Mobile Fading Channels
ICI mitigation for pilot-aided OFDM mobile systems
IEEE Transactions on Wireless Communications
Effect of Doppler spread in OFDM-based UWB systems
IEEE Transactions on Wireless Communications
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This paper introduces an adaptive time interpolator for orthogonal frequency division multiplexing (OFDM) systems in time-variant channels. The off-diagonals of the channel matrix, which represent the inter-carrier interference (ICI) coefficients, are estimated by approximating the channel over few successive symbols making use of Taylor and Lagrange polynomial interpolation. The interpolation degree is adapted according to the estimated Doppler spread aiming at minimizing the bit error rate (BER) performance as a subject to the processing delay.