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研究生:楊方毅
研究生(外文):Fang-Yi Yang
論文名稱:鎖幅迴路系統之共同通道頻率調變信號分離
論文名稱(外文):The Amplitude-Locked Loop System for Separating
指導教授:鐘國家鐘國家引用關係蘇德仁蘇德仁引用關係
指導教授(外文):Gwo-Jia JongTe-Jen Su
學位類別:碩士
校院名稱:國立高雄應用科技大學
系所名稱:電子與資訊工程研究所碩士班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:英文
論文頁數:61
中文關鍵詞:鎖幅迴路鎖相迴路共同通道移頻鍵分離
外文關鍵詞:Amplitude-Locked LoopPhase-Locked LoopcochannelFrequency-Shift Keyingseparation
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中文摘要
在本篇論文中發展出在調頻通訊系統中,兩個頻率調變信號彼此間產生的共同通道信號的分離模型。在分離模型中主要介紹鎖幅迴路(ALL: Amplitude-Locked Loop)系統如何在共同通道干擾信號中分離訊號,進一步提升且改進鎖相迴路( PLL: Phase-Locked Loop)的效能。本文中所介紹的高性能解調器包括鎖幅迴路和鎖相迴路兩個方塊系統。
鎖幅迴路系統可將主要(Dominant)訊號和次要訊號(Subdominant)互相分離出來。另一方面,採用新的調頻解調器技術,可以使頻寬達到雙倍的利用。同樣的技術也可以應用於數位式的移頻鍵(FSK: Frequency-Shift Keying)調變模式。因此,任何無線通訊系統可在此設計下,讓頻寬配置極盡枯竭的現在,更可以進一步獲取更多的通訊容量。因此,能夠以結合此方法來應用及改進,對於任何固定波封調頻發射系統或其它類似數位編碼架構系統的效能。模擬結果是觀察在不同干擾載波比(ICR: Interference to Carrier Ratio)條件下,對系統所產生的影響。
Abstract
The separation model for two source frequency modulated (FM) communications of the cochannel signals is developed in this paper. It is presented how the amplitude-locked loop (ALL) system works to improve the phase-locked loop (PLL) system for separating cochannel signals. The high performance demodulator presented in this paper includes both amplitude-locked loop and phase-locked loop block systems.
The ALL system can be separated the dominant and the subdominant signals from each other. On the other hand, the new approach FM demodulator adopted the FM spectrum doubly. It is proposed to apply a similar technique to frequency-shift keying (FSK) modulation methods. Thus, any wireless communication system has to be designed to extract the most communication capacity and throughoutput out of a given spectrum allocation. Consequently, the combined method can be applied to improve the performance of any constant envelope FM transmission system or any other similar form of digital encoding scheme system. The simulation result is the effect of satate observability on the different interference to carrier ratio (ICR).
Contents
Abstract in Chinese i
Abstract ii
Acknowledgements iii
Contents iv
List of Figures vi
List of Tables ix
Chapter 1 Introduction 1
Chapter 2 Background and Analysis 3
2.1 Frequency Modulation 3
2.2 Frequency-Shift Keying 6
2.3 Phase-Locked Loop 7
2.4 Interference on Cochannel Signals 10
Chapter 3 Amplitude Locked Loop 18
3.1 Mathematical Model of the Amplitude-Locked Loop 18
3.1.1 The Basic Concept of ALL 18
3.2 Cochannel Signals Separation 24
3.2.1 Signals Analysis for 0<m<1 28
3.2.2 Signals Separation for m=1 30
Chapter 4 Simulated Performance 32
4.1 ALL Circuit Loop 32
4.2 Simulated performance for cochannel FM signals 38
4.2.1 Cochannel FM Signals Separation 38
4.2.2 Cochannel Speech Signals Separation 43
4.2.3 Cochannel FSK Signals Separation 49
Chapter 5 Conclusions 54
References 55
Appendix 58
List of Publications 59
Biography 61
References
[1]A. M. Pettigrew, “The amplitude-locked loop, the theory and operation of the FM 201/5 high performance FM demodulator”, Ampsys company document, 1996.
