Blind OFDM Receiver Based on Independent Component Analysis for Multiple-Input Multiple-Output Systems

We propose a novel blind orthogonal frequency division multiplexing (OFDM) receiver structure for multiple- input multiple-output (MIMO) systems based on independent component analysis (ICA), which increases the spectral efficiency effectively compared to training based systems, and provides considerable performance enhancement over previous ICA based methods. To further improve the performance, we also incorporate ICA with iterative layered space-time equalization (LSTE), which provides performance close to the case with perfect channel state information (CSI). The reduced-complexity versions of the two proposed structures, which use channel interpolation, result in similar performance at a substantially lower computational cost. Our receiver structures also have significantly better performance and lower complexity than a previously proposed subspace method when a large number of subcarriers are employed.