Research On The Localization Technologies And Applications For Indoor Cellular Visible Light Communication Network

In the current indoor communication network environment,it is very important to obtain the location of the user.On the one hand,the location information helps to determine the content of the network service.On the other hand,the location information is conducive to the optimization of the overall network performance.With the popularization of white light-emitting diode(LED)as indoor lighting equipment and the development of Visible Light Communication(VLC),the applications of indoor visible light communication network are more and more worth looking forward to.In order to achieve uniform indoor lighting brightness requirements,indoor visible light communication often requires the use of multiple light sources,which constitutes the indoor cellular visible light network.In an indoor cellular visible light network environment,getting the user's location is crucial in order to aggregate and distribute user information in different cells.Indoor cellular visible light network location will face many problems,such as multi-light source signals will form an overlapping area interfere with each other,the emergence of the optical path occlusion and the user's position movement affect the optical signal reception.How to overcome these problems to determine the location is the hotspot in the field of visible light communication.Therefore,this paper studies the problem of precise positioning in indoor cellular visible light communication network and proposes two positioning schemes,and also studies the application of positioning.The innovative work of this paper mainly includes the following three aspects:·Proposes a visible light positioning scheme based on color space intensity distribution.The existing visible light positioning schemes mainly use the information of distance,angle and attenuation between the sending end and the sending end to determine the position,and do not consider the visible light's own coloir characteristics.The program from the environmental division of the region and the light source distribution,the use of red,green and blue LED lights,take one of the colors used to determine the region,the other two colors in the region perpendicular to the direction of a certain linear gradient,building with strength distribution of the law of the color space,through the color space of the light intensity information is mapped to the location of information in the indoor environment to achieve rapid and convenient positioning of visible light.The solution enables positioning within the area by measuring off-line data of six feature points,making it ideal for indoor visible cellular network environments.· Proposes a visible light positioning scheme based on movement collaboration.Indoor environment has its own limitations of the environment and the movement of people and objects,visible light cellular network will inevitably occlusion problems,greatly affecting the positioning accuracy of visible light positioning.This solution utilizes the proven motion sensor on current mobile devices to achieve coordinated visible light position determination.By comparing the influence of acceleration,angular velocity and motion parameters on the positioning results of the program,we have determined the positioning scheme to determine the direction of motion based on the parameters of the actual motion distance,acceleration and angular velocity parameters,effectively completing the visible light signal in the indoor visible light cellular network continuous position determination with instantaneous occlusion occurs.· Builds an indoor visible light cellular network experimental platform.The experimental platform uses the visible light uplink and downlink to build the indoor cellular visible light communication network environment.Based on this,a series of functions such as network access,location determination,zone switching and real-time monitoring are implemented.I am responsible for the architecture and design and development of the platform software,such as the network management interface and control signaling,and the functional verification of the two positioning methods.In practical applications,the visible light cellular network environment in which each terminal is located is not independent from each other,and data transmission is also required between these regions.Therefore,a heterogeneous wireless optical network communication architecture is also proposed in this paper,which realizes indoor cellular visible light communication between networks,improve the integrity of the full text of the study.