Sum rate of K-user MIMO interference channel for finite constellation inputs with interference alignment

In this paper, we discuss the information rate with finite constellation inputs for interference channels. In literature, the information rate related analysis for finite constellations has been presented in Ganesan et al. and Wu et al. By using this analysis, they have provided an algorithm to maximize the sum rates but the interference effect has not been considered. In this paper, we derive the same sumrate expressions in a simpler manner for finite constellations, and apply three popular interference alignment (IA) algorithms to compare the sumrates and symbol error rate (SER) performances. The simulation results show that for (2 × 2, 1)
³
system with BPSK and QPSK constellations, the max-SINR algorithm performs better in terms of sumrate and SER for finite constellation systems.