Pilot-symbol aided channel estimation for OFDM with fast fading channels

Abstract

In this paper, we address the problem of estimating a rapidly-varying channel in Orthogonal Frequency Division Multiplexing (OFDM) systems. To handle rapid variation within a transmission block, we propose a novel pilot-based estimation scheme which uses channel interpolation. In addition, we develop a simple Doppler frequency estimation scheme. We show that the proposed scheme has better performance in the high-Doppler frequency by simulations.