空域捕获系统的性能分析  

Performance of Acquisition in a Receiver Based on Spatial Processor

作　　者：谭晓衡[1] 陈丽[1] 唐马可[1] 

机构地区：[1]重庆大学通信工程学院,重庆400030

出　　处：《重庆大学学报（自然科学版）》2008年第1期43-47,共5页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(30570473);重庆市自然科学基金资助项目(2005BB2195)

摘　　要：对基于空域处理器和数字匹配滤波器(DMF)的捕获系统在非衰落信道下的捕获性能进行讨论,利用状态转移图推导出单次驻留判决方式时平均捕获时间的表达式,并进行了数值分析。结果表明:对于非衰落信道,单天线接收的信噪比越低,采用空域处理器对捕获性能改善的效果就越明显,且阵元数越多捕获性能越好;如果单天线接收的信噪比高于一定的值,采用空域处理器的效果就不明显,且随着天线阵元数的增加,系统的平均捕获时间反而增加;在虚警概率一定的情况下,存在一个最佳的阵元数m,使系统的平均捕获时间最小。A receiver based on a spatial processor and digital matched filter （DMF） is studied extensively in order to evaluate the performance of PN code acquisition. By using a state transition diagram, we derive the analytic expressions of the receiver＇s mean acquisition time based on a spatial processor and DMF in a AWGN channel. Numerical analysis is also given in this paper. It is shown that the proposed receiver based on a spatial processor and DMF can accelerate the process of PN code acquisition. If the signal-to-noise ratio is low, then a larger number of angular cells m are required to obtain a minimum mean acquisition time. With larger signal-to-noise ratios, only a few regions are required to achieve the same goal. Based on the assumption that the false alarm is constant, there exists an optimum number of angular cells m that minimizes the mean acquisition time.

关 键 词：阵列天线 空域处理器 数字匹配滤波器 平均捕获时间 

分 类 号：TN911[电子电信—通信与信息系统]