| 基于最大熵PDF估计的直扩系统伪码捕获结构 |
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| 引用本文： | 徐定杰,赵国清,王伟.基于最大熵PDF估计的直扩系统伪码捕获结构[J].武汉理工大学学报,2010(8). |
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| 作者姓名： | 徐定杰 赵国清 王伟 |
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| 作者单位： | 哈尔滨工程大学自动化学院; |
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| 基金项目： | 国家自然科学基金(60704018) |
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| 摘 要： | 为了使直扩系统在未知非高斯噪声模型下准确地捕获微弱直扩信号,提出一种新的基于整数最大熵概率密度函数(probability density function,PDF)估计和局部最佳检测(locally optimal detection,LOD)相结合的相关前一维幅域处理捕获方式。通过蒙特卡洛数据仿真可以发现:在非高斯噪声的情况下,基于整数最大熵PDF估计的LOD检测器的检测性能要明显优于常规平方和(Square-Sum,SS)检测器,在信噪比为-25~0 dB时分别有2.0%~99.0%的改善。从根本上改变了常规SS检测器在非高斯噪声模型下性能急剧下降甚至无法工作的现象。
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| 关 键 词： | 直接序列扩频系统 局部最佳检测 非高斯噪声 整数最大熵 概率密度函数 |
PN Code Acquisition Structure of DS/SS Based on Maximum-Entropy PDF Estimation |
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| XU Ding-jie,ZHAO Guo-qing,WANG Wei.PN Code Acquisition Structure of DS/SS Based on Maximum-Entropy PDF Estimation[J].Journal of Wuhan University of Technology,2010(8). |
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| Authors: | XU Ding-jie ZHAO Guo-qing WANG Wei |
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| Affiliation: | XU Ding-jie,ZHAO Guo-qing,WANG Wei(Automation College,Harbin Engineering University,Harbin 150001,China) |
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| Abstract: | In order to acquire the weak direct sequence spread spectrum(DS/SS) signal in the unknown non-Gaussian noise model for DS/SS system,a new pre-correlation one-dimensional amplitude detection technology based on integral maximum entropy probability density function(PDF) estimation and locally optimal detector(LOD) is proposed in this paper.The Monte Carlo simulation result shows that when the noise is non-Gaussian,the detection probability of LOD based on integral maximum entropy PDF estimation exceeds the co... |
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| Keywords: | direct sequence spread spectrum system(DS/SS) locally optimal detection(LOD) non-Gaussian noise integral maximum entropy probability density function(PDF) |
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