DSSS-Chirp信号循环平稳特征分析及参数估计

摘要

For the hybrid communication system DSSS-Chirp, it is consisted with direct sequence spread spectrum and the linear frequency modulation signal, by the cyclostationary transform theory, on the cyclic domain feature analysis, the DSSS-Chirp signal cyclic spectrum density function and the cyclic auto-correlation function are obtained. In cycle frequency section, the adjacent line interval size is the symbol rate, according to this cycle domain speciifc features, the symbol rate of estimation algorithm is given based on the cyclic auto-correlation function section. Finally the simulation veriifed the feasibility of the proposed algorithm.%针对直接序列扩频与线性调频信号的混合通信系统,即DSSS-Chirp,利用循环平稳变换理论,对其循环域特征进行分析,得出DSSS-Chirp信号的循环谱密度函数及循环自相关函数,在循环频率切片上,其相邻谱线间隔大小均为符号速率,根据此循环域特征特,给出了基于循环自相关函数切片的符号速率估计算法,最后通过仿真验证了该算法的可行性。