title page
Abstract
Contents
List of Abbreviations 15
1. Introduction 16
1.1. Chaotic signal 16
1.2. WPAN(Wireless Personal Area Networks) 20
1.3. IEEE 802.15.4a channel[9] 22
1.4. Technology Tree 23
2. Performance Analysis of Chaotic Modulations and Enhanced Chaotic Modulation 25
2.1. Problem of conventional modulations and proposal 25
2.2. DCSK(Differential Chaos Shift Keying) 25
2.2.1 Performance analysis on AWGN channel 26
2.2.2 Simulation results 29
2.2.3 DCSK system with guard interval 30
2.2.4 RD(Reduced Delay) - DCSK 35
2.3. COOK(Chaotic On-Off Keying) 43
2.3.1. Performance analysis on AWGN channel 44
2.3.2. Simulation results 47
2.3.3. COOK system with guard interval 48
2.3.4. Simulation results 50
2.4. PPB-CM(Pulse Position Based-Chaotic Modulation) 52
2.4.1. PPB-CM Modulation 52
2.4.2. Simulation results 53
3. IGI(Intra Guard Interval) Systems 56
3.1. Problem of conventional modulations and proposal 56
3.2. IGI DCSK system 56
3.2.1. Performance analysis on AWGN channel 56
3.2.2. Simulation results 59
3.3. IGI PPB-CM system 61
3.3.1. Simulation results 61
4. Preamble Design and Packet Detection in IEEE 802.15.4a system 65
4.1. Problem of conventional systems and proposal 65
4.2. Preamble design 65
4.3. Packet detection algorithm 66
4.3.1. Single sliding window packet detection[13] 66
4.3.2. Double sliding window packet detection 67
4.3.3. Packet detection on AWGN channel 68
4.3.4. Detection error probability 70
4.3.5. Packet detection in IEEE 802.15.4a channel 71
5. Summary and Conclusions 75
[국문요약] 77
References 79
Acknowledgement 81
Curriculum Vitae 82
1.1. Statistical properties of the normalized chaotic sequences 20
2.1. DCSK modulation merits and demerits 36
2.2. COOK modulation merits and demerits 51
2.3. PPB-CM modulation merits and demerits 54
3.1. Performance improvements in IGI DCSK system 61
3.2. Performance improvements in IGI PPB-CM system 63
1.1. Evolution of two nearby orbits in phase space 17
1.2. Technology Tree 23
2.1. DCSK signal 25
2.2. DCSK Block Diagram 26
2.3. DCSK Receiver Principle 26
2.4. DCSK performance on AWGN channel 30
2.5. DCSK performance with varying spreading gain 31
2.6. IEEE 802.15.4a impulse response 32
2.7. DCSK IEEE 802.15.4a channel performance 33
2.8. DCSK with Guard Interval pulse shape 34
2.9. DCSK with Guard Interval AWGN channel performance 35
2.10. RD - DCSK block diagram 36
2.11. RD - DCSK signal waveform 37
2.12. RD - DCSK on AWGN channel performance with hard decision method 40
2.13. RD - DCSK AWGN channel performance in different M number 41
2.14. RD - DCSK on AWGN channel performance with soft decision method 44
2.15. COOK Block diagram 44
2.16. COOK Symbol Energy Histogram 46
2.17. COOK AWGN channel performance 47
2.18. COOK IEEE 802.15.4a channel performance 48
2.19. COOK Block Diagram with Guard Interval 49
2.20. COOK with guard interval on AWGN channel performance 51
2.21. COOK with guard interval IEEE 802.15.4a channel performance 52
2.22. COOK AWGN channel performance with different thresholds 53
2.23. PPB-CM system block diagram 53
2.24. PPB-CM signal shape 54
2.25. PPB-CM AWGN channel performance 55
2.26. PPB-CM IEEE 802.15.4a channel performance 55
3.1. IGI DCSK signal shape 57
3.2. IGI DCSK performance on AWGN channel 60
3.3. DCSK signal shape in IEEE 802.15.4a channel 61
3.4. IGI DCSK channel performance in IEEE 802.15.4a channel 62
3.5. IGI PPB-CM signal shape 63
3.6. PPB-CM signal shape in IEEE 802.15.4a channel 63
3.7. IGI PPB-CM performance in IEEE 802.15.4a channel 64
4.1. IEEE 802.15.4a Preamble 65
4.2. Output of single sliding window 66
4.3. Output of double sliding window 67
4.4. Output of single sliding window 69
4.5. Output of double sliding window at 16dB 70
4.6. Output of double sliding window at 24dB 71
4.7. Output of double sliding window at 16~24dB 72
4.8. Defection error rate on AWGN channel 72
4.9. IEEE 802.15.4a impulse response 73
4.10. preamble response in multipath channel 73
4.11. Double sliding window output in Eb/N0=16dB(이미지참조) 74
4.12. Double sliding window output in Eb/N0=24dB(이미지참조) 74