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In doubly-selective fading wireless channel,the conventional orthogonal frequency division multi-plexing(OFDM)receivers for inter-carrier interference(ICI)compensation require extensive computa-tions.To obtain an effective balance between performance and complexity,the whole channel responsematrix was decomposed into a sequence of submatrix,and then a novel equalizer based on minimum meansquare error(MMSE)criterion was presented to combat the ICI.Furthermore,a simple ordering-baseddecision-feedback equalizer(DFE)was derived to exploit the temperal diversity gain offered by mobilechannels.Numerical studies illustrate that although the MMSE equalizer still suffers from error floor,whereas the DFE equalizer exhibits significant performance improvement.The advantage of the proposedscheme indicates its potential applications in the future broadband wireless systems.
In doubly-selective fading wireless channel, the conventional orthogonal frequency division multi-plexing (OFDM) receivers for inter-carrier interference (ICI) compensation require extensive computa-tions. To obtain an effective balance between performance and complexity, the whole channel response matrix was decomposed into a sequence of submatrix, and then a novel equalizer based on minimum means square error (MMSE) criterion was presented to combat the ICI. Stillrther, a simple ordering-based decision-feedback equalizer (DFE) was derived to exploit the temperal diversity gain offered by mobilechannels.Numerical studies illustrate that although the MMSE equalizer still suffers from error floor, while the DFE equalizer exhibits significant performance improvement. The advantage of the proposedscheme indicates its potential applications in the future broadband wireless systems.