臺灣博碩士論文加值系統

差分混沌位移鍵控(DCSK)為非同調通訊系統，調變與解調變技術其主要特點是利用混沌訊號作為載波方式。由於混沌系統本身具有多頻率的特性，因此在無線通訊中，多路徑衰減的傳送下，具有更好性能的發展。為了改善混沌通訊系統的整體的性能，提升以DCSK為基礎通訊系統。尤其在AWGN、離散非時變通道及無線多路徑時變通道的衰減情況下進行性能模擬與分析，本論文並提出以適應性通道等化器及通道迴旋編碼最大相似解碼方式來補償通道衰減及雜訊干擾，用以達成性能提升的目的。
在論文中均對所推得的理論做一數值上的模擬並驗證所推理論的可行性，最後以數位影像通過所設計的系統，模擬獲得一系統化方式來分析系統性能在不同環境下的差異，做為未來數位通訊應用的參考。

DCSK is a non-coherent modulation and demodulation technique which is designed by using the chaotic signal as the carrier. Due to the characteristic of multi-frequency of chaotic communication, a good performance of multi-path-fading is expected for wireless communication. In order to obtain the good performance of chaotic communication system in time-invariant channel and time-variant channel, the thesis is to presented an adaptive channel equalizer and a technique of channel coding to overcome channel effect and noise especially AWGN.
In this thesis, we not only apply the numerical simulation to demonstrate proposed results but also transmit a some digital images and voices in different communication systems to verify performance is satisfying in different environments.

中文摘要 I
英文摘要 II
誌謝 Ⅳ
目錄 V
表目錄 Ⅷ
圖目錄 Ⅸ
第一章 緒論 1
1.1 相關文獻及背景 1
1.2 研究動機及目的 2
1.3 論文概述 3
第二章 以差動混沌位移鍵控為基礎之數位通信系統 5
2.1 簡介 5
2.2 混沌系統 6
2.3 混沌通訊系統架構 7
2.4 混沌位移鍵控 9
2.4.1 CSK調變 10
2.4.2 CSK解調變 11
2.5 DCSK調變系統 12
2.5.1 DCSK調變 12
2.5.2 DCSK解調變 14
2.5.3 DCSK 的誤碼率 15
2.6 模擬與結果 16
第三章 通道架構及特性 18
3.1 簡介 18
3.2 離散時間非時變通道 19
3.3 無線多路徑時變的通道 21
3.3.1 無線訊號傳播路徑 21
3.3.1.1 路徑損失(Path Loss) 22
3.3.1.2 衰減(Fading) 23
3.3.1.2.1 緩慢衰減(Slow Fading) 24
3.3.1.2.2 快速衰減(Fast Fading) 24
3.3.1.2.3 都普勒擴散(Doppler spread) 25
3.4 Jakes衰減通道模型 27
3.4.1 Jakes衰減模型 27
3.4.2 改良式Jakes模型 29
3.5 GSM傳播模型 30
3.6 模擬與結果 32
第四章 通道等化器技術 37
4.1 簡介 37
4.2 等化器的基礎 37
4.2.1 等化器原理 38
4.2.2 適應性等化器 39
4.3 最小均方(LMS)通道等化器 43
4.4 最大相似估測器(Maximum likelihood estimator) 44
4.5 模擬與結果 48
第五章 通道編碼技術 52
5.1 簡介 52
5.2 迴旋編碼 53
5.2.1 編碼原理 54
5.2.2 編碼樹、格子圖與狀態圖 57
5.2.2.1 編碼樹(coding tree) 57
5.2.2.2 格子圖(Trellis diagrams) 59
5.2.2.3 狀態圖(state diagrams) 60
5.3 交錯器(Interleaver) 62
5.4 最大相似迴旋解碼 64
5.5 模擬與結果 66
第六章 實驗結果與結論 70
6.1 實驗結果 70
6.1.1 使用線性等化器(LE)、最大相似估測器(MLSE)、迴旋編解碼
(ECC)與MLSE結合ECC在DCSK系統受到通道衰減的性能
比較 70
6.1.2 傳統BPSK與DCSK對於通道衰減的性能比較 72
6.1.3 實際傳送影像 74
6.2 結論與未來展望 93
6.2.1 結論 93
6.2.2 未來展望 93
參考文獻 95

