东华大学学报（英文版）2008，Vol.25Issue(6)：621-625,5.
A Novel Two-step Frequency Offset Estimator for OFDM
A Novel Two-step Frequency Offset Estimator for OFDM
摘要
Abstract
Based on an orthogonal frequency division multiplexing (OFDM) training symbol with I identical parts, a novel carrier frequency offset (CFO) estimator is proposed for OFDM systems.The CFO is estimated in two steps, fine estimate and coarse estimate.In the first step, the fine estimation is performed based on the principle of minimum variance.However, the fine estimation has ambiguity since its estimate range is limited.In the second step, the coarse estimation is obtained, which results in a larger estimate range but less precision.Using the coarse estimation, the ambiguity of fine estimation is resolved.To fully use the correlation among L identical parts, the fine estimation resolved the ambiguity and the coarse estimation are optimally combined to obtain the final estimation.Furthermore, the estimation variance of the proposed method is derived.Simulation results demonstrate that the novel two-step estimator outperforms the conventional two-step estimator in terms of estimate performance and computational complexity.关键词
frequency offset estimation/OFDM/training symbol/two-stepKey words
frequency offset estimation/OFDM/training symbol/two-step分类
信息技术与安全科学引用本文复制引用
WU Yun ,JIANG Xin-hua,XU Wu-jun..A Novel Two-step Frequency Offset Estimator for OFDM[J].东华大学学报（英文版）,2008,25(6):621-625,5.基金项目
Foundation item: Foundation of Donghua University, China (No.104100044027) （No.104100044027）
