CHAPTER 1. INTRODUCTION 1
1.1 Background and Motivation 1
1.2 Thesis Organization 5
CHAPTER 2. RELATED WORK 6
2.1 Health Monitoring Devices 6
2.2 Time Synchronization 7
2.2.1 Reference Broadcast Synchronization 8
2.2.2 Timing-sync Protocol for Sensor Networks 8
2.2.3 Flooding Time Synchronization Protocol 9
CHAPTER 3. DESIGN AND IMPLEMENTATION 10
3.1 Overview 10
3.2 Hardware Architecture 11
3.2.1 Microcontroller Module 11
3.2.2 Sensor Module 12
3.3 Software Architecture 13
3.3.1 MAC Protocol 13
3.3.2 Packet Format 14
3.3.3 Packet Retransmission 15
3.3.4 Time Synchronization 19
3.3.5 User Interface 23
CHAPTER 4. EXPERIMENT AND EVALUATION 26
4.1 Retransmission Policy 26
4.2 Real-World Experiment 26
4.2.1 Experimental Setup 26
4.2.2 Overall Experimental Results 27
4.2.3 Statistic of Packets 28
4.2.4 Effect of Moving Subjects on PRR 30
4.2.5 Throughput 31
4.3 Existing MAC Protocol Comparison 32
4.4 Time Synchronization 33
4.5 Power Consumption 36
4.6 Signal Demonstration 37
CHAPTER 5. DISCUSSION 40
CHAPTER 6. CONCLUSION AND FUTURE WORK 42
REFERENCES 44
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