Adaptive stochastic resonance detection of weak light signal in underwater laser communication

Jianlei ZHANG; Xiang LAN; Yi YANG; Fengtao HE; Yunzhou ZHU

doi:10.37188/OPE.20223012.1383

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Adaptive stochastic resonance detection of weak light signal in underwater laser communication

Modern Applied Optics | 更新时间：2022-06-25

- Adaptive stochastic resonance detection of weak light signal in underwater laser communication
- Optics and Precision Engineering Vol. 30, Issue 12, Pages: 1383-1393(2022)
- 作者机构：
  
  1.西安邮电大学电子工程学院，陕西西安 710121
  2.中国科学院西安精密机械研究所，陕西西安 710077
  3.水下信息与控制重点实验室，陕西西安 710077
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20223012.1383
  CLC： TN929.1
- Received：29 September 2021，
  
  Revised：08 December 2021，
  
  Published：25 June 2022
- 稿件说明：
移动端阅览
张建磊,兰香,杨祎等.水下激光通信弱光信号的自适应随机共振检测[J].光学精密工程,2022,30(12):1383-1393.

ZHANG Jianlei,LAN Xiang,YANG Yi,et al.Adaptive stochastic resonance detection of weak light signal in underwater laser communication[J].Optics and Precision Engineering,2022,30(12):1383-1393.
张建磊,兰香,杨祎等.水下激光通信弱光信号的自适应随机共振检测[J].光学精密工程,2022,30(12):1383-1393. DOI： 10.37188/OPE.20223012.1383.

ZHANG Jianlei,LAN Xiang,YANG Yi,et al.Adaptive stochastic resonance detection of weak light signal in underwater laser communication[J].Optics and Precision Engineering,2022,30(12):1383-1393. DOI： 10.37188/OPE.20223012.1383.

摘要

针对水下无线光通信（Underwater Optical Wireless Communication，UOWC）系统中由于低信噪比导致的接收光信号被淹没在强噪声中难以检测的问题，提出一种基于自适应随机共振（Adaptive Stochastic Resonance，ASR）的水下弱光信号检测方法。本文通过分析水下弱光信号的特点及随机共振的检测机理，引入二次采样，使随机共振可以适用于任意频率下的光信号检测。分析影响随机共振系统的参数，提出改进蚁群算法与随机共振相结合的检测方法，根据检测性能动态的调整系统参数，使系统达到最优匹配状态，实现自适应随机共振。为验证方法的有效性，搭建了基于雪崩光电二极管（Avalanche Photodiode，APD）的UOWC实验系统，实验结果表明，在信噪比SNR=

4.559 5 dB时，误码率为5×10

，进一步证明了基于自适应随机共振的水下弱光信号检测可以显著提高UOWC接收机的误码率性能。

Abstract

In underwater optical wireless communication （UOWC） systems， the low signal-to-noise ratio causes received optical signals to be submerged in strong noise. To solve this problem， a detection method for underwater weak optical signals based on adaptive stochastic resonance （ASR） is proposed. In this study， the characteristics of underwater weak light signals and the detection mechanism of stochastic resonance are analyzed. The concept of twice sampling is introduced to enable the application of stochastic resonance to optical signal detection at any frequency. Additionally， the parameters that affected the stochastic resonance system are evaluated， and a detection method combining the improved ant colony algorithm and stochastic resonance is proposed. The system dynamically adjusts the system parameters based on the detection performance， such that the entire system achieves the optimal matching state to realize ASR. To verify the effectiveness of the method， a UOWC experimental system based on an avalanche photodiode is built. The experimental results show that the bit error rate is 5×10

when SNR=

4.559 5 dB. Thus， underwater weak light signal detection based on ASR is proved to significantly improve the bit error rate performance of UOWC receivers.

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