CN106357325B - High-order multidimensional spread spectrum modulator, high-order multidimensional despread-and-demodulation device and spread spectrum device - Google Patents
High-order multidimensional spread spectrum modulator, high-order multidimensional despread-and-demodulation device and spread spectrum device Download PDFInfo
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- CN106357325B CN106357325B CN201610962080.8A CN201610962080A CN106357325B CN 106357325 B CN106357325 B CN 106357325B CN 201610962080 A CN201610962080 A CN 201610962080A CN 106357325 B CN106357325 B CN 106357325B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/22—Scatter propagation systems, e.g. ionospheric, tropospheric or meteor scatter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
Device is spread the invention discloses a kind of high-order multidimensional spread spectrum modulator, a kind of high-order multidimensional despread-and-demodulation device and based on high-order multidimensional spread spectrum modulator and a kind of scatter communication high-order multidimensional of high-order multidimensional despread-and-demodulation device, it is related to, and transmission power in scatter communication field is limited, modulation-demodulation device of strong antijamming capability, extremely low detection threshold.Algorithm binding time diversity is spread using high-order multidimensional, the anti-interference ability of scatter communication system and anti-deviation capability are effectively improved under conditions of transmission power is limited, and it can be declined with smoothed channel, obtain diversity gain, high performance channel coding/decoding has been used in the present invention simultaneously, the error performance for improving system, the normalization frequency deviation especially suitable for the transmission loss when long distance scatter communicates and system is very big, and the transmitting of information is reached under conditions of detection threshold is extremely low.
Description
Technical field
Limited, strong antijamming capability, extremely low detection threshold modulation that the present invention relates to transmission powers in scatter communication field
Demodulating equipment.Normalization frequency deviation especially suitable for the transmission loss when long distance scatter communicates and system is very big, detection threshold
Reach the transmitting of information under conditions of extremely low.
Background technology
When scattering telecommunication, since transmission loss is very big, need to reduce communications rate.Problems faced be as
What improves transmission performance and reduces the influence of external interference under extremely low detection threshold.Due to clock source stability limitation and
The presence of Doppler frequency shift, receiver carrier wave will produce a frequency shift (FS).And for slow data transmission, it is meant that system is returned
One, which changes frequency deviation, increases, and phase of received signal changes with time quickly, this will bring very strong negative to the extraction of coherent carrier
It influences, traditional coherent demodulation detection mode is no longer valid.
Invention content
It is provided present invention aims at the shortcoming avoided in above-mentioned background technology a kind of using the despreading of high-order multidimensional
Noncoherent detection mode, performance improvement is exchanged for bandwidth, and binding time diversity and coding realize error performance improvement and
The raising of interference free performance.
The object of the present invention is achieved like this：
A kind of high-order multidimensional spread spectrum modulator, including encoder 14, serial-parallel converter 16, high-order space-filling curve device 17, letter
Number forming module 19 and Low Medium Frequency modulator 20；It is characterized in that, further including time diversity signal generator 15 and orthogonal spectrum expansion
Sequence generator 18；Encoder 14 receives the data after multiple connection and the clock after multiple connection and carries out Error Correction of Coding, after coding
Clock after data and coding is exported respectively to time diversity signal generator 15；After time diversity signal generator 15 will encode
Data and coding after clock be converted into time diversity signal and export to serial-parallel converter 16；Serial-parallel converter 16 is to the time point
Collect signal and carry out serial to parallel conversion, forms the roads m parallel signal and exported respectively to high-order space-filling curve device 17；Wherein, m is positive integer；
Orthogonal spreading sequence generator 18 generates 2mThe orthogonal compound frequency expansion sequence of item, by 2mFrequency expansion sequence is exported respectively to high-order multidimensional
Mapper 17；High-order space-filling curve device 17 searches corresponding with parallel signal frequency expansion sequence, by corresponding frequency expansion sequence export to
Signal forming module 19；Signal forming module 19 exports after corresponding frequency expansion sequence is carried out signal molding to Low Medium Frequency modulator
20, frequency spectrum is expanded the signal after forming spread spectrum after signal after molding progress Low Medium Frequency modulation by Low Medium Frequency modulator 20
Signal output after exhibition.
