Interpolation techniques for OFDM channel estimation

Receivers used conventional estimation methods assume a timeinvariant for the channel during one OFDM symbol, but in fading channels with very high mobility, the time variation of channel over an OFDM symbol results in a loss of subchannel orthogonality which leads to ICI. In this study, interpolation methods are used for pilot symbol assisted channel estimation for OFDM systems. Selection of interpolation method effects the performance and complexity of the system. Performance of selected methods was investigated and compared by means of simulations.