CN106685474B - A kind of cycle spread spectrum modulation technique based on ZC sequences - Google Patents
A kind of cycle spread spectrum modulation technique based on ZC sequences Download PDFInfo
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- CN106685474B CN106685474B CN201610544353.7A CN201610544353A CN106685474B CN 106685474 B CN106685474 B CN 106685474B CN 201610544353 A CN201610544353 A CN 201610544353A CN 106685474 B CN106685474 B CN 106685474B
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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
Abstract
The invention belongs to Radar Technology fields, are related to a kind of cycle spread spectrum modulation technique based on ZC sequences.The present invention is that a kind of time domain CCSK modulation schemes based on the permanent envelope that Zadoff Chu sequences are basic function are proposed in traditional CCSK modulation schemes, the Zadoff Chu sequences of same length are generated in transmitting terminal and receiving terminal, as basic function, binary system bit streams are first mapped as value of symbol, then each value of symbol is once regarded as to the cyclic shift to basic function, value of symbol is mapped as to the ZC arrangement sets of cyclic shift, this is transmitting signal.Due to known to basic function, for Zadoff Chu sequences, so utilizing its good autocorrelation and cross correlation, in receiving terminal, by the signal received after balanced, make convolution with the ZC sequences of generation, obtained peak position is the value of symbol received, switched to binary system to flow to get to reception bit.
Description
Technical field
The invention belongs to Radar Technology fields, are related to a kind of cycle band spectrum modulation being based on ZC (Zadoff-Chu) sequence
(Cyclic Code Shift Keying, CCSK) method.
Background technology
With the development of electronic technology, the electromagnetic environment of modern city is increasingly complicated, and intercepting and capturing means are also increasingly advanced, right
More stringent requirements are proposed for communication system：It needs system using pure hair pulse transmission technique, so that signal pulse is shortened, signal is hidden
Property enhancing；Anti-interference, the ability of anti-interception of system are improved using technologies such as spread spectrum, frequency hopping, encryptions.Meanwhile ensureing that signal is high
Under conditions of concealment, LPI-LPD, the information of real-time Transmission large capacity is wanted in limited channel width, becomes modern secrecy
The target completed is badly in need of in communication, and CCSK coding spread spectrum technologies are to select well.And traditional use binary sequence as base
For the CCSK modulating systems of function while having low detection property with higher speed communication data rate, there are also problems, mainly in fact
Signal PAPR problems are now sent, and cause receiving terminal processing excessively complicated using frequency domain CCSK modulation, and to being capable of conduct
The sequence requirements of the basic function of CCSK modulation are very high.
Cycle band spectrum modulation based on Zadoff-Chu sequence is primarily due to the permanent envelope of ZC sequences itself, ensure that
The permanent envelope for sending signal, solves the papr (Peak to Average Power Ratio, PAPR) of signal
Problem makes system not influenced by the non-linear distortion of power amplifier；On the other hand, since CCSK modulation only changes ZC sequences
The phase characteristic of each element in row, therefore modulated data still have flat power spectrum characteristic, have low capture general
Rate and low probability of detection.
Invention content
It is to be solved by this invention, aiming at the above problem, propose a kind of cycle band spectrum modulation side based on ZC sequences
Method.Cycle band spectrum modulation based on Zadoff-Chu sequence is primarily due to the permanent envelope of ZC sequences itself, ensure that transmission letter
Number permanent envelope, solve papr (Peak to Average Power Ratio, PAPR) problem of signal,
System is set not influenced by the non-linear distortion of power amplifier；On the other hand, since CCSK modulation only changes in ZC sequences
The phase characteristic of each element, therefore modulated data still have flat power spectrum characteristic, have low acquisition probability with
Low probability of detection.
The technical scheme is that：A kind of cycle spread spectrum modulation technique based on ZC sequences, including：
Transmitting terminal：
A. binary system bit data flows are set as Bn=(bk-1,n,bk-2,n,...,b1,n,b0,n), wherein bm,n=0,1, m=0,1 ...,
M-1, n=1,2,3,4 ..., by bit data flows { BnValue of symbol be expressed as { Dn, wherein
B. it is M=2 to generate length by stationary phase mapperkZadoff-Chu sequence, be set as
The corresponding cyclically shifted sequences that move to left are
The ZC sequence basic function collections are { P0,P1,...,PM-1}；
C. since CCSK operations are actually the cyclic shift to time-domain signal, by value of symbol { DnBe mapped as to basic function
ZC sequences P0Cyclic shift number, obtain sequence sets { Pn', it is equivalent to the following mapping of realization in time domain：
D. by above-mentioned signal sn=Pn', n=1,2 ... pass through digital analog converter, transmitting signal is obtained after power amplifier；
Receiving terminal：
E. it after receiving signal by reception antenna, by it by analog-digital converter, receives signal and is represented by：
rn=sn+Nch, n=1,2 ...
