CN107994922A - A kind of method and its system for improving spread spectrum system traffic rate - Google Patents
A kind of method and its system for improving spread spectrum system traffic rate Download PDFInfo
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- CN107994922A CN107994922A CN201711270608.6A CN201711270608A CN107994922A CN 107994922 A CN107994922 A CN 107994922A CN 201711270608 A CN201711270608 A CN 201711270608A CN 107994922 A CN107994922 A CN 107994922A
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0055—ZCZ [zero correlation zone]
- H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
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Abstract
The invention discloses a kind of method for improving spread spectrum system traffic rate and the system for improving spread spectrum system traffic rate is used for realization, step includes：Step 1, reception bit data are grouped combination, and bit data is converted into multi-system data；Step 2, by multi-system data obtain frequency expansion sequence by sequence and phase combining multi-system data mapping operations, then passes through cyclic shift and phase place Joint Mapping modulation operation forms modulated spread spectrum signal；Step 3, digital analog converter receive modulated spread spectrum signal and send it to analog-digital converter；Step 4, by modulated spread spectrum signal through the computing of cyclic shift coherently despreading, phase place demodulation computing and sequence and phase multi-system data demapping, obtain multi-system data, then switch back to bit data.The present invention improves traffic rate under same wired bandwidth, enhances the availability of frequency spectrum and efficiency of transmission；Under same bit rate, spreading ratio can be improved, enhances anti-multipath fading ability.
Description
Technical field
The invention belongs to wireless communication technology field, more particularly to a kind of method for improving spread spectrum system traffic rate and its
System.
Background technology
With the development of electronic technology, the electromagnetic environment of modern war is increasingly complicated, and intercepting and capturing means are also increasingly advanced, right
Communication system proposes the requirement of higher, and anti-interference, the ability of anti-interception of system are improved using technologies such as spread spectrum, frequency hopping, encryptions.
Direct sequence spread spectrum communication system is a kind of typical modern digital communication systems, it is in transmitting terminal spreading code by the frequency of signal
Channel is re-fed into after spectrum extension to be transmitted, and despreading is completed in the identical spreading code of receiving terminal.Since spread-spectrum signal is transmitting
Shi Suozhan bandwidth is considerably beyond the bandwidth sent needed for information, thus spread-spectrum signal can be hidden among noise, makes signal difficult
In detection, even but and if detect the spreading code that spread-spectrum signal does not know originating party, it is also difficult to original information is extensive
Appear again and.This communication system is obtained for more next in fields such as military communication, satellite communication, mobile communication, navigation and C4ISR
More it is widely applied.But with the diversity of military operational need, required communication rate is higher and higher, and bandwidth increasingly has
Limit, therefore, it is necessary under conditions of signal highly concealed type, low intercepting and capturing and low detection is ensured, want real in limited channel width
When transmission of large capacity information, so traditional directly-enlarging system is difficult to take into account anti-interference and high rate communication double requirements, because
This tamed spread spectrum comes into being.
Existing tamed spread spectrum is to be combined from direct sequence spread spectrum skill with coding techniques and develop the one kind come newly
The base-band spread-spectrum technology of type, it is mainly used in those frequency bands and is limited but in data transfer rate and more demanding communication system, such as
Burst communication, Computer Wireless Communication, wireless LAN communication etc..
It is therefore desirable to by using CAZAC (Constant Amplitude Zero Auto Correlation, Heng Bao
Network zero auto-correlation) sequence zero auto-correlation and nearly zero cross correlation, from different dimensions combined modulation improve spread spectrum system communication speed
The method of rate, by realizing that multidimensional multi-system is spread to cyclic shift modulation and phase-modulation dual modulation so that limited
Do not increase system complexity in bandwidth at the same time and the traffic rate of spread spectrum system is improved on the premise of sacrificing interference free performance.
The content of the invention
The object of the present invention is to provide a kind of method and its system for improving spread spectrum system traffic rate, the present invention is not increasing
Add existing bandwidth and hardware resource, under conditions of also not reducing system rejection to disturbance performance, by using with zero auto-correlation and closely
The CAZAC sequences of zero cross correlation are realized with 2k cyclic shifts as frequency expansion sequence and carry out multi-system to k bit information
Band spectrum modulation, then carries out phase-modulation to the CAZAC sequences after the cyclic shift, and phase-modulation is reflected using p bit information
Penetrate, by the various dimensions modulation system of this multi-system spread spectrum+phase-modulation, do not increasing signal bandwidth and computation complexity
In the case of, k+p times can be improved than traditional Resistant DS Spread Spectrum System speed, increase (k+p)/k times than common tamed spread spectrum system.
