Interference Alignment Close-form Solutions for Multiple-input Multiple-output Multiple-antenna Systems

Interference alignment can effectively increase channel capacity, but it is complicated to get the interference alignment solution of multiple-antenna system. Two set of close-form interference alignment solutions are studied in this paper for multiple-input multiple-output asymmetric systems. The users can use different number of receiving and transmitting antennas to get different degrees of freedom in those systems, which adapt to most of requirements in actual scene. The presented close-form solutions can solve interference alignment problems efficiently with the least number of total antennas.