多用户MIMO下行收发联合波束成形  

Joint beamforming for multiuser downlink MIMO transmission

作　　者：赵金旺[1] 徐友云[1] 蔡跃明 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《电路与系统学报》2010年第5期64-70,共7页Journal of Circuits and Systems

基　　金：江苏省自然科学基金(BK2006701);国家自然科学基金(60672079);国家"863"课题(2009AA1Z249)

摘　　要：针对随机波束成形(RBF)只有在包含大量用户的系统中才能获得较好性能的局限性,提出了一种新的收发联合波束成形方案,用于多用户多入多出(MIMO)下行链路传输。该方案有效地结合了RBF与接收天线合并技术。分析及仿真结果表明,即使在用户数为中等甚至较小时仍然能获得较高的和速率性能。由于每个用户的反馈开销没变,从而使获得同样和速率时系统的总反馈开销明显减少。仿真结果还显示,所提方案的和速率性能不仅优于原RBF,也比RBF结合最大比合并或者等增益合并的性能有明显改善,同时还保持了最优的随用户数变化的增长速度。Considering the limitation of the traditional random beamforming（RBF）, which a scheme achieves high sum rate capacity only under the condition of large number of users, we propose a new joint beamforming scheme for multiuser downlink MIMO transmissions. The propose scheme effectively combines RBF with the receiver antenna diversity. Analysis and simulation results show that it can achieve high sum rate capacity even if the system with a moderate or fewer number of users. Since the channel information feedback for each user is kept as the same as RBF, the total feedback load of the system is greatly degraded. Simulation results also show that performance of the proposed scheme is better than RBF, it also outperforms the schemes that RBF combines with MRC or EGC antenna diversity. This scheme keeps an optimal sum rate scaling with the number increasing of users.

关 键 词：多入多出 多用户分集 空间复用 随机波束成形 天线合并 

分 类 号：TN929.5[电子电信—通信与信息系统]