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The SDM (Space Division Multiplexed) -COFDM (Coded Orthogonal Frequency Division Multiplexing) system has been proposed to improve frequency utilization efficiency by using a simple feed-forward ICI (Inter-Channel Interference) canceller to multiply the estimated propagation inverse matrix of a MIMO (Multi-Input Multi-Output) channel. However, when a carrier frequency offset between the transmitter and receiver exists, the orthogonality of the subcarrier between the SDM signals becomes lost and the performance degrades. This paper proposes a new AFC (Automatic Frequency Control) scheme which makes it possible to use a common carrier frequency by averaging the estimated frequency error of each receiver. Computer simulation shows that the proposed AFC scheme improves SDM-COFDM PER performance in frequency selective fading environments.

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