| 多径环境下的直扩信号伪码周期估计 |
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| 引用本文： | 张天骐,苗圃,马国宁,张伟,刘燕丽.多径环境下的直扩信号伪码周期估计[J].电波科学学报,2009,24(5). |
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| 作者姓名： | 张天骐 苗圃 马国宁 张伟 刘燕丽 |
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| 作者单位： | 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
2. 中国工程物理研究院电子工程研究所,四川,绵阳,621900 |
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| 基金项目： | 国家自然科学基金一中物院NSAF联合基金，重庆市科委信号与信息处理重庆市市级重点实验室建设，重庆市自然科学基金计划 |
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| 摘 要： | 针对低信噪比条件下多径直接序列扩频(直扩)信号伪码周期估计的难题,拓展了先前提出的单径环境下基于信号功率谱二次处理的方法,提出了在低信噪比条件下多径环境中直扩信号的伪码周期估计的二次谱算法.该算法首先对多径直扩信号求取功率谱,然后将所得到的功率谱作为一输入信号求其第二次功率谱,所得二次功率谱将在伪码周期整数倍处出现代表信号存在的尖峰脉冲,通过对这些尖峰脉冲闻的距离进行检测就可以获得多径直扩信号伪码周期参数的检测估计.理论分析和计算机仿真结果表明:该算法可以有效地估计出多径环境下直扩信号的伪码周期,且估计性能和多径环境密切相关.
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| 关 键 词： | 直扩信号 多径环境 伪码序列 功率谱 |
Period estimation of the PN sequence for direct sequence spread spectrum in multipath environment |
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| ZHANG Tian-qi MIAO Pu MA Guo-ning ZHANG Wei LIU Yan-li,Chongqing University of Posts , Telecommunications,Chongqing ,China,.Institue of Electronic Engineering,China Academy of Engineering Physics,Mianyang Sichuan ,China.Period estimation of the PN sequence for direct sequence spread spectrum in multipath environment[J].Chinese Journal of Radio Science,2009,24(5). |
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| Authors: | ZHANG Tian-qi MIAO Pu MA Guo-ning ZHANG Wei LIU Yan-li Chongqing University of Posts Telecommunications Chongqing China Institue of Electronic Engineering China Academy of Engineering Physics Mianyang Sichuan China |
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| Affiliation: | ZHANG Tian-qi1 MIAO Pu1 MA Guo-ning2 ZHANG Wei2 LIU Yan-li1(1.Chongqing Key Laboratory of Signal , Information Processing(CqKLS&IP),Chongqing University of Posts , Telecommunications,Chongqing 400065,China,2.Institue of Electronic Engineering,China Academy of Engineering Physics,Mianyang Sichuan 621900,China) |
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| Abstract: | In this paper,an algorithm reprocessing of the power spectrum density is proposed to detect and estimate the PN sequence period of the multipath DS/SS signal in low SNR,which develops the previous processing method based on the single path environment.It can solve the difficult problem of PN sequence's periodic detection and estimation in multipath environment.In the algorithm,the power spectrum density of signals is firstly obtained,and then is treated as an input signal to compute its reprocessing power s... |
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| Keywords: | direct sequence spread spectrum multipath environment PN sequence power spectrum density |
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