Abstract:

A subband method with general-parameter-filter banks (GPFB) for wideband array adaptive beamforming is proposed. The received wideband signal is divided into multiple subband signals by the analytical filter bank. Each of the subband signals is then fed into its corresponding subband array processor, of which the outputs are combined by the synthesis filter and recovered into wideband signal. As subbands are running at down-sampling rate and in parallel manner, the loads of computational processing can be effectively alleviated, and the efficiency of array improved. The simulation results show that the convergence speed of weights and deep suppression of the interference are enhanced with the subband method except for a little worse mean square error (MSE) of the output signal. In addition, compared to the subband method using quadrature-mirror-filter (QMF) banks with the same number of channels, this method possesses a superior ability of interference suppression, and it is also capable of reducing the MSE significantly.

Key words: adaptive beamforming, general-parameter-filter banks, subband, wideband array antenna