一种基于错误传播补偿的V-BLAST自适应比特和功率分配算法  

An Adaptive Bit and Power Allocation Algorithm for V-BLAST System Based on Error Propagation Compensation

作　　者：马俊[1] 周武扬[1] 朱近康[1] 

机构地区：[1]中国科学技术大学个人通信与扩频实验室,合肥230027

出　　处：《无线通信技术》2006年第4期13-18,共6页Wireless Communication Technology

基　　金：国家自然科学基金重大项目(60496314);国家863重大项目(2003AA123310)资助研究课题

摘　　要：本文探讨了V-BLAST系统在总发射功率受限和一定目标误码率要求的前提下,基于自适应调制时间块的比特、功率分配问题,分析和比较了系统在采用不同串行干扰抵消顺序时的抗信道时变性能和抗错误传播性能,找出了在BER和速率两方面性能最优的串行干扰抵消顺序。针对错误传播对系统BER性能的冲击,提出了一种新的基于错误传播补偿的V-BLAST自适应比特、功率分配方案。仿真结果表明,该方案能显著提高系统在时变信道下的BER性能,有效增大自适应调制块长度,减小反馈开销。Block-wise adaptive bit and power allocation in V-BLAST system with a target BER and a total transmit power constraint is discussed in this paper. We analyze the antitime-varying capability and anti-error-propagation capability of different kinds of SIC ordering, and find the SIC ordering scheme optimal both in BER performance and in rate performance. In order to reduce the impact of error propagation, a new bit and power allocation algorithm based on error propagation compensation is proposed in this paper. Simulation results show, the new algorithm can effectively improve the BER performance of block-wise adaptive V-BLAST system and decrease feedback overhead.

关 键 词：自适应调制 V—BLAST 串行干扰抵消(SIC) 

分 类 号：TN92[电子电信—通信与信息系统]