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A novel technique for the estimation of Carrier Frequency Offset (CFO) in Orthogonal Frequency Division Multiplexing (OFDM) based Multiple Input Multiple Output (MIMO) communication systems is proposed in this paper. While the conventional null subcarrier based methods estimate the CFO through a single global line search, the proposed method employs a two step procedure. Firstly, the integer frequency offset is estimated by means of a cost function minimization over the trial integer offset values. Then the fractional frequency offset is estimated through a fine search over one subcarrier spacing on either side centered on zero offset reference after correcting the integer offset.
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