基于循环谱的改进BPSK直扩信号检测算法

摘要

In limited data length, an improved algorithm based on data division and overlap reservation is proposed to realize detection of Direct Sequence Spread Spectrum(DS-SS) signal in low Signal Noise Ratio(SNR). The signal detection is realized by one-dimensional search in non-zero cyclic frequencies without prior knowledge. Experimental results show that the algorithm can restrain noise effectively, and it has a good detecting ability of DS-SS signal in low SNR.%在有限数据长度条件下,针对低信噪比下的二相相移键控(BPSK)直接序列扩频(DS-SS)信号,提出一种基于数据分段和重叠保留处理的改进检测算法.该算法无需信号的先验知识,通过在非零循环频率上的一维搜索实现信号检测.实验结果表明,该算法能有效抑制噪声,在低信噪比下对于DS-SS信号具有较好的检测性能.