Darryl Dexu Lin Teng Joon Lim The Variational Inference Approach to Joint Data Detection and Phase Noise Estimation in OFDM. 1862-1874 2007 55 IEEE Transactions on Signal Processing 5-1 http://doi.ieeecomputersociety.org/10.1109/TSP.2006.890915 db/journals/tsp/tsp55.html#LinL07