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The InterCarrier Interference (ICI) resulted from fast fading channel destroys the orthogonality of the Orthogonal Frequency-Division Multiplexing (OFDM) signal and deteriorates receiver performance. In this paper, the authors propose two-stage interference canceller, which combines Zero-Forcing (ZF) equalizer with complex sphere decoder in a group-based version, to tackle the severe ICI on the OFDM. The algorithm is developed in accordance with the sparsity of ICI matrix, in which the channel power of subcarrier of interest primarily leaks to its neighboring subcarriers.
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