Hussein Hijazi Laurent Ros Bayesian Cramer-Rao bounds for complex gain parameters estimation of slowly varying Rayleigh channel in OFDM systems. 111-115 2009 89 Signal Processing 1 http://dx.doi.org/10.1016/j.sigpro.2008.07.017 db/journals/sigpro/sigpro89.html#HijaziR09