多步迭代MUD技术在TD-SCDMA系统中的应用  

Multi-Step Iterative MUD Technology for TD-SCDMA System

作　　者：杨丰瑞[1] 于秀兰[1] 

机构地区：[1]重庆邮电学院,重庆400065

出　　处：《重庆大学学报（自然科学版）》2005年第9期74-78,共5页Journal of Chongqing University

基　　金：国家高技术研究发展计划(2004AA123150)

摘　　要：联合检测(JD)技术是TD-SCDMA系统中的关键技术,但是满码道工作时,信噪比恶化将导致系统性能降低.多步联合检测(MSJD)技术和迭代多用户检测(MUD)技术可以解决这个问题.采用迭代MUD技术时,经过3次迭代后,将接近单用户的性能,但运算量与码道数呈指数关系.采用MSJD时,当码道数较大时,运算量相对于迭代MUD少得多,但是K个码道的系统性能最好只能接近采用JD算法时K/2个码道的性能.同时考虑运算量和系统性能,将迭代MUD和MSJD技术结合起来,提出了多步迭代MUD技术.根据仿真得出:相对于单纯的迭代MUD,运算量将大大减少;相对于单纯的MSJD,系统性能将大大提高.Joint Detection technology is a hot point in the research of TD-SCDMA system. Because of a SNR degradation, JD can not reach the need of system performance when system loads is close to the spread factor. MSJD and iterative multi-user detection are put forth to overcome the problem. When iterative MUD is adopted, the research shows that system performance is close to single user performance after 3 iterations, but its computational complexity grows exponentially with the number of code channel. When MSJD is adopted, complexity is reduced compared with iterative MUD, but system performance of code channels numbered K is only close to system performance of code channels numbered K/2 as JD is used. Considering computational complexity and system performance, multi-step iterative multi-user detection technology is brought forth based on iterative MUD and MSJD. According to simulation, the result can be concluded that complexity is reduced compared with single iterative MUD and system performance is improved compared with single MSJD.

关 键 词：TD—SCDMA系统 多用户检测 联合检测 迭代多用户检测 多步联合检测 多步迭代MUD 

分 类 号：TN929.53[电子电信—通信与信息系统]