Improved Amplitude and Phase Noise Mitigation for 16QAM Transmission Using Viterbi-Viterbi Phase Estimator Combined with Extended Kalman Filter

Viterbi-Viterbi phase estimator combined with extended Kalman filter (VVPE-EKF) is proposed to mitigate both amplitude and phase noise. 24% and 20% maximum transmission reach are gained compared with VVPE and VVPE maximum-likelihood (VVPE-ML) algorithms.