【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.更多还原

【Abstract】 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 maximization 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.更多还原