To reach above-mentioned purpose, a kind of method of raising spread spectrum system traffic rate of the invention, steps of the method are：
Step 1, reception bit data are grouped combination, then bit data are converted into multi-system number by serioparallel exchange
According to；
Step 2, by the multi-system data by sequence and phase combining multi-system data mapping operations obtain spread spectrum sequence
Row, then modulated frequency expansion sequence is obtained by cyclic shift and phase place Joint Mapping modulation operation, form band spectrum modulation
Signal；
Step 3, digital analog converter receive the modulated spread spectrum signal and send it to analog-digital converter；
Step 4, by modulated spread spectrum signal by the computing of cyclic shift coherently despreading, phase place demodulation computing and sequence and
Phase multi-system data demapping operation, obtains multi-system data, then through parallel serial conversion into bit data.
Preferably, the step 2 includes：Each group of k+p bit datas obtain one group of frequency expansion sequence by mapping, k
Bit data and p bit datas form the first decimal data K and the second decimal data P respectively；Wherein, the spread spectrum sequence
It is classified as time-domain signal.
Preferably, the step 2 also includes：The frequency expansion sequence is circulated according to the first decimal data K
Displacement, carries out phase place, by cyclic shift and phase place to the frequency expansion sequence after the cyclic shift with phase value
Then sequence afterwards carries out the band spectrum modulation data value filtering interpolation and insertion is synchronous successively as band spectrum modulation data value
Series processing, is finally sent to digital analog converter by the modulated spread spectrum signal after processing and exports to wireless channel.
Preferably, in the step 2, the corresponding N number of cyclic shift of frequency expansion sequence and P phase rotation after mapping
One group of k+p bit data of indexable number and transmitting terminal match；N number of phase loop, which is shifted through, is aided with P phase shape
Into N*P frequency expansion sequence, the frequency expansion sequence is：
In formula, N is the length of frequency expansion sequence, and M is relatively prime with N, and q is arbitrary integer.
Preferably, the cyclic shift and the phase place process are specially：
Data prediction first is carried out to the frequency expansion sequence after mapping, to produce K cyclic shift code of N former spreading codes,
Wherein K=2k≤N；
Set a N frequency expansion sequence { c0,c1,c2..., cN-3,cN-2,cN-1, and handle to obtain N by right cyclic shift
The sequence of the different position orderings of kind：
{c0,c1,c2..., cN-3,cN-2,cN-1}：Ring shift right represents data 00 time；
{cN-1,c0,c1,c2..., cN-3,cN-2}：Ring shift right represents data 11 time；
{cN-2,cN-1,c0,c1,c2..., cN-3}：Ring shift right represents data 22 times；
{c1,c2,…cN-3,cN-2,cN-1,c0}：Ring shift right represents data N-1 N-1 times；
Set a frequency expansion sequence { c after k cyclic shiftsN-k,cN-k+1,c0,c1,c2..., cN-k-1, and pass through phase
Position rotary coding handles to obtain the sequence of P kind outs of phase：
Phase place represents data 00 time；
Phase place represents data 11 time；
Phase place represents data 22 times；
Phase place represents data P-1 P-1 times.
Preferably, in the step 3, the analog-digital converter and the digital analog converter are connected with wireless channel, make mould
Number converter receives the modulated spread spectrum signal of digital analog converter output；The modulated spread spectrum signal of the analog-digital converter output passes through
Timing Synchronization and Frequency Synchronization, filtering extraction, the modulated spread spectrum signal after be eliminated timing error and frequency error.