Wherein NchFor the influence of multidiameter fading channel；
F. the docking collection of letters number carries out channel equalization, so that signal removal multidiameter fading channel is influenced, obtains sequence sets { Pn″},n
=1,2,；
G. due to eliminating the influence of multipath channel, ZC sequences P is receivedn" it can be considered the ZC sequences P of transmissionn', by { Pn″}
It inputs correlator and carries out CCSK demodulation；Due to the good autocorrelation performance of ZC sequences and good cross correlation, i.e., for arbitrary
The sequence of gained is orthogonal after Zadoff-Chu original series and its loopy moving n, and autocorrelation peak is sharp, and cross-correlation
With partial correlation values close to zero, thus reception sequence is related to original ZC sequences work, i.e.,
ri,n=Pn″*Pn', i=1,2 ..., 2M-1, n=1,2 ...
Then n is fixed, r is found outi,nIn maximum value, peak value position is data symbol value Dn′；
H. by data symbol value { Dn', n=1 2 ..., is converted into binary system bit stream by the decimal system, obtains and receives number
According to.
Beneficial effects of the present invention are that the present invention is to propose that one kind being based on Zadoff- in traditional CCSK modulation schemes
Chu sequences are the time domain CCSK modulation schemes of the permanent envelope of basic function.The program is being sent out on the basis of traditional CCSK is modulated
Sending end and receiving terminal generate the Zadoff-Chu sequence of same length, as basic function, binary system bit streams are first mapped as according with
Number value, then once regard each value of symbol as cyclic shift to basic function, value of symbol be mapped as to the ZC of cyclic shift
Arrangement set, this is transmitting signal.Due to basic function it is known that being Zadoff-Chu sequence, so utilize its good auto-correlation
Property and cross correlation by the signal received after balanced, make convolution with the ZC sequences of generation, obtain in receiving terminal
Peak position is the value of symbol received, is switched to binary system and is flowed to get to reception bit.CCSK modulation based on ZC sequences
Coding spread spectrum system, compared with multiband wavelet transform signal, not only have spectrum efficiency it is high and low intercepting and capturing with low detection characteristic and
Excellent bit error rate performance solves the problems, such as that the PAPR of signal, i.e. this system be not non-thread by no power amplifier more by its permanent envelope trait
Property distortion influence.
Description of the drawings
Fig. 1 is tradition CCSK modulation scheme sending end structure figures.
Fig. 2 is tradition CCSK modulation scheme receiving terminal structure charts.
Fig. 3 is the CCSK system schema sending end structure figures based on ZC sequences of the present invention.
Fig. 4 is the CCSK system schema receiving terminal structure charts based on ZC sequences of the present invention.
Specific implementation mode
Below in conjunction with the accompanying drawings, detailed description of the present invention technical solution：
Traditional CCSK coding spread spectrums are to be used as base letter by the function f (t) for selecting a cycle autocorrelation performance excellent
Number S0, S is used in combination0And its cyclically shifted sequences S1,S2,...,SM-2,SM-1It indicates data information, that is, completes data information to cycle
Shift function collection maps, and obtained from being modulated to carrier wave.
In most cases, basic function is a binary sequence, S0=(b0,b1,b2,...,bM-2,bM-1), bm=± 1
(0≤m≤M-1), M basic function length, the corresponding cyclically shifted sequences that move to left are S1=(b1,b2,...,bM-2,bM-1,b0), S2=
(b2,b3,...,bM-2,bM-1,b0,b1) ..., the collection of functions { S0,S1,...,SM-1In M element can at most indicate kbit data
Information：2k=M, mapping mode mostly concentrate the shift value to obtain shift sequence with kbit value of symbol respective functions.If data symbol is D
=(dk-1,dk-2,...,d1,d0), value of symbol VDFor
The mathematical description of Zadoff-Chu sequence is as follows：
Wherein N indicates the sequence length, and q is arbitrary integer, and u is the positive integer relatively prime with N, while it also illustrates that original sequence
The group number of row.Generally, u=1, q=0 can be enabled.
The characteristic of Zadoff-Chu sequence is as follows：
(1) good autocorrelation (cyclic shift characteristic).Arbitrary Zadoff-Chu original series are recycled with it
The sequence of gained is orthogonal after n mobile, and autocorrelation peak is sharp；
(2) good cross correlation, i.e. cross-correlation and partial correlation values are close to zero, convenient for receiving terminal accurately required
Signal detection comes out, and reduces detection mistake；
(3) banner characteristic, i.e., the constant amplitude of arbitrary Zadoff-Chu sequence, this characteristic can ensure in respective bandwidth
Each frequency point undergo identical excitation, the unbiased esti-mator being easy to implement in relevant detection；
(4) low peak average ratio characteristic, i.e., the ratio of the peak value and its mean value of the time-domain signal of arbitrary Zadoff-Chu sequence composition
Be worth it is relatively low, consequently facilitating the realization of power amplifier；
(5) arbitrary Zadoff-Chu sequence after Fourier transform and inverse Fourier transform by remaining as Zadoff-
Chu sequences, all properties with Zadoff-Chu sequence.
