DSSS系统PN码捕获的相关峰优化及自适应门限检测  

Correlation signal power optimization and adaptive threshold detection for PN code acquisition in DSSS systems

作　　者：吴玉成[1] 黄文群[1] 

机构地区：[1]重庆大学通信工程学院,重庆400044

出　　处：《电路与系统学报》2010年第2期113-117,共5页Journal of Circuits and Systems

基　　金：国家自然科学基金(60872038);中国博士后基金(20090450787);重庆市教委科技项目(KJ08A09);重庆大学"211工程"创新人才培养计划(S-09102)

摘　　要：针对直接扩频系统的PN码捕获问题提出了一种基于恒虚警概率自适应门限算法的改进方案。方案通过将相邻两个符号长度内接收信号的相关峰值及平均能量对应相乘构造出新的统计量,并用随噪声能量及信噪比变化的自适应门限代替原有的固定门限判决统计量,以达到提高系统检测性能的目的。理论分析和仿真结果表明,改进方案较原方案的PN码捕获性能有很大的提高。An improved pseudonoise （PN） code acquisition scheme based on an adaptive threshold algorithm with constant false alarm probability for the direct-sequence spread-spectrum systems is proposed. To improve the detection performance, correlation signal power and average signal power of two adjacent sign are multiplied correspondingly; also, instead of a fixed threshold, an adaptive threshold varying with noise power and signal-to-noise rate is used to adjudge the variable. Theory analysis and simulation results show that the improved scheme can obtain a better acquisition performance than the original one.

关 键 词：直接序列扩频 捕获 自适应门限 虚警概率 

分 类 号：TN911[电子电信—通信与信息系统]