Robust V-blast MIMO-OFDM channel estimators in time-varying channels using iterativewiener filters

A robust iterative pilot symbol aided modulation (PSAM) channel estimation (CE) approach is proposed for vertical Bell Laboratories layered space-time (V-BLAST) multiple-input multiple-output orthogonal frequency division multiplexing systems operating on time-varying wireless channels. Since the signals at receive antennas are the superposition of the transmitted signals from multiple transmit antennas in V-BLAST systems, accurate CE is crucial for good error rate performance. Furthermore, since the channel estimator is independently implemented for a MIMO system, the proposed iterative algorithm has an inherent iterative interference cancellation characteristic. Simulation results demonstrate excellent performance of the proposed algorithm on frequency selective fading channels