X信道中一种改进的干扰消除方法

Improved Interference Cancellation Method over X Channel

对于每个用户配置4根天线的X信道,提出了一种改进的干扰消除方法。每个用户采用速率为2的空时分组码,通过在每个用户的发送信号中引入零元素,消除了接收端的非期望接收码字;通过对空时码字进行预编码使得每个接收端的期望接收码字正交传输,从而消除了期望接收码字间的干扰。与相同场景中的已有方案相比,所提方案在保持相同传输效率的同时,极大地减少了反馈量。仿真结果验证了所提方案的有效性。

An interference cancellation method based on space-time code was proposed for X channel with four antennas at each user. Each user employs rate-2 space-time block code. The unwanted codewords are eliminated through the introduction of zero elements at each user＇ transmit signals. The wanted codewords from two users keep orthogonal through the pre-coding for each codeword, so the interference between wanted codewords is cancelled. Compared with the existing scheme for the same scene, our proposed scheme greatly reduces feedback amount, while keeping the same transmission efficiency. Simulation results demonstrate the validity of the proposed scheme.