多径环境下TDDM-BOC信号伪码周期估计  

Period Estimation of PN Sequence for TDDM-BOC Signal in Multipath Environment

作　　者：周杨[1] 张天骐[1] 钱文瑞[1] 

机构地区：[1]重庆邮电大学信号与信息处理重庆市重点实验室,重庆400065

出　　处：《电讯技术》2015年第6期651-657,共7页Telecommunication Engineering

基　　金：国家自然科学基金资助项目(61371164;61275099;61102131);重庆市自然科学基金资助项目(CSTC2012JJA40008);重庆市杰出青年基金项目(CSTC2011jjjq40002);重庆市教育委员会科研项目(KJ120525;KJ130524);重庆市研究生科研创新项目(CYS14140);信号与信息处理重庆市市级重点实验室建设项目(CSTC2009CA2003)~~

摘　　要：针对低信噪比下存在多径效应的时分数据调制二进制偏移载波(TDDM-BOC)调制信号的伪码周期估计难题,提出了一种基于二次谱的TDDM-BOC信号伪码周期估计算法。该算法首先推导出多径环境下TDDM-BOC信号模型,然后求出多径TDDM-BOC信号的功率谱,再求其二次谱,最后通过检测二次谱的尖峰脉冲间的间距得到多径环境下TDDM-BOC信号的伪码周期。实验过程中采用累加平均的方法可以达到降噪和精确估计的目的。仿真结果表明:该算法能够在多径环境下对TDDM-BOC信号伪码周期进行有效估计,且估计性能与多径环境有密切关系,这为今后我国"北斗"导航接收设备的开发提供了一定的理论参考。For the problem set Cartier（TDDM-BOC） of estimating pseudo-code period of Time signal Division Data Modulation-Binary Off- with muhipath effect under low signal-to-noise ratio（ SNR）, an algorithm based on quadratic spectrum is proposed to estimate the pseudo-code period of TDDM-BOC signal. First- ly,the TDDM-BOC signal model in muhipath environment is derived. Then the power spectrum of the muhipath TDDM-BOC signal is found ,its secondary spectrum can be obtained by using Fourier transform of the power spectrum. Finally,the pseudo-code period of TDDM-BOC signal in muhipath environment can be got by detecting spacing between peak pulses. The method of accumulative average is adopted to a- chieve the purpose of noise reduction and accurate estimation. Simulation results show that the pseudo- code period of TDDM-BOC signal in multipath environment is effectively estimated by using the algorithm and its performance closely relates with the multipath environment. It has a certain reference value for Bei- dou navigation receiver design.

关 键 词：卫星导航系统 TDDM-BOC信号 多径环境 二次谱 伪码周期估计 

分 类 号：TN911.7[电子电信—通信与信息系统]