基于DMF直扩系统捕获性能的研究  

Performance of Acquisition in a Matched-filter for DSSS

作　　者：黄振[1] 陆建华[1] 杨士中[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《电路与系统学报》2002年第1期92-95,共4页Journal of Circuits and Systems

摘　　要：对以数字匹配滤波器(DMF)为核心的捕获电路的性能进行了深入研究,推导出单次、两次驻留判决方式的平均捕获时间的表达式,并进行了数值分析。得出的主要结论是:基于DMF的捕获电路具有很快的捕获速度,适合于猝发通信;低信噪比下,捕获速度对门限更为敏感,且两次驻留判决在低信噪比下略好于单次驻留判决。The digital matched filter(DMF) is studied extensively in order to derive the analytic expressions of the PN code acquisition by one dwell decision and two dwell decision approaches respectively. Numerical analysis is also given. It is shown that the proposed circuit based on the DMF can accelerate the process of PN code acquisition. Therefore, It is beneficial to the burst mode transmissions. Under the condition of low SNR, The speed of PN code acquisition is sensitive to the threshold of detector, in such circumstance, the approach of two dwell decision has better performance than the approach of one dwell decision.

关 键 词：数字匹配滤波器 检测概率 虚警概率 直扩系统 捕获性能 

分 类 号：TN914.4[电子电信—通信与信息系统] TN713[电子电信—信息与通信工程]