使用最优化搜索算法的快速相干捕获方法  

Coherent Acquisition Scheme for PN Sequences Using Optimization Method and Auxiliary Sequence

作　　者：宋阳[1] 胡光锐[1] 

机构地区：[1]上海交通大学电子工程系,上海200030

出　　处：《上海交通大学学报》2003年第10期1596-1599,共4页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(60172018);国防重点实验室基金项目(51473030101JW0301)

摘　　要：提出了将最优化搜索算法中试错法应用于直接序列扩频(DS/SS)系统中加速捕获.利用输入信号与本地辅助序列相关值可以提供搜索方向信息的特性,系统使用试错法获得输入信号相位所在高概率区间,由相位定位检测器在此区间搜索输入信号的准确同步相位.分析结果表明,提出的捕获方案的同步进程明显快于传统的串行相干扰获方法.A coherent acquisition scheme for directsequence spreadspectrum(DS/SS)receivers was proposed. Since the crosscorrelation value between the incoming PN signal and the auxiliary sequence has linear magnitude, and can provide the direction for the phase updating, an optimization method (try and error method) can be adopted to obtain the phase region information of the incoming signal. The mean acquisition time was derived by the signal flow graph theory and compared with that of the conventional serial search scheme. The results show that the proposed scheme achieves the course acquisition significantly faster than the conventional scheme.

关 键 词：直接序列扩频通信 捕获 辅助序列 通信抗干扰 

分 类 号：TN914.4[电子电信—通信与信息系统]