CN106972911B - A kind of modulation-demodulation device of the burst scatter communication based on time diversity - Google Patents
A kind of modulation-demodulation device of the burst scatter communication based on time diversity Download PDFInfo
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- CN106972911B CN106972911B CN201710211219.XA CN201710211219A CN106972911B CN 106972911 B CN106972911 B CN 106972911B CN 201710211219 A CN201710211219 A CN 201710211219A CN 106972911 B CN106972911 B CN 106972911B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
- H04L27/364—Arrangements for overcoming imperfections in the modulator, e.g. quadrature error or unbalanced I and Q levels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3818—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/048—Speed or phase control by synchronisation signals using the properties of error detecting or error correcting codes, e.g. parity as synchronisation signal
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Abstract
The present invention discloses a kind of modulation-demodulation device of burst scatter communication based on time diversity, it is related to the modulation-demodulation device of burst signal timing extraction in scatter communication field, the processing of time diversity phase ambiguity.It is by assisting the components such as multiple/coupler, time burst diversity modulator, I/Q modulator (containing local oscillator and D/A converter module), bandpass filter, amplifier, A/D converter, time burst diversity demodulator, power supply to form.The present invention is using time diversity in such a way that frequency diversity combines, the modem of burst transfer system, single antenna scatter communication station diversity ability is substantially improved, while the power consumption of equipment can be greatly reduced, the portable scatter communication station design being very suitable under emergency communication background.And the present invention also has the characteristics that circuit structure is simple, integration degree is high, stable and reliable for performance, portable good, low in cost, and the communication system of lower detection threshold is required especially suitable for introducing efficient Error Correction of Coding.
Description
Technical field
The present invention discloses a kind of modulation-demodulation device of burst scatter communication based on time diversity, can eliminate time diversity
Phase ambiguity, rapidly extracting Timing Synchronization, especially suitable for the scatter communication system under the conditions of single antenna reception.
Background technique
Time diversity is a kind of effective anti-fading means, is effectively arranging for single antenna scattering system smoothed channel decline
It applies, but time diversity can bring the phase ambiguity for receiving timing, under burst transfer system, this influence is become apparent, and is not had
There is time enough for receiving the fuzzy judgement of timing phase, timing phase is caused to select mistake, the consequence of communication disruption.For
It solves the problems, such as this, introduces and originate, is normal, terminating the method that three sections of constructions extract burst transfer timing, directly extraction timing is believed
Number, it can avoid being timed phase ambiguity selection, eliminate influence of the link setup time delay to burst transfer scattering system.
Summary of the invention
It is an object of the invention to overcome the influence that time diversity timing phase is fuzzy under burst transfer system, one kind is provided
The modulation-demodulation device of burst scatter communication based on time diversity, can make scatter communication system be not required to long-time link setup time delay
Under the premise of to eliminate timing phase fuzzy, bring superior use value to burst scattering time diversity system, the present invention can
Realize there is that integration degree is high, small in size, portable good using digital device.
The object of the present invention is achieved like this:
A kind of modulation-demodulation device of the burst scatter communication based on time diversity, including assist multiple/coupler 1, IQ tune
Device 3, bandpass filter 4, intermediate frequency amplifier 5, A/D converter 6 and power supply 8 processed；It further include time burst diversity modulator 2 and prominent
Send out time diversity demodulator 7；The input port 1 for assisting multiple/coupler 1 receives externally input business datum, goes forward side by side
Row multiple connection processing, obtains multiple connection clock and multiple connection code stream, and the generation of business datum amount is aligned with multiple connection code stream based on the received
Multiple connection burst is enabled, passes through output port 2, output port 3 and defeated respectively for multiple connection clock, multiple connection code stream and multiple connection burst are enabled
Exit port 4 corresponds the input port 1, input port 2 and input port 3 of output to time burst diversity modulator 2；Burst
Time diversity modulator 2 makes the time diversity tune that can be carried out burst according to the burst of the multiple connection clock, multiple connection code stream and multiple connection of input
Waveform construction processed obtains the road I modulated signal, the road Q modulated signal, clock reference and control signal, by the road I modulated signal, the road Q tune
Signal, clock reference and control signal processed pass through output port 4, output port 5, output port 6 and output port 7 one by one respectively
It is correspondingly outputting to input port 1, input port 2, input port 3 and the input port 4 of I/Q modulator 3；I/Q modulator 3 according to when
The road I modulated signal and the road Q modulated signal are carried out orthogonal modulation by clock reference and control signal, obtain modulated intermediate frequency signal, will in
Frequency modulation is exported by output port 5 to the input port 1 of bandpass filter 4；Bandpass filter 4 is by modulated intermediate frequency signal
It carries out with outer filtering, filtered modulated intermediate frequency signal is exported by output port 2；Intermediate frequency amplifier 5 passes through input port 1
Received IF signal outside receiving, is compensated automatically according to the level of received IF signal, obtains the intermediate frequency of level equalization
Signal is received, the received IF signal of level equalization is exported by output port 2 to the input port 1 of A/D converter 6；A/D
The received IF signal of the level equalization of 6 pairs of converter inputs carries out bandpass sampling, forms the wide digital sampled signal of multidigit, and
Digital sampled signal is exported by output port 2 to the input port 1 of time burst diversity demodulator 7；Time burst diversity
Demodulator 7 obtains tap clock, tap code stream and tap burst to digital sampled signal progress demodulation process and enables, and will tap
Clock, tap code stream and enabled output port 2, output port 3 and the output port 4 of passing through respectively of tap burst correspond output
To input port 5, input port 6 and the input port 7 for assisting multiple/coupler 1；Auxiliary is multiple/coupler 1 according to tap clock,
Tap code stream and tap burst enable to recover business information, and business information is exported by output port 8.
