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Differential phase-shift keying and channel equalization in free space optical communication system

机译：自由空间光通信系统中的差分相移键控和信道均衡

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摘要

We present the performance benefits of differential phase-shift keying (DPSK) modulation in eliminating influence from atmospheric turbulence, especially for coherent free space optical (FSO) communication with a high communication rate. Analytic expression of detected signal is derived, based on which, homodyne detection efficiency is calculated to indicate the performance of wavefront compensation. Considered laser pulses always suffer from atmospheric scattering effect by clouds, intersymbol interference (ISI) in high-speed FSO communication link is analyzed. Correspondingly, the channel equalization method of a binormalized modified constant modulus algorithm based on set-membership filtering (SM-BNMCMA) is proposed to solve the ISI problem. Finally, through the comparison with existing channel equalization methods, its performance benefits of both ISI elimination and convergence speed are verified. The research findings have theoretical Significance in a high-speed FSO communication system.
机译：我们提出了差分相移键控（DPSK）调制在消除大气湍流影响方面的性能优势，特别是对于通信速率较高的相干自由空间光学（FSO）通信而言。推导了被测信号的解析表达式，在此基础上，计算了零差检测效率以表示波前补偿的性能。考虑到激光脉冲始终受到云层对大气的散射影响，因此分析了高速FSO通信链路中的符号间干扰（ISI）。相应地，提出了一种基于集成员滤波的双归一化修正恒模算法的信道均衡方法，以解决ISI问题。最后，通过与现有信道均衡方法的比较，验证了ISI消除和收敛速度的性能优势。研究结果对高速FSO通信系统具有理论意义。

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  • 来源
    《Optical engineering》 |2018年第1期|015107.1-015107.8|共8页
  • 作者

    Dai Zhang; Shiqi Hao; Qingsong Zhao; Xiongfeng Wan; Chenlu Xu;

  • 作者单位

    Electronic Engineering Institute, State Key Laboratory of Pulsed Power Laser Technology, Hefei, Anhui, China;

    Electronic Engineering Institute, State Key Laboratory of Pulsed Power Laser Technology, Hefei, Anhui, China;

    Electronic Engineering Institute, State Key Laboratory of Pulsed Power Laser Technology, Hefei, Anhui, China;

    Electronic Engineering Institute, State Key Laboratory of Pulsed Power Laser Technology, Hefei, Anhui, China;

    Electronic Engineering Institute, State Key Laboratory of Pulsed Power Laser Technology, Hefei, Anhui, 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

    differential phase-shift keying; free space optical communication; channel equalization;

    机译：差分相移键控;自由空间光通信;通道均衡;

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