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《Acta Optica Sinica》 2017-08
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Indoor Visible Light Communication System Based on Non-Orthogonal Multiple Access

Jia Kejun;Hao Li;Bai Lijun;Yu Caihong;Key Laboratory of Information Coding and Transmission,Sichuan Province,Southwest Jiaotong University;School of Computer and Communication,Lanzhou University of Technology;School of Information Science and Engineering,Fujian University of Technology;  
Achieving large system capacity is a challenge due to the narrow modulation bandwidth of the white lightemitting diode(LED)in visible light communication.The system capacity can be improved by the non-orthogonal multiple access(NOMA)technique which can reuse power.A NOMA-DCO-OFDM system which is a combination of NOMA technology and direct-current-biased optical orthogonal frequency division multiplexing(DCO-OFDM)is proposed.Furthermore,a modeling method for VLC multipath channel is proposed based on the recursive method when a single LED is used.The signal to interference and noise ratio of users is derived when the clipping noise is considered.We also study the relationship among average sum rate of system,half power semi-angles of LED,field of views(FOV)of photoelectric detector and power distribution factor with methods of fractional order power allocation,gain ratio power allocation and static power allocation.The simulation results indicate that the average sum rate of system changes with the changing of half power semi-angles of LED,field of views(FOV)of photoelectric detector and power distribution factor,and the maximum average sum rate can be achieved when we optimize the half power semi-angles,FOV and power distribution factor.
【Key Words】: optical communications visible light communication non-orthogonal multiple access direct-current-biased optical orthogonal frequency division multiplexing multipath channel successive interference cancellation
【Fund】: 国家自然科学基金(61461026 61465007);; 东南大学移动通信国家重点实验室开放研究基金(2014D13)
【CateGory Index】: TN929.1
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