Wherein, time burst diversity modulator 2 include LDPC coding module 9, it is time diversity codeword delay module 10, double
Time diversity code construction module 11, quadruple frequency diversity molding modulation module 12 and burst modulation signal control module 13；Institute
Input port 1, input port 2 and the input port 3 for the LDPC coding module 9 stated correspond reception respectively and assist multiple/tap
Multiple connection clock, multiple connection code stream and the multiple connection burst that device 1 exports are enabled, and LDPC coding module 9 is according to the multiple connection clock of input and multiple
It is enabled to multiple connection code stream progress block coding to connect burst, the enable signal after code stream and coding after generating coding, after coding
Code stream is exported respectively by output port 4 to the input port 1 of time diversity codeword delay module 10 and double time diversity code
The input port 1 of word constructing module 11；Enable signal after coding is exported respectively by output port 5 to time diversity code word
The input port 2 of the input port 2 of Postponement module 10 and double time diversity code construction module 11；LDPC coding module 9
It happens suddenly to enable to generate according to multiple connection and sends useful signal, which is exported by output port 6 to burst modulation letter
The input port 1 of number control module 13；Time diversity codeword delay module 10 will be after coding according to the enable signal after coding
The delay of time is fixed in code stream, the time diversity code stream after being delayed, and the time diversity code stream after delay is passed through
Output port 3 is exported to the input port 3 of double time diversity code construction module 11；Double time diversity code construction module
11 are aligned the code stream after coding with the time diversity code stream after delay, and when being configured to double according to the enable signal after coding
Between diversity base band code stream with match enabled, the base band code stream of double time diversity is enabled to pass through output port respectively with matching
4 and output port 5 correspond output to quadruple frequency diversity molding modulation module 12 input port 1 and input port 2；Four
Weight frequency diversity, which forms modulation module 12, makes the base band code stream that can control double time diversity according to matching, generates the road I of burst
Modulated signal, the road Q modulated signal and clock reference, and the road I modulated signal, the road Q modulated signal and clock reference are passed through respectively
Output port 3, output port 4 and output port 5 correspond input port 1, input port 2 and of the output to I/Q modulator 3
Input port 3；Burst modulation signal control module 13 generates the control signal of burst modulation according to the transmission useful signal of input,
Signal will be controlled to export by output port 3 to the input port 4 of I/Q modulator 3.
