Adaptive circular beamforming using multi-beam structure

In this paper, a broadband beamspace adaptive microphone array that constructs a multibeam network is proposed. A beampattern synthesis method that has its frequency invariant property focusing on the desired direction only was used to form the beams. The main idea is to replace the blocking matrix and the quiescent vector in the conventional General Sidelobe Canceler (GSC) with the frequency invariant beam-pattern synthesis method. Simulation results show that this proposed method has faster convergence rate than an existing algorithm.