| 一种PN码捕获的门限自适应估计方法 |
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| 引用本文： | 薛巍,向敬成,周治中. 一种PN码捕获的门限自适应估计方法[J]. 电子学报, 2003, 31(12): 1870-1873 |
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| 作者姓名： | 薛巍 向敬成 周治中 |
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| 作者单位： | 1. 电子科技大学电子工程学院,四川成都 610054;2. 中电集团第30研究所,四川成都 610041 |
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| 摘 要： | 该文提出一种简单、实用的PN码捕获门限自适应设置方法.我们在对判决量统计特性分析的基础上,采用最大似然估计准则估计出等效高斯白噪声方差V.由此,我们得到了判决门限值的自适应设置方法.最后,我们进行了计算机仿真.结果表明,通过估计门限构造出的PN码捕获装置检测性能与理论值非常吻合,从而说明了其有效性.而且,判决门限的估计方法实现非常简单、快捷,很适合在工程中应用.
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| 关 键 词： | PN码捕获 判决门限 最大似然估计 |
| 文章编号： | 0372-2112(2003)12-1870-04 |
| 收稿时间： | 2002-10-22 |
An Adaptive Threshold Estimation Method for PN Code Acquisition |
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| XUE Wei ,XIANG Jing cheng ,ZHOU Zhi zhong. An Adaptive Threshold Estimation Method for PN Code Acquisition[J]. Acta Electronica Sinica, 2003, 31(12): 1870-1873 |
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| Authors: | XUE Wei XIANG Jing cheng ZHOU Zhi zhong |
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| Affiliation: | 1. College of Electronic Engineering,University of Electronics Science and Technology of China,Chengdu,Sichuan 610054,China;2. No.30 Institute of CETC,Chengdu,Sichuan 610041,China |
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| Abstract: | This paper proposes a simple and practical threshold adaptive estimating method for PN code acquisition.After analyzing the statistical property of the decision variable,we use the Maximum Likelihood (ML) criterion to adaptively estimate the variance of the Gaussian noise.Thus,we get the decision threshold.The performance of the acquisition method using estimated threshold got by computer simulation is very close to the theoretical one's,which shows that the proposed method is useful.Furthermore,for the threshold's estimation method is very simple and fast,it is very fit for practical application. |
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| Keywords: | PN code acquisition decision threshold maximum likelihood estimation |
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