CDMA2000 1xEV-DO前向链路符号级迭代多用户检测器  

A symbol-level iterative multiuser detector for the forward link of CDMA2000 1xEV-DO

作　　者：王家恒[1] 赵春明[1] 蒋琦[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：《电路与系统学报》2006年第5期136-142,共7页Journal of Circuits and Systems

摘　　要：1xEV-DO[1]是CDMA2000 1x针对数据业务的增强系统。为提高数据传输速率,其前向链路用16个并行的码道传输调制符号,各码道由正交码-Walsh码隔离。但是这种正交性却被多径衰落信道破坏,产生了多码道干扰[2],严重影响了系统在高速传输数据时的性能。本文在1xEV-DO前向链路中引入了一种符号级迭代多用户检测器,用于消除多码道干扰。仿真结果表明,符号级迭代多用户检测器的性能好于Rake接收机和码片级均衡器,能够较好地解决系统在多径衰落信道中高速数据传输的问题。1xEV-DO is a data-enhanced system of CDMA2000 1x. In order to increase data transmission rate, the modulated symbols in the forward link are transmitted through 16 parallel code-channels, which are separated by orthogonal codes-Walsh codes. The orthogonality, however, is impaired by multipath fading channels, thus causing multicode interference （MCI） and deteriorating the system＇s performance at high data transmission rates. In this paper, a symbol-level iterative multiuser detector （MUD） is introduced into the forward link of 1xEV-DO to eliminate the MCI. The simulation results show that the performance of the symbol-level iterative MUD is superior to that of the Rake receiver as well as the chip-level equalizer, and hence indicate that the symbol-level iterative MUD is a comparatively good solution to the problem of high-rate data transmission of the forward link of 1xEV-DO.

关 键 词：多码道干扰 迭代多用户检测 干扰抵消 

分 类 号：TN929.533[电子电信—通信与信息系统]