Low-complexity robust adaptive wideband beamforming based on covariance matrix reconstruction

A novel beamformer without tapped delay lines (TDLs) or sensor delay lines (SDLs) is proposed. It treats one wideband signal from a direction as multiple narmwband signals from an angular sector. To preserve the signal of interest, it reconstructs the interference-plus-noise covariance matrix using narrowband Capon spectral estimator. Eliminating the TDLs and SDLs leads to a simpler system and lower computational complexity. Moreover, it outperforms traditional wideband beamforming methods in the case of limited snapshots or high signal-tonoise ratio.