大频偏低信噪比下DS/SS系统中的扩频序列捕获研究
Investigation of PN acquisition under large frequency offset and low signal to noise ratio in DS/SS systems
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摘要: 该文研究大频偏低信噪比情况下DS/SS系统中的序列捕获问题，介绍了一种基于非相干序贯检测算法的捕获结构。主要考虑了频偏和GOLD码部分相关对参数选择的影响。理论分析和计算机仿真结果均表明，采用这种结构，在低信噪比和较大的频偏下能得到较好的捕获效果，而且其实现的复杂度不高。
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关键词:
- 序列捕获; 序贯检测; 频偏; 部分相关
Abstract: This paper presents a structure based on noncoherent-SPRT algorithm for the sequence acquisition under large frequency offset and low signal to noise ratio in DS/SS systems. The emphasis is put on the effect of frequency offset and partial correlation of GOLD sequence on parameters. It is shown by the theoretical analysis and computer simulation that the good acquisition performance can been achieved. And this structure can been implemented with moderate complexity. -
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