A Novel Blind Integer CFO Estimator for OFDM Systems

Carrier frequency offset (CFO) in orthogonal frequency divisional multiplexing (OFDM) system severely degrades the transmission performance. This frequency offset can be divided into an integer part and a fractional part. The fractional part mainly introduces inter-carrier interference (ICI), while the integer part causes frequency ambiguity. In this paper, based on the underlying structure of the received OFDM symbols, a novel blind algorithm is proposed to estimate the integer part of CFO. Compared with the conventional M&M´s blind integer CFO estimator, the proposed one has considerably reduced computational load. Furthermore, simulation results show that under the multipath fading channel, the proposed estimator has lower probability of failure than the M&M´s estimator