Two stage extended Kalman filtering for joint compensation of frequency offset, linear and nonlinear phase noise and amplitude noise in coherent QAM systems

We investigate our proposed two stage extended Kalman filtering (EKF) technique for the joint tracking of frequency offset (FO), laser phase noise, fiber nonlinearity as well as amplitude noise. The EKF employed in the first stage coarsely compensates the FO using a set of training data symbols. In the second stage, the employed EKF accomplishes the task of… CONTINUE READING