直接序列扩频通信系统同步技术的研究  

Synchronization technology of DS/SS communication system

作　　者：李白萍[1] 林少锋[1] 孙伟峰[1] 

机构地区：[1]西安科技学院通信与信息工程学院,陕西西安710054

出　　处：《西安科技学院学报》2003年第2期202-204,228,共4页

基　　金：陕西省教育基金项目(01JK193)

摘　　要：扩频码的捕获和跟踪,是DS/SS系统正常工作的前提条件。由于无线信道的载波偏移、多普勒效应以及收发信机的相对移动等特性引发了同步的不确定性,接收机要对信息进行解调,就必须解决精确的码同步技术问题。作者在分析比较两种典型的同步实现方案的基础上提出了改进方法。理论分析可知,串并捕获方案可克服并行捕获硬件复杂度高、串行捕获时间长的缺点;计算机仿真结果表明,平衡式BPSK匹配滤波器不采用跟踪支路就可实现伪码精确同步。Synchronization of pseudo noise is a premise condition for DS/SS working normally. But the unascertaining of synchronization is occurred because of carrier frequency offset, dopple effect and related moving of receivers etc. For correct demodulation of information the problem for accurate synchronization should be solved. Two typical synchronization methods are analyzed and two novel methods are developed. The theoretical analysis suggests that serialparallel acquisition can eliminate the complexity of parallel acquisition and reduce the time of serial acquisition. The simulication results show that the balanced BPSK match filter can synchronize precisely.

关 键 词：伪码同步 码相位捕获 扩频序列 

分 类 号：TN914.4[电子电信—通信与信息系统]