LED Visible Light Communication for Healthcare Information Transmission
- Alternative Title
- 헬스케어 정보 전송을 위한 LED 가시광 통신
- Abstract
- Recent advancements in solid state lighting have opened up the possibility for light emitting diodes (LED) to be used not only for illumination, but also for communications. Visible Light Communication (VLC) wireless technology using visible range LED lights is one of the latest emerging trends in today’s optical communications research field. Compared to radio frequency (RF) wireless communication technologies, VLC has the benefits of having no electromagnetic interference with electronic medical equipment, and no harmful radiation effects towards the human body, making it a suitable communication medium in RF-prohibited areas, such as hospitals or aircraft. The main goal of this research is to design and implement a VLC-LED optical wireless transceiver system prototype. This thesis describes the hardware development of the VLC transceiver modules using low cost, off-the-shelf LEDs, photodiodes and microcontrollers. The software development of the VLC system, including modulation, demodulation, signal conditioning, transmission protocol and measurement techniques are also explored and discussed. The VLC-LED system is demonstrated to wirelessly transmit and receive healthcare related information such as Health Level Seven (HL7) text messages and analog signals such as body temperature and electrocardiogram (ECG) signals. The experiment results show the successful transmission and reception of the information over the wireless optical link.
- Issued Date
- 2012
- Awarded Date
- 2012. 2
- Type
- Dissertation
- Publisher
- Pukyong National University, Graduate School, Department of Electronic Engineering
- Affiliation
- Pukyong National University, Graduate School, Department of Electronic Engineering
- Department
- 대학원 전자공학과
- Advisor
- Chung Wan Young
- Table Of Contents
- Table of Contents
List of Figures iii
List of Tables v
List of Abbreviations vi
Acknowledgement vii
Abstract viii
1.0 Introduction 1
1.1 Motivation 2
1.2 Research Objectives 3
1.3 Chapter Organization 3
2.0 Literature Review 4
2.1 Visible Light Communications (VLC) 4
2.2 Light Emitting Diode (LED) Characteristics 7
2.2.1 LED Operation 7
2.2.2 LED Advantages 8
2.3 Related Works 9
2.3.1 VLC Technology & Applications 9
2.3.2 Healthcare Information System 11
3.0 VLC System Design & Implementation 12
3.1 Optical Channel 12
3.2 Modulation & Demodulation 15
3.2.1 Modulation 15
3.2.2 Demodulation 17
3.3 VLC Transmitter 18
3.3.1 Microcontroller 18
3.3.2 Modulator 20
3.3.3 Optical Driver 23
Table of Contents
List of Figures iii
List of Tables v
List of Abbreviations vi
Acknowledgement vii
Abstract viii
1.0 Introduction 1
1.1 Motivation 2
1.2 Research Objectives 3
1.3 Chapter Organization 3
2.0 Literature Review 4
2.1 Visible Light Communications (VLC) 4
2.2 Light Emitting Diode (LED) Characteristics 7
2.2.1 LED Operation 7
2.2.2 LED Advantages 8
2.3 Related Works 9
2.3.1 VLC Technology & Applications 9
2.3.2 Healthcare Information System 11
3.0 VLC System Design & Implementation 12
3.1 Optical Channel 12
3.2 Modulation & Demodulation 15
3.2.1 Modulation 15
3.2.2 Demodulation 17
3.3 VLC Transmitter 18
3.3.1 Microcontroller 18
3.3.2 Modulator 20
3.3.3 Optical Driver 23
3.3.4 LED Emitter 24
3.4 VLC Receiver 25
3.4.1 Photodetector 25
3.4.2 Signal Conditioning 27
3.4.3 LCD Interfacing 29
3.4.4 Noise Sources 30
4.0 Communication Protocol & Software Design 32
4.1 Data Protocol & Algorithm 32
4.1.1 Transmitter 33
4.1.2 Receiver 36
4.2 System Interface 37
4.3 Data Type 39
4.3.1 HL7 Text Message 39
4.3.2 Electrocardiogram (ECG) signal 41
5.0 Experiment Results & Performance Analysis 42
5.1 Setup & Implementation 42
5.2 Link Quality Measurements 48
5.2.1 Received Optical Power & Path Loss 48
5.2.2 Bit Error Performance 51
6.0 Conclusions 53
6.1 Summary 53
6.2 Suggestions for Future Work 54
References 56
List of Publications 61
Appendix I – VLC Transmitter 62
Appendix II – VLC Receiver 63
- Degree
- Master
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