A kind of high-order multidimensional despread-and-demodulation device, including quadrature down converter 21, parallel noncoherent despreading device 22, timing extraction
Device 24 selects big decision device 25, parallel to serial converter 26 and decoder 28；It is characterized in that, further including that the first to the n-th time diversity is closed
And device 23-1 to 23-n and time diversity signal reconstruction device 27；Wherein, n=2m, m is positive integer；Quadrature down converter 21 receives
Digital signal forms I road signals and the roads Q signal after digital signal is carried out quadrature frequency conversion, by the roads I signal and the roads Q signal point
It does not export to parallel noncoherent despreading device 22；Parallel noncoherent despreading device 22 carries out relevant treatment to the roads I signal and the roads Q signal and obtains
To 2mRoad correlation peak signal, respectively by 2mRoad correlation peak signal corresponds output to the first to the n-th time diversity combiner 23-1
To 23-n；The first to the n-th time diversity combiner 23-1 to 23-n carries out the time point to the correlation peak signal respectively inputted respectively
The merging for collecting signal, is respectively sent to the time diversity signal after merging to select big decision device 25 and time extractor 24；Periodically
Extractor 24 extracts timing signal from the time diversity signal after merging and is exported respectively to selecting big decision device 25 and and go here and there change
Parallel operation 26；It selects big decision device 25 to extract the time diversity signal after merging under the action of timing signal, selects peak value
Maximum signal all the way exported respectively by binary form as maximum decision value, by maximum decision value each digit to and go here and there change
Parallel operation 26；Parallel to serial converter 26 carries out parallel serial conversion to maximum decision value under the action of timing signal and obtains serial binary system
Data code flow exports binary data code stream and timing signal respectively to time diversity signal reconstruction device 27；Time diversity is believed
Number reconstructor 27 reconstructs code word clock under the action of timing signal, will be in binary data code stream under the action of code word clock
Effective time diversity signal extraction comes out, and effective time diversity signal and code word clock are exported respectively to decoder
28；Decoder 28 completes error correction decoding to time diversity signal and code word clock and obtains demodulation code and demodulation clock, and by demodulation code
It is exported respectively with demodulation clock.
A kind of scatter communication high-order multidimensional spreads device, including auxiliary it is multiple/coupler 1, D/A converters 3, frequency mixer 4, this
Shake 5, bandpass filter 6, amplifier 7, intermediate frequency amplifier 8, A/D converters 9, phaselocked loop 11 and power supply 12, further includes that high-order is more
Dimensional expansion converting modulator and high-order multidimensional despread-and-demodulation device；The biography of the data for assisting multiple/coupler 1 to input external interface
Defeated rate and the transmission rate of clock are converted to channel transmission rate respectively, and auxiliary expense is added and carries out multiple connection, after multiple connection
Data and multiple connection after clock exported respectively to high-order multidimensional spread spectrum modulator 2；High-order multidimensional spread spectrum modulator 2 is after multiple connection
Clock under the action of by after multiple connection data carry out time diversity and by symbol carry out high-order multidimensional spread spectrum after output spectrum expand
For signal after exhibition to D/A converters 3, the signal after spread spectrum is converted into analog signal output to frequency mixer by D/A converters 3
4；Local oscillator 5 generates local carrier and exports to frequency mixer 4；Analog signal and local carrier be mixed by frequency mixer 4
It is exported to bandpass filter 6 after signal；Mixed frequency signal is filtered output after obtaining intermediate-freuqncy signal and extremely amplified by bandpass filter 6
Device 7；Amplifier 7 obtains Low Medium Frequency modulation output signal and exports to upconverter after being amplified intermediate-freuqncy signal；Intermediate frequency amplifies
Device 8 carries out automatic growth control to the Low Medium Frequency input signal of reception, and obtained amplified signal is exported to A/D converters
9；Amplified signal is converted to digital signal by A/D converters 9, and digital signal is exported to high-order multidimensional despread-and-demodulation device
10；High-order multidimensional despread-and-demodulation device 10 obtains demodulation clock and demodulation code after carrying out despreading demodulation processing to digital signal, will demodulate
Clock and demodulation code, which are sent into, assists multiple/coupler 1；Auxiliary is multiple/and coupler 1 will demodulate clock and demodulation code carries out tap processing respectively,
By after tap code and tap after clock export to outside；Phaselocked loop 11 is by externally input stable rubidium clock into after horizontal lock, frequency multiplication
Reference clock is exported to high-order multidimensional spread spectrum modulator 2 and high-order multidimensional despread-and-demodulation device 10.
