【免费】论文研究-基于LED的可见光通信实时视频传输_可见光通信视频传输

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Int. J. Communications, Network and System Sciences, 2017, 10, 58-68

http://www.scirp.org/journal/ijcns

ISSN Online: 1913-3723

ISSN Print: 1913-3715

DOI: 10.4236/ijcns.2017.108B007

August 14, 2017

Real-Time Video Transmission of Visible Light

Communication Based on LED

Mingsong Chen, Jie Guo, Xiao Xu, Minglan Liang

School of Information and Communication, Guilin University of Electronic Technology, Guilin, China

Abstract

In order to realize the video image transmission and the excellent lighting

function of the visible light communication system, a LED-

based visible light

communication method and system is proposed. Based on the field pr

grammable gate array (FPGA) hardware,

the RS channel coding is applied to

the visible light communication system. A pulse position decision algorithm is

proposed,

which is applied to the receiver of the visible light communication

system to meet the error-free decision of the signa

l. The design of the system

is based on the analog-to-digital conversion circuit,

which provides a large

signal dynamic range for the pulse position decision algorithm,

and designs

the LED driver based on the bias circuit to realize the fast broadband modul

tion of the signal. The test results show that the combined application of pulse

position decision algorithm and Reed-Solomon

codec can reduce the error of

system signal and meet the real-

time and reliable transmission of signal. The

system can display the received video in real time from the receiver,

and the

whole system communication distance up to 5 m.

Keywords

Visible Light Communication, LED, Reed-Solomon, Pulse Position Decision

Video Transmission

1. Introduction

This template, created in MS Word 2007, provides authors with most of the

formatting With the LED equipment and craft work updating, visible light

communication based on LED technology is becoming a key research direction

of wireless optical communication [1]. The previous studies focus on the simula-

tion of modulation and coding, as well as the conceptual experimental demon-

stration, the purposes are to achieve fast and strong anti-interference ability of

VLC system [2] [3]. Based on the previous research, this treatise proposes a

How to cite this paper:

Chen, M.S.,

Guo,

J.,

Xu, X. and Liang, M.L. (2017) Real-

Time

Video Transmission of Visible Light Co

munica

tion Based on LED.

Int. J. Comm

nications

Network and System Sciences

, 58-68.

https://doi.org/10.4236/ijcns.2017.108B007

Received:

April 19, 2017

Accepted:

August 11, 2017

Published:

August 14, 2017

M. S. Chen et al.

pulse position decision algorithm and combines the RS coding method to im-

prove the reliability and effectiveness of VLC system, which both based on

FPGA to realize. At the same time, the driver circuit of LED and amplifying cir-

cuit are designed, the real-time video is processed in this paper, finally at the re-

ceiving end can display the monitors information from the transmitting end.

The dual functions of visible light communication system about lighting and

communication both realized in this paper.

2. Transmitter Design

Through the real-time video acquisition, the analog video signal is converted

into digital signal, the signal processing is mainly completed on the FPGA plat-

form, STM32 as the main control device. The camera collects real-time video

information, and converts it into digital component by analog-digital composite

video decoder (TW2867). The decoder integrates anti aliasing filter and COMS

analog to digital converter, as well as the PLL can output 108 MHz clock, pro-

grammable tone, saturation, sharpness and other parameters. The transmitter

achieves the function of video acquisition and conversion. Principle diagram of

the transmitting terminal is as shown in

Figure 1.

2.1. Signal Processing of Transmitter

RS encoding method has excellent characteristics, strong correction ability and

higher efficiency in the linear block code, the group code length is short with

good performance [4]. RS (15, 9) encoding can be used to deal with burst errors

in visible light communication. Based on the finite field GF (24), the block

length n is 15 (2

− 1), the message length k is 9, the parity length e is n-k there-

fore is 6, the maximum error correction capability t is 3, the minimum code dis-

tance d is 7.

The generate polynomial expression is:

( )

6543 2

7 9 3 12 10 12xx x x x x x

=++++ ++g

(1)

The native original polynomial expression is:

(

)

1xxx= ++p

(2)

Therefore, the resulting matrix is:

1 0 ... 0 0 (mod ( ))

0 1 ... 0 0 (mod ( ))

[]

...

0 0 ... 0 1 (mod ( ))

x gx

G Ip

x gx

−





= =







  

(3)

Coding

processing

Signal

amplification

LED

source

BIAS

driver

Camera

Video

processing

Figure 1. Principle diagram of the transmitting terminal.

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