GSTBC SFH MC DS-CDMA系统中的组排序串行干扰消除算法  

The Group Ordered Successive Interference Cancellation for GSTBC SFH MC DS-CDMA Systems

作　　者：蔡凌云[1] 罗汉文[1] 宋文涛[1] 张海滨[1] 

机构地区：[1]上海交通大学电子工程系,上海200240

出　　处：《上海交通大学学报》2006年第5期747-751,757,共6页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(60272079;60332030);国家高技术研究发展计划(863)项目(2003AA123310)

摘　　要：提出一种新颖的分组空时分组码慢跳频多载波码分多址(GSTBC SFH MC DS-CDMA)系统结构,允许一定的用户采用相同的跳频图案,并将这些用户看成一个虚拟组,同时对该组中的用户通过分配不同的扩频码来分成多个子组.这样的结构增加了整个系统同时接入的用户数,提高了系统的频谱利用率.利用每个子组用户的后验组信噪比排序,依次进行组串行干扰消除的算法来消除不同子组用户之间的多址干扰.仿真结果表明,存在多址干扰的情况下,所提出的算法能够较好地提高系统性能,特别是在多用户干扰较严重的情况下,性能改善更加明显.This paper proposed a novel Group STBC SFH MC DS-CDMA configuration, which assigns some users with the same FH pattern. These users are taken as a virtual group. Furthermore, these users are divided into the different sub-groups with different spreading codes. Such a structure increases the simultaneous access users so as to improve the spectrum efficiency. The group order successive interference cancellation algorithm was proposed to mitigate interference for the different sub-groups and improve the system performance. This algorithm utilizes the post group signal-to-noise （PGSNR） of every sub-group and conducts the group successive interference cancellation according to the order of PGSNR. The simulation results show that the proposed algorithm can improve the system performance under multi-access interference, in particular under the severe multi-access interference.

关 键 词：空时分组码 慢跳频 码分多址 多用户检测 串行干扰消除 

分 类 号：TN911[电子电信—通信与信息系统]