The present invention has the following advantages over the background art：
1. present invention employs high-order multidimensional spread spectrum modulators 2 and high-order multidimensional despread-and-demodulation device 10, using high-order multidimensional
Spread spectrum has exchanged performance improvement for bandwidth and has had stronger anti-interference ability, while using time diversity and coding skill
Art obtains diversity gain and coding gain in the case where not increasing other hardware spendings of system, improves scatter communication system
Reliability of the system under extremely low detection threshold.
2. present invention employs high-order multidimensional despread-and-demodulation device 10, the noncoherent detection mode spread using high-order multidimensional,
Compared with traditional relevant detection mode, the anti-interference ability of scatter communication system and anti-deviation capability are effectively increased.
3. the circuit block of the present 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, and the structure of equipment is made to greatly simplify, and cost significantly reduces.
Description of the drawings
Fig. 1 is scatter communication high-order multidimensional spread spectrum device electrical schematic block diagram of the present invention.
Fig. 2 is the electrical schematic diagram of the high-order multidimensional spread spectrum modulator embodiment of the present invention.
Fig. 3 is the electrical schematic diagram of high-order multidimensional despread-and-demodulation device embodiment of the present invention.
Specific implementation mode
Referring to figs. 1 to Fig. 3, the invention will be further described.
A kind of high-order multidimensional spread spectrum modulator, including encoder 14, time diversity signal generator 15, serial-parallel converter
16, high-order space-filling curve device 17, orthogonal spreading sequence generator 18, signal forming module 19 and Low Medium Frequency modulator 20, Fig. 2 are
The electrical schematic block diagram of the present invention, embodiment press Fig. 2 connection lines.Encoder 14 receive multiple connection after data and multiple connection after when
Clock simultaneously carries out Error Correction of Coding, and the data after coding and the clock after coding are exported respectively to time diversity signal generator 15；
Data after coding and the clock after coding are converted into time diversity signal and exported to string simultaneously by time diversity signal generator 15
Converter 16；Serial-parallel converter 16 carries out serial to parallel conversion to time diversity signal, forms the roads m parallel signal and is exported respectively to high-order
Space-filling curve device 17；Wherein, m is positive integer；Orthogonal spreading sequence generator 18 generates 2mThe orthogonal compound frequency expansion sequence of item, by 2m
Frequency expansion sequence is exported respectively to high-order space-filling curve device 17；High-order space-filling curve device 17 searches spread spectrum corresponding with parallel signal
Sequence exports corresponding frequency expansion sequence to signal forming module 19；Signal forming module 19 carries out corresponding frequency expansion sequence
Output is to Low Medium Frequency modulator 20 after signal molding, and Low Medium Frequency modulator 20 is to shape after signal after molding progress Low Medium Frequency modulation
At the signal after spread spectrum, the signal after spread spectrum is exported.Embodiment encoder 14, time diversity signal generator
15, serial-parallel converter 16, high-order space-filling curve device 17, orthogonal spreading sequence generator 18, signal forming module 19, Low Medium Frequency tune
Device 20 processed is all made of altera corp of U.S. production Stratix Series FPGA chip manufacturings.
