CDMA系统中MAP迭代多码检测技术的研究  

Iterative MAP Multi-Code Detection for CDMA System

作　　者：董江波[1] 王刚[1] 李道本[1] 

机构地区：[1]北京邮电大学信息工程学院,北京100876

出　　处：《北京邮电大学学报》2004年第6期59-63,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(69931050)

摘　　要：给出了多径衰落信道下一种与前向纠错码相结合的迭代多码检测接收机,它基于最大后验概率准则联合检测多个码字所承载的信息,并与FEC(前向纠错编码)译码器相互传递软信息,重复多次进行迭代检测.在QPSK(四相频移键控)调制方式下通过LAS-CDMA(大区制同步码分多址)系统的仿真,表明所提出的迭代多码检测接收机即使在高维调制方式下依然可以获得显著的迭代增益,并且在迭代一定次数之后可以达到单码传输的性能.The iterative multi-code detection for LAS-CDMA (large area synchronization-code division multi-access) system based on MAP (maximum posterior probability) criterion is studied in this paper. It interchanges the soft information between multi-code detection and channel decoder each other for several times. The iterative detector for non-binary modulation in multi-path fading channel is proposed and the simulation results indicate that the proposed detector can even achieve single-code transmission performance when the iteration times is higher than 3 for QPSK (quadri phase shift key) modulation.

关 键 词：迭代多码检测 软信息 迭代增益 单码传输 

分 类 号：TN911[电子电信—通信与信息系统]