Wherein, time burst diversity demodulator 7 includes A/D sampled signal Postponement module 14, the one or four branch down coversion mould
Block 15-1, the two or four branch down conversion module 15-2, timing signal down conversion module 16, burst signal timing extraction module 17,
Eight branch DAR demodulation modules 18, four phase frame synchronous ssearching modules 19 and LDPC decoding module 20；The A/D sampled signal
The input port 1 of Postponement module 14 receives the digital sampled signal that the output port 2 of A/D converter 6 exports, and digital sample is believed
It number is fixed delay process, and received digital sampled signal and digital sampled signal by constant time lag processing is carried out
Symbol aligned exports the digital sampled signal after symbol aligned respectively to the one or four branch down coversion mould by output port 2
The input port 1 of block 15-1 and the input port 1 of timing signal down conversion module 16；By the process constant time lag after symbol aligned
The digital sampled signal of processing is exported respectively by output port 3 to the input port 1 of the two or four branch down conversion module 15-2
With the input port 2 of timing signal down conversion module 16；One or four branch down conversion module 15-1 is by the number after symbol aligned
Sampled signal downconverts to zero-frequency, forms the baseband signal of four branches, and the baseband signal of four branches is passed through output respectively
Port 2, output port 3, output port 4 and output port 5 correspond the input terminal of output to eight branch DAR demodulation modules 18
Mouth 1, input port 2, input port 3 and input port 4；Two or four branch down conversion module 15-2 is by the process after symbol aligned
The digital sampled signal of delay downconverts to zero-frequency, forms the baseband signal of four branches, by the baseband signal of four branches point
Not Tong Guo output port 2, output port 3, output port 4 and output port 5 correspond output to eight branch DAR demodulation modules
18 input port 5, input port 6, input port 7 and input port 8；Eight branch DAR demodulation modules 18 are according to having eliminated phase
When the fuzzy timing signal in position demodulates the baseband signal progress DAR of 8 branches to obtain demodulation clock with demodulating code stream, and will demodulate
Clock and demodulation code stream pass through output port 9 respectively and output port 10 corresponds output to four phase frame synchronous ssearching modules 19
Input port 1 and input port 2；Four phase frame synchronous ssearching modules 19 carry out demodulation code stream according to the demodulation clock of input
The frame synchronous ssearching of four phases, completion go phase ambiguity to handle, and obtain piecemeal code stream, piecemeal clock and piecemeal burst and enable,
The burst of piecemeal code stream, piecemeal clock and piecemeal is enabled a pair of by output port 3, output port 4 and output port 5 one respectively
It should export to the input port 1, input port 2 and input port 3 of LDPC decoding module 20, and according to the frame search of demodulation code stream
Situation judges the position that burst signal starts and terminates, and burst signal is started to export with the position terminated by output port 6
To the input port 3 of burst signal timing extraction module 17；Timing signal down conversion module 16 adopts the number after symbol aligned
The digital sampled signal by delay after sample signal and symbol aligned carries out down-converted, obtains the envelope signal of timing,
The envelope signal of timing is exported by output port 3 to the input port 1 of burst signal timing extraction module 17；Burst signal
Timing extraction module 17 starts to generate with the position terminated according to the envelope signal and burst signal of timing has eliminated phase ambiguity
Timing signal will eliminate phase ambiguity timing signal and pass through the input of the output of output port 2 to eight branch DAR demodulation modules 18
Port 11；LDPC decoding module 20 to piecemeal code stream, piecemeal clock and piecemeal burst make to can be carried out decoding, obtain tap clock,
Tap code stream and tap burst be enabled, and will tap clock, tap code stream and tap burst it is enabled respectively by output port 4,
Output port 5 and output port 6 correspond output to input port 5, input port 6 and the input terminal for assisting multiple/coupler 1
Mouth 7.
The present invention has the following advantages over the background art:
1. the time burst diversity modulator 2 that the present invention uses constructs opening for link establishment according to the presence or absence of burst service
Show, normally, terminated for three stages, normal timing signal transferred out in such a way that enlightenment inhibits, for without accumulating phase selection
Position provides feasibility.
2. full symbol proposes timing when the time burst diversity demodulator 7 that the present invention uses is using no signal, there is opening for signal
Window filters the mode of wrong phase, ensure that from signal to the signal end of transmission is received be not in that timing phase is fuzzy, is fast
Run-up chain is laid a good foundation.
3. building block of the invention is made of extensive field programmable device, therefore can be by configuring different journeys
The modification to running parameter is neatly realized in sequence, greatly simplifies structure, and cost significantly reduces.
4. integration degree is high by the present invention, therefore small in size, light-weight, stable and reliable for performance, portable good, maintenance side
Just, equipment maneuverability and portable ability significantly improve.
Detailed description of the invention
Fig. 1 is electrical schematic block diagram of the invention.
Fig. 2 is the electrical schematic diagram of 2 embodiment of time burst diversity modulator.
Fig. 3 is the electrical schematic diagram of 7 embodiment of time burst diversity demodulator.
