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Orthogonal Frequency Division Multiplexing (OFDM) has emerged as a modulation scheme that can achieve high data rates over frequency selective fading channel by efficiently handling multipath effects. This paper proposes receiver design for space-time block coded MIMO OFDM transmission over frequency selective time-variant channels. Joint channel and data recovery are performed at the receiver by utilizing the Expectation-Maximization (EM) algorithm. It makes collective use of the data constraints (Pilots, cyclic prefix, the finite alphabet constraint, and space-time block coding) and channel constraints (Finite delay spread, frequency and time correlation, and transmit and receive correlation) to implement an effective receiver.
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