准同步CDMA系统的性能仿真研究  

Performance simulation of quasi-synchronous CDMA systems

作　　者：杨柳[1] 李翠然[2] 

机构地区：[1]深圳职业技术学院电子与信息工程学院,广东深圳518055 [2]兰州交通大学电子与信息工程学院,甘肃兰州730070

出　　处：《兰州理工大学学报》2009年第3期103-106,共4页Journal of Lanzhou University of Technology

摘　　要：准同步CDMA系统不要求系统严格同步,但限制了用户的接入时延误差.通过计算机仿真准同步CDMA系统在AWGN信道下的误码率性能:一方面考虑不同的接入时延误差对系统性能的影响;另一方面考虑不同的失步用户数对性能的影响.仿真结果表明,当接入时延误差较小且失步用户数在可容忍的范围内时,准同步CDMA系统的性能将远远优于异步CDMA系统,而接近同步CDMA系统.通过仿真曲线还可以看出,不同的接入时延误差条件下,准同步CDMA系统可以容忍的最大失步用户数目.Although strict synchronization is not required by the quasi-synchronous CDMA, but it restricts the time delay error as users get access to the system. Thus the performance of code error rate in a quasi-synchronous CDMA （QS-CDMA） system operated on AWGN channel was simulated on the computer, where the influence of the delay error of different accesses on the system performance as well as that of the numbers of different asynchronous users on the system performance were taken into consideration. The simulation result showed that QS-CDMA system would exhibit much more superior performance than the asynchronous system and would approximate to S-CDMA when the access delay error was smaller and the numbers of asynchronous users were tolerable. It could be found also that the maximum tolerable of number asynchronous users for different access delay error could be determined by checking the simulation curves.

关 键 词：准同步CDMA 无线通信 码分多址 同步 

分 类 号：TN914.53[电子电信—通信与信息系统]