Specific embodiment
Referring to figs. 1 to Fig. 3, the present invention includes assisting multiple/coupler 1, time burst diversity modulator 2, I/Q modulator 3
(containing local oscillator and D/A converter module), bandpass filter 4, intermediate frequency amplifier 5, A/D converter 6, time burst diversity demodulator 7
With power supply 8.Fig. 1 is electrical schematic block diagram of the invention, and embodiment presses Fig. 1 connection line.Assist the input terminal of multiple/coupler 1
Mouth 1 receives externally input business datum, and carries out multiple connection processing, obtains multiple connection clock and multiple connection code stream, and based on the received
Business datum amount generates the multiple connection burst being aligned with multiple connection code stream and enables, and multiple connection clock, multiple connection code stream and multiple connection is happened suddenly enabled
The input of output to time burst diversity modulator 2 is corresponded by output port 2, output port 3 and output port 4 respectively
Port 1, input port 2 and input port 3；The effect of time burst diversity modulator 2 is double to the code stream progress after multiple connection
The construction of time diversity quadruple frequency diversity, and not for the enlightenment of burst characteristic setting link establishment, normal, three stages of end
Same structural form；Time burst diversity modulator 2 makes can be carried out prominent according to the burst of the multiple connection clock, multiple connection code stream and multiple connection of input
The time diversity modulation waveform of hair constructs, and the road I modulated signal, the road Q modulated signal, clock reference and control signal is obtained, by the road I
Modulated signal, the road Q modulated signal, clock reference and control signal pass through output port 4, output port 5, output port 6 respectively
Output is corresponded to the input port 1 of I/Q modulator 3, input port 2, input port 3 and input port 4 with output port 7；
The road I modulated signal and the road Q modulated signal carry out orthogonal modulation according to clock reference and control signal by I/Q modulator 3, obtains
Modulated intermediate frequency signal is exported by output port 5 to the input port 1 of bandpass filter 4, is converted comprising DA by frequency modulation
The link generated with local oscillator；Bandpass filter 4 carries out modulated intermediate frequency signal with outer filtering, by filtered modulated intermediate frequency signal
It is exported by output port 2；Intermediate frequency amplifier 5 receives external received IF signal by input port 1, according to medium frequency reception
The level of signal is compensated automatically, obtains the received IF signal of level equalization, and the received IF signal of level equalization is led to
Cross the input port 1 of the output of output port 2 to A/D converter 6；The medium frequency reception letter of the level equalization of 6 pairs of A/D converter inputs
Number bandpass sampling is carried out, forms the wide digital sampled signal of multidigit, primary frequency transformation can be saved, it need be it is to be noted that cannot go out
Existing spectral aliasing, and digital sampled signal is exported by output port 2 to the input port 1 of time burst diversity demodulator 7；
Time burst diversity demodulator 7 carries out demodulation process to digital sampled signal and obtains tap clock, tap code stream and tap burst
It is enabled, and it is enabled respectively by output port 2, output port 3 and output port to tap clock, tap code stream and tap burst
4 correspond output to input port 5, input port 6 and the input port 7 for assisting multiple/coupler 1；Assist multiple/coupler 1
It enables to recover business information according to tap clock, tap code stream and tap burst, business information is defeated by output port 8
Out.
The U.S. Altera for assisting multiple/tap 1, time burst diversity modulator 2, time burst diversity demodulator 7 to use
Company produces StratixII Series FPGA chip manufacturing.I/Q modulator is public using U.S. A/D containing local oscillator and D/A converter module 3
The AD9788 integrated chip production of department's production.Bandpass filter 4 uses the SBP70-35 chip manufacturing of Chengdu Tian Zhi company.In
Audio amplifier 5 is made of the AD8367 integrated chip of A/D company, two panels U.S. production.6 A/D company, the U.S. of A/D converter is raw
The AD9218 integrated chip of production makes.
The effect of time burst diversity modulator 2 of the present invention is the burst service according to input, constructs the two of burst transfer
Weight time diversity combination quadruple frequency diverse signals, the enlightenment stage only sends a heavy time diversity signal, reaches between time diversity
Switch to normal output after, shutdown signal exports when the business end of transmission, and thus having constructed can pass according to continuous symbol
Defeated time diversity signal.It is by LDPC coding module 9, time diversity codeword delay module 10, double time diversity code word structure
Modeling block 11, quadruple frequency diversity molding modulation module 12 and burst modulation signal control module 13 form.Fig. 2 is base of the present invention
The electrical schematic diagram of time burst diversity modulator 2, embodiment press Fig. 2 connection line.The input terminal of the LDPC coding module 9
Mouth 1, input port 2 and input port 3 correspond respectively receives the multiple connection clock for assisting multiple/coupler 1 to export, multiple connection code stream
Enabled with multiple connection burst, LDPC coding module 9 enables to carry out block to multiple connection code stream according to the multiple connection clock of input and multiple connection burst
