抑制宏基站干扰的下行干扰协调方案

A Downlink Interference Coordination Algorithm to Suppress Interferences from Macro Base Station

在宏蜂窝和微微蜂窝联合覆盖的异构无线网络中,具有大发射功率的宏基站会给微微蜂窝用户造成较大的下行干扰,为此,提出一种波束零陷-用户选择算法,以抑制来自宏基站的下行干扰,从而达到改善系统频谱效率的目的.对微微蜂窝用户受到的干扰进行了数学建模和理论分析,并通过仿真评估了所提算法带来的性能增益,结果表明,新算法在高信噪比或微微蜂窝小区数目较大时的性能增益非常显著.

In heterogeneous networks where the Macro cell is overlaid by Pico cells,severe downlink interference is suffered by Pico users from the Macro base station of high transmission power. A beam nulling-user selection algorithm is proposed to suppress the interference from the Macro station and therefore enhance the system spectrum efficiency. The interference to Pico users is modeled and analyzed in a mathematical way. Simulation is performed to evaluate the enhancement of the proposed algorithm. It is shown that the performance is significantly improved in case of the high signal-to-noise ratio region or large number of Pico cells.