenthetic space interval tabulation (space separated list) by index.

In the typical explore frame sequence of table 1, each explore frame all has the duration, is about for 24 μ seconds in the wlan system of greenery patches (greenfield), or is about for 36 μ seconds in the mixed mode wlan system.Wherein greenery patches wlan system and mixed mode wlan system are expressed as the IEEE802.11nTM/D1.0 standard respectively in IEEE.

What table 2 showed is the explore frame sequence of Trf_tx=2 in having the MIMO emission portable terminal 402 of Ntx transmitting antenna.Ntx＞2 o'clock, a plurality of optional explore frame sequence that table 2 representative can be used in combination with this inventive embodiments.In table 2, the X representative is from concentrating the transmitting antenna of selecting by the transmitting antenna of index [1 2] expression, the Y representative is from concentrating the transmitting antenna of selecting by the transmitting antenna of index [3 4] expression, the Z representative is from concentrating the transmitting antenna of selecting by the transmitting antenna of index [5 6] expression, and the W representative is from concentrating the transmitting antenna of selecting by the transmitting antenna of index [7 8] expression.

Ntx	The explore frame sequence number	The transmission antennas transmit explore frame
			3	1	[1 2]
2	[X 3]
		4		1	[1 2]
2	[3 4]
			3	[X Y]
5	1				[1 2]
		2	[3 4]
	3			[5 X]
		4	[X Y]

	1	[1 2]
			2	[3 4]
	3	[5 Y]
			4	[X Y]
	6	1			[1 2]
2			[X Y]
		3		[3 4]
4			[3 5]
		5		[5 6]
1			[1 2]
		2		[3 4]
3			[5 6]
		4		[X Y]
5			[Y Z]
		1		[1 2]
2			[3 4]
		3		[5 6]
4			[X Z]
		5		[Y Z]
1			[1 2]
		2		[3 4]
3			[5 6]
		4		[X Y]
5			[X Z]
		7		1	[1 2]

	2	[3 4]
			3	[5 6]
	4	[7 X]
			5	[X Y]
	6	[Y Z]
			1	[1 2]
	2	[3 4]
			3	[5 6]
	4	[7 X]
			5	[X Z]
	6	[Y Z]
			1	[1 2]
	2	[3 4]
			3	[5 6]
	4	[7 X]
			5	[X Y]
	6	[X Z]
			1	[1 2]
	2	[3 4]
			3	[5 6]
	4	[7 Y]
			5	[X Z]
	6	[Y Z]
			1	[1 2]
	2	[3 4]

	3	[5 6]
			4	[7 Y]
	5	[X Y]
			6	[X Z]
	1	[1 2]
			2	[3 4]
	3	[5 6]
			4	[7 Z]
	5	[X Y]
			6	[Y Z]
	1	[1 2]
			2	[3 4]
	3	[5 6]
			4	[7 8]
	5	[X Y]
			6	[Y Z]
	1	[1 2]
			2	[3 4]
	3	[5 6]
			4	[7 Z]
	5	[X Z]
			6	[Y Z]
	1	[1 2]
			2	[3 4]
	3	[5 6]

	4	[7 Z]
			5	[X Y]
	6	[X Z]
			8	1	[1 2]
2	[3 4]
		3		[5 6]
4	[7 8]
		5		[X Y]
6	[Y Z]
		7		[X W]
1	[1 2]
		2		[3 4]
3	[5 6]
		4		[7 8]
5	[X Y]
		6		[Y Z]
7	[Y W]
		1		[1 2]
2	[3 4]
		3		[5 6]
4	[7 8]
		5		[X Y]
6	[Y Z]
		7		[Z W]
1	[1 2]

	2	[3 4]
			3	[5 6]
	4	[7 8]
			5	[X Z]
	6	[Y Z]
			7	[X W]
	1	[1 2]
			2	[3 4]
	3	[5 6]
			4	[7 8]
	5	[X Z]
			6	[Y Z]
	7	[Y W]
			1	[1 2]
	2	[3 4]
			3	[5 6]
	4	[7 8]
			5	[X Z]
	6	[Y Z]
			7	[Z W]
	1	[1 2]
			2	[3 4]
	3	[5 6]
			4	[7 8]
	5	[X W]