A kind of high-order multidimensional despread-and-demodulation device, including quadrature down converter 21, parallel noncoherent despreading device 22, first are to
N time diversity combiner 23-1 to 23-n, time extractor 24, select big decision device 25, parallel to serial converter 26, decoder 28 and when
Between diversity signal reconstructor 27, wherein n=2m, Fig. 3 is the scatter communication high-order multidimensional spread spectrum device electricity principle box of the present invention
Figure, embodiment press Fig. 3 connection lines.Quadrature down converter 21 receives digital signal, after digital signal is carried out quadrature frequency conversion
I road signals and the roads Q signal are formed, the roads I signal and the roads Q signal are exported respectively to parallel noncoherent despreading device 22；Parallel non-phase
Dry despreader 22 carries out relevant treatment to the roads I signal and the roads Q signal and obtains 2mRoad correlation peak signal, respectively by 2mRoad relevant peaks letter
Number output is corresponded to the first to the n-th time diversity combiner 23-1 to 23-n；The first to the n-th time diversity combiner 23-1
The merging for carrying out time diversity signal to the correlation peak signal respectively inputted respectively to 23-n, by the time diversity signal after merging
It is respectively sent to select big decision device 25 and time extractor 24；Time extractor 24 is extracted from the time diversity signal after merging
Go out timing signal to be exported respectively to selecting big decision device 25 and parallel to serial converter 26；Big decision device 25 is selected under the action of timing signal
Time diversity signal after merging is extracted, selects the maximum signal all the way of peak value as maximum decision value, maximum is sentenced
Certainly it is worth and exports each digit respectively by binary form to parallel to serial converter 26；Parallel to serial converter 26 is under the action of timing signal
Parallel serial conversion is carried out to maximum decision value and obtains serial binary data code stream, by binary data code stream and timing signal point
It does not export to time diversity signal reconstruction device 27；When time diversity signal reconstruction device 27 reconstructs code word under the action of timing signal
Clock comes out effective time diversity signal extraction in binary data code stream under the action of code word clock, and will be effective
Time diversity signal and code word clock are exported respectively to decoder 28；Decoder 28 completes time diversity signal and code word clock
Error correction decoding obtains demodulation code and demodulation clock, and demodulation code and demodulation clock are exported respectively.Embodiment quadrature down converter 21, simultaneously
Row noncoherent despreading device 22, time extractor 24, selects big decision device 25, parallel serial conversion at time diversity combiner 23-1 to 23-n
Device 26, time diversity signal reconstruction device 27, decoder 28 are all made of altera corp of U.S. production Stratix Series FPGA chips
It makes.
