In this paper, we investigate two phase synchronisation schemes for FBMC/OQAM (lterbank based multicarriers) in ber-optic transmissions. We start by investigating pilotbased phase synchronisation, using the so-called auxiliary pilot method [2] consisting in using the pilot's neighbour symbol to compensate for the imaginary intersymbol interference. We derive the maximum likelihood estimator based on the observation of the pilots and analyse its performance. In the second part, taking advantage of the particular shape of the received constellation, a semi-blind channel estimation scheme presented in [3] is adapted to the phase synchronisation issue. It uses the spatial-sign covariance matrix to identify the main variance axis and infer the rotation of the constellation. Both methods are compared and their performance is analyzed by simulations.
Navaux, M., Rottenberg, F., & Louveaux, J. (2015). Phase Synchronisation for FBMC/OQAM Fiber-Optic Transmissions. Proceedings of the 36th Symposium on Information Theory in the Benelux. Published. 36th Symposium on Information Theory in the Benelux, Brussels, Belgium. https://hdl.handle.net/2078.5/229080