	6	[Y W]
			7	[X Z]
	1	[1 2]
			2	[3 4]
	3	[5 6]
			4	[7 8]
	5	[X W]
			6	[Y Z]
	7	[Z W]
			1	[1 2]
	2	[3 4]
			3	[5 6]
	4	[7 8]
			5	[X W]
	6	[Y W]
			7	[X Z]
	1	[1 2]
			2	[3 4]
	3	[5 6]
			4	[7 8]
	5	[X Y]
			6	[Y W]
	7	[X Z]
			1	[1 2]
	2	[3 4]

	3	[5 6]
			4	[7 8]
	5	[X Y]
			6	[Y W]
	7	[Z W]
			1	[1 2]
	2	[3 4]
			3	[5 6]
	4	[7 8]
			5	[X W]
	6	[Y W]
			7	[Z W]
	1	[1 2]
			2	[3 4]
	3	[5 6]
			4	[7 8]
	5	[X W]
			6	[Y Z]
	7	[Z W]
			Table 2: have the explore frame of Trf_tx=2 with the MIMO reflector of the RF link that is launched

In the typical explore frame sequence in table 2, every sound wave frame explore frame all has the duration, wherein is approximately for 28 μ seconds in the wlan system of greenery patches, or is approximately for 40 μ seconds in the mixed mode wlan system.

What table 3 showed is the explore frame sequence of launching the Trf_tx=3 of portable terminal 402 at the MIMO that has Ntx=4 transmitting antenna.In table 3, the X representative is from concentrating the transmitting antenna of selecting by index [1 2 3] expression index transmitting antenna.

The explore frame sequence number	The transmission antennas transmit explore frame
		1	[1 2 3]
2	[X 3 4]
		1	[1 2 3]
2	[X 4]
		Table 3: have Ntx=4, Trf_tx=3 is with the explore frame sequence of the MIMO reflector of the RF link that is launched

In table 3 first three rows, each explore frame all has the duration, wherein is approximately for 72 μ seconds in the wlan system of greenery patches, or is approximately for 96 μ seconds in the mixed mode system.In table 3 fourth line, each explore frame all has the duration, wherein is approximately for 64 μ seconds in the wlan system of greenery patches, or is approximately for 88 μ seconds in the mixed mode system.

What table 4 showed is the explore frame sequence of launching portable terminal 402Trf_tx=3 at the MIMO of the transmitting antenna that has Ntx＞4.In table 4, the X representative is from concentrating the transmitting antenna of selecting by the transmitting antenna of index [1 2 3] expression, and the Y representative is from concentrating the transmitting antenna of selecting by the transmitting antenna of index [4 5 6] expression.

Ntx	The explore frame sequence number	The transmission antennas transmit explore frame
			5	1	[1 2 3]
2	[x 4 5]
		6		1	[1 2 3 ]
2	[4 5 6]
			3	[X Y 5]
1	[1 2 3]
			2	[4 5 6]
3	[X Y]
			7	1	[1 2 3]

	2	[4 5 6]
			3	[X Y 7]
	8	1			[1 2 3]
2			[4 5 6]
		3		[X 7 8]
4			[Y 7 8]
		1		[1 2 3]
2			[4 5 6]
		3		[X 7 8]
4			[X Y]
		Table 4: have Trf_tx=3 explore frame sequence with the MIMO reflector of the RF link that is launched

What table 5 showed is the explore frame sequence of Trf_tx=4 in the MIMO of the transmitting antenna that has Ntx＞5 emission portable terminal 402.In table 5, X1, X2, X3 each all represent can be from concentrating the transmitting antenna of selecting by the transmitting antenna of index [1 23 4] expression, Y1, Y2, Y3 each all represent can be from concentrating the transmitting antenna of selecting by the transmitting antenna that is selected from index [5 67 8] expression.

