Normalized adaptive minimum bit-error-rate beamformers

We address the convergence limitations of adaptive minimum bit-error-rate beamformers (AMBER) beamformers under fading channel environments by developing the normalized AMBER (NAMBER) beamforming algorithms. NAMBER beamformers make use of probability-of-bit-error cost functions that are normalized vs. input signal level. The NAMBER beamformers include the normalized MBER (NMBER), normalized block-adaptive-MBER (NBAMBER), normalized least-bit-err or-rate (NLBER) and normalized approximate least-bit-error-rate (NALBER). Simulation results show that the NMBER can achieve lower BERs compared to MBER and maximum-signal-to-interference-plus noise ratio (MSINR) under a fading channel environment.