Self-optimization null-extension control scheme for wireless communications

In this article, a self-optimization null-extension control (SONEC) scheme is proposed for canceling the co-channel interference and improving the signal-to-interference-plus-noise ratio (SINR) of the wireless communication systems. The proposed method automatically controls the number of nulls in the antenna pattern as per the changing environment based on adaptive-network based fuzzy interference system (ANFIS) to maintain output SINR level higher than or equal to the required threshold. Finally, simulation results show a performance superiority of the proposed SONEC compared with minimum mean square error (MMSE) based adaptive nulling control algorithm and conventional fixed null scheme.