A Carrier Frequency Offset Estimation for Burst Transmission Based on EM Algorithm

In this paper, the problem of carrier frequency offset estimation for burst-mode transmission on the AWGN channel in GMSK system and OFDM system is exploited within the framework of the expectation-maximization (EM) algorithm. A joint pilot symbols and unknown data symbol CFO estimation algorithm based on EM is introduced. By exploiting the posterior information of the unknown data symbols which are referred to latent variable in EM algorithm and known pilot symbols jointly, the accuracy of the estimation can be improved effectively without degrading the spectral efficiency. Simulation results show that the proposed algorithm has a better performance than that of the conventional Data-Aided algorithm and the accuracy can achieve the Cramer-Rao Bound (CRB) at moderately high signal-to-noise ratios (SNR).