A Review on Interference Alignment in Multiuser Interference Channels

Abstract

As the density of base stations in wireless networks becomes higher, system performance is limited not by noise but by interference from other transmitters and so research on interference channels has been actively undertaken. In this article, we study interference alignment (IA) techniques, which are known to maximize the achievable degrees of freedom (DoF) under multiuser interference channels. First, the concepts and history of IA are introduced, and the results on achievable DoF are explained. From a practical aspect, beam design for multiple input multiple output interference channels is revisited. Additionally, channel information feedback, performance with feedback delay, blind techniques, cellular interference alignment and other recent results are explained. Based on these results, the feasibility and role of interference alignment are examined under various conditions.