Low-complexity detection of OFDM in doubly-dispersive channels

When OFDM systems with large block length are used in fast-fading multipath channels, the channel may induce significant intercarrier interference (ICI). As a result, the standard ML, MMSE and ZF detectors become prohibitively complex. In response, we propose a computationally-efficient decision-feedback detection strategy based on optimal windowing and linear MMSE estimation. Simulation results indicate good performance relative to the standard MMSE detector but with significant computational savings.