CN102843156A

Movatterモバイル変換

Info

Publication number: CN102843156A
Application number: CN2012103030423A
Authority: CN
Inventors: 杨建坡; 徐雨来; 余嘉池; 曾文彬
Original assignee: Allwin Telecommunication Co Ltd
Current assignee: Allwin Telecommunication Co Ltd
Priority date: 2012-08-23
Filing date: 2012-08-23
Publication date: 2012-12-26
Anticipated expiration: 2032-08-23
Also published as: CN102843156B

Abstract

Description

Distributed emission system of a kind of digital microwave and method

Technical field

The present invention relates to a kind of microwave transmission system and method, distributed emission system of particularly a kind of digital microwave and method.

Background technology

Conventional digital tv and CMMB transmitter system (large-scale computer and minicomputer) be the most common, be close in unique networking mode is small-sized transmitter networking: be placed on indoor transmitter+cloth and be placed on the outdoor iron tower antenna and construct a system.The mode of another kind of less use is to be the coverage mode of digital microwave one holder one---1 corresponding 1 remote termination of near-end machine, realizes that through microwave antenna and outdoor unit with duplex channel remote information is mutual between the two.

Small-sized transmitter networking cover existed like the back not enough: A, install limitedly, because of exciter can't adapt to outdoor adverse circumstances and need to keep nearby manually control operation function, transmitter can only be installed in indoor; B, efficient is on the low side, and there is loss in transmission line between indoor host computer to the exterior aerial, and tens of meters length can lose 30% even more with output power of transmitter, and the installation electromagnetical conversion efficiency is low, take electricity, operation is uneconomical; C, networking are single, and traditional low power transmitter hardware group becomes that two exciters add single power amplifier or single exciter adds single power amplifier, and only be appropriate to common planar zone and cover, and complicated and high than the large area region networking cost.

And tradition adopts the small capacity double of a holder one coverage mode to reception type microwave transmitter, has also had following deficiency: A, the system hardware cost is high, operating cost is high; B, maintenance inconvenience, in case it is far and near terminal is launched any fault, long-range promptly out of hand.

Summary of the invention

In order to solve above-mentioned technical problem, the invention provides low, the easy to maintenance and distributed emission system of digital microwave efficiently of a kind of cost.The present invention also provides a kind of distributed launching technique of digital microwave efficiently that reaches easy to maintenance.

The technical solution adopted for the present invention to solve the technical problems is:

The distributed emission system of a kind of digital microwave; Comprise: near-end machine and many remote terminations; Said near-end machine comprises unit in the near-end unit room; The output of unit is connected with and many outer unit of a plurality of near-end unit rooms that remote termination is corresponding in the said near-end unit room; The output of the outer unit of said near-end unit room is connected with the near-end machine microwave antenna that is used for the launched microwave signal, and said remote termination comprises the remote termination microwave antenna that is used to receive microwave signal, and the output of said remote termination microwave antenna is connected with remote termination outdoor unit, remote termination indoor unit and antenna in turn.

Further; The unit comprises first supervisory circuit and intermediate-freuqncy signal splitter in the said near-end unit room; Said first supervisory circuit is connected with near-end MODEM, near-end GPS module, near-end digital intermediate frequency module respectively, be used to receive main with the master who transmits signal with exciter and be used to receive the subsequent use exciter of subsequent use transmission signal; The output of said main output and subsequent use exciter with exciter all passes through near-end digital intermediate frequency module and is connected with the input of intermediate-freuqncy signal splitter; The output of said intermediate-freuqncy signal splitter is connected with the outer unit of a plurality of near-end unit rooms respectively; The input of said near-end GPS module is connected with the near-end gps antenna, and said near-end MODEM is connected with near-end MODEM antenna, and the output of said near-end GPS module is connected with exciter and subsequent use exciter with main respectively.

Further; Said remote termination indoor unit comprises the 4th supervisory circuit and the 4th filter; Said the 4th supervisory circuit is connected with far-end MODEM, far-end GPS module, remote digital ifd module and second power amplifier module respectively; The output of said remote termination outdoor unit is connected with antenna through remote digital ifd module, second power amplifier module and the 4th filter successively; Said second power amplifier module also is connected with the input of remote digital ifd module through its coupling port; The input of said far-end GPS module is connected with the far-end gps antenna, and the output of said far-end GPS module is connected with the remote digital ifd module, and said far-end MODEM is connected with far-end MODEM antenna.