Coding, generate coding after code stream and coding after enable signal, by the code stream after coding by output port 4 export respectively to
The input port 1 of the input port 1 of time diversity codeword delay module 10 and double time diversity code construction module 11；It will compile
Enable signal after code is exported respectively by output port 5 to the input port 2 of time diversity codeword delay module 10 and double
The input port 2 of time diversity code construction module 11；LDPC coding module 9, which happens suddenly to enable to generate according to multiple connection, sends effectively letter
Number, and useful signal will be sent and exported by output port 6 to the input port 1 of burst modulation signal control module 13；Time
The delay of time is fixed according to the enable signal after coding by diversity code word Postponement module 10 for code stream after coding, is prolonged
When after time diversity code stream, and the time diversity code stream after delay is exported by output port 3 to double time diversity code
The input port 3 of word constructing module 11；Double time diversity code construction module 11 by the code stream after coding and after delay when
Between diversity code stream be aligned, and the base band code stream of double time diversity is configured to according to the enable signal after coding and is enabled with matching,
The base band code stream of double time diversity is exported extremely with enabled correspond respectively by output port 4 and output port 5 is matched
The input port 1 and input port 2 of quadruple frequency diversity molding modulation module 12；Quadruple frequency diversity forms modulation module 12
Effect is that quadruple frequency diversity constructs when having business according to the completion of burst service situation, and shutdown signal exports when no business, quadruple
Frequency diversity, which forms modulation module 12, makes the base band code stream that can control double time diversity according to matching, generates the road the I tune of burst
Signal, the road Q modulated signal and clock reference processed, and the road I modulated signal, the road Q modulated signal and clock reference passed through respectively defeated
Exit port 3, output port 4 and output port 5 correspond output to the input port 1 of I/Q modulator 3, input port 2 and defeated
Inbound port 3；Burst modulation signal control module 13, will according to the control signal for sending useful signal and generating burst modulation of input
Signal is controlled to export by output port 3 to the input port 4 of I/Q modulator 3.
Embodiment LDPC coding module 9, time diversity codeword delay module 10, double time diversity code construction module
11, quadruple frequency diversity molding modulation module 12 and burst modulation signal control module 13 are all made of same U.S. Altera public affairs
Department's production StratixII Series FPGA chip manufacturing.
The effect of time burst diversity demodulator 7 of the present invention is gone forward side by side according to burst transfer system rapidly extracting timing signal
The DAR demodulation that row multiple branch circuit merges, after removing phase ambiguity, carries out LDPC block decoding, recovers the demodulation code stream of burst.It by
A/D sampled signal Postponement module 14, the one or four branch down conversion module 15-1, the two or four branch down conversion module 15-2, timing
Signal down conversion module 16, burst signal timing extraction module 17, eight branch DAR demodulation modules 18, four phase frame synchronous ssearchings
Module 19, LDPC decoding module 20 form, and Fig. 3 is the electrical schematic diagram of time burst diversity demodulator 7 of the present invention, and embodiment is by figure
3 connection lines.The output port 2 that the input port 1 of the A/D sampled signal Postponement module 14 receives A/D converter 6 exports
Digital sampled signal, digital sampled signal is fixed delay process, and by received digital sampled signal and by solid
The digital sampled signal for determining delay process carries out symbol aligned, and the digital sampled signal after symbol aligned is passed through output port 2
The input port to the input port 1 of the one or four branch down conversion module 15-1 and timing signal down conversion module 16 is exported respectively
1；The digital sampled signal handled by constant time lag after symbol aligned is exported respectively by output port 3 to the two or four
The input port 1 of road down conversion module 15-2 and the input port 2 of timing signal down conversion module 16；One or four branch down coversion
Digital sampled signal after symbol aligned is downconverted to zero-frequency by module 15-1, forms the baseband signal of four branches, by four
The baseband signal of branch passes through output port 2, output port 3, output port 4 and output port 5 respectively and corresponds output extremely
Input port 1, input port 2, input port 3 and the input port 4 of eight branch DAR demodulation modules 18；Become under two or four branch
The digital sampled signal by delay after symbol aligned is downconverted to zero-frequency by frequency module 15-2, forms the base band of four branches
The baseband signal of four branches is passed through output port 2, output port 3, output port 4 and output port 5 one by one by signal respectively
It is correspondingly outputting to input port 5, input port 6, input port 7 and the input port 8 of eight branch DAR demodulation modules 18；Eight
Road DAR demodulation module 18 is solved according to having eliminated phase ambiguity timing signal for the baseband signal of 8 branches and carry out DAR to demodulate
Timing clock and demodulation code stream, each branch is all made of coherent demodulation, and demodulation clock and demodulation code stream are passed through output port 9 respectively
