Abstract
In this letter, we propose a new frequency synchronization scheme based on space-time equalization for multi-user multi-input multi-output transmissions. We specifically consider the case where no cyclic-prefix is employed such that the spectral efficiency can be maintained. The subspace analysis is first carried out for the received space-time snapshots from both the training and a few unknown data symbols. The proposed method then performs joint carrier frequency offset (CFO) estimation and space-time equalization design for each user individually, with constraining the beamforming vector to lie in the corresponding signal subspace. Numerical results are provided to corroborate the proposed studies. We show that the proposed method can achieve much better CFO estimation as well as data detection performance as compared to the other conventional approaches.
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