一种快速实现超宽带信号捕获的算法  

A fast acquisition of ultra-wideband signals

作　　者：肖婕桢[1] 蒋挺[1] 周正[1] 

机构地区：[1]北京邮电大学无线网络实验室,北京100876

出　　处：《电路与系统学报》2007年第6期138-142,共5页Journal of Circuits and Systems

基　　金：教育部科学技术研究重点资助项目(03035);国家自然科学基金资助项目(60372097);国家863资助项目(2003AA123240)

摘　　要：信号的同步是超宽带技术实现和发展的关键环节,本文介绍一种能快速实现超宽带脉冲信号同步的串行捕获算法,即自适应门限块搜索算法。该算法将相位搜索范围进行分块处理,通过对信噪比进行实时估计不断调整其判决门限,达到最佳判决,用较少的硬件代价实现脉冲信号的快速捕获。The acquisition of synchronized signals is a crucial task for the ultra wide bandwidth（UWB） system. In this paper, a new rapid acquisition algorithm, called Sequential Block Search with Automatic Decision Threshold Control （ADTC）, is proposed and studied for UWB system. The algorithm divides the whole uncertainty phase region into blocks and adaptively estimates optimal threshold by exploiting the statistics of the signal and noise. The purpose of the algorithm is to increase the probability of signal detection and reduce the probability of false alarm as well as the mean acquisition time, while maintaining the receiver complexity comparable to the serial search algorithm.

关 键 词：超宽带 捕获 自适应门限 块搜索 相关器 

分 类 号：TN914.3[电子电信—通信与信息系统]