DOA Estimation for Mixed Signals in the Presence of Mutual Coupling

In this paper, a new direction of arrival (DOA) estimation method is proposed in the presence of unknown mutual coupling. The impinging signals are a mixture of signals in different correlation degrees, which are uncorrelated, partially correlated or coherent with each other. The method proceeds in three steps. The noncoherent (uncorrelated or partially correlated) signals are firstly estimated with unknown mutual coupling. Then these estimates are utilized to get the mutual coupling coefficients. Finally, by eliminating the contributions of the noncoherent signals and compensating the mutual coupling effect, only coherent signals remain to be estimated. This method is simple but effective and does not need iterative processing. Simulation results demonstrate the effectiveness and performance of the proposed method.