干扰对齐是一种重要的干扰管理手段,与传统方法相比可以获得更大的信道复用增益。目前,多用户信道的干扰对齐实际实现大多为基于符号扩展的部分干扰对齐。与完全干扰对齐相比,部分干扰对齐存在较大的自由度损失。该文研究了4发2收用户MIMO X信道的完全干扰对齐问题。研究结果表明:对于4×2用户的MIMO X信道,当每个发射机3n天线,每个接收机6n天线时,完全干扰对齐可以获得8n的自由度。该方案实现简单,仅仅需要线性预编码和线性滤波。 Interference alignment is an important means of interference management, and can achieve greater channel reuse gain than the traditional method. At present, the actual implementation of interference alignment of multi-user channels is mostly based on the partially extended interference alignment. Partial interference alignment has a greater loss of freedom than complete interference alignment. This paper studies the complete interference alignment of 4 channels and 2 channels of user MIMO X channel. The results show that for a 4 × 2 MIMO channel, the complete interference alignment achieves 8n degrees of freedom for each transmitter 3n antenna and each receiver 6n antenna. The scheme is easy to implement and only needs linear precoding and linear filtering.