Further; Said near-end digital intermediate frequency module comprises first clock circuit and is used to switch the commutation circuit that transmits signal; The output of said commutation circuit is connected with first low noise amplifier, down-conversion mixer, first filter, first analog to digital converter, a FPGA and first digital to analog converter in turn; The output of said first digital to analog converter is connected with the intermediate-freuqncy signal splitter; A said FPGA also is connected with the first embedded OS controller, and the input of said down-conversion mixer also is connected with first local oscillation circuit, and the output of said first clock circuit is connected with first analog to digital converter, a FPGA and first local oscillation circuit respectively.

Further; Said remote digital ifd module comprises second analog to digital converter, second clock circuit, second low-converter and the 3rd analog to digital converter; The output of said remote termination outdoor unit is connected with the 2nd FPGA, second digital to analog converter, second upconverter and the 5th filter in turn through second analog to digital converter; The output of said the 5th filter is connected with second power amplifier module; The coupling port of input second power amplifier module of said second low-converter connects; The output of said second low-converter is connected with the 2nd FPGA through the 3rd analog to digital converter; Said the 2nd FPGA also is connected with the second embedded OS controller, and the input of said second upconverter also is connected with the 4th local oscillation circuit, and the output of said second clock circuit is connected with the 2nd FPGA, second digital to analog converter and the 4th local oscillation circuit respectively.

Further; The outer unit of said near-end unit room comprises second supervisory circuit and first upconverter; The input of said first upconverter is connected with the interior unit of near-end unit room; The output of said first upconverter is connected with first power amplifier module and second filter in turn; The output of said second filter is connected with near-end machine microwave antenna, and the input of said first upconverter also is connected with second local oscillation circuit, said second supervisory circuit respectively with the near-end unit room in unit, first upconverter and first power amplifier module be connected.

Further; Said remote termination outdoor unit comprises the 3rd supervisory circuit and the 3rd filter; The input of said the 3rd filter is connected with the remote termination microwave antenna; The output of said the 3rd filter is connected with second low noise amplifier and first low-converter in turn; The output of said first low-converter is connected with the remote termination indoor unit, and the input of said first low-converter also is connected with the 3rd local oscillation circuit, and said the 3rd supervisory circuit is connected with second low noise amplifier, first low-converter and remote termination indoor unit respectively.

The present invention solves another technical scheme that its technical problem adopts:

The distributed launching technique of a kind of digital microwave comprises:

The time synchronized of S1, realization near-end machine and many remote terminations;

S2, the radio frequency analog signal that will launch convert analog if signal to;

S3, with sending to the outer unit of near-end unit room behind the analog if signal demultiplexing;

S4, convert every road analog if signal to microwave signal, launch through near-end machine microwave antenna;

S5, remote termination microwave antenna receive microwave signal and convert thereof into the remote termination analog if signal;

S6, the remote termination analog if signal sent to the remote digital ifd module of remote termination indoor unit;

S7, launch through antenna after converting the remote termination analog if signal to the remote termination radio frequency analog signal.

Further, realize the time synchronized of near-end machine and many remote terminations among the said step S1, comprising:

A1, near-end machine send the test signal of near-end machine system time that has been exclusively used in the record of measuring time-delay, and are copied into a plurality ofly, send to many corresponding remote terminations;

A2, every remote termination acceptance test signal also send to after the remote digital ifd module confirms; Information that every remote termination is corresponding and remote termination system time are bundled in the test signal and generate marking signal, with marking signal successively through the 4th monitoring module, far-end MODEM after far-end MODEM antenna transmission go out;

A3, near-end machine receive many a plurality of marking signals that remote termination returns through near-end MODEM, send to near-end digital intermediate frequency module through first supervisory circuit;

A4, near-end digital intermediate frequency module are analyzed and are contrasted said a plurality of marking signals, draw maximum remote termination system time;

A5, transmission have been write down the adjustment signal of maximum remote termination system time to many remote terminations;

A6, many remote terminations receive the adjustment signal and the remote termination system time of correspondence are made as maximum remote termination system time;

Wherein, near-end machine system time refers to that the near-end machine is the system time of benchmark with the gps signal, and the remote termination system time refers to that remote termination is the system time of benchmark with the gps signal.

