乘性噪声环境下基于局部最佳检测器的伪码捕获方法  

PN Code Acquisition Based on the Locally Optimum Detector in Multiplicative Noise Channels

作　　者：沈锋[1] 徐定杰[1] 薛冰[1] 

机构地区：[1]哈尔滨工程大学自动化学院,哈尔滨150001

出　　处：《电子与信息学报》2009年第8期1952-1956,共5页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60704018)资助课题

摘　　要：扩频系统常常工作在多径环境中,伴随着加性噪声的同时往往还存在着乘性噪声。该文提出了一种乘性噪声环境下伪码捕获方法,将伪码捕获等价为假设检验问题,利用局部最佳检测算法推导出乘性噪声环境下的伪码捕获检测统计量,文中给出了基于局部最佳检测算法的捕获结构,并与传统的平方和检测器进行了性能仿真对比,结果表明该文所提出的捕获方法在乘性噪声环境下检测性能较平方和检测器有较大幅度的提高,而在无乘性噪声的环境下检测性能只较传统的平方和检测器检测性能稍有降低。The spread-spectrum system usually works in the multipath environment, along with the additive noise there always be some multiplicative noise. In order to solve the pseudonoise （PN） code acquisition in multiplicative noise channel, a new detector is proposed in this paper. Modeling the acquisition problem as a hypothesis testing problem, a detector is derived for multiplicative noise, based on the locally optimum detection technique. Numerical results show that the proposed detector can offer substantial performance improvement over the conventional schemes in multiplicative noise channels.

关 键 词：伪码捕获 局部最佳检测 乘性噪声 检测概率 

分 类 号：TN914.4[电子电信—通信与信息系统]