As shown in Figure 3 and Figure 4, modulator approach of the invention is mainly：
In transmitting terminal, generation length is M=2kZadoff-Chu sequence, as basic function, first by binary system bit
Flow point is that every kbit is a frame, then each frame is mapped as a decimal symbol value, then once sees each value of symbol
Make, to the cyclic shift of basic function, value of symbol to be mapped as to the ZC arrangement sets of cyclic shift, this is transmitting signal.Finally by
After digital analog converter and power amplifier, launched with transmission antenna.
In receiving terminal, it is M=2 to similarly generate lengthkZadoff-Chu sequence, by reception antenna and radio-frequency front-end it
Afterwards, signal will be received first by balanced device, remove the influence of multipath channel, then by the ZC sequences of reception respectively with the ZC of generation
Sequence makees convolution, each obtained peak position is the value of symbol of a reception, is switched to binary system to get to reception
Bit flows, that is, completes the reception processing of the CCSK systems based on ZC sequences.
Claims (1)
1. a kind of cycle spread spectrum modulation technique based on ZC sequences, including：
Transmitting terminal：
A. binary system bit data flows are set as Bn=(bk-1,n,bk-2,n,...,b1,n,b0,n), wherein bm,n=0 or 1；M=0,
1,...,M-1；N=1,2,3,4 ..., by bit data flows { BnValue of symbol be expressed as { Dn, wherein
B. it is M=2 to generate length by stationary phase mapperkZadoff-Chu sequence, be set as
The corresponding cyclically shifted sequences that move to left are
The ZC sequence basic function collections are { P0,P1,...,PM-1}；
C. since CCSK operations are actually the cyclic shift to time-domain signal, by value of symbol { DnBe mapped as to basic function ZC sequences
Arrange P0Cyclic shift number, obtain sequence sets { P 'n, it is equivalent to the following mapping of realization in time domain：
D. by above-mentioned signal sn=P 'n, n=1,2 ... pass through digital analog converter, transmitting signal is obtained after power amplifier；
Receiving terminal：
E. it after receiving signal by reception antenna, by it by analog-digital converter, receives signal and is represented by：
rn=sn+Nch, n=1,2 ...
Wherein NchFor the influence of multidiameter fading channel；
F. the docking collection of letters number carries out channel equalization, so that signal removal multidiameter fading channel is influenced, obtains sequence sets { P "n, n=1,
2,...；
G. due to eliminating the influence of multipath channel, ZC sequences P " is receivednIt can be considered the ZC sequences P ' of transmissionn, by { P "nInput
Correlator carries out CCSK demodulation；Due to the good autocorrelation performance of ZC sequences and good cross correlation, i.e., for arbitrary
The sequence of gained is orthogonal after Zadoff-Chu original series and its loopy moving n, and autocorrelation peak is sharp, and cross-correlation
With partial correlation values close to zero, thus reception sequence is related to original ZC sequences work, i.e.,
ri,n=P "n*P′n；I=1,2 ..., 2M-1；N=1,2 ...
Then n is fixed, r is found outi,nIn maximum value, peak value position is data symbol value D 'n；
H. by data symbol value { D 'n, n=1 2 ..., is converted into binary system bit stream, obtains and receives data.
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| CN107994922A (en) * | 2017-12-05 | 2018-05-04 | 上海无线电设备研究所 | A kind of method and its system for improving spread spectrum system traffic rate |
| FR3093257B1 (en) * | 2019-02-27 | 2021-03-12 | Ternwaves | ZADOFF-CHU SEQUENCE MODULATION METHOD AND DEVICE |
| WO2021254634A1 (en) * | 2020-06-19 | 2021-12-23 | Huawei Technologies Co., Ltd. | Generalized orthogonal chirp waveform |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101330356A (en) * | 2007-06-20 | 2008-12-24 | 北京三星通信技术研究有限公司 | Device and method for transmitting broadcast information in a wireless communication system |
| CN101636937A (en) * | 2007-03-16 | 2010-01-27 | Lg电子株式会社 | Method of generating random access preambles in wireless communication system |
| CN103929825A (en) * | 2014-04-30 | 2014-07-16 | 电子科技大学 | Multi-user detection method based on ZC sequence |
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| CN101636937A (en) * | 2007-03-16 | 2010-01-27 | Lg电子株式会社 | Method of generating random access preambles in wireless communication system |
| CN101330356A (en) * | 2007-06-20 | 2008-12-24 | 北京三星通信技术研究有限公司 | Device and method for transmitting broadcast information in a wireless communication system |
| CN103929825A (en) * | 2014-04-30 | 2014-07-16 | 电子科技大学 | Multi-user detection method based on ZC sequence |
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