Preferably, in the step 4, the step of cyclic shift coherently despreading fortune, includes：
The modulated spread spectrum signal received is subjected to multiple spot FFT computings, obtains the frequency of the modulated spread spectrum signal received
Domain signal；
Carry out multiple spot FFT transform and conjugation computing cross-correlation successively by local reference sequence；
The conjugation computing cross-correlation result carries out corresponding points with the frequency-region signal of the modulated spread spectrum signal number received and is multiplied
Computing obtains more point sequences, and carries out IFFT computings to more point sequences and obtain multiple spot sequence of complex numbers, then the multiple spot is answered
Number Sequence carries out modulo operation, obtains correlation；
According to the corresponding sequence by cyclic shift of the location determination in more point sequences of correlation maximum, demodulation
And demapping obtains corresponding k bit data；
The step of phase place demodulation computing, includes：
After cyclic shift coherently despreading computing, the data value of corresponding conjugation correlated series maximum to correlation carries out
Simultaneously demapping obtains corresponding p bit data for phase demodulating.
Present invention also offers a kind of expansion of the method for the raising spread spectrum system traffic rate being used for realization as described above
Display system,
The system includes：It is arranged at serioparallel exchange module, sequence and phase combining multi-system the data mapping of receiving terminal
Module, cyclic shift and phase place Joint Mapping modulation module and digital analog converter；Wherein, the serioparallel exchange module receives
Bit data is simultaneously converted into multi-system data by bit data, and the sequence and phase combining multi-system data mapping module will be more
Binary data be mapped to frequency expansion sequence, and cyclic shift and phase place the Joint Mapping modulation module is by the spread spectrum sequence
Row form modulated spread spectrum signal by cyclic shift and phase place；
The system also includes：Analog-digital converter, sequence and the phase combining multi-system data solution for being arranged at receiving terminal are reflected
Penetrate and reconcile module, cyclic shift and phase place joint demapping modulation module and parallel serial conversion module；Wherein, sequence and phase
Joint multi-system data De-mapping module and cyclic shift and phase place joint demapping modulation module are used for band spectrum modulation
Signal demodulates and is de-mapping to multi-system data, and the parallel serial conversion module is by multi-system data conversion into bit data.
Preferably, cyclic shift and phase place joint the demapping modulation module also includes FFT module and IFFT moulds
Block；The FFT module will be expanded modulated spread spectrum signal by time-domain signal formal argument to frequency-region signal form, the IFFT modules
Frequency modulation entire signal is by frequency-region signal formal argument to time domain signal form.
Preferably, the transmitting terminal is additionally provided with the cyclic shift and phase place Joint Mapping modulation module successively
Filtering interpolation module, insertion synchronizing sequence module and the digital analog converter of connection；
The receiving terminal is additionally provided with sequentially connected analog-digital converter, received band spectrum modulation is found for auto-correlation
The time synchronization module of the frame head of signal, the frequency departure for the related operation rotation searching sending and receiving end that is delayed carry out corresponding to compensation
Frequency synchronization module and filtering extraction module；
The digital analog converter is connected by wireless channel with the analog-digital converter.
Compared with prior art, beneficial effects of the present invention are：The present invention uses initial CAZAC sequence in spread spectrum system
As consensus sequence, multi-system is formed by consensus sequence cyclic shift and phase place and spreads map modulation, is adjusted as spread spectrum
Signal processed is transmitted, after receiving terminal to spread-spectrum signal by carrying out FFT transform, in frequency domain and local reference CAZAC sequences
Carry out related operation and phase demodulating computing, determine cyclically shifted sequences and phase rotation angle, joint demodulation recover it is more into
Data processed；Relative to conventional spread spectrum technology, traffic rate is improved under same wired bandwidth, enhances the availability of frequency spectrum and biography
Defeated efficiency；Under same bit rate, spreading ratio can be improved, enhances anti-multipath fading ability.
Brief description of the drawings
The schematic diagram of the method for the raising spread spectrum communication system transmission rate of Fig. 1 present invention；
CAZAC sequence cyclic shifts mapping principle figure in Fig. 2 present invention；
The example schematic of CAZAC sequence demappings in Fig. 3 a- Fig. 3 b present invention；
The example schematic of CAZAC sequence phase demappings in Fig. 4 a- Fig. 4 b present invention.
Embodiment
The present invention provides a kind of method and its system for improving spread spectrum system traffic rate, in order to make the present invention brighter
Aobvious understandable, below in conjunction with the drawings and specific embodiments, the present invention will be further described.