A kind of scatter communication high-order multidimensional spreads device, including auxiliary it is multiple/coupler 1, high-order multidimensional spread spectrum modulator 2,
D/A converters 3, frequency mixer 4, local oscillator 5, bandpass filter 6, amplifier 7, intermediate frequency amplifier 8, A/D converters 9, high-order multidimensional
Despread-and-demodulation device 10, phaselocked loop 11 and power supply 12, Fig. 1 are the scatter communication high-order multidimensional spread spectrum device electricity principle boxes of the present invention
Figure, embodiment press Fig. 1 connection lines.The described auxiliary is multiple/transmission rate of data that inputs external interface of coupler 1 and when
The transmission rate of clock is converted to channel transmission rate respectively, and auxiliary expense is added and carries out multiple connection, by data after multiple connection and multiple
Clock after connecing is exported respectively to high-order multidimensional spread spectrum modulator 2；The work of clock of the high-order multidimensional spread spectrum modulator 2 after multiple connection
Time diversity is carried out with the lower data by after multiple connection and by the signal after output spectrum extension after symbol progress high-order multidimensional spread spectrum
To D/A converters 3, the signal after spread spectrum is converted into analog signal output to frequency mixer 4 by D/A converters 3；Local oscillator 5 is produced
Raw local carrier is exported to frequency mixer 4；Analog signal and local carrier export after mixing obtains mixed frequency signal by frequency mixer 4
To bandpass filter 6；Mixed frequency signal is filtered to export to amplifier 7 after obtaining intermediate-freuqncy signal by bandpass filter 6；Amplifier
7 intermediate-freuqncy signal is amplified after obtain Low Medium Frequency modulation output signal and export to upconverter；Intermediate frequency amplifier 8 is to reception
Low Medium Frequency input signal carries out automatic growth control, and obtained amplified signal is exported to A/D converters 9；A/D converters
Amplified signal is converted to digital signal by 9, and digital signal is exported to high-order multidimensional despread-and-demodulation device 10；High-order multidimensional
Despread-and-demodulation device 10 obtains demodulation clock and demodulation code after carrying out despreading demodulation processing to digital signal, and demodulation clock and demodulation code are sent
Enter to assist multiple/coupler 1；Auxiliary is multiple/and coupler 1 will demodulate clock and demodulation code carries out tap processing respectively, by the code after tap
It is exported to outside with clock after tap；Phaselocked loop 11 is by externally input stable rubidium clock into exporting reference clock after horizontal lock, frequency multiplication
To high-order multidimensional spread spectrum modulator 2 and high-order multidimensional despread-and-demodulation device 10.Embodiment assists multiple/coupler 1, high-order multidimensional spread spectrum
Modulator 2, high-order multidimensional despread-and-demodulation device 10, phaselocked loop 11 are all made of altera corp of U.S. production Stratix Series FPGAs
Chip manufacturing, D/A converters 3 are using the AD9763 chip manufacturings of AD companies of the U.S., and frequency mixer 4 is using the production of Chengdu Asia Optical
HSB-3 make, local oscillator 5 using Silicon-Lab companies of the U.S. production SI4133-BT make, bandpass filter 6 using at
The SBPS-70 of Microwave Corporation's production in day makes, and amplifier 7 is made of the ERA-5SM of MINI companies of the U.S., intermediate frequency amplification
Device 8 is made of commercially available XN402 amplifiers, and A/D converters 9 use the AD9432 chip manufacturings of AD companies of the U.S..
Power supply 12 of the present invention provides the direct-current working volts of entire modulation-demodulation device, and embodiment is using commercially available general integrated
Constant voltage dc source module making, output+V voltages are+3.3V, supply current 1A.
The scatter communication high-order multidimensional spread spectrum brief operation principle of device of the present invention is as follows：
In the case where sending working method, assist multiple/coupler 1 is added auxiliary by the data of external interface A, B input, clock
Transmission rate is converted the number that multiple/coupler 1 will be assisted to generate to channel transmission rate, high-order multidimensional spread spectrum modulator 2 by expense
Word signal carries out time diversity and by the signal after output spectrum extension after symbol progress high-order multidimensional spread spectrum, this signal passes through D/
Become analog signal after A converters 3, the local carrier generated with local oscillator module 5 obtains mixed frequency signal by frequency mixer 4, so
Intermediate-freuqncy signal is obtained by bandpass filter 6 afterwards, Low Medium Frequency modulation output signal is obtained after the amplification of amplifier 7, using end
Mouth C is sent to upconverter；
In the case where receiving working method, the IF input signals to reception of intermediate frequency amplifier 8 carry out automatic growth control, A/
Analog signal dress is changed to digital signal by D converters 9, and this signal is sent into high-order multidimensional despread-and-demodulation device 10, despreading
Demodulator 10 will demodulate clock after carrying out despreading demodulation processing to signal and code is sent into and multiple/coupler 1 is assisted to carry out tap processing, point
Code clock after connecing is connect with port E, F.
