基于有限反馈的协作多小区分布式预编码  

Distributed precoding for coordinated multicell system based on limited feedback

作　　者：张瑞[1] 傅洪亮[1] 宋荣方[2,3] 

机构地区：[1]河南工业大学信息科学与工程学院,郑州450001 [2]南京邮电大学通信与信息工程学院,南京210003 [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》2013年第4期459-468,共10页Scientia Sinica(Informationis)

基　　金：国家自然科学基金(批准号:60972041;61001099;61271234);校高层次人才基金(批准号:2012BS056);河南省科技创新杰出青年基金(批准号:104100510008)资助项目

摘　　要：多小区协作需要基站间交换大量的信息.为了降低无线回传开销和反馈开销,采用基于信漏噪比最大化的分布式预编码方法,该方法仅需共享干扰信道的信道状态信息,不需要共享数据,与特征值波束成形和小区间干扰清零两种极端的方法相比取得了性能提高.其次,为了更加有效利用反馈资源,推导了速率损耗公式,利用穷尽搜索得到使其最小化的最优解,得出比特自适应分配规律.仿真表明,根据期望信号和干扰信号强度自适应的分配反馈比特能进一步提高系统速率.Multicell cooperation requires much information exchange between base stations. To reduce backhaul overhead and feedback overhead, a distributed precoding method based on signal-to-leakage-and-noise-ratio max- imization is proposed, which only needs the sharing of channel state information of interference channel and not the user data. It has a better performance compared with eigenbeaming and intercell interference nulling which are two extreme sides. To fully exploit feedback, we derive the expression of sum rate loss and find the optimal solution to minimize it by brute-force research. Simulation results show that the performance can be further improved through adaptively allocate bits relying on the relative strength between the desired and interfering signals within the cell.

关 键 词：信漏噪比 有限反馈 协作单小区传输 自适应比特分配 

分 类 号：TN929.5[电子电信—通信与信息系统]