Visible light communication system

A technology of visible light communication and driving signal, which is applied in the field of visible light communication, can solve problems such as signal distortion, and achieve the effect of avoiding too large or too small driving current

Inactive Publication Date: 2014-09-03
THE PLA INFORMATION ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the above technical problems, an embodiment of the present invention provides a visible light communication system to solve the signal distortion phenomenon existing in the process of using LED to realize communication

Method used

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Embodiment Construction

[0023] As mentioned in the background art section, in the prior art, there is a phenomenon of signal distortion in the process of using LEDs to realize communication.

[0024] The inventor found that this is due to the fact that the relationship between the input and output of the LED presents nonlinear characteristics. Take the actual LED (OSRAM, SFH4230) as an example, such as figure 1 as shown, figure 1 A schematic diagram of the relationship between LED voltage and current is shown in . From figure 1 It can be seen that the quasi-linear range of the LED is very limited. Once the amplitude of the input signal is too large, it will cause saturation distortion, and once the amplitude is too small, it will cause cut-off distortion, that is, the current or voltage at both ends of the LED cannot be too large or too high. Small, only when the voltage at both ends is within a limited range, can it work normally, otherwise it will cause very serious distortion, or even fail to w...

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Abstract

The invention discloses a visible light communication system. The visible light communication system comprises an LED illumination device, a driving circuit and a plurality of transmission branches, wherein the driving circuit is used for providing a driving signal to the LED illumination device; the driving circuit comprises a plurality of driving units; the plurality of transmission branches are connected with the driving circuit and the LED illumination device; the transmission branches correspond to the driving units one by one; the phase difference between at least two phases in driving signals output by each driving unit is (0, 2pi) and does not comprise an endpoint value, namely the driving signals output by each driving unit are completely different so that the phenomenon that current in all the transmission branches reaches the peak value at the same time is avoided when the driving signals are provided to the LED illumination device by using the driving circuit, and furthermore, the phenomenon that the driving current of the LED illumination device is too great or too small is effectively avoided; a signal distortion phenomenon in a process of realizing communication by using an LED is solved.

Description

technical field [0001] The present invention relates to the technical field of visible light communication, in particular to a visible light communication system. Background technique [0002] Visible Light Communication technology (Visible Light Communication, VLC) refers to the use of light in the visible light band as an information carrier, without using optical fiber and other wired channel transmission media, and directly transmits optical signals in the air. Compared with other wireless communication technologies (such as radio frequency communication technology and infrared communication technology), the development time of visible light wireless communication technology is relatively short, and there are still many problems to be solved. In the prior art, LEDs are mainly used to realize communication, so as to improve the transmission quality of communication. However, in the prior art, in the process of using LEDs to realize communication, signal distortion genera...

Claims

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Application Information

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IPC IPC(8): H04B10/116H05B37/02
Inventor 刘洛琨曾福来邬江兴于宏毅张效义张剑朱义君汪涛付红双
Owner THE PLA INFORMATION ENG UNIV
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