直扩信号载频、码元速率循环谱估计改进算法

Innovatory estimation algorithm of carrier frequency and chip-rate for DS-SS signal based on cyclic spectrum amplitude

利用循环谱理论对BPSK直接序列扩频信号进行参数估计,分析了其循环谱包络特征;在有限数据下,为实现更低信噪比情况下的直扩信号参数估计,提出了1种改进算法,该算法基于数据分段处理和重叠保留,通过在非零循环频率上的2次一维搜索实现参数估计,能够有效地抑制噪声的影响,避免多维搜索,计算量小;还分析了算法性能,给出了算法实现的具体步骤,并进行了计算机仿真。仿真结果证明了所提出算法的有效性。

The cyclic spectrum theory is applied to estimate parameters of BPSK DS-SS signal,and the cyclic spectrum amplitude of the signal is analyzed.An innovatory estimation algorithm is proposed to realize parameters estimation of DS-SS signal in limited data length.The algorithm based on data division and overlap reservation can restrain noise effectively.The estimation is realized by searching in non-zero cyclic frequencies twice,which can reduce the computing time and avoid multi-dimentional search.The performance of the algorithm is analyzed,the procedure is given and the computer simulation test is offered.The simulation results have proved that the validity of the method.