Adaptive minimum bit error rate beamforming assisted QPSK receiver

A novel adaptive beamforming technique is proposed for wireless communication with quadrature phase shift keying signalling based on the minimum bit error rate (MBER) criterion. It is shown that the MBER approach provides significant performance gain in terms of smaller bit error rate over the standard minimum mean square error approach. Using the classical Parzen window estimate of probability density function, both the block-data and sample-by-sample adaptive implementations of the MBER solution are developed.