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Low complexity carrier phase estimation for m-QAM optical communication systems

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Abstract

A low complexity carrier phase estimation (CPE) algorithm for M-ary quadrature amplitude modulation (m-QAM) optical communication systems is investigated in this paper. In the proposed CPE algorithm, a two-stage CPE method is adopted. In the first stage, the QPSK points of the constellation are picked out to achieve a coarse phase estimation using the traditional Viterbi and Viterbi algorithm. In the second stage, all the points of the constellation are used for a fine phase estimation. In addition, the fourth-power operation is replaced by the 4-level absolute operation for the removal of modulated data phase, which greatly reduced the complexity. The proposed method was investigated through simulation, with 16-QAM, 32-QAM and 64-QAM modulation formats, respectively. The simulation results show that the proposed algorithm has both good linewidth tolerance and amplified spontaneous emission noise tolerance as well as low complexity. Moreover, when the equalization enhanced phase noise is considered, the proposed method also has better performance than traditional algorithm.

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Acknowledgments

This work was supported by Open Foundation of State Key Laboratory of Optical Communication Technologies and Networks (Wuhan Research Institute of Posts & Telecommunications), and China Southern Power Grid Projects. The authors wish to thank Dr. Shaohua Yu from Wuhan Research Institute of Posts & Telecommunications for his help.

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Author notes

  1. Yuan Li and Qiang Zheng have contributed equally to this work and should be considered co-first authors.

Authors and Affiliations

  1. Department of Computer Science, Central China Normal University, Wuhan, 430079, People’s Republic of China

    Yuan Li

  2. Wuhan National Lab for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China

    Qiang Zheng, Jilong Han & Wei Li

  3. China Southern Power Grid, Guangzhou, 510530, People’s Republic of China

    Yao Xie

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  1. Yuan Li
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  2. Qiang Zheng
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  3. Yao Xie
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  4. Jilong Han
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  5. Wei Li
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Correspondence to Wei Li.

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Li, Y., Zheng, Q., Xie, Y. et al. Low complexity carrier phase estimation for m-QAM optical communication systems. Photon Netw Commun 38, 121–128 (2019). https://doi.org/10.1007/s11107-019-00833-3

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