The effect of additive noise on the channel state information (CSI) quality is a crucial issue in mobile communication systems. adaptive subcarrier grouping (ASG) for sample matrix inversion (SMI) based minimum mean square error (MMSE) array has been previously proposed. However, this method needs to know signal-to-noise ratio (SNR) advance set threshold, perform grouping, and take average, cau...

This thesis addresses the use of adaptive beamforming and imaging methods applied to active sonar. While adaptive beamformers are known to offer improved performance when applied to passive sonars, their use is limited in active sonar systems. In this thesis, we investigate the potential performance gains of using adaptive beamforming methods for a range of active sonar applications. Key challe...