A novel frequency domain equalizer for single carrier modulation is presented. It performs as a decision feedback equalizer (DFE) with the feedforward operating in the frequency domain, and a feedback filtering in time domain. The new scheme makes use of a data block transmission format, which can be seen as a generalization of the zero padded transmission. Performance comparisons between FD-DFE and orthogonal frequency division multiplexing (OFDM) show that FD-DFE yields a capacity very close to that of OFDM. Design methods of the FD-DFE are investigated and a reduced complexity technique is developed, with the result that FD-DFE and OFDM have a similar computational complexity in signal processing.
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