Estimation method of DS (direct sequence)/FH (frequency hopping) spread spectrum signal parameters based on cyclic spectrum theory

A spread spectrum signal and parameter estimation technology, which is applied to baseband system components, shaping networks in transmitters/receivers, electrical components, etc., can solve the problem of DS/FH spread spectrum signal parameter estimation performance degradation and cyclic spectrum estimation accuracy And stability decline, sample length becomes shorter, etc., to overcome the decline in estimation performance, reduce estimation error, and achieve the effect of high process feasibility

Inactive Publication Date: 2011-08-17
XIDIAN UNIV
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Problems solved by technology

[0005] Although the detection and parameter estimation of the signal can be realized by using the cyclic spectrum theory, due to the hopping of the time domain frequency of the DS / FH spread spectrum signal, the length of the sample for detection is shortened, resulting in the difficulty of parameter estimation of the DS / FH spread spectrum signal. Performance degradation, which greatly reduces the accuracy and stability of single-use cyclic spectrum estimation

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  • Estimation method of DS (direct sequence)/FH (frequency hopping) spread spectrum signal parameters based on cyclic spectrum theory
  • Estimation method of DS (direct sequence)/FH (frequency hopping) spread spectrum signal parameters based on cyclic spectrum theory
  • Estimation method of DS (direct sequence)/FH (frequency hopping) spread spectrum signal parameters based on cyclic spectrum theory

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[0025] 1. Introduction to basic theory

[0026] 1.1) DS / FH spread spectrum theory

[0027] The DS / FH spread spectrum system can be regarded as a direct sequence system in which the carrier frequency is periodically hopped. Adopting the DS / FH spread spectrum method can greatly improve the performance of the spread spectrum system, and has good communication concealment and strong anti-interference ability.

[0028] The DS / FH spread spectrum signal adopts BPSK modulation, and the spread spectrum signal model can be expressed as:

[0029]

[0030] Among them, t is the time, P is the average power of the signal, c k is the product of the PN code sequence and the information code sequence, g(t) is the waveform of the symbol pulse, T a Chip width, k is an integer, f c is the center frequency of the carrier, f k (t)∈{f 1 , f 2 ,L,f N} is the frequency hopping pattern, f 1 , f 2 ,L,f N is the frequency hopping frequency, N is the number of frequency hopping points, P...

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Abstract

The invention discloses an estimation method of DS (direct sequence)/FH (frequency hopping) spread spectrum signal parameters based on a cyclic spectrum theory and a splicing technology, which is mainly used for solving the problem of poor estimation performance of DS/FH spread spectrum signal parameters in the existing method. The estimation method comprises the following steps: firstly pre-estimating carrier frequency and code rate of DS/FH spread spectrum signals according to the cyclic spectrum theory; dividing and extracting the DS/FH spread spectrum signals based on the pre-estimated carrier frequency and code rate; splicing the divided and extracted signals; and finally estimating the carrier frequency and code rate of the spliced signals according to the cyclic spectrum theory. The estimation method has the advantages of strong anti-jamming capability, high parameter estimation accuracy and capability of effectively reducing estimation errors, thus the method can be used for processing communication signals.

Description

technical field [0001] The invention belongs to the field of communication signal processing, relates to cyclic spectrum theory and splicing method, and can be used for parameter estimation of direct sequence / frequency hopping DS / FH spread spectrum signals. Background technique [0002] DS / FH spread spectrum communication system combines the advantages of direct sequence spread spectrum DS and frequency hopping spread spectrum FH, overcomes some shortcomings of both of them, and has low intercept probability, strong resistance to narrowband interference, resistance to near-far effect and resistance to multiple It has been widely used in the field of military communication due to its advantages such as strong diameter effect. With the development and improvement of DS / FH spread spectrum technology, the detection and parameter estimation of such signals has become an urgent problem in the field of communication countermeasures. [0003] Since Geraniotis et al. analyzed the pe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/692H04L25/02H04L25/03
Inventor 金艳赵玉柱姬红兵
Owner XIDIAN UNIV
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