时分复接码分多址系统中预瑞克与空时编码技术  

Pre-RAKE Combining with Space-Time Coding for TDD/CDMA Systems

作　　者：程健[1] 程时昕[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》2001年第2期44-49,共6页Journal of Circuits and Systems

摘　　要：提出了一种适用于时分复接码分多址系统的发射分集，即预瑞克与空时格状编码调制相结合方案。采用预瑞克代替瑞克，在接收机中采用单径瑞克就可实现多径分集,可以简化接收机结构和节约费用。计算机仿真结果表明，在多径衰落下，所提出方案的性能比仅采用空时码好。在最小均方误差意义下预瑞克抽头数应与多径数相同。所提出新型星座图－8APK（振幅相位键控）可以用来构造了一个空时码，此空时码性能比由8PSK构造的具有相同结构的空时码好。A novel synthetically transmit diversity, Pre-rake joint with space-time trellis coded modulation (STTCM), for TDD DS-CDMA system is proposed. Space-time code (STC) is applied for the multi-path fading circumstance. Pre-rake is used in stead of Rake to overcome multi-path fading for the simplicity of the receiver configuration. Through computer simulation, the performance of our proposed scheme in multi-path fading is better than that of STC only, the taps of the Pre-rake should be chosen to be equal to the multi-path number in the sense of minimum mean square error. A new constellation--8APK is presented to construct a kind of STC that achieves better performance than that of 8PSK.

关 键 词：预瑞克 空时码 发射分集 多径衰落 时分复接码发多址系统 

分 类 号：TN914.5[电子电信—通信与信息系统] TN911.22[电子电信—信息与通信工程]