Scatter communication high-order multidimensional spread spectrum device mounting structure of the present invention is as follows：
Mounting structure of the present invention is as follows：All circuit devcies in Fig. 1, Fig. 2, Fig. 3 be mounted on 3 block size sizes length × it is wide
For in the printed board of 280 × 140mm, it is 290 × 150 × 30mm that 3 pieces of printed boards, which are then separately mounted to 3 length × width × heights,
Shielding box plug-in unit in, shielding box plug-in unit be mounted on modem cabinet in, shielding box plug-in unit front panel install the network port
A, B, E, F quad socket and transmitting signal exit port C, two cable sockets for receiving signal inbound port D are pacified on rear panel
Dress external clock enters to hold G and power supply to enter to hold socket, assembly cost invention.
Claims (3)
1. a kind of high-order multidimensional spread spectrum modulator, including encoder (14), serial-parallel converter (16), high-order space-filling curve device
(17), signal forming module (19) and Low Medium Frequency modulator (20)；It is characterized in that, further including time diversity signal generator
(15) and orthogonal spreading sequence generator (18)；The data and the clock after multiple connection that encoder (14) docking is recovered after connecing are entangled
Miscoding exports the data after coding and the clock after coding respectively to time diversity signal generator (15)；Time diversity
Data after coding and the clock after coding are converted into time diversity signal and exported to serial-parallel converter by signal generator (15)
(16)；Serial-parallel converter (16) carries out serial to parallel conversion to time diversity signal, and the roads formation m parallel signal exports more to high-order respectively
Tie up mapper (17)；Wherein, m is positive integer；Orthogonal spreading sequence generator (18) generates 2mThe orthogonal compound frequency expansion sequence of item, will
2mFrequency expansion sequence is exported respectively to high-order space-filling curve device (17)；High-order space-filling curve device (17) is searched corresponding with parallel signal
Frequency expansion sequence, corresponding frequency expansion sequence is exported to signal forming module (19)；Signal forming module (19) is by corresponding expansion
Output to Low Medium Frequency modulator (20), Low Medium Frequency modulator (20) carry out signal after molding after frequency sequence carries out signal molding
The signal after spread spectrum is formed after Low Medium Frequency modulation, and the signal after spread spectrum is exported.
2. a kind of high-order multidimensional despread-and-demodulation device, including quadrature down converter (21), parallel noncoherent despreading device (22), periodically carry
It takes device (24), select big decision device (25), parallel to serial converter (26) and decoder (28)；It is characterized in that, further including the first to the n-th
Time diversity combiner (23-1) to (23-n) and time diversity signal reconstruction device (27)；Wherein, n=2m, m is positive integer；Just
It hands over low-converter (21) to receive digital signal, I road signals and the roads Q signal is formed after digital signal is carried out quadrature frequency conversion, by I
Road signal and the roads Q signal are exported respectively to parallel noncoherent despreading device (22)；Parallel noncoherent despreading device (22) to the roads I signal and
The roads Q signal carries out relevant treatment and obtains 2mRoad correlation peak signal, respectively by 2mRoad correlation peak signal correspond output to first to
N-th time diversity combiner (23-1) to (23-n)；The first to the n-th time diversity combiner (23-1) to (23-n) is respectively to each
Time diversity signal after merging is respectively sent to select big by the merging that time diversity signal is carried out from the correlation peak signal of input
Decision device (25) and time extractor (24)；Time extractor (24) extracts timing from the time diversity signal after merging to be believed
It number exports respectively to selecting big decision device (25) and parallel to serial converter (26)；It is right under the action of timing signal to select big decision device (25)
Time diversity signal after merging is extracted, and selects the maximum signal all the way of peak value as maximum decision value, maximum is adjudicated
Value is exported each digit by binary form to parallel to serial converter (26) respectively；Effect of the parallel to serial converter (26) in timing signal
Under to maximum decision value carry out parallel serial conversion obtain serial binary data code stream, by binary data code stream and timing signal
It is exported respectively to time diversity signal reconstruction device (27)；Time diversity signal reconstruction device (27) reconstructs under the action of timing signal
Code word clock comes out effective time diversity signal extraction in binary data code stream under the action of code word clock, and will
Effective time diversity signal and code word clock are exported respectively to decoder (28)；Decoder (28) is to time diversity signal and code
Word clock completes error correction decoding and obtains demodulation code and demodulation clock, and demodulation code and demodulation clock are exported respectively.
