Mutual coupling compensation using subspace fitting

The effects of an unknown mutual coupling is compensated for by estimating the coupling along with the direction of arrival (DOA) using a modified version of the noise subspace fitting (NSF) algorithm. It is possible to concentrate the NSF criterion regarding time coupling parameters, and the DOAs are obtained by a numerical search just as in the coupling free case. To evaluate the proposed method, the mutual coupling in a uniform linear array (ULA) of dipoles is calculated using fundamental electromagnetics. It is found that the effects of an unknown coupling can be reduced by estimating the coupling as well as the DOAs.