有限反馈下的协作多点传输可达速率分析  

Achievable rates of coordinated multi-point transmission under limited feedback

作　　者：杨一凡[1] 芮赟[2] 李明齐[2] 盛彬[3] 宋荣方[1] 

机构地区：[1]南京邮电大学通信与信息工程学院,南京210003 [2]中国科学院上海高等研究院,上海201210 [3]东南大学移动通信国家重点实验室,南京210096

出　　处：《中国科学：信息科学》2012年第10期1303-1314,共12页Scientia Sinica(Informationis)

基　　金：国家高技术研究发展计划(批准号:2011AA01A105);上海市科委项目(批准号:10DZ1500700;11DZ1500500);国家自然科学基金(批准号:60972041;61271234);中科院重点部署(批准号:KGZD-EW-103-3)资助项目

摘　　要：本文研究了LTE-A(LTE-Advanced)系统中非理想信道状态信息(channel state information,CSI)条件下的协作多点(coordinated multi-point,CoMP)传输机制.针对有限反馈产生的量化误差,分析了联合处理(joint processing,JP)及协作波束成形(coordinated beamforming,CBF)两种模式下的系统可达速率,并推导出其闭合表达式.对于联合处理,先由量化误差的概率分布推导出系统容量,随后提出了平均值替代和分布等价两种近似算法;对于协作波束成形,通过分析有用信号和干扰信号的分布,最终得到系统可达速率.同时为了获得较高的系统总速率,根据信噪比和量化精度等判决依据,采用了协作模式动态切换机制.In recent years, multicell-processing （MCP） is proposed as a more efficient way to suppress inter-cell interference （ICI） through coordination among multiple base stations （BSs）. For advanced E-UTRA, increasing the system and cell edge throughput by using coordinated multi-point （CoMP） transmission is of particular interest. Moreover, in practical situations, channel state information （CSI） is required at each BS to make the scheduling decisions, however, it is difficult to get and is never perfect. Hence, it is more desirable to analyze the achievable rates of different coordinate multi-point （CoMP） modes under imperfect CSI to promote the insight of the new technology. This paper studies the coordinated multi-point transmission under imperfect channel state information in LTE-Advanced systems. The achievable rates are derived for both joint processing （JP） and coordinated beamforming （CBF） modes considering the limited feedback errors. Especially for the JP mode, the

关 键 词：反馈 协作多点 联合处理 协作波束成形 吞吐量 无线通信系统 

分 类 号：TN929.5[电子电信—通信与信息系统]