基于Duffing振子的直接序列扩频信号检测及参数估计

针对直接序列扩频信号检测中信号特征提取的问题,提出了利用Duffing振子对小信号的敏感性和对噪声的免疫性来检测信号的这些特征信息。以基于Duffing振子的载波检测为例,进行了分析和仿真,给出了直接序列扩频信号的幅度、相位和载频的估计值。仿真表明,所提的方法可以获得很好的检测性能,能检测到信噪比为-38.35 dB的DSSS/BPSK信号。

Detection and parameters estimation of direct sequence spread spectrum signals based on Duffing oscillators

Detection of direct sequence spread spectrum(DSSS) signals is usually carried out through acquiring some characters of the signals according to some algorithms,and these characters are usually periodic.Then these characteristic messages can be detected by making use of Duffing oscillator's sensibility to small periodic signals and immunity against noise.Taking carrier detection of DSSS/BPSK signals as an example,a good detection performance is obtained and the estimated values of amplitude,carrier frequency and phase of the signal are given.Simulation results show that the DSSS/BPSK signal with SNR to-38.35dB can be detected by the method.