A High Performance Frequency Offset Estimation Method for OFDM

In this paper, we proposed a three-step frequency offset estimation method using a special training frame designed for cable channel in OFDM systems. By making use of the PN-sequence preambles of the training frame, the coarse frequency offset estimation is achieved by the two initial steps. In order to estimate fine frequency offset, we utilize quartic method to eliminate the influence of modulation on the payload data of the training frame. By configuring the three-step estimation neatly, the proposed method makes it possible to realize large span of frequency offset estimation even to half of the system bandwidth, and has high estimation precision. Simulations in AWGN and multipath channels proved the validity of this technique.