A processor adapted to process a signal comprising a plurality of sub-carriers wherein the processor is configured to process a plurality of instances of a first frequency-divided multiplexed subcarrier, each instance of the first subcarrier comprising a Fourier-transformed instance of a symbol, said processor being arranged to: estimate, fr each instance of the symbol, the channel gain and inter-carrier interference contribution to said symbol from other subcarriers of the plurality of subcarriers, wherein the inter-carrier interference contributions are estimated by expressing each of the respective channel responses as a truncated Taylor series expansion including at least one time-variable term related to the inter-carrier interference contribution, wherein some of the symbols are pilot symbols that are known a priori, wherein received signals for pilot subcarriers are used to estimate the channel gains, and wherein for other subcarriers in which data is transmitted the channel gains are estimated by interpolating in time and frequency over the channel gains estimated for the pilot subcarriers; combine each instance of the symbol including said channel gain and inter-carrier interference contributions based on the estimated channel gain and estimated inter-carrier interference contributions of the instances of the symbol using combining metrics to produce a single representation of said symbol having reduced inter-carrier interference, wherein the combination of the subcarrier signals is based on the estimated inter-carrier interference contributions of the subcarrier from its nearest neighbor subcarriers only; and combine subcarriers relating to the same symbol in respective instances of a symbol using a minimum mean-squared error metric to obtain an improved signal-to-interference-and-noise ratio for said symbol, wherein the instances of the first subcarrier are received by different receive antennas. estimate, fr each instance of the symbol, the channel gain and inter-carrier interference contribution to said symbol from other subcarriers of the plurality of subcarriers, wherein the inter-carrier interference contributions are estimated by expressing each of the respective channel responses as a truncated Taylor series expansion including at least one time-variable term related to the inter-carrier interference contribution, wherein some of the symbols are pilot symbols that are known a priori, wherein received signals for pilot subcarriers are used to estimate the channel gains, and wherein for other subcarriers in which data is transmitted the channel gains are estimated by interpolating in time and frequency over the channel gains estimated for the pilot subcarriers; combine each instance of the symbol including said channel gain and inter-carrier interference contributions based on the estimated channel gain and estimated inter-carrier interference contributions of the instances of the symbol using combining metrics to produce a single representation of said symbol having reduced inter-carrier interference, wherein the combination of the subcarrier signals is based on the estimated inter-carrier interference contributions of the subcarrier from its nearest neighbor subcarriers only; and combine subcarriers relating to the same symbol in respective instances of a symbol using a minimum mean-squared error metric to obtain an improved signal-to-interference-and-noise ratio for said symbol, wherein the instances of the first subcarrier are received by different receive antennas.