Inter-carrier interference (ICI) in a kth sub-carrier of an orthogonal frequency division multiplexing (OFDM) signal received at time t is reduced, wherein the received OFDM signal comprises a plurality of sub-carriers. This is achieved by generating a self-interference term, ICIk−L,k−L, for a signal received on sub-carrier k−L, wherein L ∈ [ . . . , −3,−2,−1,1,2,3, . . . ], and wherein the self-interference term is an estimate of the data received at time t on the sub-carrier k−L, weighted by a rate of change of the channel through which sub-carrier k−L passes at time t. An ICI cancellation coefficient, GL is obtained, and an estimated ICI term is generated by adjusting the self-interference term, ICIk−L,k−L, by an amount based on the ICI cancellation coefficient, GL. The estimated ICI term is then subtracted from a term representing a signal received on the kth sub-carrier at time t.