We propose a novel method for user-to-user interference (UUI) mitigation in dynamic time-division duplex multiple-input multiple-output communication systems with multi-antenna users. Specifically, we consider the downlink data transmission in the presence of UUI caused by a user that simultaneously transmits in uplink. Our method introduces an overhead for estimation of the user-to-user channels by transmitting pilots from the uplink user to the downlink users. Each downlink user obtains a channel estimate that is used to design a combining matrix for UUI mitigation. We analytically derive an achievable spectral efficiency for the downlink transmission in the presence of UUI with our mitigation technique. Through numerical simulations, we show that our method can significantly improve the spectral efficiency performance in cases of heavy UUI.

翻译：本文提出了一种用于抑制动态时分双工多输入多输出通信系统中多天线用户间干扰的新方法。具体而言，我们考虑在存在由同时进行上行链路传输的用户所引起的用户间干扰情况下的下行链路数据传输。该方法通过上行链路用户向下行链路用户发送导频信号，引入了用于估计用户间信道的开销。每个下行链路用户获得信道估计值，并据此设计用于抑制用户间干扰的合并矩阵。我们通过理论分析推导了在采用所提干扰抑制技术时，存在用户间干扰情况下下行链路传输可实现的频谱效率。数值仿真结果表明，在强用户间干扰场景下，该方法能显著提升频谱效率性能。