The method of the raising spread spectrum system traffic rate of the present invention is the raising spread spectrum system traffic rate based on the present invention
System on the basis of realize.The system includes：The serioparallel exchange module, sequence and phase combining for being arranged at transmitting terminal are more
Binary data mapping block, cyclic shift and phase place Joint Mapping modulation module, filtering interpolation module, insertion synchronizing sequence
Module and digital analog converter DAC.The system is also comprising analog-digital converter ADC, time synchronization module, the frequency for being arranged at receiving terminal
Rate synchronization module, filtering extraction module, sequence and phase combining multi-system data demapping reconcile module, cyclic shift and phase
Rotary joint demapping modulation module and parallel serial conversion module.
Serioparallel exchange module, it is used to high speed serialization bit stream be converted to multi-system data flow.Receiving terminal and go here and there change
Block is changed the mold, it is high speed serialization bit stream that it, which is used for multi-system data stream,.Wherein, it is respectively provided with base in transmitting terminal and receiving terminal
In the consensus sequence and reference phase of CAZAC sequences.
Sequence and phase combining multi-system data mapping module, it is used to data to be sent being grouped by k+p bit
After map frequency expansion sequence, then the circulation by the mapping frequency expansion sequence by cyclic shift and phase place Joint Mapping modulation module
Displacement and phase place form modulated spread spectrum signal.Wherein, cyclic shift and phase place Joint Mapping modulation module are to reflect
Frequency expansion sequence after penetrating carries out carrying out phase place modulating-coding on the basis of cyclic shift coding.
Digital analog converter DAC is connected by wireless channel with analog-digital converter ADC.Digital analog converter DAC is received and passed through successively
Cross the filtering interpolation of filtering interpolation module and by being inserted into synchronizing sequence of the addition of synchronizing sequence module after filtering interpolation
Framing operate the data frame of the modulated spread spectrum signal to be formed, and export to wireless channel, then analog-digital converter ADC is received and come from
The data frame of the modulated spread spectrum signal of wireless channel.
Time synchronization module is used for the spread-spectrum signal frame that the data frame of the modulated spread spectrum signal of reception is found by auto-correlation
Head.
Frequency synchronization module is used to find out the frequency departure of transmitting-receiving two-end by the related operation that is delayed and compensate.
Sequence and phase combining multi-system data De-mapping module and the joint demapping modulation of cyclic shift and phase place
Module is used to the demodulation of quadrature amplitude modulation signal, demapping returning bit (bit) sequence.Wherein, cyclic shift and phase place
Joint demapping modulation module also includes FFT module and IFFT modules, and FFT module is used for CAZAC frequency expansion sequence data by time domain
Transform to frequency domain.IFFT modules are used for CAZAC frequency expansion sequence signals from frequency-domain transform to time domain.
As shown in Figure 1, in transmitting terminal, data to be sent are gone here and there and become with k+p bit packets combinations respectively
Change, then carry out sequence and phase combining multi-system data mapping frequency expansion sequence.Wherein, each group of k+p bit data pass through mapping
One group of CAZAC frequency expansion sequence is obtained, which is time-domain signal.K form two decimal systems respectively with p bit data
Data K and P.
Cyclic shift is carried out to CAZAC frequency expansion sequences according to decimal value K, so as to obtain the CAZAC after cyclic shift
Frequency expansion sequence, then to the CAZAC frequency expansion sequences after the cyclic shift with phase value P*2 pi/2spPhase place is carried out, this is followed
Ring is shifted with the sequence after phase place as modulated spread spectrum signal data value, then carries out filtering interpolation, then add by inserting
Synchronizing sequence after value filtering completes framing work, and complete spread spectrum data frame is finally sent to digital analog converter DAC outputs
To wireless channel.
Wherein, the data to be sent of transmitting terminal by k+p bit information correspond to CAZAC frequency expansion sequences N number of cyclic shift and
P phase place digit, N number of phase loop displacement are aided with P phase and form N*P frequency expansion sequence again, and the length of sequence is also
N, corresponding frequency expansion sequence of these sequences as k+p bit.Illustratively, CAZAC frequency expansion sequences { cnBe defined as follows：
In formula, N is the length of frequency expansion sequence, and M is relatively prime with N, and q is arbitrary integer.
Wherein, CAZAC sequences are zero auto-correlation sequence (Constant Amplitude Zero Auto
Correlation).After any CAZAC sequence cyclic shifts n, when n is not the integral multiple in the cycle of CAZAC sequences, after displacement
Sequence it is uncorrelated to former sequence, its cross-correlation and partial correlation values are close to 0；CAZAC sequences pass through the positive inverse transformation of Fourier
(FFT, Fourier transformation；IFFT, Fourier inversion) after be still CAZAC sequences；And the letter being made of CAZAC sequences
Number, its peak value is very low with its average power.