Further; The radio frequency analog signal that said step S2 will launch converts analog if signal to; It is specially: the radio frequency analog signal input near-end digital intermediate frequency module that will launch; Radio frequency analog signal is amplified successively, after down mixing, analog-to-digital conversion, digital mixing, digital filtering and the time-delay adjustment, carries out digital-to-analogue conversion again and become analog if signal;

Said step S7 launches through antenna after converting the remote termination analog if signal to the remote termination radio frequency analog signal; It is specially: after the remote termination analog if signal is handled through analog-to-digital conversion, digital filtering, time-delay adjustment and digital pre-distortion, launch through antenna after process digital-to-analogue conversion and frequency up-converted become the remote termination radio frequency analog signal again.

The invention has the beneficial effects as follows: the distributed emission system of a kind of digital microwave of the present invention; Through adopting digital intermediate frequency module, gps system and MODEM to realize the time-delay adjustment at near-end machine and remote termination, realize the diversity reception signal Synchronization of distinct coverage region to greatest extent, networking mode is flexible; Adopt unidirectional microwave transmission mode; Keeping under the prerequisite of precision, can realize corresponding many remote terminations of a near-end machine, cost is low, easy to maintenance and efficient.

Another beneficial effect of the present invention is: the distributed launching technique of a kind of digital microwave of the present invention; Through adopting digital intermediate frequency module, gps system and MODEM to realize the time-delay adjustment to transmitting signal at near-end machine and remote termination, realize the diversity reception signal Synchronization of distinct coverage region to greatest extent, networking mode is flexible; Adopt unidirectional microwave transmission mode; Keeping under the prerequisite of precision, can realize corresponding many remote terminations of a near-end machine, cost is low, easy to maintenance and efficient.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is described further.

Fig. 1 is the structured flowchart of the distributed emission system of a kind of digital microwave of the present invention;

Fig. 2 is the structured flowchart of unit in the near-end unit room among Fig. 1;

Fig. 3 is the structured flowchart of the remote termination indoor unit among Fig. 1;

Fig. 4 is the structured flowchart of the near-end digital intermediate frequency module among Fig. 2;

Fig. 5 is the structured flowchart of the remote digital ifd module among Fig. 3;

Fig. 6 is the structured flowchart of the outer unit of near-end unit room among Fig. 1;

Fig. 7 is the structured flowchart of the remote termination outdoor unit among Fig. 1;

Fig. 8 is the workflow diagram of the distributed launching technique of a kind of digital microwave of the present invention;

Fig. 9 is the detail flowchart of step S1 among Fig. 8;

Figure 10 is the Time delay measurement method sketch map of one embodiment of the invention.

Embodiment

For the ease of the description of hereinafter, at first provide following nominal definition:

CMMB (China Mobile Multimedia Broadcasting), China Mobile multimedia broadcasting;

GPS (Global Positioning System), global positioning system;

MODEM, the abbreviation of Modulator and Demodulator refers to modulator-demodulator;

FPGA (Field-Programmable Gate Array), field programmable gate array.

With reference to Fig. 1; The invention provides the distributed emission system of a kind of digital microwave; Comprise: near-end machine and many remote terminations; Said near-end machine comprises unit in the near-end unit room, and the output of unit is connected with and many outer unit of a plurality of near-end unit rooms that remote termination is corresponding in the said near-end unit room, and the output of the outer unit of said near-end unit room is connected with the near-end machine microwave antenna that is used for the launched microwave signal; Said remote termination comprises the remote termination microwave antenna that is used to receive microwave signal, and the output of said remote termination microwave antenna is connected with remote termination outdoor unit, remote termination indoor unit and antenna in turn.

