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Comparison of soft-input-soft-output detection methods for dual-polarized quadrature duobinary system

机译：双极化正交双二进制系统的软输入软输出检测方法比较

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摘要

Three soft-input-soft-output (SISO) detection methods for dual-polarized quadrature duobinary (DP-QDB), including maximum-logarithmic-maximum-a-posteriori-probability-algorithm (Max-log-MAP)-based detection, soft-output-Viterbi-algorithm (SOVA)-based detection, and a proposed SISO detection, which can all be combined with SISO decoding, are presented. The three detection methods are investigated at 128 Gb/s in five-channel wavelength-division-multiplexing uncoded and low-density-parity-check (LDPC) coded DP-QDB systems by simulations. Max-log-MAP-based detection needs the retuming-to-initial-states (RTIS) process despite having the best performance. When the LDPC code with a code rate of 0.83 is used, the detecting-and-decoding scheme with the SISO detection does not need RTIS and has better bit error rate (BER) performance than the scheme with SOVA-based detection. The former can reduce the optical signal-to-noise ratio (OSNR) requirement (at BER = 10~(-5)) by 2.56 dB relative to the latter. The application of the SISO iterative detection in LDPC-coded DP-QDB systems makes a good trade-off between requirements on transmission efficiency, OSNR requirement, and transmission distance, compared with the other two SISO methods.
机译：三种用于双极化正交双二进制（DP-QDB）的软输入软输出（SISO）检测方法，包括基于最大对数，最大后验概率算法（Max-log-MAP）的检测，提出了基于软输出维特比算法（SOVA）的检测方法，以及提出的SISO检测方法，该方法可以与SISO解码结合使用。通过仿真研究了在五通道波分复用未编码和低密度奇偶校验（LDPC）编码的DP-QDB系统中以128 Gb / s的速度检测这三种检测方法。尽管基于Max-log-MAP的检测性能最佳，但仍需要将其恢复到初始状态（RTIS）过程。当使用编码率为0.83的LDPC码时，与基于SOVA的检测方案相比，具有SISO检测的检测和解码方案不需要RTIS，并且具有更好的误码率（BER）性能。前者可以将光信噪比（OSNR）要求（在BER = 10〜（-5）时）降低2.56 dB。与其他两种SISO方法相比，SISO迭代检测在LDPC编码的DP-QDB系统中的应用在传输效率，OSNR要求和传输距离的要求之间取得了很好的折衷。

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  • 来源
    《Optical engineering》 |2018年第2期|026101.1-026101.10|共10页
  • 作者

    Chun Chang; Benxiong Huang; Zhengguang Xu; Bin Li; Nan Zhao;

  • 作者单位

    Hubei University of Technology, Hubei Collaborative Innovation Center for High-Efficiency Utilization of Solar Energy, Wuhan, China,Huazhong University of Science and Technology, School of Electronic Information and Communications, National Engineering Laboratory for Next Generation Internet Access System, Wuhan, China;

    Huazhong University of Science and Technology, School of Electronic Information and Communications, National Engineering Laboratory for Next Generation Internet Access System, Wuhan, China;

    Huazhong University of Science and Technology, School of Electronic Information and Communications, National Engineering Laboratory for Next Generation Internet Access System, Wuhan, China;

    Huazhong University of Science and Technology, School of Electronic Information and Communications, National Engineering Laboratory for Next Generation Internet Access System, Wuhan, China;

    Hubei University of Technology, Hubei Collaborative Innovation Center for High-Efficiency Utilization of Solar Energy, Wuhan, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    duobinary shaping; quadrature duobinary; soft-input-soft-output detection; maximum-likelihood sequence detection; maximum-logarithmic-maximum-a-posteriori-probability-algorithm; soft-output-Viterbi-algorithm; low-density parity-check;

    机译：双二进制整形;正交双二进制软输入软输出检测;最大似然序列检测;最大对数最大后验概率算法;软输出维特比算法;低密度奇偶校验;

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