Ntx	Explore frame sequence quantity	The transmission antennas transmit explore frame
			5	1	[1 2 3 4]
2	[X 5]
		1		[1 2 3 4]
2	[X1 X2 X3 5]
		6		1	[1 2 3 4]
2	[X 5 6]
			1	[1 2 3 4]
2	[X1 X2 5 6]

7	1	[1 2 3 4]
			2	[X 5 6 7]
	8	1			[1 2 3 4]
2			[5 6 7 8]
		3		[X1 X2 Y1 Y2]
1			[1 2 3 4]
		2		[5 6 7 8]
3			[X1 X2 X3 Y2]
		1		[1 2 3 4]
2			[5 6 7 8]
		3		[X1 Y1 Y2 Y3]
Table 5: have Tfr_tx=4 explore frame sequence with the MIMO reflector of the RF link that is launched

A plurality of embodiment of the present invention can both make transmitting antenna and reception antenna unite selection.In the joint antenna selection course, mobile terminal receive 406 transmit receive antennas select probe requests thereby to emission portable terminal 402.Reception antenna selects probe requests thereby to comprise the request of emission portable terminal 402 beginning emission detection frame sequences, wherein according to the regulation in the request, can repeat repeatedly to launch each explore frame.For the repetition each time of given explore frame, mobile terminal receive 406 selectivereception antenna collection 426a, 426b ... and 426n, this reception antenna collection can be used for receiving explore frame.The number of repetition of each explore frame equals an integer that is not less than the merchant of Ntx/Trf_tx in the sequence, and wherein Trf_tx represents the quantity of the RF link in the mobile terminal receive 406.

After the emission detection frame sequence, mobile terminal receive 406 calculating channel valuation matrixes, this matrix is used for receiver and carries out a day line options.Mobile terminal receive 406 also can generate day a line options feedback vector or a CSI.Mobile terminal receive 406 can be launched these antenna and select feedback vector or CSI, and as previously mentioned, the emission portable terminal utilizes this vector or CSI.In addition, in a plurality of embodiment of the present invention, based on the single sequence of the explore frame that is launched, the joint antenna selection course can make antenna be chosen on mobile terminal receive 406 and the emission portable terminal and finish.

For example, referring to Fig. 4, in mimo system, work as Trf_tx=2, Trf_rx=2, Ntx=4 and Nrx=4, mobile terminal receive 406 transmit receive antennas are selected probe requests thereby, be used for request emission portable terminal 402 and begin to carry out a day line options, in this process, each explore frame all is launched 2 times.Emission portable terminal 402 utilizes transmittingantenna 1 and 2 to launch first explore frame constantly at t0.For example, mobile terminal receive 406 utilizesreception antenna 1 and 2 to receive the signal of having launched that first explore frame is carried in wherein carrying.Emission portable terminal 402 utilizes transmittingantenna 1 and 2 to launch first explore frame constantly for the second time at t1.For example, mobile terminal receive 406 utilizes reception antenna 3 and 4 to be received in and repeats transmitting of middle carrying first explore frame for the second time.

What table 6 showed is the explore frame sequence of the Trf_tx=2 in having Ntx=4 transmitting antenna MIMO emission portable terminal 402.In table 6, the Xj representative is from concentrating the transmitting antenna of selecting by the transmitting antenna of index [1 2] expression, the Yj representative is from concentrating the transmitting antenna of selecting to be selected from the transmitting antenna of transmitting antenna collection by the transmitting antenna of index [3 4] expression, the Xk representative is from concentrating the reception antenna of selecting by the reception antenna of index [1 2] expression, the Yk representative is from concentrating the reception antenna of selecting by the reception antenna of index [3 4] expression, the Zk representative is from concentrating the reception antenna of selecting by the reception antenna of index [5 6] expression, the selection of transmitting antenna Xj and/or Yj is independent of reception antenna Xk, the selection of Yk and/or Zk.

Ntx	Nrx	The explore frame sequence number	The transmission antennas transmit explore frame	Reception antenna receives explore frame
					4	4	1	[1 2]	[1 2]
2	[1 2]	[3 4]
			3	[3 4]			[1 2]
4	[3 4]	[3 4]
			5	[Xj Yj]			[Xk Yk]
4	6	1						[1 2]	[1 2]
			2	[1 2]	[3 4]
		3				[1 2]	[5 6]
			4	[3 4]	[1 2]
		5				[3 4]	[3 4]
			6	[3 4]	[5 6]

		7	[Xj Yj]	[Xk Yk]
					8	[Xj Yj]	[Yk Zk]
		Table 6. joint antenna is selected Trf_tx=2

Referring to table 6, in legacy system, work as Ntx=4, Nrx=4 launches 36 sequences and can obtain channel guess value or carry out a day line options.In a plurality of embodiment of the present invention, launch 5 sequences and can obtain channel guess value.Work as Ntx=4, Nrx=6 in legacy system, launches 90 sequences and can obtain channel guess value.In a plurality of embodiment of the present invention, launch 8 sequences and can obtain channel guess value.