Further as preferred embodiment; With reference to Fig. 2; The unit comprises first supervisory circuit and intermediate-freuqncy signal splitter in the said near-end unit room; Said first supervisory circuit is connected with near-end MODEM, near-end GPS module, near-end digital intermediate frequency module respectively, be used to receive main with the master who transmits signal with exciter and be used to receive the subsequent use exciter of subsequent use transmission signal; The output of said main output and subsequent use exciter with exciter all passes through near-end digital intermediate frequency module and is connected with the input of intermediate-freuqncy signal splitter, and the output of said intermediate-freuqncy signal splitter is connected the unit outward with a plurality of near-end unit rooms respectively, and the input of said near-end GPS module is connected with the near-end gps antenna; Said near-end MODEM is connected with near-end MODEM antenna, and the output of said near-end GPS module is connected with exciter and subsequent use exciter with main respectively.

Further as preferred embodiment; With reference to Fig. 3; Said remote termination indoor unit comprises the 4th supervisory circuit and the 4th filter; Said the 4th supervisory circuit is connected with far-end MODEM, far-end GPS module, remote digital ifd module and second power amplifier module respectively; The output of said remote termination outdoor unit is connected with antenna through remote digital ifd module, second power amplifier module and the 4th filter successively, and said second power amplifier module also is connected with the input of remote digital ifd module through its coupling port, and the input of said far-end GPS module is connected with the far-end gps antenna; The output of said far-end GPS module is connected with the remote digital ifd module, and said far-end MODEM is connected with far-end MODEM antenna.

Further as preferred embodiment; With reference to Fig. 4; Said near-end digital intermediate frequency module comprises first clock circuit and is used to switch the commutation circuit that transmits signal; The output of said commutation circuit is connected with first low noise amplifier, down-conversion mixer, first filter, first analog to digital converter, a FPGA and first digital to analog converter in turn; The output of said first digital to analog converter is connected with the intermediate-freuqncy signal splitter; A said FPGA also is connected with the first embedded OS controller, and the input of said down-conversion mixer also is connected with first local oscillation circuit, and the output of said first clock circuit is connected with first analog to digital converter, a FPGA and first local oscillation circuit respectively.

Further as preferred embodiment; With reference to Fig. 5; Said remote digital ifd module comprises second analog to digital converter, second clock circuit, second low-converter and the 3rd analog to digital converter; The output of said remote termination outdoor unit is connected with the 2nd FPGA, second digital to analog converter, second upconverter and the 5th filter in turn through second analog to digital converter; The output of said the 5th filter is connected with second power amplifier module; The coupling port of input second power amplifier module of said second low-converter connects, and the output of said second low-converter is connected with the 2nd FPGA through the 3rd analog to digital converter, and said the 2nd FPGA also is connected with the second embedded OS controller; The input of said second upconverter also is connected with the 4th local oscillation circuit, and the output of said second clock circuit is connected with the 2nd FPGA, second digital to analog converter and the 4th local oscillation circuit respectively.

Further as preferred embodiment; With reference to Fig. 6; The outer unit of said near-end unit room comprises second supervisory circuit and first upconverter; The input of said first upconverter is connected with the interior unit of near-end unit room, and the output of said first upconverter is connected with first power amplifier module and second filter in turn, and the output of said second filter is connected with near-end machine microwave antenna; The input of said first upconverter also is connected with second local oscillation circuit, said second supervisory circuit respectively with the near-end unit room in unit, first upconverter and first power amplifier module be connected.

Further as preferred embodiment; With reference to Fig. 7; Said remote termination outdoor unit comprises the 3rd supervisory circuit and the 3rd filter; The input of said the 3rd filter is connected with the remote termination microwave antenna, and the output of said the 3rd filter is connected with second low noise amplifier and first low-converter in turn, and the output of said first low-converter is connected with the remote termination indoor unit; The input of said first low-converter also is connected with the 3rd local oscillation circuit, and said the 3rd supervisory circuit is connected with second low noise amplifier, first low-converter and remote termination indoor unit respectively.