[1]W. M. Tam, F. C. M. Lau, and C. K. Tse, “Analysis of Bit Error Rates for Multiple Access CSK and DCSK Communication Systems,” IEEE Trans. Circuits Syst., vol. 50, pp.702-707, 2003.
[2]A. Volkovskii, ”Synchronization of chaotic systems using phase control,” IEEE Trans. Circuits Sys., vol.44, pp.913-917, 1997.
[3]W. M. Tam, F. C. M. Lau, C. K. Tse, and M. M. Yip, “An Approach to Calculation the Bit-Error Rate of a Coherent Chaos-Shift-Keying Digital Communication System Under a Noisy Multiuser Environment,” IEEE Trans. Circuits Syst., vol. 49, pp.210-223, 2002.
[4]M. P. Kennedy, G. Kolumbán, G. Kis, and Z. Jákó, “Performance Evaluation of FM-DCSK Modulation in Multipath Environments,” IEEE Transactions On Circuits And Systems —I: Fundamental Theory And Applications, vol. 47, no. 12, Dec. 2000
[5]S. Lin and D. J. Costello, JR. “Error Control Coding: Fundamentals and Application,” Englewood Cliffs, N.J., Prentice-Hall, 1983.
[6]J. G.. Proakis, M. Salehi and G. Bauch., “Contemporary Communication Systems Using MATLAB and Simulink” Thomson Brooks/Core, Second Edition, pp.885-902, 2004.
[7]Y. Xiat, L. Wang, G. Chen, “Adaptability between FM-DCSK and Channel Coding over Fading Channels,” Microwave, Antenna, Propaqation and EMC Technologies for Wireless Communication, 2005. MAPE 2005. IEEE international Symposium on, vol. 2, 08-12 Aug. Page(s):1025 – 1029 2005
[8]黃俊鑫, “多用戶混沌數位通訊之研究,” 國立雲林科技大學, 碩士論文, 2004
[9]曾繁浩, “數位渾沌通訊系統的性能評估與模擬,” 國立雲林科技大學, 碩士論文, 2004
[10] M. P. Kennedy, R. Rovatti, and G. Setti, “Chaotic Electronics in Telecommunications,” CRC Press, 2000.
[11]J. G.. Proakis, ”Digital Communications,”4rd ed, McGraw Hill,2001
[12]G. Kolumbán, M. P. Kennedy, and L. O. Chua, “The role of synchronization in digital communication using chaos－Part I: Fundamentals of digital communication,” IEEE Trans. Circuits Syst. I, vol. 44, pp.927-936, 1997.
[13]P. Dent, G. E. Bottomley and T. Croft, ”Jakes Fading Model Revisited, ” ELECTRONICS LETTERS vol. 29, No. 13, June, 1993
[14]W. C. Jakes, “Microwave Mobile Communication,” John Wiley, New York, 1974
[15]R. Steele, “Mobile radio communications,” Pentech Press, 1992
[16]Y. Li, Y. L. Guan, ”Modified Jakes’ Model for Simulating Multiple Uncorrelated Fading Waveforms, ” Vehicular Technology Conference Proceedings, 2000. VTC 2000-spring Tokyo. 2000 IEEE 51st
[17]S. Haykin, “Adaptive Filter Theory,” Englewood Cliffs, NJ: Prentice-Hill, 2nd ed, 1991.
[18]F. R. Magee and J. G. Proakis, “Adaptive maximum likelihood sequence estimation for digital signaling in the presence of intersymbol interference,” IEEE Trans. Inf. Theory, vol. IT-19, no. 1, pp. 120-124, 1973.
[19]S. Haykin, “Communication Systems,” 4rd ed., John Wiley & Sons, 2000.
[20]S. Lin and D. J. Costello, JR. “Error Control Coding: Fundamentals and Application,” Englewood Cliffs, N.J., Prentice-Hall, 1983.
[21]J. B. Anderson, “Trellis and Turbo coding,” Wiley Inter-science, 2004
[22]G. D. Forney, “Maximum likelihood sequence estimation of digital sequences in the presence of intersymbol interference,” IEEE Trans. Inform, Theory, vol. IT-18, no. 3, pp. 363-378, 1972
[23]G. Kolumbán, M. P. Kennedy, and L. O. Chua, “The role of synchronization in digital communication using chaos－Part II: Chaotic modulation and chaotic synchronization,” IEEE Trans. Circuits Syst. I, vol. 45, pp.1129-1140, 1998.
[24]W. M. Tam, F. C. M. Lau, C. K. Tse, and M. M. Yip, “An Approach to Calculation the Bit-Error Rate of a Coherent Chaos-Shift-Keying Digital Communication System Under a Noisy Multiuser Environment,” IEEE Trans. Circuits Syst., vol. 49, pp.210-223, 2002.
[25]W. M. Tam, F. C. M. Lau, and C. K. Tse, “A Multiple Access Scheme for Chaos-Based Digital Communication System Utilizing Transmitted Reference”, IEEE Trans. Circuits Syst., vol. 51, 2004.
[26]B. SKLAR, “DIGITAL COMMUNICATIONS Fundamentals and Applications” Prentice-Hall International, Inc. Second Edition, pp. 167-235, 2001.
[27]“Communications Toolbox for Use with MATLAB,” http://www.mathworks.com, Oct. 2004 Revised for Version 3.0.1