Fig. 5 is the schematic diagram that carries out the frame transform of day line options in reflector according to one embodiment of the invention.Referring to Fig. 5, a plurality of explore frames that send by the MIMO reflector have been shown, AP 108 (Fig. 1) for example, and the explore frame that receives by a plurality of receivers such as the explore frame of 802.11WLAN base station 104 emissions.BeforeMIMO reflector 108 was attempted to launch first explore frame in the antenna option program, institute's elapsed time was for returning the duration, as the TBackoff among Fig. 5.

Inexplore frame 502,MIMO reflector 108 is launched first explore frame in the antenna option program.First explore frame comprises sequence number, and this sequence number is used to represent thatframe 502 is first explore frames, and/or has shown the quantity of the subsequent probe frame of launching during the sky line options.First explore frame can be launched simultaneously by the one or more transmitting antennas shown in the table 1-6.First explore frame also comprises designator, and being used in reference to and being shown in the subsequent probe frame of launching during the antenna option program is explore frame, and this explore frame has detailed description in the IEEEP802.11nTM/D1.0 standard in the present invention.

Last atemission detection frame 502 begun the interframe time interval of short at interval (short interframespacing is called for short SIFS), as the duration of being represented by TSFIS among Fig. 5.The SIFS time interval has been specified a duration, and this duration carries out just having pass by before emission second explore frame in the antenna option program at the MIMO reflector.

In explore frame 504,MIMO reflector 108 is launched first explore frame in the antenna option program.First explore frame is second explore frame of launching in the antenna option program.Second explore frame comprises sequence number, and this sequence number is used to represent that frame 504 is second explore frames, and/or has shown the quantity of the subsequent probe frame of launching during the sky line options.Second explore frame can be launched simultaneously by the one or more transmitting antennas shown in the table 1-6.

Last at emission detection frame 504 begun another SIFS time interval.The SIFS time interval has been specified a duration, and this duration carries out just having pass by before emission second explore frame in the antenna option program at the MIMO reflector.Each subsequent probe frame of emission is afterwards all followed by the SIFS time interval in the antenna option program.

Inexplore frame 506,MIMO reflector 108 is launched last explore frame in the antenna option program.Last explore frame is last explore frame in N the explore frame of launching in the antenna option program, the wherein quantity of the explore frame that is launched in the N representative antennas option program.Last explore frame comprises and shows that exploreframe 506 is sequence numbers of last explore frame, and/or is presented at the explore frame sequence that was not launched afterwards in the antenna option program.Last explore frame can be launched simultaneously by the one or more transmitting antennas shown in the table 1-6.

Last atemission detection frame 506 begun the SIFS time interval, as among Fig. 5 by shown in the TSIFS.The SIFS time interval has been specified a duration, and this duration had just pass by beforeMIMO receiver 104 beginning emitting antenna selecting feedback informations.Last in the SIFS time interval,MIMO receiver 104 has been launched a day line optionsfeedback information frame 508 to MIMO reflector 108.It lineoptions feedback frame 508 comprises one or more days line options feedback vectors.

The antenna option program that carries out at reflector that shows based on Fig. 5, butMIMO reflector 108 emission detection frame sequences are to MIMO receiver 104.Explore frame in the sequence is by 108 emissions of MIMO reflector, andMIMO receiver 104 is used to launch the transmitting antenna of each explore frame as can be known.In a plurality of embodiment of the present invention, the utilization of MIMO receiver is calculated phase relation between the signal ofMIMO reflector 108 emission and the signal thatMIMO receiver 104 receives to the identification of explore frame transmitting sequence.The ability that can calculate phase relation between the signal can makeMIMO reflector 108 than still less explore frame in the transmitting sequence in traditional antenna option program.

MIMO receiver 104 calculates the channel guess value matrix based on received explore frame.Based on the channel guess value matrix that is calculated,MIMO receiver 104 has produced CSI or day line options feedbackvector.MIMO reflector 108 utilize data among the CSI or day line options feedback vector with each with the RF link assignment that is launched to each transmitting antenna.When afterwards signal of emission in the MIMO communication system,MIMO reflector 108 just utilizes this distribution.