With reference to Fig. 8, the present invention also provides a kind of digital microwave distributed launching technique, comprising:

Further,, realize the time synchronized of near-end machine and many remote terminations among the said step S1, comprising with reference to Fig. 9 as preferred embodiment:

Further as preferred embodiment; The radio frequency analog signal that said step S2 will launch converts analog if signal to; It is specially: the radio frequency analog signal input near-end digital intermediate frequency module that will launch; Radio frequency analog signal is amplified successively, after down mixing, analog-to-digital conversion, digital mixing, digital filtering and the time-delay adjustment, carries out digital-to-analogue conversion again and become analog if signal;

Describe the signal processing flow of native system below in detail.

In the near-end unit room in the unit; The main radio frequency analog signal that transmits with exciter and subsequent use exciter gets into near-end digital intermediate frequency module, and at first the commutation circuit in near-end digital intermediate frequency module is selected the wherein appropriate signals of single channel, via first low noise amplifier small-signal is amplified again; Realize analog down through down-conversion mixer then; This moment, radio frequency analog signal converted analog if signal into, and analog if signal carries out analog-to-digital conversion through analog to digital converter, becomes digital medium-frequency signal; And be sent to a FPGA; It is baseband signal with its frequency conversion that the one FPGA carries out digital mixing to this digital medium-frequency signal, and this baseband signal is handled, and accomplishes signal processing control procedures such as digital framing, digital filtering, digital frequency-selecting, time-delay budget simultaneously.The digital medium-frequency signal of handling through a FPGA becomes analog if signal via first digital to analog converter and outputs to the intermediate-freuqncy signal splitter.Analog if signal is sent to unit outside the near-end unit room through microwave cable after in the intermediate-freuqncy signal splitter, being divided into multichannel.The multichannel here is generally the 2-8 road.

Every road analog if signal converts microwave signal in the unit outside the near-end unit room of correspondence; Launch through near-end machine microwave antenna at last; It is specially: analog if signal is through being up-converted into microwave signal, again through first power amplifier module amplify, second filter filtering after near-end machine microwave antenna launch.

The remote termination outdoor unit receives this microwave signal through the remote termination microwave antenna; Carry out filtering and forgo spurious signal in addition via the 3rd filter; Carrying out small-signal through second low noise amplifier then amplifies; Through first low-converter microwave signal is become the remote termination analog if signal again, at last this remote termination analog if signal is sent to the remote digital ifd module of remote termination indoor unit.

In the remote digital ifd module; This remote termination analog if signal converts digital medium-frequency signal into through second analog to digital converter earlier; In the 2nd FPGA, this digital medium-frequency signal is handled then; Accomplish digital signal and separate processes such as frame, digital filtering, digital frequency-selecting, time-delay adjustment, digital pre-distortion; Carry out digital-to-analogue conversion through second digital to analog converter again and become analog if signal, up-convert to the remote termination radio frequency analog signal to analog if signal via second upconverter afterwards, carry out after the filtering again amplifying, launching through antenna behind the 4th filter filtering through second power amplifier module through the 5th filter.

The realization of the predistortion function of remote termination: through the small-signal that is coupled out from the second power amplifier module output; Be back to second low-converter of remote digital ifd module; The remote termination radio frequency analog signal is become analog if signal; This analog if signal carries out analog-to-digital conversion through the 3rd analog to digital converter; Become digital medium-frequency signal, deliver among the 2nd FPGA again, the signal of in the 2nd FPGA, the source outdoor unit being brought is realized self adaptation waveform and phase place positioning with the input signal that is coupled from second power amplifier module by software algorithm; Promptly produce the precorrection input signal at the second power amplifier module front end at last, compensated the nonlinear distortion of second power amplifier module when signal amplifies.

In the native system; Because near-end machine can corresponding many remote terminations; The space transmission range of different remote termination to near-end machines is different will bring different transmission delays; Native system adopts and realizes system synchronization based on the automatic time delay compensation technique, eliminates the transmission delay that each remote termination to near-end machine produces because of space length differs.

