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Visible light communication system based on FSK modulation and power line carrier

A technology of visible light communication and power line carrier, applied in distribution line transmission system, short-range system, free space transmission, etc., can solve the problems of tight spectrum resources, limited transmission distance, low security, etc., to reduce construction costs , The effect of improving the transmission rate and high security

Inactive Publication Date: 2015-10-14
BEIJING OPTECH TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Radio frequency technology has a wide and irreplaceable role in the field of wireless communication, but its shortcomings are becoming more and more prominent, such as the shortage of spectrum resources, electromagnetic interference, harm to human body, low safety, limited transmission distance, etc.

Method used

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  • Visible light communication system based on FSK modulation and power line carrier
  • Visible light communication system based on FSK modulation and power line carrier
  • Visible light communication system based on FSK modulation and power line carrier

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Embodiment Construction

[0035] Embodiments of the present invention will be described below with reference to the accompanying drawings. Elements and features described in one figure or embodiment of the invention may be combined with elements and features shown in one or more other figures or embodiments. It should be noted that representations and descriptions of components and processes known to those of ordinary skill in the art that are unrelated to the present invention are omitted from the drawings and description for the purpose of clarity.

[0036] figure 1 This is a schematic diagram of the system structure of an embodiment of the visible light communication system based on FSK modulation and power line carrier of the present invention.

[0037] like figure 1 As shown, in this embodiment, the visible light communication system based on FSK modulation and power line carrier of the present invention includes:

[0038] a signal preprocessing module 10, for converting the received signal int...

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Abstract

The invention provides a visible light communication system based on FSK modulation and a power line carrier. The visible light communication system comprises the components of a signal preprocessing module which is used for converting a signal to a first digital signal and outputting; a power line carrier communication module which is connected with the signal preprocessing module and is used for receiving the first digital signal and performing FSK modulation for obtaining a first modulated signal and coupling with a power line for transmission; a converting module which is connected with the power line and is used for converting an AC signal to a DC signal, obtains a second modulated signal through adding the DC signal with the first modulated signal that is separated from the power line and outputs the second modulated signal; and a visible light communication module which comprises an LED light source, a photoelectric detector and a signal demodulating unit; wherein the LED light source is connected with the converting module and loads the second modulated signal for transmitting an optical signal; the photoelectric detector receives the optical signal and converts the optical signal to an electric signal; and the signal demodulating unit performs amplification, filtering and demodulation on the electric signal for obtaining a second digital signal. The visible light communication system has advantages of no electromagnetic interference, no spectrum limitation, wide application range, etc.

Description

technical field [0001] The invention relates to the technical field of power line carrier communication and visible light communication, in particular to a visible light communication system based on FSK modulation and power line carrier. Background technique [0002] Power Line Communication (PLC for short) is a communication method unique to the power system that uses the power frequency power transmission line as the transmission medium. The power line network is the largest wired network in the world. No additional wiring is required. Any communication device connected to it can be accessed through the power line, making PLC more and more widely used in smart home systems. [0003] Radio frequency technology has a broad and irreplaceable role in the field of wireless communication, but its shortcomings are becoming more and more prominent, such as tight spectrum resources, electromagnetic interference, harm to human body, low security, limited transmission distance and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04B3/54
Inventor 刘鹏武学颖张海玉
Owner BEIJING OPTECH TECH
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