Fig. 6 is the schematic diagram according to the frame transform that carries out the joint antenna selection in reflector and receiver of one embodiment of the invention.Referring to Fig. 6, a plurality of explore frames that MIMO reflector such as AP 108 (Fig. 1) and MIMO receiver send as 802.11WLAN base stations 104 have been shown.

Inexplore frame 602,MIMO receiver 104 starts to unite by the transmit receive antenna probe requests thereby and transmits and receives a day line options.The reception antenna probe requests thereby comprises the sequence of explore frame in therequest MIMO reflector 108 beginning emitting antenna selecting programs.The reception antenna probe requests thereby also comprises request with each explore frame emission in the sequence nearly R time, and wherein R represents the number of times that the explore frame ofMIMO receiver 104 requests repeats.Based on antenna amount Nrx that receives and the RF number of links Trf_rx that receives,MIMO receiver 104 can calculate the value of R.

Various embodiments of the present invention are that the phase shift difference between calculating channel valuation matrix H (t0) and the H (t1) (being expressed as formula [1] and formula [2] respectively) provides a kind of effective method.For example,, for example work as Trf_rx=2, can calculate phase shift difference φ 3, wherein φ 3=φ 1-φ 2 based on channel guess value matrix H (t0) and H (t1) last column separately.In various embodiments of the present invention, calculate the ability of phase shift difference based on the explore frame of being launched and to carry out joint antenna selection and accurate channel condition information.

Last atemission detection frame 602 begun interframe short (SIFS) at interval, and this duration at interval is shown in the TSIFS among Fig. 6.The SIFS time interval has been specified a duration, just is through with before the explore frame of theexplore frame 602 of this duration inMIMO reflector 108 transmitting response joint antenna option programs.

Inexplore frame 604,MIMO reflector 108 is launched first explore frame in the joint antenna option program.First explore frame comprises sequence number, and this sequence number is used to represent thatexplore frame 604 is first explore frames, and/or is illustrated in the quantity of missile subsequent probe frame in the joint antenna option program.First explore frame can be launched simultaneously by the one or more transmitting antennas in theMIMO reflector 108, and is received simultaneously by one or more reception antennas in theMIMO receiver 104, as above shown in the table 6.

Last atemission detection frame 604, the SIFS time interval has begun in addition.The SIFS time interval has been specified a duration, and this duration just was through withMIMO reflector 108 is launched subsequently explore frame in the joint antenna option program before.

In explore frame 606,MIMO reflector 108 has been launched first explore frame in the antenna option program.When the R value greater than 1 the time,MIMO reflector 108 is launched first explore frame by the same transmitting antenna that is used for emission detection frame 604.Yet onMIMO receiver 104, the one or more reception antennas that are used to receive explore frame 606 are not used to receiveexplore frame 604, as above shown in the table 6.

Last at emission detection frame 606, another SIFS time interval has begun.The SIFS time interval has been specified a duration, and this duration just is through with before subsequently the explore frame inMIMO reflector 108 emission joint antenna option programs.The subsequent transmission each time of explore frame is afterwards followed by the SIFS time interval in the joint antenna option program.

Inexplore frame 608,MIMO reflector 108 is launched last explore frame in the joint antenna option program.Last explore frame can be launched simultaneously by one or more transmitting antennas in theMIMO reflector 108, and received simultaneously by the one or more reception antennas in the MIMO receiver, as above shown in the table 6.

Last atemission detection frame 608, the SIFS time interval that shows as TSIFS among Fig. 6 has just begun.The SIFS time interval has been specified a duration, and this duration just was through with beforeMIMO receiver 104 beginning emitting antenna selecting feedback informations.Last in the SIFS time interval is onMIMO receiver 104 emitting antenna selecting feedback information frames 610 to the MIMO reflectors 108.It lineoptions feedback frame 508 comprises a day line options feedback vector.

Based on the joint antenna option program that Fig. 6 shows,MIMO receiver 104request MIMO reflectors 108 emission detection frame sequences are to MIMO receiver 104.Each explore frame in more than 108 transmitting sequence of MIMO reflector is also indicated in this request, and emitting times is represented explore frame by repeat indicatorR.MIMO receiver 104 can distinguish that wherein each explore frame is by the sequence and the transmitting antenna that is used to launch each explore frame of 108 emissions of MIMO reflector.Before emission subsequent probe frame, current explore frame in theMIMO reflector 108 emission R subsequence.In a plurality of embodiment of the present invention, the utilization of MIMO receiver is calculated phase relation between the signal ofMIMO reflector 108 emission and the signal thatMIMO receiver 104 receives to the identification of explore frame transmitting sequence.

