Relaxed zero-forcing beamformer under temporally-correlated interference

• Temporal correlation between the desired and interfering signals is considered. Relaxed zero-forcing (RZF) beamformer uses an ellipsoidal constraint. Ellipsoidal constraint bounds interference leakage at output of beamformer. Analytic expression MSE RZF presented for two-user case. Efficacy brain activity reconstruction with EEG shown by simulations. The relaxed a quadratically-and-linearly constrained minimum variance central question addressed in this paper whether performs better than widely-used distortionless response beamformers under temporally-correlated interference. First, rederived imposing that amount mitigating intrinsic gap mean squared error (MSE) which stems from temporal correlations. Second, analysis single-interference case, showing how affected spatio-temporal correlations sources as well signal noise powers. Third, numerical studies are multiple-interference remarkable advantages its basic performance application to data. analytical experimental results clarify gives near-optimal some situations.