Visible light communication networking structure and method based on NLOS link
A visible light communication, non-line-of-sight technology, applied in the field of visible light communication, can solve problems such as the inability to realize line-of-sight links
Active Publication Date: 2014-06-04
TSINGHUA UNIV
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Problems solved by technology
However, the line-of-sight link based on lighting can provide a top-down communication link, but it cannot realize a top-down line-of-sight link. This is also a problem in the current visible light communication. How to realize the uplink of communication
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[0023] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples.
[0024] like figure 1 shown,
[0025] The application scenarios of the present invention are normal indoor lighting scenarios, such as indoor corridors, mines, museums and other places. In such scenarios, in order to meet the lighting requirements, the light of the LED lighting lamp is illuminated downward, so there is a certain distance between the two lamps. Do not receive direct light from each other. In addition, the receiving angle of the photodetector arranged on the LED lighting can be adjusted so that it can only receive the reflection path of other LED lighting.
[0026] In order to adapt to the visible light communication in the above scenarios, the present invention first proposes a corresponding structure, including several LED lighting lamps, such as figure 1 As shown, a photodetector, an amplifier, an information processi...
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A visible light communication networking structure based on an NLOS link comprises a plurality of LED floodlights. Each LED floodlight is provided with a photoelectric detector, an amplifier, an information processing module and a driving module, wherein each photoelectric detector receives light which is formed by reflecting light rays emitted by the other LED floodlights through the ground or a wall, and the light is converted into an electric signal; each amplifier amplifies the corresponding electric signal; each information processing module conducts demodulation and modulation on information carried in the corresponding amplified electric signal; each driving signal loads the corresponding modulated information to the corresponding LED floodlight and drives the corresponding LED floodlight to emit light. According to the visible light communication networking structure, the light emitted by each LED floodlight serves as an information output channel, each photoelectric detector receives the light which is formed by reflecting light rays emitted by the other LED floodlights through the ground or the wall, the received light serves as an information input channel, each LED lamp becomes a data node, and therefore networking can be conducted through the multiple LED lamps by means of NLOS visible light channels.
Description
technical field [0001] The invention belongs to the technical field of visible light communication, and particularly relates to a visible light communication networking structure and method based on a non-line-of-sight link. Background technique [0002] Due to the ubiquitous characteristics of lighting sources, lighting sources that can be used for communication can be installed anywhere to form ubiquitous coverage. LED-based visible light communication has the advantages of energy saving and environmental protection. Compared with traditional incandescent lamps, LED lighting not only has high energy efficiency, but also has an extremely long life. Its promotion will greatly reduce carbon dioxide emissions and the production of environmental pollutants. As a recognized fourth-generation lighting source, the promotion of LED lighting means that LED-based ubiquitous visible light communication will gradually enter the public's field of vision. [0003] The setting of lighti...
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IPC IPC(8): H04B10/116
Inventor 董昊张洪明
Owner TSINGHUA UNIV