Generalized sidelobe cancellers with leakage constraints

A class of linear constraints is proposed for generalized sidelobe cancellers (GSCs) in the presence of direction of arrival (DOA) mismatch. In order to alleviate the signal cancellation problem, the class of linear constraints for the adaptive canceller in a GSC, called leakage constraints, is derived, based on the estimation of blocking matrix leakages. With the leakage constraints, the modified GSC is robust against DOA mismatch. Compared with the well-known adaptive beamformer with derivative constraints, fewer constraints are required and the capability of interference and noise cancellation is improved. Computer simulations demonstrate the effectiveness of the proposed GSC with leakage constraints.