The input port 1 and input port 2 of output to four phase frame synchronous ssearching modules 19 are corresponded with output port 10；Four phases
Frame synchronous ssearching module 19 carries out the frame synchronous ssearching of four phases according to the demodulation clock of input to demodulation code stream, and phase is gone in completion
Position Fuzzy Processing obtains piecemeal code stream, piecemeal clock and piecemeal burst and enables, piecemeal code stream, piecemeal clock and piecemeal are happened suddenly
It is enabled that the input of output to LDPC decoding module 20 is corresponded by output port 3, output port 4 and output port 5 respectively
Port 1, input port 2 and input port 3, and according to the frame search situation of demodulation code stream, judge that burst signal starts and terminates
Position, burst signal is started with the position that terminates through the output of output port 6 to burst signal timing extraction module 17
Input port 3；Timing signal down conversion module 16 prolongs the process after the digital sampled signal and symbol aligned after symbol aligned
When digital sampled signal carry out down-converted, obtain the envelope signal of timing, the envelope signal of timing passed through into output end
Mouth 3 is exported to the input port 1 of burst signal timing extraction module 17；Burst signal timing extraction module 17 is according to the packet of timing
Network signal and burst signal, which start to generate with the position terminated, has eliminated phase ambiguity timing signal, will eliminate phase ambiguity and has determined
When signal by output port 2 export to eight branch DAR demodulation modules 18 input port 11；LDPC decoding module 20 is to piecemeal
Code stream, piecemeal clock and piecemeal, which happen suddenly, to be made to can be carried out decoding, is obtained tap clock, tap code stream and tap burst and is enabled, and will
Clock, tap code stream and tap burst is tapped to enable to correspond by output port 4, output port 5 and output port 6 respectively
Output extremely assists the input port 5, input port 6 and input port 7 of multiple/coupler 1.
The effect of burst signal timing extraction module 17 is that the signal provided according to four phase frame synchronous ssearching modules 19 has
The label of nothing is extracted in the enlightenment stage of burst signal using full Symbol Timing, and confirmation signal, which receives, opens filter window, is inhibited
Another path timing signal occurred after falling thus can extract stable timing, and there is no timing phases to obscure.Eight branches
The effect of DAR demodulation module 18 is the Maximal ratio combiner for completing eight tributary signals, and each branch is all made of coherent demodulation.Four phases
The effect of position frame synchronous ssearching module 19 is matched entirely according to four possible Fuzzy Phases, searches for frame header position, and will
Eliminate the code word output of phase ambiguity.The effect of LDPC decoding module 20 is the block decoding that soft value is carried out to the information of input.It is real
It applies an A/D sampled signal Postponement module 14, four branch down conversion module 15-1 to 15-2, timing signal down conversion module 16, dash forward
Signalling timing extraction module 17, eight branch DAR demodulation modules 18, four phase frame synchronous ssearching modules 19, LDPC decoding module
20 are all made of altera corp, same U.S. production StratixII Series FPGA chip manufacturing.
Power supply 8 of the present invention provides the direct-current working volts of each component, and embodiment uses commercially available general integrated direct current of voltage regulation
Source block production, output+V voltage are+3.3V, supply current 2.0A.
The brief working principle of the present invention is as follows:
It is an object of the invention to overcome the influence that time diversity timing phase is fuzzy under burst transfer system, one kind is provided
The modulation-demodulation device of burst scatter communication based on time diversity, can make scatter communication system be not required to long-time link setup time delay
Under the premise of to eliminate timing phase fuzzy, bring superior use value to burst scattering time diversity system.Assist again/point
The effect for connecing device 1 is to complete the process of the burst service A multiple connection to input, and the data flow that demodulator restores is tapped out and is exported
Business Stream B.The effect of time burst diversity modulator 2 is to carry out double time diversity quadruple frequency diversity to the code stream after multiple connection
Construction, and for the enlightenment of burst characteristic setting link establishment, it is normal, terminate three stage different configuration forms.I/Q modulator 3
Effect be complete by the baseband digital signal of IQ to formulate intermediate frequency up-conversion process, comprising DA conversion with local oscillator generate ring
Section.Intermediate frequency amplifier 5 carries out automatic gain adjustment to received IF signal D, guarantees that A/D sampling is in suitable level range.
A/D converter 6 carries out bandpass sampling, can save primary frequency transformation, need be it is to be noted that there can be no spectral aliasings.When burst
Between diversity demodulator 7 burst signal the enlightenment stage using full Symbol Timing extract, then windowing filter out influence timing phase
Another way signal, ensure that time burst diversity signal Timing Synchronization rapidly extracting in this way, then carry out time diversity letter
Number demodulation, phase ambiguity eliminate, LDPC block decoding restore code stream.
Mounting structure of the present invention is as follows:
Fig. 1, into Fig. 3, all circuit devcies are produced by Fig. 1 to Fig. 3 connection line by a piece of altera corp, the U.S.
