在扇区天线环境下的子空间干扰对齐技术

摘要

最近一些研究表明,干扰对齐算法可以在高信噪比的情况下使干扰信道容量接近香农容量.干扰对齐的主要思想是将来自其他基站的干扰信号对齐到相同的信号子空间,而将有用信号放在完全没有干扰的信号子空间进行传输.本文考虑每个基站采用基于子空间干扰对齐的方法,在扇区天线环境下,来实现小区间的干扰对齐.在很多文献中,提到了小区间的协作方案,这样往往会引起协作簇之间的干扰,本文采用扇区天线,通过三小区进行协作,避免协作簇之间的干扰.仿真结果表明本文所提算法可以有效降低干扰,进一步提高中断容量和频谱效率.%A number of recent studies suggest that interference alignment approach the Shannon Capacity of interference networks at high SNR.The main idea of interference alignment is to align the interference from other BSs into the same channel space,while the local BS transmits own signal in the channel space free of interference.In this work,we consider subspace interference alignment with the use of tri-sector antenna.In many works,basestation cooperation is considerd to decrease interference,while it causes inter-cluster interference.We adopt tri-sector antenna to cooperate 3 BSs in order to avoid inter-cluster interference.Further,the results of simulation show that the proposed algorithm can greatly reduce interference,and improve both the outage capacity and spectrum efficiency.