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为了减小多天线蜂窝通信系统中存在的小区间干扰,提出了基于加权信号泄漏比的多小区协作波束成型算法。该算法利用有用信号的均值对不同用户接收到的泄漏信号功率进行加权,之后各个小区独立设计并使用能够最大化加权信号泄漏比的波束。利用上下行信道的对偶性,得到了最优波束的闭式解。仿真结果表明:在不同的系统调度策略下,提出的基于加权信号泄漏比的多小区协作波束成型算法都可以在不影响用户公平性的基础上提高系统平均吞吐率,同时保持较低的实现复杂度。
In order to reduce the inter-cell interference existing in the multi-antenna cellular communication system, a multi-cell cooperative beamforming algorithm based on the weighted signal leakage ratio is proposed. The algorithm uses the mean of the useful signal to weight the leakage signal power received by different users. Afterwards, each cell independently designs and uses the beam which can maximize the weighted signal leakage ratio. By using the duality of the uplink and downlink channels, the closed-form solution of the optimal beam is obtained. The simulation results show that under different system scheduling strategies, the multi-cell cooperative beamforming algorithm based on the weighted signal leakage ratio can improve the average throughput of the system without affecting the fairness of users while maintaining the low implementation complexity degree.