DOA estimation for noncircular signals in the presence of mutual coupling

This communication considers the problem of direction-of-arrival (DOA) estimation for multiple uncorrelated noncircular signals in the presence of mutual coupling. A method is proposed to eliminate the effect of mutual coupling for uniform linear arrays (ULAs). By taking advantage of the special structure of the mutual coupling matrix, the mutual coupling free covariance matrix and elliptic covariance matrix, the mutual coupling coefficients can be estimated using an iterative algorithm. The estimated mutual coupling coefficients can be embedded within any DOA estimation algorithm for circular signals or noncircular signals. Simulation results demonstrate the effectiveness of the proposed method.