多基站协作系统中有限反馈策略及其码本设计  

Limited Feedback Strategies and Codebook Design in Coordinated Multiple Base-stations Transmission Systems

作　　者：肖尚辉[1,2] 张忠培[1] 史治平[1,3] 

机构地区：[1]电子科技大学通信抗干扰国家重点实验室,成都611731 [2]宜宾学院物理与电子工程学院,宜宾644007 [3]东南大学移动通信国家重点实验室,南京211189

出　　处：《电子与信息学报》2010年第12期2954-2958,共5页Journal of Electronics & Information Technology

基　　金：国家973计划项目(2007CB310604);国家863计划项目(2009AA01Z234);东南大学移动通信国家重点实验室开放基金(W200818)资助课题

摘　　要：该文针对基于中央控制单元和大容量光纤骨干网连接而成的多基站集中调度协作系统所引起的高系统复杂度和高实现成本等问题,分析了一种可由现存蜂窝无线系统平滑过渡的多基站分布式协作MIMO系统结构及其信号传输特性。在此基础上,给出了该系统结构中基于信道量化码字索引信息的低速率有限反馈策略,讨论了对应的码本设计与构造准则,并提出了一种基于弦距离矢量量化准则的量化码本空间构造与实现算法。通过性能分析表明,该有限反馈策略获得的系统性能可明显优于模拟的导频重传方法,同时也好于基于欧几里德距离量化准则构造的码本空间性能。To overcoming some drawbacks for the existing multiple base-stations cooperative systems in which a central control unit and low-latency backhaul links are necessary in order to gather channel state information, a new framework and its signaling properties are discussed that allow cooperative communication on downlink links without the need of substantial modification on the conventional cellular systems. Furthermore, limited rate feedback strategies based on the index of the chosen code are explicitly analyzed, and then codebook design criteria and construction algorithm by adopting the chordal distance are presented. Some results show that the proposed scheme with relatively small feedback overhead improves the system performance significantly, compared to the conventional analog method and the Euclidean distance based quantization method.

关 键 词：无线通信 多输入多输出系统 协作通信 有限反馈 码本构造 

分 类 号：TN929.5[电子电信—通信与信息系统]