In this paper, carrier frequency offsets (CFOs) are considered in a layered frequency-domain equalization (LFDE) architecture for a single carrier (SC) broadband wireless multiple-input multiple-output (MIMO) system. At each layer of detection, a group of best data streams are selected to be equalized and reliably detected via removing the phase and amplitude distortion caused by the multiple CFOs. The estimated phase rotations and amplitude scalers are required to be compensated to the detected data streams in order to reconstruct the interference signals which are canceled out from the received signals. Instead of direct estimation of CFOs, our algorithm is to estimate the phase rotations and amplitude scalars in a group-wise fashion, which dramatically reduces the computational complexity at receiver. Simulation results demonstrate that the proposed LFDE with phase compensation architecture can provide good performance for a MIMO system impaired by CFOs over unbalanced multi-path channels with long delay spread. We also show that the performance will be improved if more layers are used at receivers.
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