多径衰落信道下MC-DS-CDMA系统性能分析  

Performance analysis of MC-DS-CDMA system on multipath fading

作　　者：胡茂凯[1] 陈西宏[1] 张群[2] 

机构地区：[1]空军工程大学防空反导学院,陕西西安710051 [2]空军工程大学信息与导航学院,陕西西安710077

出　　处：《华中科技大学学报（自然科学版）》2013年第1期97-101,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60971100)

摘　　要：研究多径衰落信道下的MC-DS-CDMA系统性能,子载波采用RAKE和最大比合并(MRC)接收方式.分析与计算了接收信号中有用信号和各干扰分量的数学统计特性,并在此基础上推导了系统的误比特率(BER)公式.仿真中考虑了系统用户数量、信道衰落指数以及延时功率谱衰减系数等参数对系统BER的影响.对系统性能进行了仿真验证,结果表明:给出的结果具有通用性,改变信道衰落指数和功率延迟谱衰落系数,可得到不同衰落信道类型下的系统BER;用户数目和信道衰落指数对系统BER影响大,而多径功率衰落系数对其影响较小.Multicarrier direct-sequence code-division-multiple-access（MC-DS-CDMA）system performance was evaluated on multipath channel.Rake receiver and maximal-ratio combination（MRC）were used for each subcarrier.The statistics of the useful components and interference of the received signal were calculated and bit error rate（BER）expression was achieved.Simulations were carried out to examine the BER performances considering of number of users,the parameter of fading amplitude and fading coefficient of the multipath intensity profile.Results show that the achieved BER expression is universal.BER on various multipath channels can be obtained by changing channel parameters.Results also show that BER changes remarkably with the number of users and the parameter of fading amplitude but slightly with the fading coefficients of the multipath intensity profile.

关 键 词：多载波直接扩频 多径衰落信道 NAKAGAMI衰落 性能分析 仿真 

分 类 号：TN911.6[电子电信—通信与信息系统]