3. a kind of scatter communication high-order multidimensional spreads device, including assists multiple/coupler (1), D/A converters (3), frequency mixer
(4), local oscillator (5), bandpass filter (6), amplifier (7), intermediate frequency amplifier (8), A/D converters (9), phaselocked loop (11) and electricity
Source (12), which is characterized in that further include the height described in high-order multidimensional spread spectrum modulator and claim 2 described in claim 1
Rank multidimensional despread-and-demodulation device；The auxiliary is multiple/coupler (1) transmission rate of data that inputs external interface and clock
Transmission rate is converted to channel transmission rate respectively, and be added auxiliary expense carry out multiple connection, by after multiple connection data and multiple connection after
Clock exported respectively to high-order multidimensional spread spectrum modulator (2)；The work of clock of the high-order multidimensional spread spectrum modulator (2) after multiple connection
Time diversity is carried out with the lower data by after multiple connection and by the signal after output spectrum extension after symbol progress high-order multidimensional spread spectrum
To D/A converters (3), the signal after spread spectrum is converted into analog signal output to frequency mixer (4) by D/A converters (3)；This
(5) generation local carrier that shakes is exported to frequency mixer (4)；Analog signal and local carrier mixed by frequency mixer (4)
It is exported to bandpass filter (6) after frequency signal；Mixed frequency signal is filtered to export after obtaining intermediate-freuqncy signal by bandpass filter (6)
To amplifier (7)；Amplifier (7) obtains Low Medium Frequency modulation output signal after being amplified intermediate-freuqncy signal and exports to up-conversion
Device；Intermediate frequency amplifier (8) carries out automatic growth control to the Low Medium Frequency input signal of reception, and obtained amplified signal is defeated
Go out to A/D converters (9)；Amplified signal is converted to digital signal by A/D converters (9), and by digital signal export to
High-order multidimensional despread-and-demodulation device (10)；High-order multidimensional despread-and-demodulation device (10) obtains after carrying out despreading demodulation processing to digital signal
Clock and demodulation code are demodulated, demodulation clock and demodulation code are sent into and assist multiple/coupler (1)；Assist multiple/coupler (1) that clock will be demodulated
Carry out tap processing respectively with demodulation code, by after tap code and tap after clock export to outside；Phaselocked loop (11) will be external defeated
The stabilization rubidium clock entered is de-spread into output reference clock after horizontal lock, frequency multiplication to high-order multidimensional spread spectrum modulator (2) and high-order multidimensional
Demodulator (10).
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| CN107359900B (en) * | 2017-07-28 | 2019-11-05 | 中国电子科技集团公司第五十四研究所 | A kind of modem suitable for overlength distance scattering link |
| CN108123788B (en) * | 2017-12-18 | 2020-11-06 | 中国电子科技集团公司第五十四研究所 | Fast synchronization device based on blind separation iterative reconstruction and suitable for scattering communication |
| CN110572182B (en) * | 2019-10-12 | 2020-09-08 | 北京智芯微电子科技有限公司 | Power line channel transmission characteristic measuring method and system based on orthogonal spread spectrum sequence |
| CN111130961B (en) * | 2019-12-30 | 2021-08-31 | 中国电子科技集团公司第五十四研究所 | High-efficiency gigabit Ethernet access device in scattering communication |
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