Performance Investigation of Underwater Retroreflective Optical Integrated Sensing and Communication System

WAN Xin; WANG Haochuan; YE Yang; ZENG Zhihong; LIU Min; LENG Min; CHEN Chen

doi:10.13756/j.gtxyj.2025.250103

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Performance Investigation of Underwater Retroreflective Optical Integrated Sensing and Communication System

更新时间：2025-08-16

- Performance Investigation of Underwater Retroreflective Optical Integrated Sensing and Communication System
- Study on Optical Communications Issue 4, (2025)
- 作者机构：
  
  1.重庆大学　微电子与通信工程学院，重庆　400030
  2.成都前锋电子仪器有限责任公司，成都　610000
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2025.250103
  CLC： TN929
- Received：30 March 2025，
  
  Revised：16 April 2025，
  
  Published：10 August 2025
- 稿件说明：
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万欣，王浩川，叶洋，等. 水下逆反射光通感一体化系统性能研究[J]. 光通信研究，2025(4): 250103.

Wan X, Wang H C, Ye Y, et al. Performance Investigation of Underwater Retroreflective Optical Integrated Sensing and Communication System[J]. Study on Optical Communications, 2025(4): 250103.
万欣，王浩川，叶洋，等. 水下逆反射光通感一体化系统性能研究[J]. 光通信研究，2025(4): 250103. DOI： 10.13756/j.gtxyj.2025.250103.

Wan X, Wang H C, Ye Y, et al. Performance Investigation of Underwater Retroreflective Optical Integrated Sensing and Communication System[J]. Study on Optical Communications, 2025(4): 250103. DOI： 10.13756/j.gtxyj.2025.250103.

摘要

【目的】

基于光波的逆反射光通感一体化（RO-ISAC）系统具有通信容量大和感知精度高的优势，能够为日益频繁的水下活动提供通信和感知能力。然而，水下RO-ISAC系统中角立方反射器（CCR）的有限视场角（FOV）严重限制了系统的有效感知范围，如何增大CCR的FOV来扩大系统有效感知范围是一个亟待解决的课题。另外，水下湍流对RO-ISAC系统通信与感知性能的影响也有待进一步探究。

【方法】

针对CCR的FOV有限问题，文章提出了一种基于角度分集结构的CCR阵列方案，该阵列由一个中心CCR单元和若干个呈圆周分布的边CCR单元组成，各个边CCR单元具有一定的倾斜角度。在基于角度分集CCR阵列的水下RO-ISAC系统中，采用正交频分复用（OFDM）作为通感融合波形，并通过Matlab软件仿真研究了该系统在水下湍流信道中的通信与感知性能。

【结果】

仿真结果表明，在相同等效反射面积情况下，角度分集CCR阵列能够显著增大CCR的FOV，并且随着角度分集CCR阵列中边CCR单元数量的增加，等效FOV随之增大，水下RO-ISAC系统的感知（即测距）性能也随之变好。同时，角度分集CCR阵列中边CCR单元的倾斜角度存在最佳区间，并且最佳倾斜角度区间与光信号的入射角度相关。另外，在基于OFDM通感融合波形的水下RO-ISAC系统中，水下湍流对系统的通信误码率（BER）性能影响较大，湍流越强，BER性能越差，而水下湍流对系统的测距性能并无明显影响。

【结论】

文章所提角度分集CCR阵列能够显著扩大水下RO-ISAC系统的有效感知范围，提升系统感知精度，同时，基于OFDM通感融合波形的水下RO-ISAC系统能够有效克服水下湍流对感知性能的不利影响。

Abstract

【Objective】

Lightwave-based Retroreflective Optical Integrated Sensing and Communication (RO-ISAC) systems have the advantages of large communication capacity and high sensing accuracy

which can offer communication and sensing capabilities for the underwater activities. However

the limited Field of View (FOV) of the Corner Cube Reflector (CCR) in underwater RO-ISAC systems greatly limits the effective sensing range of the system. Hence

how to increase the FOV of the CCR to expand the effective sensing range of the system is a subject that needs to be solved urgently. Moreover

the impact of underwater turbulence on the communication and sensing performance of the RO-ISAC system also remains to be further explored.

【Methods】

For the limited FOV issue of the CCR

we propose a CCR array scheme based on an angle diversity structure. The proposed angle diversity CCR array consists of a central CCR unit and multiple side CCR units distributed in a circle

where each side CCR unit has a certain tilt angle. In the underwater RO-ISAC system based on the angle diversity CCR array

Orthogonal Frequency Division Multiplexing (OFDM) is adopted as the ISAC waveform

and the communication and sensing performance of the RO-ISAC system in the underwater turbulence channel is studied through Matlab software simulation.

【Results】

Simulation results show that

under the condition of the same equivalent reflection area

the angle diversity CCR array can significantly increase the FOV of the CCR. Moreover

as the number of side CCR units in the angle diversity CCR array increases

the equivalent FOV also increases

and the sensing (i.e.

ranging) performance of the underwater RO-ISAC system improves accordingly. At the same time

there is an optimal interval for the tilt angle of the side CCR units in the angle diversity CCR array

which is highly related to the incident angle of the optical signal. In addition

in the underwater RO-ISAC system based on the OFDM waveform

underwater turbulence has a great impact on the Bit Error Rate (BER) performance of the system. When the turbulence is stronger

the BER performance is worse. In contrast

underwater turbulence has no obvious impact on the ranging performance of the system.

【Conclusion】

The proposed angle diversity CCR array can significantly expand the effective sensing range of the under-water RO-ISAC system and improve the sensing accuracy. At the same time

the underwater RO-ISAC system based on the OFDM waveform can effectively overcome the adverse effects of underwater turbulence on the sensing performance.

关键词

Keywords

references

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