Based on received explore frame,MIMO receiver 104 can calculate one or more channel guess value matrixes.For example,MIMO receiver 104 calculates one group of R channel guess value matrix; One of them is to be used for carrying out the configuration of each reception antenna at the joint antenna option program.Based on the channel guess value matrix that calculates, the RF link assignment thatMIMO receiver 104 will respectively receive is to each reception antenna.Withspatial equaliser piece 422 finish the same,MIMO receiver 104 has utilized this distribution in the equilibrium ofspace.MIMO receiver 104 has also produced a day line options feedbackvector.MIMO reflector 108 utilizes the data in day line options feedback vectors, with each with the RF link assignment that is launched to each transmitting antenna.When emission follow-up signal in the MIMO communication system,MIMO reflector 108 has utilized this distribution.

Thereby, in a plurality of embodiment of the present invention, the joint antenna option program can makeMIMO receiver 104 andMIMO reflector 108 carry out the distribution of day line options according to the single explore frame sequence of having launched shown in Fig. 6, and this explore frame sequence comprises frame 602,604,606 ... 608 and 610.

Fig. 7 is the flow chart of steps of carrying out day line options in reflector according to one embodiment of the invention.Referring to Fig. 7, instep 702, the RF number of links Trf_tx. that emission portable terminal 402 has been determined to be launched is instep 704, and emission portable terminal 402 has been determined transmittingantenna 412a, 412b ... the quantity Ntx of412n.In step 706, emission portable terminal 402 emission detection frame sequences.The quantity of explore frame of emission is based on variable Trf_tx, Trf_rx, Ntx and/or the quantity Nrx of reception antenna determines on mobile terminal receive 406.After the emission detection frame sequence, emission portable terminal 402 receives day a line options feedback vector and/or a CSI instep 708 in step 706.It line options feedback vector is by mobile terminal receive 406emissions.In step 710, emission portable terminal 402 can be launched each chain Tx and be assigned to each transmittingantenna 412a, 412b ... on the 412n.

Fig. 8 is the flow chart of steps that joint antenna is selected of carrying out according to one embodiment of the invention.Referring to Fig. 8, instep 802, mobile terminal receive 406 is determined the quantity Trf_tx of the RF link thatreceives.In step 804, mobile terminal receive 406 is determinedreception antenna 426a, 426b ... quantity Nrx with426n.In step 806, mobile terminal receive 406 transmit receive antennas are selectedprobe request.In step 808, mobile terminal receive 406 receives one or moreexplore frames.In step 810, mobile terminal receive 406 with each RF link assignment that receives to eachreception antenna.In step 812, mobile terminal receive 406 emitting antenna selecting feedback and/or CSI are to emission portable terminal 402.

The joint antenna selective system comprises the receiver 284 in the mobile terminal receive 406 on the one hand, be used for by a plurality ofreception antenna 426a, 426b ... 426n receives a plurality of explore frames. and the processor 282 in the mobile terminal receive 406 can be according to the reception of a plurality of explore frames, with a plurality ofreception antenna 426a, 426b ... on of being mapped in a plurality of less radio-frequencies that receive (RF) link signal among the 426n.Reflector 286 in the mobile terminal receive 406 can the emitting antenna selecting feedback informations, and this information is based on that reception to a plurality of explore frames calculates.

A plurality of explore frames comprise the sequence of each explore frame.Among a plurality of explore frames, each independent explore frame can repeat to determine number of times.The invention is not restricted to require each independent explore frame all to repeat identical number of times.Before receiving at least a portion explore frame sequence, the reflector 286 in the mobile terminal receive 406 can be launched request, with indication beginning antenna option program.This request comprise repeat the indication.According to the judgement that receives indication, among received a plurality of explore frames, this processor can receive the explore frame in the explore frame sequence.

