Time and frequency domain channel estimation scheme for IEEE 802.11p

In this paper, we propose a time and frequency domain channel estimation scheme, which is based on the frequency domain interpolation of the reliable data pilots obtained from the time domain, for IEEE 802.11p standard. A number of reliable channel estimates are selected through the reliability test on the initial channel estimates, and then they are interpolated in the frequency domain to recover the channel estimates at the unreliable data subcarriers. Due to the correlation between adjacent subcarriers, the frequency domain interpolation can provide the better channel estimates for the unreliable data pilots. Furthermore, the proposed scheme can exploit the four comb pilots for the frequency domain interpolation, which improves the accuracy in the estimation at the carriers adjacent the four pilots. Simulation results demonstrate the excellent performance of the proposed channel estimation scheme especially in higher order modulation schemes and in higher mobility environments.