首页|Geometrically Shaped 32QAM and Modified Binary Switching Coding Method in Underwater Visible Light Communication
Geometrically Shaped 32QAM and Modified Binary Switching Coding Method in Underwater Visible Light Communication
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Visible light communication(VLC)has emerged as a promising communication method in 6G,particularly in the domain of underwater communication.However,because of its intimate coupling to the light-emitting diodes(LED),the transmission rate is limited by the modulation bandwidth and the nonlinearity of the LED.With current device development,LED bandwidth is substantially lower than that of other optical commu-nication devices,necessitating improved spectral effi-ciency and nonlinearity robustness to achieve high-speed transmission.In this paper,we propose a hexagonal con-stellation-based geometrically shaped(GS)32QAM with carrierless amplitude and phase(CAP)modulation for the underwater VLC system.A comprehensive performance comparison of four GS modulation methods,including our proposed hexagonal-32QAM,normal 32QAM,square-32QAM and 32APSK is investigated in both theory and experiment.The hexagonal-32QAM with a modified bin-ary switching coding(BSC)can obtain a Q factor gain of 0.44 dB,and a data rate improvement of 25 Mb/s com-pared with Gary coding based normal 32QAM.The ex-perimentally results illustrate the feasibility of geometric shaping 32QAM in underwater visible light communica-tion.
SHI Jianyang、CAI Jifan、QIN Guojin、JIN Ruizhe、LIN Xianhao、CHI Nan
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Key Laboratory for Information Science of Electromagnetic Waves(MoE),Fudan University,Shanghai 200433,China
Peng Cheng Laboratory,Shenzhen 518055,China
Shanghai Engineering Research Center of Low-Earth-Orbit Satellite Communication and Applications,Shanghai 200433,China
Shanghai Collaborative Innovation Center of Low-Earth-Orbit Satellite Communication Technology,Shanghai 200433,China
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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaMajor Key Project of PCLChina Postdoctoral Science FoundationChina National Postdoctoral Program for Innovative Talents
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