Processor 406 can configure different reception antenna combinations from a plurality of reception antennas, be used to receive each repeating frame of explore frame.Utilize a plurality of transmittingantenna 412a, 412b ... same transmission antenna group among the 412n, but each repeating frame of emission portable terminal 402 emission detection frames.For example, by being selected fromreception antenna 426a, 426b ... thereception antenna 1 and 2 that 426n concentrates, repeat the first time that mobile terminal receive 406 receives explore frame, and by repeating the second time of reception antenna 2 and 3 reception explore frames.

Processor 282 can calculate phase shift difference in a plurality of received explore frames at least one.Based on the phase shift difference that at least one calculated, be used to receive a plurality ofreception antenna 426a of a plurality of explore frames, 426b ... and 426n, and at least one is used to indicate at least one transmittingantenna 412a, 412b ... the reflector index of 412n (being used to launch a plurality of explore frames) calculates channel guess value matrix at least.The reflector index energy collecting relevant with a plurality of explore frames that received makes mobile terminal receive 406 determine to utilize which transmittingantenna 412a, 412b ... and/or 412n launches each explore frame.The reflector index comes to determine based on explore frame reception in a plurality of explore frames on mobile terminal receive 406 in proper order.Based on the calculating to one or more channel guess value matrixes, processor 282 can produce the mapping of a plurality of reception antennas to a plurality of received RF links.Based on the one or more channel guess value matrixes that calculated, can produce a day line options feedback information.

Therefore, available hardware of the present invention, software or software and hardware combining realize.The present invention can realize under the centralized environment of at least one computer system, also can realize under each element is distributed in the distributed environment of different interconnective computer systems.The equipment that the computer system of any kind of or other are suitable for carrying out the method for the invention all is fit to use the present invention.The example of software and hardware combining can be the general-purpose computing system that has certain computer program, but when being written into and moving this computer program, the may command computer system is carried out method of the present invention.

The present invention also can be built in the computer program, wherein comprises all properties that can realize the method for the invention, and can carry out these methods when it is loaded into computer system.Computer program in this context is meant any expression formula of the instruction set of writing with any language, code or symbol, can make the system that has the information processing function directly carry out specific function or carry out specific function after finishing following one or two: a) be converted to other Languages, code or symbol; B) regenerate with other form.

The present invention is described according to specific embodiment, but it will be understood by those skilled in the art that when not breaking away from the scope of the invention, can carry out various variations and be equal to replacement.In addition, for adapting to the specific occasion or the material of the technology of the present invention, can carry out many modifications and not break away from its protection range the present invention.Therefore, the present invention is not limited to specific embodiment disclosed herein, and comprises that all drop into the embodiment of claim protection range.

Claims (10)

1. method that transmits information in wireless communication system is characterized in that described method comprises:

Receive explore frame by a plurality of reception antennas;

Based on the described a plurality of explore frames that received, with one in described a plurality of reception antennas one of being mapped in a plurality of received wireless radio-frequency link signals;

Sky line options feedback information and/or channel condition information that emission calculates according to the described a plurality of explore frames that received.

2. method according to claim 1 is characterized in that, described a plurality of explore frames comprise the explore frame sequence.

3. method according to claim 2 is characterized in that, before receiving the described explore frame sequence of at least a portion, sends the request that is used to start the antenna option program.

4. method according to claim 3 is characterized in that, described request comprise repeat the indication.

5. method according to claim 4 is characterized in that, the described decision that repeats to indicate according in the described a plurality of explore frames that received repeats the explore frame in the described explore frame sequence.

6. method according to claim 5 is characterized in that, the different reception antenna combination of configuration is used to receive each described repetition explore frame from described a plurality of reception antennas.

7. system that transmits information in wireless communication system is characterized in that described system comprises:

At least one can receive the circuit of a plurality of explore frames by a plurality of reception antennas;

At least one processor is used for according to the described reception of described a plurality of explore frames one of described a plurality of reception antennas being mapped in a plurality of received wireless radio-frequency link signals one; With

Described at least one circuit is used to launch sky line options feedback information and/or the channel condition information that described reception calculated according to described a plurality of explore frames.

8. system according to claim 7 is characterized in that, described a plurality of explore frames comprise the explore frame sequence.

9. system according to claim 8 is characterized in that, described at least one circuit is used for sending the request that is used to start the antenna option program before receiving at least a portion explore frame.

10. system according to claim 9 is characterized in that, described request comprise repeat the indication.

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