A Novel Three-Stage Frequency Offset Estimator for OFDM

A novel frequency offset estimate method is proposed for OFDM systems. In the proposed method, a special preamble composed of two training symbol blocks with several wide-sense identical parts is designed. To obtain a large estimate range together with a good estimation performance, a novel three-stage CFO estimate scheme based on the designed preamble is proposed. In this scheme, initial CFO estimates are first obtained over the two training symbol blocks by means of a novel two-stage estimate method. In the third stage, the two initial CFO estimates are jointly used to enlarge the CFO estimate range. Simulation results demonstrate that the novel three-stage frequency offset estimator has a satisfying estimate performance while achieving a large estimate range and maintaining a low computational complexity