Abstract
An optimum receiver for multiple-input multiple output orthogonal frequency-division multiplexing (MIMO-OFDM) communication systems accounting for realistic channel estimation is proposed. The receiver is assumed to comply with the emerging IEEE 802.11n standard and its performance is compared against that of a <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">genie</i> receiver (corresponding to ideal channel estimation) and a <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">mismatched</i> receiver (using estimated channel state information in the ideal channel metric). Receiver complexity is addressed in two steps: first, by developing an iterative expression of the receiver metric and second by implementing a spectral approximation, which allows a dramatic reduction of the receiver complexity with unnoticeable degradation. Since the <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">optimum</i> receiver is based on the availability of channel distribution information, it is shown by numerical results that its estimation has a marginal effect on the error performance and does not represent an issue for the receiver implementation.
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