Research On Interference Management And Implement Mechanism Of Heterogeneous Visible Light Communication Network

With the continuous development of visible light communication technology,VLC network architecture research is more and more important.Compared with radio frequency communication technology,the deployment of visible light communication network will also lead to dense networking to form multi-level heterogeneous network,accompanied by user management,resource scheduling and handoff problems,which urgently need simple and efficient interference management mechanism and user management mechanism.This paper focuses on the research of indoor VLC heterogeneous network,analyzes its possible problems,and does two innovative works as follows:Firstly,an interference management scheme for visible light communication system based on multi-point cooperative transmission technology is proposed.In view of the interference between access points(AP)at the same level and between APs at different levels in indoor VLC heterogeneous networks,this interference management scheme is proposed.First,the cooperation area between each AP is designed.Users will upload their own location tags according to their own location,and each AP will decide whether to transmit them jointly according to the user tags.In the scheme,the format of AP data frame is also designed.In order to provide more efficient services for users,the data of central users will not affect the edge users,and the edge users will receive the data information jointly transmitted by multiple APS at the same time,which ensures the transmission rate of edge users.The simulation results show that the use of multi-point cooperation technology can effectively use the original information as interference,effectively reduce the interference in the system,improve the throughput of the system edge users,and the overall throughput distribution of the system tends to be flat,no longer into a multi-peak distribution.The system also effectively reduces the number of handoff actions caused by the user's movement,and ensures the reliability of network services to a certain extent.Secondly,according to the scheme designed in this paper,the visible light heterogeneous network experimental platform is built.The heterogeneous network built by the experimental platform completely uses the visible light communication system,and its heterogeneity is mainly reflected in the multi-layer physical level of the optical network,which is rare in all previous studies at home and abroad.The experimental platform can realize the indoor visible light communication transmission of video stream data and the receiving end mobile switching function,and also has the receiving end computer user interface.When the transmitting end PC sends the video stream data,and sends the data through any AP in the form of visible light,the receiving end receives the data,and the receiving end PC can play the video stream data in the form of video Display and point out the source of the data.The platform can simulate the handover process caused by the user's movement,during which the data transmission is not interrupted,and the data connection is maintained all the time.