A novel three-stage frequency offset estimator for OFDM

作者:Wu, Yun*; Luo, Hanwen; Ding, Ming
来源:2nd IEEE International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2006), China,Hubei,Wuhan, 2006-09-22 to 2006-09-24.

摘要

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.