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Performance of coherent detection for FTN-DFTs-OFDM signal using receiver-side quadrature duobinary shaping

机译:使用接收机侧正交双二进制整形对FTN-DFTs-OFDM信号进行相干检测的性能

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摘要

In this paper we investigate Faster-than-Nyquist Discrete-Fourier-Transform spread Orthogonal Frequency Division Multiplexing (FTN-DFTs-OFDM) signaling which combines the features of both single carrier FTN and OFDM system. By introducing the quadrature duo-binary (QDB) filtering at the receiver side, the transmitted OFDM signal can be packed in a sub-Nyquist spacing, which improves the spectral efficiency (SE) compared to conventional detection schemes. Maximum a posteriori (MAP) and maximum likelihood sequence estimation (MLSE) criteria have been both used and compared to find an optimal equalization scheme for combating FTN multiplexing at transmitter side and QDB filtering at receiver side. The simulations result show that by applying QDB filtering at the receiver side, the back-to-back (BTB) required optical signal noise ratio (OSNR) at bit error rate (BER) of 1 x 10(-2) is reduced by 1.5-dB for 20-GHz spaced 128-Gb/s polarization-division-multiplexed quadrature-phase-shift-keying (PDM-QPSK) signal, achieving a SE of 6.4-b/s/Hz. (C) 2016 Elsevier Inc. All rights reserved.
机译:在本文中,我们研究了结合了单载波FTN和OFDM系统特征的快于奈奎斯特离散傅立叶变换扩展的正交频分复用(FTN-DFTs-OFDM)信令。通过在接收器端引入正交双二进制(QDB)滤波,可以将发送的OFDM信号打包在亚奈奎斯特间隔内,与传统的检测方案相比,可以提高频谱效率(SE)。已使用最大后验(MAP)标准和最大似然序列估计(MLSE)标准进行比较,以找到一种最佳均衡方案,以对抗发射机侧的FTN多路复用和接收机侧的QDB滤波。仿真结果表明,通过在接收器端应用QDB滤波,在1 x 10(-2)的误码率(BER)下,背靠背(BTB)所需的光信号噪声比(OSNR)降低了1.5 -dB适用于20 GHz间隔的128 Gb / s极化分频多路复用正交相移键控(PDM-QPSK)信号,SE达到6.4-b / s / Hz。 (C)2016 Elsevier Inc.保留所有权利。

著录项

  • 来源
    《Optical fiber technology》 |2016年第12期|66-70|共5页
  • 作者单位

    Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China;

    Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China;

    Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China;

    Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R 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

    DFT-spread-OFDM; Fast-than-Nyquist signaling; Quadrature duo-binary filtering; Maximum likelihood sequence estimation;

    机译:DFT-spread-OFDM;快于奈奎斯特信令;正交双二进制滤波;最大似然序列估计;

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