Two-mode adaptive beamformer using a systolic array

An adaptive beamformer using the least squares algorithm usually employs exponential windowing of the input data. The authors show that complete suppression of interferences is impossible when an exponential window is applied. To avoid this, a two-mode operation using a systolic array is proposed. Switching is made from an adaptive mode to a frozen mode when the system converges and vice versa when the radio environment changes, by monitoring the change in the magnitude of one of the weights. The proposed method gives exact extraction of the desired signal and is capable of fast suppression of new interferences