直接序列扩频信号的周期谱密度检测法

A method of detection cyclic spectral density for DS/SS signal

本文针对直接序列扩频(DS/SS)通信系统的可截获性问题,提出了一种新方法,即用周期谱密度检测法,来获取该系统的重要参数,如载波频率、扩频码速率以及信号的调制方式等,从而实现对 DS/SS 信号的识别.最后,对 BPSK 和 QPSK 两种信号的调制方式进行了分析.由于计算中采用了FFT 算法,因此,便于进行实时处理。计算机模拟结果表明,此法是切实可行的。

A new method is presented for solving the interception problem in a direct sequence spread spectrum(DS/SS)communication system,which uses the cyclic spectral density function method to acquire important parameters-the carrier frequency,the rate of spread- ing code and the modulation of signals,etc,thus realizing the recognition of the(DS/SS) signal.Finally,two kinds of modulation signals(BPSK and QPSK)are analyzed.It is con- venient to use algorithmic FFT.Computer simulation shows that the method is practicable.