[2]Rodger E. Ziemer and William H. Tranter, “Principles of Communications”, Wiley & Sons, Inc. fifth edition, USA, pp. 125-127, 2002.
[3]Roland E. Best, “Phase-locked loops: design, simulation, and application”, McGraw-Hill Company, Inc. 3rd Edition, USA, pp.154-158, 1997.
[4]A. M. Pettigrew and T. J. Moir, “Reduction of FM threshold effect by inband noise canceling”, Electronics Letters, vol.27, pp.1082-1084, 1991.
[5]T. J. Moir and A. M. Pettigrew, “Inband noise cancellation in FM systems: white noise case”, Electronics Letters, vol. 28, no. 9, pp. 814-815, 1992.
[6]A. M. Pettigrew and T. J. Moir, “Coherent demodulation of DSSC without pilot tone using the amplitude loop”, J. Audio Eng Soc, vol. 41, no. 12, pp. 998-1007, 1993.
[7]G. J. Jong, T. J. Su, and T. J. Moir, “The simulation of the Amplitude-Locked Loop with Cochannel Interference using Matlab”, IASTED International Conference, Applied Modeling and Simulation (AMS’ 99) Cairns, Australia, Sep. 1-3, 1999.
[8]T. J. Moir, “Analysis of an amplitude-locked loop”, Electronics Letters, vol. 31, no. 9, pp. 694-695, 1995.
[9]A. M. Pettigrew, T. J. Moir, D. F. Clark, and O. J. Dussarratt, “The Amplitude- Locked Loop, the theory and application of a major improvement in frequency modulation”, Battlefeield Systems Internation, chertsey, Surrey, 4-6 June, 1996.
[10]G. J. Jong and T. J. Moir, “The Performance of the amplitude-locked loop with cochannel interference”, Proc IECON ’98, 31st Aug4th-Sept, Aachen, Germany, 1998.
[11]G. J. Jong, T. J. Su, C. H. Yang, and T. J. Moir, “Remote wireless measuring systems, Emerging Technologies and Factory Automation Proceedings”, ETFA ’97, 6th International Conference on, pp. 55-59, 1997.
[12]G. J. Jong, T. J. Moir, and A. M. Pettigrew, “The high performance FM demodulator using the amplitude-locked loop with cochannel interference”, International Symposium on Communication (ISCOM), Kaohsiung, Taiwan, pp. 284-288, 1999.
[13]G. J. Jong, T. J. Moir, and A. M. Pettigrew, “Co-channel FM interference suppressed by using the amplitude-locked loop for digital communication”, Electronics Letters, vol. 34, no. 8, pp. 719-720, 1998.
[14]John Hamkins, “Joint Viterbi algorithm to separate cochannel FM signals”, Acoustics, Speech, Signal Processing, Proceedings of IEEE International Conference (ICASSP’98), vol. 6, pp. 3297-3300, May 1998.
[15]Meherwan Plad and Benjmin Friedlander, “Separation of co-channel FM/AM signals using the discrete polynomial-phase transform”, Digital Signal Processing Workshop, 6th IEEE, pp. 3-6, 1994.
[16]P. J. Chao, G. J. Jong, Y. L. Jeang, and T. J. Su, “The Noise Cancellation System of the Amplitude-Locked Loop with Cochannel FM Interference”, journal of National Kaohsiung University of Applied and Science, vol. 32, pp. 103-116, 2002.
[17]P. J. Chao, G. J. Jong, G. J. Yu, T. J. Su, and B. D. Liu, “The Noise Elimination System Using the Amplitude-Locked Loop with Cochannel FM interference”, The 6th International Conference on Signal Processing (ICSP’02), Beijing, China, pp. 1668-1671, 2002.
[18]A. Gersho and R. M. Gray, “Vector Quantization and Signal Compression”, Boston, MA: Kluwer Academic, 1993.
[19]John Hamkins, “An Analytic Technique to Separate Cochannel FM signals”, IEEE Transaction on Communications, vol. 48, no. 4, pp. 543-546, Apr. 2000.
[20]John G. Proakis, “Digital Signal Processing”, Wiely & Sons, 2000.
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