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Title: Soft-decision-aided, maximum-likelihood carrier phase estimation for coherent optical qam
Authors: Wu, M.-W. 
Kam, P.-Y. 
Keywords: laser phase noise
maximum likelihood
phase estimation
Issue Date: 2013
Citation: 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.
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
ISSN: 07338724
DOI: 10.1109/JLT.2013.2279593
Appears in Collections:Staff Publications

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