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A visible light communication front-end circuit

A technology for visible light communication and front-end circuits, applied in the field of visible light communication, can solve the problems of impedance mismatch and high cost of visible light circuits, and achieve the effects of low circuit cost, high modulation depth, and improved information bandwidth

Active Publication Date: 2016-06-01
THE PLA INFORMATION ENG UNIV
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  • Abstract
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Problems solved by technology

[0005] In view of this, the present invention provides a visible light communication front-end circuit to overcome the problems of high cost and impedance mismatch of visible light circuits in the prior art

Method used

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  • A visible light communication front-end circuit
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  • A visible light communication front-end circuit

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Embodiment Construction

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0027] The present invention provides a visible light communication front-end circuit, including: a front-end transmitting circuit and a front-end receiving circuit. Wherein, the front-end transmitting circuit is used for AC coupling and amplifying the first digital signal generated by the signal source to generate the first current signal, so as to make the LED work in the linear region. The front-end receiving circuit is used to convert the light signal gene...

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Abstract

The invention provides a visible light communication front end circuit which comprises a front end transmitting circuit and a front end receiving circuit. The front end transmitting circuit is used for carrying out alternating-current coupling on a first digital signal produced by a signal source and amplifying the first digital signal so that a first current signal can be generated and an LED can work in a linear region. The front end receiving circuit is used for converting an optical signal produced by the LED into a current signal and converting the current signal into a voltage signal so that a second digital signal corresponding to the first digital signal can be generated after lowpass filtering and gain amplification are carried out. According to the visible light communication front end circuit, a bias-T-type biasing circuit module does not need to be used, and circuit cost is low. The front end transmitting circuit can provide controllable direct-current bias for an LED lamp bank by means of variable resistors in a coupling mode, so that the LED can provide brightness needed by illumination and the modulation depth of an input signal can be high.

Description

technical field [0001] The present invention relates to the technical field of visible light communication, and more specifically, relates to a visible light communication front-end circuit. Background technique [0002] In recent years, with the gradual rise of visible light communication technology, more and more scientific research institutions are researching it. Usually, from theoretical application to practice, visible light communication needs to solve the problem of analog front-end circuit implementation. [0003] At present, the existing technology is to use the bias-T type bias circuit module and the amplifier circuit module in conjunction with the sending end to meet the current required for the LED to provide lighting, and to make the LED in a good linear working state to ensure signal integrity. [0004] However, the above-mentioned modules are expensive, have high power supply voltage requirements, and are not easy to miniaturize. In addition, the inventors...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/40
Inventor 邬江兴于宏毅朱义君张剑田忠俊
Owner THE PLA INFORMATION ENG UNIV
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