Improved Interference Cancellation Method for MIMO Interference Channel

Abstract

An improved interference cancellation method is proposed for MIMO interference channel with three users each of which equipped with four antennas.4×4 space-time codeword with Alamouti code structure is designed.The multi-user interference at the first receiver is cancellated by the unidirectional operational link.Then,the interfering codeword are aligned at the second and the third receivers through interference alignment pre-coding.Multi-user interference at these two receivers is cancellated by the orthogonal properity of the effective channel matrices for Alamouti code.Experimental result shows that the diversity gain of the proposed method is 8,higher than that of the existing interferenc acncellation method for the same scene.And it has higher system capacity and reliability.