Visible Light Communication Source Layout And Heterogeneous Network Switching Algorithm Research

The 21st century is the information technology and communication technology, high speed development of the Internet age. Internet technology greatly enriched the every aspect of human life, especially the rapid development of modern wireless communication technology makes people more convenient and quick access to the vast amounts of information.Due to the rapid growth of the wireless network traffic demand, the existing wireless networks due to such problems as shortage of spectrum resources, make wireless network capacity improvement is difficult to meet the needs of the business of blowout increased.So, the visible light communication technology is expected to make up for the defects.Visible light communication is a new kind of indoor wireless access technology, compared with the traditional wireless access technologies, is rich of available spectrum resources, low energy consumption, strong confidentiality, and many other advantages.At the same time, the visible light communication, has the function of both illumination and communications, is a kind of wide application prospect of indoor means of communication.In this paper, the research on the key technology of visible light communication network, mainly studies the lighting layout optimization, network switch technology and access to technology.Working content summarized as follows:First, in the typical indoor visible light network, each access point (leds) visible light range between 3-5 square metre only, coverage is very limited.In order to meet the requirements of indoor lighting and mobile users is not limited, you need to deploy multiple leds access point, namely the rationally designed according to the shape and size of the room LED lights, and on the basis of adjust the transmission power of LED lamp, in order to achieve the best communication quality.Towards the interior space of non-ideal scenarios, the ground plane is a rectangle the three-dimensional space of the layout of the light source, proposed to rectangular plane modeling for elliptical modeling ideas, and study its source layout plan, research has shown that using the proposed model as well as the light source layout scheme, can effectively guarantee the quality of interior space coverage and communication.Second, in the visible light communication in heterogeneous network, in order to ensure that users get smooth service, for in a heterogeneous network environment of multi-user access switch and problems, this paper put forward a kind of guarantee system for the first time in more than one user service with high efficiency, the system all nodes within the service time to minimize the time optimal switching algorithm.