On AoA Estimation in the Presence of Mutual Coupling: Algorithms and Performance Analysis

This paper presents two novel methods for Angle-of-Arrival (AoA) estimation in the presence of unknown mutual coupling. We mainly focus on the first method, where we show that this method could estimate AoAs of multiple sources when more mutual coupling parameters are included in the model, compared to existing methods. Furthermore, we derive a closed form Mean-Squared-Error (MSE) expression of the proposed method and compare it to the MSE of MUSIC with known coupling parameters. In addition, the derived MSE expression is also compared to the Cramér-Rao bound of joint AoA and mutual coupling estimation in the asymptotic regime, i.e. at high signal-to-Noise ratio or large number of antennas. The second method serves as a refinement of the first one. Simulation results have demonstrated the potential of the proposed methods as they enjoy better performance than existing methods. A better description of the paper could be found in the Conclusions section.