In the circulation for CAZAC frequency expansion sequence cyclic shifts of cyclic shift and phase place Joint Mapping modulation module
Shift in coding module, data prediction first is carried out to N CAZAC frequency expansion sequences, to produce K circulation of N former spreading codes
Shift code (wherein K=2k≤N).
It is assumed that N CAZAC sequences { c0,c1,c2..., cN-3,cN-2,cN-1Handled and can obtained by right cyclic shift
The sequence of the N kind differences position ordering arrived is as follows：
{c0,c1,c2..., cN-3,cN-2,cN-1}：Ring shift right represents data 00 time；
{cN-1,c0,c1,c2..., cN-3,cN-2}：Ring shift right represents data 11 time；
{cN-2,cN-1,c0,c1,c2..., cN-3}：Ring shift right represents data 22 times；
……
{c1,c2,…cN-3,cN-2,cN-1,c0}：Ring shift right represents data N-1 N-1 times.
Wherein, cyclic shift and phase place Joint Mapping modulation module are to carry out cyclic shift coding in frequency expansion sequence
On the basis of carry out phase place modulating-coding.It is assumed that a frequency expansion sequence after k cyclic shifts is { cN-k,cN-k+1,c0,
c1,c2..., cN-k-1, the sequence by the available P kinds out of phase of phase place coded treatment is as follows：
Phase place represents data 00 time；
Phase place represents data 11 time；
Phase place represents data 22 times；
……
Phase place represents data P-1 P-1 times.
As shown in Figure 1, in receiving terminal, the spread spectrum data frame from wireless channel is received, and adopt by analog-digital converter ADC
After sample, Timing Synchronization and Frequency Synchronization computing are first passed through, filtering extraction is carried out, is eliminated after timing error and frequency error
Frequency expansion sequence signal data frame, carries out frequency expansion sequence signal data frame cyclic shift conjugation coherently despreading computing and phase place
Computing is demodulated, sequence and phase multi-system data demapping is carried out, k+p multi-system data is obtained, most afterwards through parallel serial conversion solution
Recall final bit data flow.
Wherein, it is that the function modules such as passage time synchronization module and frequency synchronization module find the expansion that receives in receiving terminal
The frame synchronization head of frequency signal, and frequency departure is eliminated, a series of spread spectrum time-domain signals are then determined according to frame head.
In addition, computing cross-correlation and phase demodulating, root are carried out by local CAZAC sequences and the sequence received in receiving terminal
The circulating shift data value of CAZAC sequences is determined according to maximum value position after relevant peaks modulus, demodulates corresponding k bit information；
Then determine its phase place data value further according to correlation peak, corresponding p bit information is demodulated, so as to finally combine
To k+p bit information.
As shown in Fig. 2, cyclic shift and phase place joint demapping demodulation calculating process include：The related fortune of cyclic shift
Calculate and phase place demodulates two steps of computing.
The step of cyclic shift related operation is specially：
Cyclic shift related operation is that the received frequency expansion sequence signal of docking (is the cyclically shifted sequences of CAZAC sequences
Data) N point FFT computings are carried out, obtain the frequency-region signal form of the frequency expansion sequence signal.By local reference CAZAC sequences according to
Secondary progress N point FFT transform and conjugation computing cross-correlation, the conjugation computing cross-correlation result and the CAZAC cyclic shifts received
The frequency-region signal sequence of sequence carries out corresponding points multiplication operation and obtains N point sequences { ck, and to the N point sequences { ckDo IFFT fortune
Calculation obtains N point sequence of complex numbers { cn, then to the N point sequence of complex numbers { cnCarry out modulo operation, obtain final correlation | cn|}
With the position of correlation maximum (i.e. relevant peaks).
Position V in the N point sequences according to where correlation maximump, determine the CAZAC sequences of corresponding cyclic shift,
Demodulation is mapped as k bit information, then carries out phase demodulating to the data value that correlated series is conjugated corresponding to relevant peaks, obtains
Simultaneously demapping goes out p bit information to rotatable phase.The digit K=V of the cyclic shift of CAZAC sequencesp- 1, the K are what is demodulated
Multi-system data.