Preferably, when the distributed emission system of a kind of digital microwave of the present invention adopted like the star-like networking mode of Figure 10, the Time delay measurement method was following:

The near-end machine sends one and is exclusively used in the test signal of measuring time-delay; Corresponding system time is T, and is copied into a plurality ofly, supposes to have 8; Be corresponding time T _ 1～T_N; T=T_1=T_2 ...=T_8, remote termination 1 receive that promptly there is real space transmission delay T1a in the test signal that arrives at through certain transmission delay, and this time can not directly measure; This signal confirms that through the remote digital ifd module this moment, corresponding system time was T1, and then has added the information and the record time-delay T1 of this TV station remote termination 1 for near-end machine feedback transmission marking signal, marking signal packing; Through far-end MODEM marking signal is returned the near-end MODEM to the near-end machine, through first supervisory circuit marking signal is sent to near-end digital intermediate frequency module again.Time-delay record main body is a near-end digital intermediate frequency module.The current time T1 of remote termination is:

T1=T_1+T1a+T1Δ=T+T1a+T1Δ

The T1 Δ is the additional delay of remote termination 1, refer to test signal after this section time-delay and remote termination 1 outdoor unit acceptance test signal are launched from first digital to analog converter unit to the near-end unit room outside in a FPGA of near-end digital intermediate frequency module output back to the 2nd FPGA this section time-delay before of importing in the remote digital ifd module.In star-like networking, the Tx Δ of each remote termination is a basically identical, i.e. T1 Δ ≈ T2 Δ ≈ T3 Δ ≈ T4 Δ ≈ T5 Δ ≈ T6 Δ ≈ T7 Δ ≈ T8 Δ.T1a～T8a is each remote termination reality because of the far and near different space transmission delays that produce of space transmission, i.e. T1a ≠ T2a ≠ T3a ≠ T4a ≠ T5a ≠ T6a ≠ T7a ≠ T8a.

As do not carry out synchronously, so when video terminal is positioned at the intersection region that different remote terminations cover; Then very likely occur: thus the somewhere receive a strong signal but overtime delay such as remote termination 5 signal and think by mistake be unwanted signal abandon this stronger useful signal (; But misjudgement has been disturbed the useful signal of more weak time-delay within thresholding for the strong signal of the remote termination 5 of unwanted signal; Like the useful signal of remote termination 6, the result causes this place to be disturbed, and can't carry out normal rating.

Each remote termination automatic time delay is adjusted in the star-like networking mode: it is maximum that the near-end machine is chosen numerical value among time-delay T1～T8, and for example the T5 of remote termination 5 is a benchmark with this numerical value, unified maximum all is arranged in the time-delay of each remote termination, i.e. the T5 of remote termination 5.Like this, promptly be adjusted into synchronously with regard to the total system signal through automatic time delay.

More than be that preferable enforcement of the present invention is specified; But the invention is not limited to said embodiment; Those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite of spirit of the present invention, modification that these are equal to or replacement all are included in the application's claim institute restricted portion.

Claims

1. distributed emission system of digital microwave; It is characterized in that; Comprise: near-end machine and many remote terminations; Said near-end machine comprises unit in the near-end unit room, and the output of unit is connected with and many outer unit of a plurality of near-end unit rooms that remote termination is corresponding in the said near-end unit room, and the output of the outer unit of said near-end unit room is connected with the near-end machine microwave antenna that is used for the launched microwave signal; Said remote termination comprises the remote termination microwave antenna that is used to receive microwave signal, and the output of said remote termination microwave antenna is connected with remote termination outdoor unit, remote termination indoor unit and antenna in turn.

2. the distributed emission system of a kind of digital microwave according to claim 1; It is characterized in that: the unit comprises first supervisory circuit and intermediate-freuqncy signal splitter in the said near-end unit room; Said first supervisory circuit is connected with near-end MODEM, near-end GPS module, near-end digital intermediate frequency module respectively, be used to receive main with the master who transmits signal with exciter and be used to receive the subsequent use exciter of subsequent use transmission signal; The output of said main output and subsequent use exciter with exciter all passes through near-end digital intermediate frequency module and is connected with the input of intermediate-freuqncy signal splitter; The output of said intermediate-freuqncy signal splitter is connected with the outer unit of a plurality of near-end unit rooms respectively; The input of said near-end GPS module is connected with the near-end gps antenna; Said near-end MODEM is connected with near-end MODEM antenna, and the output of said near-end GPS module is connected with exciter and subsequent use exciter with main respectively.

