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。
【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 capa⁃bilities for the underwater activities.However,the limited Field of View(FOV)of the Corner Cube Reflector(CCR)in under⁃water 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.【Meth⁃ods】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 al⁃so 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 re⁃lated 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 stron⁃ger,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.
作者
万欣
王浩川
叶洋
曾志宏
刘敏
冷敏
陈晨
WAN Xin;WANG Haochuan;YE Yang;ZENG Zhihong;LIU Min;LENG Min;CHEN Chen(School of Microelectronics and Communication Engineering,Chongqing University,Chongqing 400030,China;Chengdu Qianfeng Electronic Instrument Co.,Ltd.,Chengdu 610000,China)
出处
《光通信研究》
北大核心
2025年第4期28-34,共7页
Study on Optical Communications
基金
国家自然科学基金资助项目(62271091)
重庆市自然科学基金资助项目(cstc2021jcyj-msxmX0480)
中央高校基本科研业务费专项资金资助项目(2024CDJXY020)。
作者简介
万欣(1984-),男,湖北武汉人。博士,主要研究方向为水下光通信和光通感一体化;通信作者:冷敏,工程师。E⁃mail:lengmin@126.com;通信作者:陈晨,研究员。E⁃mail:c.chen@cqu.edu.cn。