It is as shown in Figure 3a and Figure 3b shows specific demodulation example, wherein, Fig. 3 a show Vp=16, demodulate multi-system data
For 15.Fig. 3 b show Vp=26, demodulation multi-system data are 25.Abscissa X-axis in Fig. 3 a and Fig. 3 b schematic diagrames represents Vp
Value, ordinate is correlation.
Phase place demodulation computing concretely comprises the following steps：
Phase place demodulates computing after cyclic shift decorrelation computing, its sequence data c corresponding to relevant peaksnAsk
Solve phase thetan, P then is demodulated according to phase place mapping relations, is as shown in figures 4 a and 4b demodulation example.In Fig. 4 a
Phase is pi/2, and demodulation multi-system data are 2；Phase in Fig. 4 b is π/4, and demodulation multi-system data are 1.
In conclusion expand by the present invention in that being used as by the use of the CAZAC sequences with zero auto-correlation and nearly zero cross correlation
Frequency sequence, is realized to k bit information progress multi-system band spectrum modulations with 2k cyclic shifts, then to the cyclic shift after
CAZAC sequences carry out phase-modulation, and phase-modulation uses p bit information MAPs, passes through this multi-system spread spectrum+phase-modulation
Various dimensions modulation system, can be than traditional Direct Sequence Spread Spectrum in the case where not increasing signal bandwidth and computation complexity
System velocity improves k+p times, increases (k+p)/k times than common tamed spread spectrum system.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
- A kind of 1. method for improving spread spectrum system traffic rate, it is characterised in that steps of the method are：Step 1, reception bit data are grouped combination, then bit data are converted into multi-system data by serioparallel exchange；Step 2, by the multi-system data obtain frequency expansion sequence by sequence and phase combining multi-system data mapping operations, then Modulated frequency expansion sequence is obtained by cyclic shift and phase place Joint Mapping modulation operation, forms modulated spread spectrum signal；Step 3, digital analog converter receive the modulated spread spectrum signal and send it to analog-digital converter；Modulated spread spectrum signal, is passed through the computing of cyclic shift coherently despreading, phase place demodulation computing and sequence and phase by step 4 Multi-system data demapping operation, obtains multi-system data, then through parallel serial conversion into bit data.
- 2. the method for spread spectrum system traffic rate is improved as claimed in claim 1, it is characterised in that the step 2 includes：Each group of k+p bit datas obtain one group of frequency expansion sequence, k bit datas and p bit data difference by mapping Form the first decimal data K and the second decimal data P；Wherein, the frequency expansion sequence is time-domain signal.
- 3. the method for spread spectrum system traffic rate is improved as claimed in claim 2, it is characterised in that the step 2 also includes：Cyclic shift is carried out to the frequency expansion sequence according to the first decimal data K, to after the cyclic shift Frequency expansion sequence carries out phase place with phase value, using the sequence after cyclic shift and phase place as band spectrum modulation data value, Then filtering interpolation and insertion synchronizing sequence processing are carried out successively to the band spectrum modulation data value, finally by the spread spectrum after processing Modulated signal is sent to digital analog converter and exports to wireless channel.
- 4. the method for spread spectrum system traffic rate is improved as claimed in claim 2 or claim 3, it is characterised in that in the step 2 In, one group k+p of the corresponding N number of cyclic shift of frequency expansion sequence and P phase place digit and transmitting terminal after mapping Bit data matches；N number of phase loop, which is shifted through, is aided with P phase N*P frequency expansion sequence of formation, the spread spectrum sequence It is classified as：In formula, N is the length of frequency expansion sequence, and M is relatively prime with N, and q is arbitrary integer.
- 5. the method for spread spectrum system traffic rate is improved as claimed in claim 4, it is characterised in that the cyclic shift and institute Stating phase place process is specially：Data prediction first is carried out to the frequency expansion sequence after mapping, to produce K cyclic shift code of N former spreading codes, wherein K =2k≤N；Set a N frequency expansion sequence { c0,c1,c2..., cN-3,cN-2,cN-1, and handle by right cyclic shift to obtain N kinds not With the sequence of position ordering：{c0,c1,c2..., cN-3,cN-2,cN-1}：Ring shift right represents data 00 time；{cN-1,c0,c1,c2..., cN-3,cN-2}：Ring shift right represents data 11 time；{cN-2,cN-1,c0,c1,c2..., cN-3}：Ring shift right represents data 22 times；{c1,c2,…cN-3,cN-2,cN-1,c0}：Ring shift right represents data N-1 N-1 times；Set a frequency expansion sequence { c after k cyclic shiftsN-k,cN-k+1,c0,c1,c2..., cN-k-1, and revolved by phase Turn coded treatment and obtain the sequence of P kind outs of phase：Phase place represents data 00 time；Phase place represents data 11 time；Phase place represents data 22 times；Phase place represents data P-1 P-1 times.
