Ordered Precoder Designs for MIMO Interference Channels 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 interference alignment (IA). 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 two heuristic ordered precoder design algorithms for MIMO interference channels based on global search and chordal distance, respectively. Simulation results are provided to demonstrate that the proposed ordered precoder designs are capable of significantly improving the system sum capacity.