| 基于模糊函数的直扩信号多参数估计 |
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| 引用本文： | 石明军,徐振平,肖立民,周世东,姚彦. 基于模糊函数的直扩信号多参数估计[J]. 清华大学学报(自然科学版), 2009, 0(10): 1619-1622 |
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| 作者姓名： | 石明军 徐振平 肖立民 周世东 姚彦 |
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| 作者单位： | 清华大学,电子工程系,北京,100084;国防科技大学,电子科学与工程学院,长沙,410073 |
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| 基金项目： | 国家“八六三”高技术项目(2007AA01Z2b6);;国家“九七三”重点基础研究项目(2007CB310608) |
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| 摘 要： | 为解决低信噪比下直扩信号的参数盲估计问题,提出了一种基于模糊函数的直扩信号载频、码率和伪码周期估计新方法。对直扩信号的模糊函数进行了推导和分析,发现直扩信号模糊函数在特定延时和频率上有明显特征对应载频、码率和伪码周期等参数,给出了直扩信号参数估计的具体算法。仿真实验表明在扩频码长为63及码元数为16条件下,载频和码率估计可工作在-12 dB,扩频周期估计可工作在-6 dB低信噪比条件下。该方法可用于非合作通信中直扩信号的参数估计。
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| 关 键 词： | 直接序列扩频 参数估计 模糊函数 |
Multiple parameters estimation of the direct sequence spread signal based on ambiguity function |
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| SHI Mingjun,XU Zhenping,Xiao Limin,ZHOU Shidong,YAO Yan. Multiple parameters estimation of the direct sequence spread signal based on ambiguity function[J]. Journal of Tsinghua University(Science and Technology), 2009, 0(10): 1619-1622 |
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| Authors: | SHI Mingjun XU Zhenping Xiao Limin ZHOU Shidong YAO Yan |
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| Affiliation: | 1.Department of Electronic Engineering;Tsinghua University;Beijing 100084;China;2.College of Electronic Science and Engineering;NUDT;Changsha 410073;China |
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| Abstract: | An ambiguity function(AF) method was developed to estimate the carrier frequency,chip rate and periods of pseudo-random(PN) codes for blind parameter estimates of direct spread spectrum signals(DS-SS) in low signal-to-noise ratio(SNR) environments.The average ambiguity function for DS-SS has simple relationship between the AF characteristics and the carrier frequency,chip rate and PN periods.Simulations with a data set having 63 bit PN codes and 16 symbols show that the carrier frequency and chip rate estim... |
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| Keywords: | direct sequence spread spectrum signal parameter estimation ambiguity function |
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