This paper presents a decision-directed (DD) maximum a posteriori probability (MAP) channel-estimation scheme for multiple-input multiple-output (MIMO) time-varying fading channels. With the estimate of the channel matrix for the current symbol interval, a zero-forcing (ZF) receiver is applied to detect the spatially multiplexed data on a symbol-by-symbol basis. Symbol decisions are then fed to the channel predictor for estimation of channel coefficients in future symbol intervals. Simulated

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... or performance of a ZF receiver with the DD MAP and perfect channel estimates is provided and compared. Index Terms-Decision feedback, MAP channel estimation, multiple-input multiple-output (MIMO) systems, time-varying fading.