多址干扰下DS／CDMA系统的伪随机码捕捉性能  

PN Code Acquisition Performance in the Presence of Multiple Access Interfence in DS/CDMA System

作　　者：龙必起[1] 张平[1] 胡健栋 

机构地区：[1]北京邮电大学电信工程系

出　　处：《北京邮电大学学报》1995年第4期38-42,共5页Journal of Beijing University of Posts and Telecommunications

摘　　要：研究了一个扩频码分多址（ＤＳ／ＣＤＭＡ）通信系统的伪随机码捕捉性能，伪随机码捕捉采用常用的平方律捕捉检测器。分析了在多址干扰下捕捉性能所受到的影响，模型中假定有ｋ个同时工作的用户，并且到达接收机的所有用户都是等功率的，分析结果表明，随着用户数的增加，多址干扰增大（接收机信噪比恶化），平均捕捉时间迅速增长，同时，检测器的是佳工作门限也随着多址干扰的变化而大幅度变化。门限的选择将严重影响系统的捕捉性能；蒙特卡罗仿真结果同分析结果进行了比较。The acquisition time performance of a k-user DS/CDMA(Direct Sptead/Ode Division Multiple Access) system is examined. The acquisition is accomplished using conventional squarelaw PN cede acquisition detector. The intent of the analysis is to determine how much performance penalty is incurred because of the presence of the multiple user interference. Theanalysis is under the assumption that all the signals from k-user arrive at the receiver w1th raualpower. The analysis indicates that with the numbers of simultaneously working users increasing,the multiple access interference(MAI)will increase(decreasing the output SNR)and the averageacquisition time grow also. Meantime,the optimum threshold largely varied with different MAI.The threshold seriously affects the acquisition performance. We compare the analysis results withthe Monte Carlo simulation results.

关 键 词：扩频通信 多址通信 

分 类 号：TN914.5[电子电信—通信与信息系统]