消除多基站时变信道异步干扰的块对角化算法

摘要

由于信道状态信息的时变特性和信道反馈误差的共同影响,使得以前波束成形算法无法完全消除小区间的干扰,特别是异步干扰,从而造成小区边缘用户传输速率和服务质量的下降.针对此问题,通过对信道时变特性的研究和反馈误差统计特性的研究,提出了一种考虑信道时变统计特性的基于块对角化的波束成形方案,此方案在基站端对所发送的信号进行编码,对将要造成的异步干扰进行预消除,从而达到提高小区边缘用户服务质量的效果.仿真结果表明,此方案有效抑制了由信道时变引起的干扰,提高了系统的容量.%Due to the combined impact of combined impact of time-varying characteristics of channel state information and channel feedback error,beamforming algorithm can't completely eliminate the interference between cells,in particular,asynchronous interference,resulting in decline of cell edge user's transmission rate and the service quality.Aiming at this problem,through studying the channel time-varying characteristics and statistical characteristics of the feedback error,this article put forward a kind of beamforming scheme which considers the statistical characteristics of time varying channel,and is based on block diagonalization.This scheme on the base station side sends the signal coding to eliminate the asynchronous interference so as to improve the cell edge user service quality.The simulation results show that this scheme effectively restrains the disturbance caused by the time-varying channel,improves the capacity of the system.