Convex optimization based adaptive broadband FIR beamforming with sidelobe control

An approach to time-domain broadband beamforming with sidelobe control is proposed. The array response is expressed as a linear function of the finite impulse response (FIR) filters tap weights. The filters are designed by minimizing array output power while maintaining the distortionless response in the direction of the desired signal and guaranteeing the sidelobes to be below some given threshold values. Norm constraint on tap weights is also imposed to improve the robustness of the beamformer. Computationally efficient convex formulation for the beamformer design problem is derived using second-order cone programming (SOCP). Simulation results demonstrate the satisfactory performance of the proposed approach.