Joint weighted least squares estimation of frequency and timing offset for OFDM systems over fading channels

This paper presents an algorithm for joint estimation of carrier frequency offset and timing frequency offset in orthogonal frequency division multiplexing (OFDM) systems. A weighted least squares algorithm based on a pilot-aided scheme is proposed. The algorithm operates near the Cramer-Rao bound in the variance of estimation errors. Simulations of several estimation algorithms in a multipath fading channel show that this algorithm provides the most accurate estimation in both the carrier frequency offset and the timing frequency offset.