Visible light communication system based on power line carrier with code rate self-adapted to QC-LDPC coding way and operating method of visible light communication system

A power line carrier and visible light communication technology, applied in the direction of link quality-based transmission modification, transmission system, digital transmission system, etc., can solve the problems of reducing system communication performance, failing to achieve system reliability, wasting bandwidth, etc. The effect of transmission efficiency, no spectrum usage restrictions, and improved reliability

Active Publication Date: 2016-02-17
镇江大创智能电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, due to the periodicity, continuity, randomness and variability of power line noise, the fixed code rate is not suitable for power line communication systems.
If the code rate is too large, the bandwidth will be wasted and the communication performance of the system will be reduced. If the code rate is too small, it will not meet the requirements of system reliability.

Method used

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  • Visible light communication system based on power line carrier with code rate self-adapted to QC-LDPC coding way and operating method of visible light communication system
  • Visible light communication system based on power line carrier with code rate self-adapted to QC-LDPC coding way and operating method of visible light communication system
  • Visible light communication system based on power line carrier with code rate self-adapted to QC-LDPC coding way and operating method of visible light communication system

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Experimental program
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Effect test

Embodiment 1

[0032] A visible light communication system based on a code rate adaptive QC-LDPC coding mode power line carrier, including sequentially connected QC-LDPC coding module, PLC communication module, intermediate transfer module, VLC communication module and QC-LDPC decoding module, The PLC communication module is connected to the intermediate transfer module through a power line, such as figure 1 Shown; The VLC communication module includes sequentially connected LED drivers, LEDs, photodetectors, optical power meters, amplifiers and filters, such as image 3 shown.

[0033] The QC-LDPC encoding module is used to encode the input signal, obtain a digital signal and send it to the PLC communication module, and adjust the encoding code rate according to the feedback PLC noise power and VLC receiving optical power, and convert the adjusted encoding The code rate is sent to the QC-LDPC decoding module; the PLC communication module couples the received digital signal to the power lin...

Embodiment 2

[0040] The specific steps of the above-mentioned operating method of the visible light communication system include:

[0041] (1) The QC-LDPC encoding module encodes the input signal, obtains a digital signal and sends it to the PLC communication module, and adjusts the encoding code rate according to the feedback PLC noise power and VLC receiving optical power, and adjusts the adjusted The code rate is sent to the QC-LDPC decoding module;

[0042] (2) The PLC communication module couples the received digital signal to the power line for propagation, generates a power carrier signal and sends it to the intermediate transfer module, and feeds back the PLC noise power to the QC-LDPC encoding module ;

[0043] (3) The intermediate transfer module receives the power carrier signal and loads it to the LED to drive the LED to emit light; the LED emits a light signal to the photodetector, and the photodetector receives the light signal and emits light The signal is converted into a...

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Abstract

The invention relates to a visible light communication system based on a power line carrier with the code rate self-adapted to a QC-LDPC coding way and an operating method of the visible light communication system. The visible light communication system comprises an QC-LDPC coding module, a PLC module, an intermediate switching module, a VLC module and a QC-LDPC decoding module which are connected in sequence, wherein the PLC module is connected with the intermediate switching module through a power line; the VLC module comprises an LED driver, an LED, a photoelectric detector, an optical power meter, an amplifier and a wave filter which are connected in sequence. By virtue of the QC-LDPC coding way, the reliability of the system is improved; a proper code rate is regulated through a self-adaptive way, so that the redundancy of transmitted information is reduced, the network cost is reduced, and the transmission rate is increased.

Description

technical field [0001] The invention relates to a power line carrier visible light communication system based on code rate self-adaptive QC-LDPC coding mode and an operation method thereof, belonging to the technical field of power line carrier communication and visible light communication. Background technique [0002] Power Line Communication (PLC for short) uses power frequency power transmission lines as the transmission medium, and is a unique communication method for power systems. The power line network is the largest wired network in the world. It does not require additional wiring. 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 wide and irreplaceable role in the field of wireless communication, but its shortcomings are becoming more and more prominent, such as spectrum resources shortage, electromagnetic interference, harm to human ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04B10/116
CPCH04B10/116H04L1/0002H04L1/0058
Inventor 刘彤刘鹏李芊蒴江雷雷刘江李忠禹
Owner 镇江大创智能电气有限公司
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