Research On Visible Light Localization Optimization Method Based On Received Signal Strength Algorithm

Visible light communication(VLC)is a new communication technology,which is more and more important in our daily life.It has advantages such as do not occupy public bandwidth,good isolation,high security and so on.At present,visible light indoor positing technology is a research hotspot in VLC systems.In the text,we focused on the optimization of the indoor LED system,the location of the base station,and the design of a system with a high signal-to-noise ratio under uniform light conditions.The main work of this article includes:(1)The plan of indoor visible light positing has been designed.The core device selection,base station overall layout strategy,base station and receiver angles,and DC channel gain calculations are described.We propose an equilateral triangle distribution base station optimization model and prove it theoretically.Combining the Kalman filtering method with the RSS algorithm to solve the indoor movingtarget positioning problem,and discussing the influence of the positioning accuracy of the node to be measured when it is in the edge of the room.The simulation results show that the positioning accuracy of the indoor visible light positioning scheme in this paper reaches3.4cm under the condition of using equilateral triangle base station layout and using Kalman filtering algorithm to process signals.(2)We approximate the LED light intensity distribution as Lambertian light source,and calculate the maximum distance of adjacent LED lights when obtaining a uniform light intensity at a specified height.Under the condition of ensuring uniform illumination,the time division multiplexing(TDM)mechanism is introduced into the indoor visible light positioning model.The simulation results show that compared with the original model,the TDM model has significantly improved from the light intensity ratio to the signal-to-noise ratio,and the signal-to-noise ratio reaches 1.34 dB.Then through Lambertian light source selection,choose more suitable light source to join the system,so that the signal to noise ratio of3.85 dB in simulation.(3)We propose to divide the LED light source array into a design scheme in which a communication node and a lighting node coexist,and perform analysis and calculation of the light intensity ratio and the signal-to-noise ratio of the indoor visible light positioning systemcommunication system.The simulation results show that the signal-to-noise ratio of the positioning system is not less than 16 dB under the condition of a half-power angle of 15° and an LED light source spacing of 4m or more,which can meet the communication requirements of the visible light indoor positioning system.