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The mitigation of InterCarrier Interference (ICI) in closed-loop Single-Input - Single-Output (SISO) and Multiple-Input - Multiple-Output (MIMO) Orthogonal Frequency-Division Multiplexing (OFDM) is considered. The authors show that the ICI coefficient matrix is approximately unitary and exploit this property to design a nonlinear Tomlinson - Harashima precoder for the reduction of ICI in closed-loop SISO OFDM and Orthogonal Space-Time Block-Coded (OSTBC) MIMO OFDM. With the proposed design, the transmitter does not need to know the frequency offsets, and hence, their impact on the Bit Error Rate (BER) is significantly reduced.
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