Stratix Series FPGA chip realizes that being mounted on one piece of length and width is respectively to pacify in printed board in the printed board of 115 × 200mm
The input of dress business, the cable socket of output port A, B and intermediate frequency output, the cable socket for receiving signal C, D, assembling cost hair
It is bright.
Claims (1)
1. a kind of modulation-demodulation device of the burst scatter communication based on time diversity, including assist multiple/coupler (1), IQ tune
Device (3), bandpass filter (4), intermediate frequency amplifier (5), A/D converter (6) and power supply (8) processed；It is characterized in that, further including dashing forward
Send out time diversity modulator (2) and time burst diversity demodulator (7)；The auxiliary is multiple/input port 1 of coupler (1)
Externally input business datum is received, and carries out multiple connection processing, obtains multiple connection clock and multiple connection code stream, and business based on the received
Data volume generates the multiple connection burst being aligned with multiple connection code stream and enables, and multiple connection clock, multiple connection code stream and multiple connection are happened suddenly and enable difference
The input terminal of output to time burst diversity modulator (2) is corresponded by output port 2, output port 3 and output port 4
Mouth 1, input port 2 and input port 3；Time burst diversity modulator (2) is according to the multiple connection clock of input, multiple connection code stream and answers
Connecing burst makes the time diversity modulation waveform construction that can be carried out burst, obtains the road I modulated signal, the road Q modulated signal, clock reference
With control signal, the road I modulated signal, the road Q modulated signal, clock reference and control signal are passed through into output port 4, output respectively
Port 5, output port 6 and output port 7 correspond output to the input port 1 of I/Q modulator (3), input port 2, input
Port 3 and input port 4；I/Q modulator (3) is according to clock reference and controls signal for the road I modulated signal and the road Q modulated signal
Orthogonal modulation is carried out, modulated intermediate frequency signal is obtained, modulated intermediate frequency signal is exported by output port 5 to bandpass filter (4)
Input port 1；Modulated intermediate frequency signal lead to filtered modulated intermediate frequency signal with outer filtering by bandpass filter (4)
Cross the output of output port 2；
Intermediate frequency amplifier (5) receives external received IF signal by input port 1, according to the level of received IF signal into
The automatic compensation of row, obtains the received IF signal of level equalization, and the received IF signal of level equalization is defeated by output port 2
Out to the input port 1 of A/D converter (6)；A/D converter (6) carries out band to the received IF signal of the level equalization of input
Logical sampling forms the wide digital sampled signal of multidigit, and digital sampled signal is exported by output port 2 to time burst point
Collect the input port 1 of demodulator (7)；Time burst diversity demodulator (7) carries out demodulation process to digital sampled signal and is divided
It connects clock, tap code stream and tap burst to enable, and enables tap clock, tap code stream and tap burst to pass through output respectively
Port 2, output port 3 and output port 4 correspond output to input port 5, the input port 6 for assisting multiple/coupler (1)
With input port 7；It assists again/coupler (1) to be happened suddenly according to tap clock, tap code stream and tap and enables to recover business letter
Breath exports business information by output port 8；
Wherein, the time burst diversity modulator (2) includes LDPC coding module (9), time diversity codeword delay module
(10), double time diversity code construction module (11), quadruple frequency diversity molding modulation module (12) and burst modulation signal
Control module (13)；One a pair of input port 1, input port 2 and the difference of input port 3 of the LDPC coding module (9)
It is enabled that the multiple connection clock, multiple connection code stream and multiple connection burst for assisting multiple/coupler (1) output should be received, LDPC coding module (9) root
It is enabled to multiple connection code stream progress block coding according to the multiple connection clock of input and multiple connection burst, after the code stream and coding after generating coding
Enable signal exports the code stream after coding respectively to the input of time diversity codeword delay module (10) by output port 4
The input port 1 of port 1 and double time diversity code construction module (11), passes through output port for the enable signal after coding
5 export respectively to the input port 2 of time diversity codeword delay module (10) and double time diversity code construction module (11)
Input port 2；LDPC coding module (9), which happens suddenly to enable to generate according to multiple connection, sends useful signal, and will send useful signal
Pass through the input port 1 of the output of output port 6 to burst modulation signal control module (13)；Time diversity codeword delay module
(10) code stream after coding is fixed to the delay of time, the time diversity after being delayed according to the enable signal after coding
Code stream, and the time diversity code stream after delay is exported by output port 3 to double time diversity code construction module (11)
Input port 3；Double time diversity code construction module (11) is by the code stream after coding and the time diversity code stream after delay
