A cyclic spread spectrum modulation method based on zc sequence

A spread spectrum modulation and sequence technology, applied in the field of radar, can solve the problems of low detection rate and low acquisition probability, and achieve the effect of low interception, high spectral efficiency and excellent bit error rate performance.

Active Publication Date: 2018-09-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The cyclic spread spectrum modulation based on the Zadoff-Chu sequence, first of all, due to the constant envelope of the ZC sequence itself, ensures the constant envelope of the transmitted signal and solves the peak to average power ratio (Peak to Average Power Ratio, PAPR) problem of the signal. The system is not affected by the nonlinear distortion of the power amplifier; on the other hand, since the CCSK modulation only changes the phase characteristics of each element in the ZC sequence, the modulated data still has flat power spectrum characteristics, with low capture probability and low detection rate

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  • A cyclic spread spectrum modulation method based on zc sequence
  • A cyclic spread spectrum modulation method based on zc sequence
  • A cyclic spread spectrum modulation method based on zc sequence

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[0026] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0027] The traditional CCSK coded spread spectrum is to select a function f(t) with excellent periodic autocorrelation characteristics as the basis function S 0 , and use S 0 and its cyclic shift sequence S 1 ,S 2 ,...,S M-2 ,S M-1 Indicates data information, which is obtained by mapping data information to a cyclic shift function set and modulating a carrier.

[0028] In most cases, the basis function is a binary sequence, S 0 =(b 0 ,b 1 ,b 2 ,...,b M-2 ,b M-1 ), b m =±1(0≤m≤M-1), M basis function length, the corresponding left-shift cyclic shift sequence is S 1 =(b 1 ,b 2 ,...,b M-2 ,b M-1 ,b 0 ), S 2 =(b 2 ,b 3 ,...,b M-2 ,b M-1 ,b 0 ,b 1 ),…, the function set {S 0 ,S 1 ,...,S M-1} M elements can represent kbit data information at most: 2 k = M, the mapping method mostly uses the kbit symbol value to correspond to the shift value...

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Abstract

The invention belongs to the technical field of radar and relates to a ZC sequence-based cyclic spread spectrum modulation method. The present invention proposes a time-domain CCSK modulation scheme based on the constant envelope of the Zadoff-Chu sequence as a basis function on the traditional CCSK modulation scheme, and generates a Zadoff-Chu sequence of the same length at the sending end and the receiving end, as The basis function maps the binary bit stream to a symbol value first, and then regards each symbol value as a cyclic shift of the basis function once, and maps the symbol value to a cyclically shifted ZC sequence set, which is the transmitted signal. Since the basis function is known, it is a Zadoff-Chu sequence, so using its good autocorrelation and cross-correlation, at the receiving end, after the received signal is equalized, it is convolved with the generated ZC sequence to obtain the peak value The position is the received symbol value, which is converted into binary to obtain the received bit stream.

Description

technical field [0001] The invention belongs to the technical field of radar, and relates to a ZC (Zadoff-Chu) sequence-based cyclic spread spectrum modulation (Cyclic Code Shift Keying, CCSK) method. Background technique [0002] With the development of electronic technology, the electromagnetic environment of modern cities is becoming more and more complex, and the means of interception are becoming more and more advanced, which puts forward higher requirements for the communication system: the system needs to adopt the pulse transmission technology to shorten the signal pulse and conceal the signal Enhanced performance; use spread spectrum, frequency hopping, encryption and other technologies to improve the system's anti-jamming and anti-interception capabilities. At the same time, under the condition of ensuring high signal concealment and LPI-LPD, real-time transmission of large-capacity information on a limited channel bandwidth has become an urgent goal of modern secu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707
CPCH04B1/707
Inventor 胡苏黄驿轩郭惠婷柴胜均石荣
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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