In this paper, we investigate the problem of carrier frequency offset (CFO) estimation for orthogonal frequency division multiplexing (OFDM) system over doubly-selective channels. Representing the doubly-selective channels with basis expansion, the signal model is reformulated and one CFO estimator is derived. Furthermore, the Cramer-Rao bound (CRB) for the estimation problem is derived in closed form. The effectiveness of the proposed scheme is verified by simulations.
['Jianwu Chen', 'Yik-Chung Wu', 'Tung-Sang Ng']
Frequency synchronization for OFDM systems over doubly-selective channels