MIMO-OFDM系统的自适应多用户分集及性能分析  

The Adaptive Multi-User Diversity and Performance Analysis Based on MIMO-OFDM System

作　　者：胡封晔[1] 王树勋[1] 孙晓颖[1] 郭纲[1] 

机构地区：[1]吉林大学通信工程学院,吉林长春120025

出　　处：《电子学报》2008年第7期1324-1328,共5页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60272065)

摘　　要：本文建立基于随机波束成形和自适应调制的MIMO-OFDM系统的自适应多用户分集系统模型,提出随机波束成形QR接收机的自适应多用户分集资源分配算法及其简化算法,推导在最大化系统吞吐量条件下系统的误码性能.仿真结果表明该算法在用户数很小时使系统性能收敛到特征波束成形系统的性能;当用户数增多时,采用天线分配算法的多用户分集系统能获得比特征波束成形系统更好的性能;将自适应编码调制技术运用到多用户分集系统来提高系统的实际吞吐量和误码性能.In this paper, an model of adaptive multi-user diversity based on random beamfomaing and adaptive modulation MIMO-OFDM system is established. An resource allocation algorithm and simplified algorithm of adaptive multi-user diversity combining random beam-former and linear QR receiver are proposed. The system BER performance is deduced when the system throughput is maximal. Simulation result shows that the algorithm can make the system performance approach that of eigen-beamforming system even the user number is small. Multi-user diversity with antenna allocation can achieve better performance than that of eigen-beamforming system. Finally, adaptive subchannel coded modulation is adopted to improve system throughput and BER performance further.

关 键 词：MIMO-OFDM 自适应调制 多用户分集 

分 类 号：TN929.5[电子电信—通信与信息系统]