Nonlinear coded nonuniform superposition QAM by trellis-coding for MISO system in visible light communication  

作　　者：Zengyi Xu Wenqing Niu Jianyang Shi Nan Chi 徐增熠;牛文清;施剑阳;迟楠(Key Laboratory for Information Science of Electromagnetic Waves(MoE),Department of Communication Science and Engineering,Fudan University,Shanghai 200433,China;Peng Cheng Laboratory,Shenzhen 518055,China)

机构地区：[1]Key Laboratory for Information Science of Electromagnetic Waves(MoE),Department of Communication Science and Engineering,Fudan University,Shanghai 200433,China [2]Peng Cheng Laboratory,Shenzhen 518055,China

出　　处：《Chinese Optics Letters》2022年第4期71-76,共6页中国光学快报（英文版）

基　　金：This work was partially supported by the National Natural Science Foundation of China(Nos.61925104,62031011,and 62074072);China National Postdoctoral Program for Innovative Talents(No.BX2021082);China Postdoctoral Science Foundation(No.2021M700025);Major Key Project of PCL(No.PCL2021A14).

摘　　要：In this paper,we propose a 36-quadrature amplitude modulation(QAM)superposition modulation technique that is featured with uneven symbol probability by nonlinear precoding,named nonlinear coded nonuniform superposition(NCNS)QAM.Its aim is to alleviate the nonlinearity effect caused by high instantaneous power in multi-input single-output(MISO)visible light communication(VLC)system,with an uneven probabilistic-shaped constellation.The transmitter includes two LEDs to send signals independently,and the receiver uses a photo detector to receive the superposed QAM signal.The experiment results show that NCNS has a better robustness against nonlinearity than pulse amplitude modulation 4,approximately gaining a 16% increase in maximum usable peak-to-peak voltage and a 33% enlargement in dynamic range area.It is a simple but effective approach to solve the bandwidth limits related to signal power and hopefully be applied in large power VLC systems such as underwater VLC,or to improve the robustness against power fluctuation.

关 键 词：visible light communication light-emitting diode multi-input single-output quadrature amplitude modulation nonlinear coding spectral shaping 

分 类 号：TN929.1[电子电信—通信与信息系统]