Flexible decision-aided maximum likelihood phase estimation for optical coherent QAM signals

Ping Wang, Jian Chen, Xiaodi You, Zhaohui Ma, Xue Liu, Changyuan Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)


� 2016, Chinese Lasers Press. All right reserved. Flexible decision-aided maximum likelihood (DAML) phase estimation method is proposed, which extends from the phase shifted keying (PSK) system to the quadrature amplitude modulation (QAM) system, and the phase estimation error is derived. Simulation results show that the flexible DAML has a lower bound of bit error ratio (BER) for different block lengths, which can eliminate the block length effect from the conventional DAML and effectively reduce the requirement of signal phase fluctuation in the process of signal detection, thereby it loosens the restriction on laser linewidth in coherent optical systems.
Original languageEnglish
Article number0806007
JournalGuangxue Xuebao/Acta Optica Sinica
Issue number8
Publication statusPublished - 10 Aug 2016


  • Carrier phase estimation
  • Flexible decision-aided maximum likelihood
  • Laser phase noise
  • Optical communication
  • Quadrature amplitude modulation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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