基于二次谱的直扩信号伪码周期估计方法研究  

Research on the Periodic Estimation Method for PN Sequence Code in DS-SS Signal Based on the Spectrum Reprocessing Algorithms

作　　者：滕振宇[1] 耿欣欣[1] 周帆[1] 冯永新[1] 

机构地区：[1]沈阳理工大学通信与网络工程中心

出　　处：《电子技术（上海）》2015年第1期17-20,共4页Electronic Technology

基　　金：辽宁省科技厅项目(20121038);北京交通大学轨道交通控制与安全国家重点实验室开放课题基金资助(RCS2012K012);新世纪优秀人才支持计划(NCET-11-1013);辽宁省教育厅科学技术研究项目(L2012065;L2013085)

摘　　要：文章采用二次功率谱法实现直接序列扩频信号(DS/SS信号)伪码周期的估计,此方法是对接收信号求得一次功率谱后再进行第二次求功率谱处理,最终得到信号的二次谱在信号伪码周期整数倍处出现一系列的尖峰脉冲,脉冲间距即为伪码周期。通过对二次谱法进行仿真实验,结果表明在较低信噪比条件下能够实现直扩信号的伪码周期估计;准确估计时所需的信噪比容限随着伪码周期的增加而逐渐降低。The paper uses spectrum reprocessing method to achieve the periodic estimation of PN sequence code in direct sequence spread spectrum （DS/SS） signal. The method carries out the second calculation of power spread after computing the power spectrum of the received signals at the first step. Finally the power spectrum reprocessing results will appear spectral line with integral equal to the period of PN sequence and pulse spacing is the PN sequence. The computer simulation results show that the proposed method can well realize the periodic estimation of PN Sequence in DS-SSsignal under the lower SNR input signals. The SNR tolerance for accurate estimation is getting lower as the increase ofpseudorandom code period.

关 键 词：直接序列扩频信号 伪码周期 二次谱 

分 类 号：TN975[电子电信—信号与信息处理]