- 6. the method for spread spectrum system traffic rate is improved as claimed in claim 1, it is characterised in thatIn the step 3, the analog-digital converter and the digital analog converter are connected with wireless channel, receive analog-digital converter The modulated spread spectrum signal of digital analog converter output；The modulated spread spectrum signal of the analog-digital converter output passes through Timing Synchronization and Frequency Synchronization, filtering extraction, is eliminated Modulated spread spectrum signal after timing error and frequency error.
- 7. the method for spread spectrum system traffic rate is improved as claimed in claim 2 or claim 3, it is characterised in thatIn the step 4, the step of cyclic shift coherently despreading fortune, includes：The modulated spread spectrum signal received is subjected to multiple spot FFT computings, obtains the frequency domain letter of the modulated spread spectrum signal received Number；Carry out multiple spot FFT transform and conjugation computing cross-correlation successively by local reference sequence；The frequency-region signal of the conjugation computing cross-correlation result and the modulated spread spectrum signal number received carries out corresponding points multiplication operation More point sequences are obtained, and IFFT computings are carried out to more point sequences and obtain multiple spot sequence of complex numbers, then to the multiple spot plural number sequence Row carry out modulo operation, obtain correlation；According to the corresponding sequence by cyclic shift of the location determination in more point sequences of correlation maximum, demodulation and solution Mapping obtains corresponding k bit data；The step of phase place demodulation computing, includes：After cyclic shift coherently despreading computing, the data value of corresponding conjugation correlated series maximum to correlation carries out phase Demodulate and demapping obtains corresponding p bit data.
- A kind of 8. spread spectrum of the method for the raising spread spectrum system traffic rate being used for realization as described in claim 1-7 any one System, it is characterised in thatThe system also includes：It is arranged at serioparallel exchange module, sequence and phase combining multi-system data the mapping mould of receiving terminal Block, cyclic shift and phase place Joint Mapping modulation module and digital analog converter；Wherein, the serioparallel exchange module receives ratio Bit data is simultaneously converted into multi-system data by special data, the sequence and phase combining multi-system data mapping module will more into Data processed be mapped to frequency expansion sequence, and cyclic shift and phase place the Joint Mapping modulation module is by the frequency expansion sequence Modulated spread spectrum signal is formed by cyclic shift and phase place；The system also includes：It is arranged at analog-digital converter, sequence and the phase combining multi-system data demapping tune of receiving terminal Solve module, cyclic shift and phase place joint demapping modulation module and parallel serial conversion module；Wherein, sequence and phase combining Multi-system data De-mapping module and cyclic shift and phase place joint demapping modulation module are used for modulated spread spectrum signal Demodulate and be de-mapping to multi-system data, the parallel serial conversion module is by multi-system data conversion into bit data.
- A kind of 9. spread spectrum system as claimed in claim 8, it is characterised in thatCyclic shift and phase place joint the demapping modulation module also includes FFT module and IFFT modules；The FFT module will by time-domain signal formal argument to frequency-region signal form, the IFFT modules by modulated spread spectrum signal Spread spectrum adjustment signal is by frequency-region signal formal argument to time domain signal form.
- A kind of 10. spread spectrum system as claimed in claim 8, it is characterised in thatThe transmitting terminal is additionally provided with and the cyclic shift and the sequentially connected interpolation of phase place Joint Mapping modulation module Filter module, insertion synchronizing sequence module and digital analog converter；The receiving terminal is additionally provided with sequentially connected analog-digital converter, received modulated spread spectrum signal is found for auto-correlation The time synchronization module of frame head, the frequency departure of finding for the related operation rotation that is delayed sending and receiving end correspond to the frequency of compensation Synchronization module and filtering extraction module；The digital analog converter is connected by wireless channel with the analog-digital converter.
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