Estimation of Stationary Phase Noise by the Autocorrelation of the ICI Weighting Function in OFDM Systems

Phase noise resulting in common phase error (CPE) and inter-carrier interference (ICI) is a critical challenge to the implementation of OFDM systems. Modeling phase noise as a stationary Gaussian random process with the specified power spectrum density, different from conventional approaches which mostly relay on pilots to provide CPE estimation, we explore the statistical characteristics of the sufficient statistics then propose a pilot-aided decision-directed approach according to maximum-likelihood criterion. Numerical results demonstrate that the proposed algorithm enjoys 2 dB gain at moderate SNR and is quite robust against possible model mismatch