低扩频比CDMA系统中符号间干扰抵消的Viterbi均衡算法研究  

A novel ISI cancellation scheme using Viterbi equalization algorithm in low processing gain CDMA systems

作　　者：陈玉[1] 许昌龙[1] 赵春明[1] 尤肖虎[1] 

机构地区：[1]东南大学移动通信国家重点实验室,江苏南京210096

出　　处：《通信学报》2003年第2期71-77,共7页Journal on Communications

基　　金：国家杰出青年基金资助项目CNSF(69725001);江苏东南大学通信技术有限责任公司(SeuComm)基金资助项目

摘　　要：本文提出了一种低扩频比CDMA系统中Rake合并与软输出Viterbi均衡的联合算法以及相应的接收机结构。首先通过Rake接收得到符号序列,然后进行软输出Viterbi均衡,在计算复杂度增加不多的情况下,有效地克服蜂窝CDMA系统中传输高速数据业务时所存在的多径干扰和符号间干扰的影响,从而显著地提高CDMA接收机的性能。A joint receiving scheme of Rake combining and soft-output Viterbi equalization for low processing gain CDMA systems is proposed in this paper. The corresponding receiver structure is also described. Soft-output Viterbi algorithm (SOVA) is applied to symbol sequences after Rake combining to effectively eliminate the multi-path interference (MPI) and inter-symbol interference (ISI) during transmission of high rate data in cellular CDMA systems. So the performance of CDMA receiver is greatly improved.

关 键 词：CDMA 算法 RAKE接收机 Viterbi均衡 符号间干扰 低扩频比 第三代移动通信 

分 类 号：TN929.533[电子电信—通信与信息系统]