Visible light communication system and LED nonlinearity analysis method on its performance
A technology of visible light communication and impact analysis, which is applied in the field of visible light communication, can solve problems such as performance that has not been studied in depth, and achieve the effects of resource saving, small impact, and simple equipment
Active Publication Date: 2017-09-22
镇江大创智能电气有限公司
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Problems solved by technology
In the voice broadcast communication system based on visible light communication, the frequency modulation (FM) method has been mentioned and applied, but the performance of the visible light communication system based on the FM modulation method has not been studied in depth, and there is no solution for LED nonlinear pairing at present. Research on the Influence of FM Modulation Mode
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[0031] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The elements and features described in one drawing or one embodiment of the present invention may be combined with the elements and features shown in one or more other drawings or embodiments. It should be noted that, for the purpose of clarity, representations and descriptions of components and processes that are not related to the present invention and known to those of ordinary skill in the art are omitted from the drawings and descriptions.
[0032] figure 1 It is a schematic structural diagram of a visible light communication system based on frequency modulation of the present invention.
[0033] Such as figure 1 As shown, in this embodiment, the visible light communication system based on frequency modulation of the present invention includes:
[0034] The FM modulation module 10 is used to convert the received first analog signal into a frequency modulation signal and ou...
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The invention provides a visible light communication system and a method for analyzing the influence of LED nonlinearity on its performance. The method includes: calculating a first carrier-to-noise ratio and a first signal-to-noise ratio of the visible light communication system according to the nonlinear relationship between the driving current of the LED light source and output optical power; Calculate the second carrier-to-noise ratio and the second signal-to-noise ratio of the visible light communication system from the theoretical linear relationship between the current and the output optical power; compare the first carrier-to-noise ratio with the second carrier-to-noise ratio, the The first signal-to-noise ratio and the second signal-to-noise ratio obtain an analysis result of the influence of LED nonlinearity on the performance of the visible light communication system. The invention has the advantages of simple equipment, easy implementation, resource saving, etc., and for the first time proposes an analysis method for the influence of LED nonlinearity on a frequency modulation (FM)-based visible light communication system, making the application of frequency modulation in the short-distance transmission of the visible light communication system easier Theoretical basis and specific performance evaluation.
Description
Technical field [0001] The invention relates to the technical field of visible light communication, in particular to a visible light communication system based on frequency modulation and a method for analyzing the effect of LED nonlinearity on its performance. Background technique [0002] In recent years, semiconductor lighting technology known as "green lighting" has developed rapidly. In particular, white light LEDs have attracted more and more attention, and they are known as the next generation of lighting sources. Visible light communication technology is a new wireless communication technology developed on this basis. White light LEDs have the advantages of long service life, environmental protection, safety, freedom from spectrum limitations, and high modulation rates. Visible light communication technology is a communication technology that uses the fast modulation characteristics of light-emitting diodes to modulate signals to LEDs for transmission. The light intensi...
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IPC IPC(8): H04B10/116H04B10/07H04B10/548
Inventor 刘鹏武学颖张海玉
Owner 镇江大创智能电气有限公司