基于循环谱的MSK信号参数改进估计算法

摘要

The cyclic spectrum theory is applied to estimate parameters of MSK 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 once, which can reduce the computing time and avoid multi-dimentional search. The performance of 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.%利用循环谱理论对最小频移键控MSK信号的载频和码元速率进行参数估计，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参数估计，提出了一种改进算法，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。