Adaptive Interference Suppression in MIMO Multiple Access Channels Based on Dual-Domain Approach

In this paper, the problem of adaptive filter design for interference suppression in multiple-input multiple-output (MIMO) multiple access (MAC) channels is considered. A new receiver filter is proposed by formulating the problem as quadratic minimization under double constraints: One is the widely-used distortionless constraint and the other is an additional constraint that bounds the energy of interfering signals remaining in the filter output. An efficient adaptive algorithm based on the dual-domain approach is presented to implement the proposed receiver filter. The proposed adaptive algorithm effectively incorporates side information into filter update, and yields better performance than existing adaptive algorithms. The simulation results show the efficacy of the proposed adaptive algorithm.