摘要
水下无线光通信(Underwater Wireless Optical Communication,UWOC)逐渐成为海洋探测领域一项越来越重要的技术。得益于水下光通信器件的不断发展,UWOC的通信速率越来越高,可达Gbit/s,但传输距离往往在百米以内,限制了UWOC的应用。扩频技术以一定的信号带宽为代价,可以提高UWOC的接收端灵敏度,延长其传输距离,并提高系统的抗干扰能力。通过对扩频技术进行仿真分析和实验测试,验证了其用于延长UWOC传输距离方案的可行性,且实验结果与仿真结果相吻合。其中,当信号带宽为200 MHz时,使用扩频技术可以将系统接收灵敏度提升约4.8 dB。最后提出将扩频技术应用于基于单光子探测器的UWOC系统,并通过仿真验证了其可行性。
Recently,underwater wireless optical communication(UWOC)has gradually become popular in ocean explorations.Thanks to the development of devices in underwater optical communication,the communication rate of UWOC is as high as several Gbit/s.However the transmission distance is still within 100 meters,which greatly limits the application of UWOC.At the expense of certain signal bandwidth,spread spectrum technology can improve the anti⁃interference ability and the receiver sensitivity of the UWOC system,thus extending the transmission distance.The feasibility of using spread spectrum technology to extend the transmission distance of UWOC is analyzed by simulation and demonstration experiment.And experimental results match well with the simulated ones.When the signal bandwidth is 200 MHz,the adoption of spread spectrum technology can improve the receiver sensitivity by 4.8 dB in this experi⁃ment.Finally,the feasibility of spread spectrum technology being applied to the UWOC systems based on single photon detectors is pro⁃posed and verified by simulation.
作者
吕伟超
徐敬
Lü Weichao;XU Jing(Optical Communications Laboratory,Ocean College,Zhejiang University,Zhoushan 316021,China;The Engineering Research Center of Oceanic Sensing Technology and Equipment,Ministry of Education,Zhoushan 316021,China)
出处
《无线电通信技术》
2021年第4期410-415,共6页
Radio Communications Technology
基金
国家重点研发计划(2016YFC1401202,2017YFC0306601,2017YFC0306100)
国家自然科学基金项目(61971378)。
关键词
水下无线光通信
扩频技术
传输距离
单光子探测器
underwater optical wireless communication
spread spectrum technology
transmission distance
single photon ava⁃lanche diode
