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|Title:||Soft-decision-aided, maximum-likelihood carrier phase estimation for coherent optical qam|
|Authors:||Wu, M.-W. |
|Keywords:||laser phase noise|
|Source:||Wu, M.-W., Kam, P.-Y. (2013). Soft-decision-aided, maximum-likelihood carrier phase estimation for coherent optical qam. Journal of Lightwave Technology 31 (22) : 3443-3452. ScholarBank@NUS Repository. https://doi.org/10.1109/JLT.2013.2279593|
|Abstract:||A novel, soft-decision-aided, maximum likelihood (SDA-ML) phase estimator is derived for carrier phase estimation in coherent optical communication. For estimating the carrier phase of the current symbol, SDA-ML uses both the feedback of earlier soft data decisions and the feedforward of later soft data decisions. The estimator is applicable to arbitrary 2-D modulations, where the symbols can have unequal energies and unequal a priori probabilities, and the constellation can be asymmetrical. An iterative SDA-ML algorithm and a simplified DA-SDA-ML algorithm with a reduced computational complexity are proposed. Both algorithms have no phase ambiguity. The data detector does not require to estimate the phase explicitly. Simulations show that SDA-ML and DA-SDA-ML outperform the $M$th power and DA-ML in the presence of strong linear laser phase noise. © 2013 IEEE.|
|Source Title:||Journal of Lightwave Technology|
|Appears in Collections:||Staff Publications|
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