An improved frequency offset estimator for OFDM applications

An effecient algorithm has been proposed by Schmidl and Cox for carrier fre quency estimation in orthogonal frequency-division multiplexing systems. Th e scheme is based on the transmission of a training symbol composed of two identical halves in the time domain. In this paper we extend this algorithm by considering a training symbol composed of L>2 identical parts, This mak es it possible to achieve re better accuracy at the cost of some increase i n computational load. The estimation range can be made as large as desired without the need of a second training symbol, as required by the Schmidl an d Cox method.