Low-calculation-cost fading channel prediction using chirp Z-transform

A low-complexity method to predict fast fading channels by estimating the parameters of the channel from the Doppler spectrum calculated using chirp Z-transform (CZT) is presented. The CZT fits the frequency-domain channel prediction for its ability to interpolate data points in the frequency domain, which reduces the frequency-quantisation error. Our evaluation results with time-division duplex show that the CZT method can significantly increase the channel prediction accuracy. The calculation cost of the CZT-based method is much lower compared to that of the zero-padding, autoregressive or high-resolution methods.