When multiple input multiple output(MIMO)-orthogonal frequency division multiplexing(OFDM) systems operate in frequency-selective fast fading channels

the orthogonality among subcarriers will be violated

which brings about intercarrier interference(ICI).The existence of the ICI will significantly degrade the performances of the detectors dedicated to MIMO-OFDM systems in quasi-static fireqtrency-selective fading channels.In this paper

we extend the optimum linear preprocessing idea

which is proposed by Schniter for single input single output OFDM systems

to MIMO-OFDM systems.Based on the new signal model

we extend the minimum mean square error filtering based iterative soft decision interference cancellation(MMSE-ISDIC) symbol detector

and propose a quasi-maximum a posteriors probability based ISDIC(quasi-MAP-ISDIC) joint detector.Simulatiott results show that both detectors outperforms the detector proposed in [8] for the scenarios considered in this paper

and the quasi-MAP-ISDIC detector can obtain a performance close to that of the MAP detecwr with ideal ICI cancellation.