Alignment, and the base band code stream of double time diversity is configured to according to the enable signal after coding and is enabled with matching, by the double time
The base band code stream of diversity is exported with enabled correspond respectively by output port 4 and output port 5 is matched to quadruple frequency point
The input port 1 and input port 2 of integrated-type modulation module (12)；Quadruple frequency diversity forms modulation module (12) according to matching
Make the base band code stream that can control double time diversity, generates the road I modulated signal, the road Q modulated signal and the clock reference of burst, and
The road I modulated signal, the road Q modulated signal and clock reference are passed through into output port 3, output port 4 and output port 5 one by one respectively
It is correspondingly outputting to the input port 1, input port 2 and input port 3 of I/Q modulator (3)；Burst modulation signal control module
(13) according to the control signal for sending useful signal and generating burst modulation of input, control signal is exported by output port 3
To the input port 4 of I/Q modulator (3)；
Wherein, the time burst diversity demodulator (7) includes under A/D sampled signal Postponement module (14), the one or four branch
Frequency-variable module (15-1), the two or four branch down conversion module (15-2), timing signal down conversion module (16), burst signal timing
Extraction module (17), eight branch DAR demodulation modules (18), four phase frame synchronous ssearching modules (19) and LDPC decoding module
(20)；The output port 2 that the input port 1 of the A/D sampled signal Postponement module (14) receives A/D converter (6) exports
Digital sampled signal, digital sampled signal is fixed delay process, and by received digital sampled signal and by solid
The digital sampled signal for determining delay process carries out symbol aligned, and the digital sampled signal after symbol aligned is passed through output port 2
The input to the input port 1 of the one or four branch down conversion module (15-1) and timing signal down conversion module (16) is exported respectively
Port 1；The digital sampled signal handled by constant time lag after symbol aligned is exported respectively by output port 3 to second
The input port 1 of four branch down conversion modules (15-2) and the input port 2 of timing signal down conversion module (16)；One or four
Digital sampled signal after symbol aligned is downconverted to zero-frequency by road down conversion module (15-1), forms the base band letter of four branches
Number, it is a pair of that the baseband signal of four branches is passed through into output port 2, output port 3, output port 4 and output port 5 one respectively
It should export to input port 1, input port 2, input port 3 and the input port 4 of eight branch DAR demodulation modules (18)；Second
The digital sampled signal by delay after symbol aligned is downconverted to zero-frequency by four branch down conversion modules (15-2), forms four
The baseband signal of four branches is passed through output port 2, output port 3,4 and of output port by the baseband signal of a branch respectively
Output port 5 corresponds the input port 5, input port 6,7 and of input port of output to eight branch DAR demodulation modules (18)
Input port 8；Eight branch DAR demodulation modules (18) basis has eliminated phase ambiguity timing signal for the baseband signal of 8 branches
It carries out DAR and demodulates to obtain demodulation clock and demodulation code stream, and demodulation clock and demodulation code stream are passed through into output port 9 and defeated respectively
Exit port 10 corresponds the input port 1 and input port 2 of output to four phase frame synchronous ssearching modules (19)；Four phase frames
Synchronous search module (19) carry out the frame synchronous ssearching of four phases according to the demodulation clock of input to demodulation code stream, and phase is gone in completion
Position Fuzzy Processing obtains piecemeal code stream, piecemeal clock and piecemeal burst and enables, piecemeal code stream, piecemeal clock and piecemeal are happened suddenly
It is enabled to pass through the defeated of output port 3, output port 4 and the output of the one-to-one correspondence of output port 5 to LDPC decoding module (20) respectively
Inbound port 1, input port 2 and input port 3, and according to the frame search situation of demodulation code stream, judge that burst signal starts and ties
The position of beam starts burst signal to pass through the output of output port 6 to burst signal timing extraction module with the position terminated
(17) input port 3；After timing signal down conversion module (16) is to the digital sampled signal and symbol aligned after symbol aligned
By delay digital sampled signal carry out down-converted, obtain the envelope signal of timing, the envelope signal of timing led to
Cross the input port 1 of the output of output port 3 to burst signal timing extraction module (17)；Burst signal timing extraction module (17)
Start to generate with the position terminated according to the envelope signal of timing and burst signal and eliminated phase ambiguity timing signal, will disappear
Except phase ambiguity timing signal is exported by output port 2 to the input port 11 of eight branch DAR demodulation modules (18)；LDPC is translated
Code module (20) makes to can be carried out decoding to the burst of piecemeal code stream, piecemeal clock and piecemeal, obtains tap clock, tap code stream and divides
It is enabled to connect burst, and will tap clock, tap code stream and tap burst is enabled passes through output port 4, output port 5 and defeated respectively
Exit port 6 corresponds output to input port 5, input port 6 and the input port 7 for assisting multiple/coupler (1).
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