3. the distributed emission system of a kind of digital microwave according to claim 2; It is characterized in that: said remote termination indoor unit comprises the 4th supervisory circuit and the 4th filter; Said the 4th supervisory circuit is connected with far-end MODEM, far-end GPS module, remote digital ifd module and second power amplifier module respectively; The output of said remote termination outdoor unit is connected with antenna through remote digital ifd module, second power amplifier module and the 4th filter successively; Said second power amplifier module also is connected with the input of remote digital ifd module through its coupling port; The input of said far-end GPS module is connected with the far-end gps antenna, and the output of said far-end GPS module is connected with the remote digital ifd module, and said far-end MODEM is connected with far-end MODEM antenna.

4. the distributed emission system of a kind of digital microwave according to claim 3; It is characterized in that; Said near-end digital intermediate frequency module comprises first clock circuit and is used to switch the commutation circuit that transmits signal; The output of said commutation circuit is connected with first low noise amplifier, down-conversion mixer, first filter, first analog to digital converter, a FPGA and first digital to analog converter in turn; The output of said first digital to analog converter is connected with the intermediate-freuqncy signal splitter; A said FPGA also is connected with the first embedded OS controller, and the input of said down-conversion mixer also is connected with first local oscillation circuit, and the output of said first clock circuit is connected with first analog to digital converter, a FPGA and first local oscillation circuit respectively.

5. the distributed emission system of a kind of digital microwave according to claim 4; It is characterized in that: said remote digital ifd module comprises second analog to digital converter, second clock circuit, second low-converter and the 3rd analog to digital converter; The output of said remote termination outdoor unit is connected with the 2nd FPGA, second digital to analog converter, second upconverter and the 5th filter in turn through second analog to digital converter; The output of said the 5th filter is connected with second power amplifier module; The coupling port of input second power amplifier module of said second low-converter connects; The output of said second low-converter is connected with the 2nd FPGA through the 3rd analog to digital converter; Said the 2nd FPGA also is connected with the second embedded OS controller, and the input of said second upconverter also is connected with the 4th local oscillation circuit, and the output of said second clock circuit is connected with the 2nd FPGA, second digital to analog converter and the 4th local oscillation circuit respectively.

6. the distributed emission system of a kind of digital microwave according to claim 5; It is characterized in that: the outer unit of said near-end unit room comprises second supervisory circuit and first upconverter; The input of said first upconverter is connected with the interior unit of near-end unit room; The output of said first upconverter is connected with first power amplifier module and second filter in turn; The output of said second filter is connected with near-end machine microwave antenna, and the input of said first upconverter also is connected with second local oscillation circuit, said second supervisory circuit respectively with the near-end unit room in unit, first upconverter and first power amplifier module be connected.

7. the distributed emission system of a kind of digital microwave according to claim 6; It is characterized in that: said remote termination outdoor unit comprises the 3rd supervisory circuit and the 3rd filter; The input of said the 3rd filter is connected with the remote termination microwave antenna; The output of said the 3rd filter is connected with second low noise amplifier and first low-converter in turn; The output of said first low-converter is connected with the remote termination indoor unit, and the input of said first low-converter also is connected with the 3rd local oscillation circuit, and said the 3rd supervisory circuit is connected with second low noise amplifier, first low-converter and remote termination indoor unit respectively.

8. the distributed launching technique of digital microwave is characterized in that, comprising:

9. the distributed launching technique of a kind of digital microwave according to claim 8 is characterized in that, realizes the time synchronized of near-end machine and many remote terminations among the said step S1, comprising:

10. the distributed launching technique of a kind of digital microwave according to claim 8; It is characterized in that; The radio frequency analog signal that said step S2 will launch converts analog if signal to; It is specially: the radio frequency analog signal that will launch input near-end digital intermediate frequency module, and radio frequency analog signal is amplified successively, after mixing down, analog-to-digital conversion, digital mixing, digital filtering and the time-delay adjustment, carries out digital-to-analogue conversion again and become analog if signal;