Robust frequency offset estimator for OFDM over fast varying multipath   channel
  This paper presents a robust carrier frequency offset(CFO) estimation algorithm suitable for fast varying multipath channels. The proposed algorithm estimates CFO both in time-domain and frequency-domain using two carefully designed sequences. This novel technique possesses high accuracy as well as large estimation range and works well in fast varying channels. 
Li Wei, Youyun Xu, Yueming Cai and Xin Xu
cs.IT math.IT