In this paper, we present a novel data-based method for simultaneous Maximum Likelihood

(ML) symbol and carrier-frequency o畇et estimation in Orthogonal frequencydivision

multiplexing (OFDM) systems. Statistical properties introduced by the cyclic

pre痻, a guard space between OFDM symbols, provide su眂ient information about the

unknown parameters. It is shown that the redundancy introduced by this cyclic pre痻

allows the estimation to be performed without additional pilots. Simulations show that

the performance of the frequency estimator is applicable in a tracking mode while the

timing estimation can be used in an acquisition mode.