一种用于CDMA2000 1x导频捕获的自适应门限算法研究  

A novel adaptive threshold algorithm used for CDMA2000 1x pilot channel capture

作　　者：王文实 夏文龙[1] 郭庆功[1] Wang Wenshi;Xia Wenlong;Guo Qinggong(School of Electronic Information, Sichuan University, Chengdu 610025, China)

机构地区：[1]四川大学电子信息学院,四川成都610025

出　　处：《信息技术与网络安全》2018年第4期79-83,共5页Information Technology and Network Security

摘　　要：移动通信智能干扰要求对周围基站进行检测,快速解调分析基站信息,并生成带有基站信息的干扰信号,因此,需要快速准确地捕获和跟踪基站信息。提出了一种基于部分匹配滤波-短时相关(Partial Matched Filters and Fast Fourier Transform,PMF-FFT)的自适应门限捕获算法,用于CDMA2000 1x制式中PN序列的初始捕获。使用PMF-FFT进行快速计算,使用功率图谱累积法增大弱信号下的相关峰值;使用自适应捕获门限提高低信噪比下的检测概率,提升捕获性能。同等计算复杂度和零虚警概率下,导频信噪比为-27 d B时,捕获概率较固定门限由0.3提高到0.9,性能提升约4 d B。Intelligent jamming for mobile communication needs to detect and demodulate information of surrounding base stations,then generate jamming signal similar to base station signal. Therefore,quickly acquisition and track the base station signal is necessary. A novel adaptive threshold algorithm based on PMF-FFT is proposed for the initial acquisition of PN sequence in CDMA2000 1 x. PMF-FFT is used for quick calculation,and the power spectrum accumulation method is used for increasing the correlation peak of weak signal. Adaptive acquisition threshold is used to improve the detection probability under low SNR and increase acquisition performance. In the same computational complexity and false alarm probability,when the pilot SNR is-27 d B,acquisition probability increased from 0. 3 to 0. 9 compared with the fixed threshold,about 4 d B performance improved.

关 键 词：CDMA2000 1x 部分相关 伪码捕获 自适应门限 

分 类 号：TN967[电子电信—信号与信息处理]