Robust channel estimation for the OFDM-based WLAN systems with imperfect synchronization
Wireless Personal Communications: An International Journal
An exact error probability analysis of OFDM systems with frequency offset
IEEE Transactions on Communications
An improved residual frequency offset estimation scheme for OFDM based WLAN systems
Digital Signal Processing
BER of OFDM systems impaired by carrier frequency offset in multipath fading channels
IEEE Transactions on Wireless Communications
Single tone parameter estimation from discrete-time observations
IEEE Transactions on Information Theory
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Residual carrier frequency offset accumulates with time and leads to bit errors on later symbols in an OFDM packet. This paper is concerned with two methods for residual carrier frequency offset estimation, based on the DFT demodulated data of OFDM data symbols at the pilot subcarriers. One method computes an estimate from the phase difference between the data in two (or more) consecutive symbols. The other one, which was recently proposed, finds an estimate from the phase of the data in one (or more) symbol. The latter method requires the a priori knowledge or an estimate of the channel while the former does not. The two methods have been compared by first-order perturbation analysis and simulation. A flaw of the latter method has been identified. Preference should be given to the former method in terms of estimation accuracy and ease of implementation in practical scenarios.