Joint ICI cancellation and channel estimation with real-time channel adaptation for high-mobility OFDM systems

Orthogonal frequency division multiplexing systems suffer severely from several highly time-variant channel effects under conditions of high-mobility. To cope with this issue, we propose a low-complexity receiver architecture utilizing interference cancellation followed by a real-time channel parameter extraction for channel estimation. The estimated parameters for the delay spread in power delay profiles can be tracked iteratively using an adaptive filter, according to the current received signal and channel information. The numerical simulations show that this approach achieves system performance closely to the ideal channel correlation. With the real testbed field measured channel models on Taiwan high speed rail, we proved a significant gain improvement (2-8 dB at SNR of 30 dB) under scenarios of high-mobility.