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为了对抗多小区分布式天线系统(distributed antenna system,DAS)中的小区间干扰,以较低复杂度实现较高的系统效率,该文研究了多小区DAS中基于慢变大尺度信道状态信息(channel state information,CSI)的协同发送天线选择问题。以最大化系统平均和容量为目标,提出了一种基于平均和容量上界的低复杂度协同发送天线选择方案。同时,为了探索所提方案与最优方案的性能差异,还提出了一种基于平均和容量精确近似闭式表达式的方案作为对照。仿真表明:基于大尺度CSI的协同发送天线选择可以有效控制小区间干扰,大幅提升系统容量。同时,所提的基于平均和容量上界的协同发送天线选择方案性能接近最优。
In order to counter the inter-cell interference in the distributed antenna system (DAS) and achieve high system efficiency with low complexity, this paper studies the multi-cell DAS based on slowly varying large-scale channel state information channel state information, CSI). In order to maximize system averaging and capacity, a scheme of low-complexity cooperative transmission antenna based on average and upper bound of capacity is proposed. At the same time, in order to explore the performance of the proposed program and the optimal solution, a scheme of accurately approximating the closed-form expression based on the average and the capacity is also proposed as a control. The simulation shows that the co-transmission antenna selection based on large-scale CSI can effectively control the inter-cell interference and greatly improve the system capacity. At the same time, the proposed cooperative transmission antenna selection scheme based on the average and the capacity upper bound performance is close to optimal.