Kalman filter carrier and polarization-state tracking.

@article{Marshall2010KalmanFC,
  title={Kalman filter carrier and polarization-state tracking.},
  author={Todd E. Marshall and Bogdan Szafraniec and Bernd Nebendahl},
  journal={Optics letters},
  year={2010},
  volume={35 13},
  pages={2203-5}
}
Application of Kalman filtering with a novel nearest-symbol constraint enables dynamic tracking of carrier phase and polarization state. Thereby, the proposed Kalman filter accomplishes demodulation of optical polarization-multiplexed complex modulation format signals. 

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