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In this paper, the authors consider the problem of joint channel and frequency offset estimation, data detection in a flat-fading Multi-Input Multi-Output (MIMO) system. They assume that each pair of transmit and receive antennas has a different frequency offset value. They present a computationally efficient iterative algorithm based on the Space-Alternating Generalized Expectation-maximization (SAGE) and the Expectation Conditional Maximization (ECM) algorithms. Multi-antenna transmission over Multi-Input Multi-Output (MIMO) channels has been proved to be effective in combating multipath fading, as well as increasing the channel capacity.
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