扩频同步系统自适应门限检测方法研究  

A Method of Adaptive Threshold Detection in the Synchronization for Spread Spectrum Systems

作　　者：卓建荣[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2007年第9期23-25,共3页Radio Engineering

摘　　要：提出了一种用于扩频同步中的自适应门限检测方法,该方法在自适应基本理论的基础上,采用自动检测电路,调整捕获门限值随着接收信号电平值的大小而改变,从而克服了多径和多址干扰对同步的影响。理论分析和仿真试验表明,自适应门限检测器的虚警概率、漏检概率和平均捕捉时间性能均明显优于固定门限检测器。A method of adaptive threshold detection in the synchronization for spread spectrum systems is proposed. Based on the basic adaptive theory and the synchronization principles of direct sequence, this paper studies how to overcome the influences of multi-path and multiple-access interference on synchronization by using adaptive detection algorithms to make the threshold change with the received signal＇s level in acquisition. Theoretical analysis and simulation are carried out and show that the performance of Adaptive Threshold Detector is preferable to the Fixed Threshold Detector from aspects of false alarm probability, missing probability, and average acquisition time.

关 键 词：直扩信号 门限检测 自适应控制器 虚警概率 同步技术 

分 类 号：TN914.42[电子电信—通信与信息系统]