Generalized Precoder Design for MIMO Interference Channel Based on Interference Alignment

Recent research shows that K user time-varying interference channel is capable of achieving K/2 degrees of freedom based on the idea of interference alignment. In multiple-input-multiple-output (MIMO) interference channels, appropriate transmit precoder design plays a pivotal role in efficiently suppressing the co-channel interference. In this paper, we propose a generalized precoder design for MIMO interference channels with the aid of interference alignment. Specifically, we consider the precoder design for both symmetric system where each of the transmit and receive nodes is equipped with the same number of antennas, and asymmetric system where the number of antennas at transmit node exceeds its counterpart at receive node. As demonstrated by the simulation results, our proposed precoder design is capable of significantly improving the system sum capacity.