A Novel Periodogram-Based Frequency Offset Estimation Method for OFDM Systems

The frequency offset estimation is one of the most important tasks in orthogonal frequency division multiplexing (OFDM) communication systems. To estimate frequency offset, a periodogram-based estimator has been proposed by Ren [6]. The method consists of three estimation steps and gives an accurate results. However, in the second and third estimation steps, the maximum frequency offset that can be estimated is limited by subcarrier spacing. This range is insufficient compared with the overall signal bandwidth, and causes high complexity in the first estimation step. In this paper, we propose a novel frequency offset estimation method with wide estimation range. The proposed method can efficiently extend the estimation ranges without loss of accuracy. Keyword: OFDM, frequency offset, periodogram, estimation, wide range.