An Improved Non Data Aided Carrier Frequency Offset Estimation Algorithm for OFDM Systems

In his paper, an improved non data aided (NDA) carrier frequency offset (CFO) estimation algorithm for Orthogonal Frequency Division Multiplexing (OFDM) systems was proposed. The proposed algorithm was based on two existed NDA algorithms which were analyzed and their channel models' assumptions were introduced at the beginning of this paper. The proposed algorithm composed the two algorithms' cost functions through a adjust factor, which could utilize data information more sufficiently than the two existed algorithms when the two channel assumptions were all satisfied at the same time. When the two channel assumptions could not be satisfied at the same time, the proposed cost function would degenerate to one of the two existed cost function automatically. At last, the simulation results confirmed that the proposed algorithm had better performance in both static channel and time varying multi-path delay channel than the two existed algorithms.