OFDM Interference Mitigation Algorithms for Doubly-Selective Channels

Frequency division multiplexing (OFDM) system may suffer from significant Inter-carrier Interference (ICI) and Inter-block Interference (IBI) under a time- and frequency- selective (or doubly-selective) channel. We propose a novel hybrid architecture where a time-domain FIR filter mitigates IBI by shortening the channel to the cyclic prefix length. This is followed by ICI cancellation in the frequency-domain using few FIR taps per subchannel combined with successive cancellation. We also propose an iterative joint data and channel estimation scheme to improve the channel estimation performance.