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 inter-carrier 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.