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A dimming device and a dimming control method thereof in a visible light communication system

A technology of visible light communication and dimming device, applied in transmission systems, digital transmission systems, short-range systems, etc., can solve the problems of reduced transmission efficiency of VLC systems, and achieve the effects of improving transmission efficiency, improving transmission efficiency, and reliable communication.

Active Publication Date: 2021-07-02
NORTHWEST UNIVERSITY FOR NATIONALITIES
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Problems solved by technology

However, since a large number of compensation symbols need to be inserted in order to realize the set dimming value (especially when the dimming value is large or small), this dimming control method will greatly reduce the transmission efficiency of the VLC system

Method used

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  • A dimming device and a dimming control method thereof in a visible light communication system
  • A dimming device and a dimming control method thereof in a visible light communication system
  • A dimming device and a dimming control method thereof in a visible light communication system

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Embodiment Construction

[0042] In order to make the content of the present invention clearly understood, the present invention will be further described in detail below based on specific examples and in conjunction with the accompanying drawings.

[0043] In the visible light communication system, light-emitting diodes (LEDs) must realize the lighting function on the one hand, and the communication function on the other hand. In the visible light communication system, dimming is to change the luminous brightness of the LED so that the luminous brightness of the LED conforms to the actual set brightness value. However, after the information data is channel coded, the proportion of the "1" code and the "0" code is changing all the time, which causes the LED to appear bright and dark flickering. Therefore, dimming control is required.

[0044] A dimming device in a visible light communication system is composed of a transmitter and a receiver, such as figure 1 shown. in:

[0045] Transmitter include...

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Abstract

A dimming device in a visible light communication system is composed of a transmitter and a receiver. The transmitter includes: an FEC encoder, a CRC encoder, a dimming encoder, an OOK modulator, and a light-emitting diode LED; the receiver includes: Photodetector, OOK demodulator, dimming decoder, CRC detector, FEC decoder. In the process of dimming realization, first divide each parity block into several lengths M The syndrome block, and then in order to get the dimming value, each length is M The syndrome block dimming code of length is N The dimming sub-block, where, N The value of must be satisfied. The present invention combines FEC channel coding and dimming control, so that the VLC system can realize reliable communication on the one hand, and dimming control of LEDs on the other hand, so as to meet the actual lighting requirements. At the same time, due to the adoption of dimming coding, It greatly improves and improves the transmission efficiency of information data in the VLC system.

Description

technical field [0001] The invention relates to a dimming device in a visible light communication system and a dimming control method thereof, and belongs to the related technical fields of visible light communication systems, dimming control, data encoding and decoding, and the like. Background technique [0002] With the rapid development of wireless communication technology and the continuous upgrading of mobile communication networks, radio spectrum has become an increasingly scarce resource. In this context, Optical Wireless Communication (OWC) stands out as an important means to solve this problem. In recent years, with the rapid development of LED technology and its widespread use, the visible light communication (Visible Light Communication, VLC) system, which uses LEDs to realize communication, has become the main means of optical wireless communication. Since the VLC system uses visible light as the carrier of information transmission, the VLC system has advantage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116H04L1/00
CPCH04B10/116H04L1/0041H04L1/0045H04L1/0061
Inventor 邓克岩万毅
Owner NORTHWEST UNIVERSITY FOR NATIONALITIES
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