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研究生:洪一紳
研究生(外文):Ethan Hung
論文名稱:無線通訊高頻譜效益正交重疊調變技術之應用
論文名稱(外文):Bandwidth Efficiency Quadrature Overlapping Modulation for Applications in Wireless Communications
指導教授:陳曉華陳曉華引用關係歐陽彥杰
學位類別:碩士
校院名稱:國立中興大學
系所名稱:電機工程學系
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:2002
畢業學年度:90
語文別:英文
論文頁數:114
中文關鍵詞:調變技術正交重疊偵測技術決定回授軟性最相近序列偵測硬性最相近序列偵測最佳接收器次佳接收器
外文關鍵詞:ModulationQuadrature OverlappingDetectionDecision FeedbackSoft MLSDHard MLSDOptimum ReceiverSub-Optimum Receiver
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隨著多媒體與無線通訊的蓬勃發展,無線頻帶的需求日益殷切,如何在在有限的無線頻寬中傳輸大量的資料是重要的課題。
正交重疊調變技術是一種具有高頻帶利用效益的調變技術,其主要原理是在載波調變之前先利用波形整型技術先對基頻訊號整型,再經波形的重疊處理,再送至載波調變。此項調變技術較原OQPSK, MSK調變技術擁有較大之衰落因子(roll-off factor),以正交重疊升餘弦調變為例,其旁波瓣功率頻譜密度衰減速度可達 ,因此有較高的頻帶效益。
在本論文中研究不同的接收器對正交重疊調變的適應性。理論分析及模測試數種偵測技術,包括半波週期偵測、全波週期相似性偵測、全波週期平均波形濾波器、中央半波週期相似性偵測、中央半波週期平均波形濾波器、決定回授、硬性最相近序列偵測和軟性最相近序列偵測。並以Matlab應用程式完成各項的模擬測試。結果顯示,軟性最相近序列偵測為最佳接收器,而中央半波週期平均波形濾波器為次佳接收器且具有優點如結構簡單和無延遲效應。結果並顯示,適當的組合如波週期平均波形濾波器配合QOTC波形調變不僅具有更高頻譜效益,更能降低誤碼率。
With the booming growth of multimedia and wireless communications, the demand for wireless bandwidth is urgent. So, how to transmit more information within a limited bandwidth is an important issue.
Quadrature Overlapping Modulation has been proven a bandwidth efficiency modulation technique. The main theories are the baseband pulse waveform shapping of overlapping pulse and quadrature combining before carrier modulation. This modulation technique can possess a larger roll-off factor. For example, the sidelobes of Quadrature Overlapped Raised-Cosine (QORC) modulation drop off much faster ().
Several types of receivers are investigated about the adaptation with Quadrature Overlapping Modulation. Analysis and simulations of several kinds of detection schemes are presented, including Half Symbol Period Correlation, Whole Symbol Period Correlation, Whole Symbol Period Average Waveform Matched Filter, Central Half Symbol Period Correlation, Central Half Symbol Period Average Waveform Matched Filter, Decision Feedback, Hard Maximum Likelihood Sequence Detection (Hard MLSD) and Soft Hard Maximum Likelihood Sequence Detection (Soft MLSD). Simulation was done with Matlab, the result shows that the Soft MLSD is the optimum detection and Central Half Symbol Period Average Waveform Matched Filter could be considered as the sub-optimum detection for high performance evaluation and advantages of ‘simple structure' and ‘no delay'. It also shows that the combination of sub-optimum detection with QOTC modulation performs outstandingly both in bandwidth efficient aspect and bit-error-rate performance.
Chapter1 Introduction
1.1 Digital Modulations
1.2 Principle of Quadrature Pulse-Overlapping Modulation
1.3 Waveform Composition
1.4 Detections of QPOM
1.5 Organization of Thesis
Chapter2 Detections in AWGN Channels
2.1 Performance Evaluation
2.2 Simulations with Different Detection Schemes
2.2.1 Baseband Symbol by Symbol Detections
2.2.1.1 Half Symbol Period (T Period) I&D Filter Coherent Detection / 2.2.1.2 Half Symbol Period (T Period) Matching Filter Coherent Detection / 2.2.1.3 Central Half Symbol Period (Central T Period) Correlation Coherent Detection / 2.2.1.4 Central Half Symbol Period (Central T Period) Average Matched Filter Coherent Detection / 2.2.1.5 Whole Symbol Period (2T period) Correlation Coherent Detection / 2.2.1.6 Whole Symbol Period (2T Period) Matching Filter (Matching One Waveform) Coherent Detection / 2.2.1.7 Performance Comparison
2.2.2 Equalization Methods
2.2.2.1 Decision Feedback/ 2.2.2.2 Hard-ML Detection / 2.2.2.3 Soft-ML Detection / 2.2.2.4 Performance Comparison
2.3 Discussion
2.4 Sampling Rate
Chapter3 Detections in Fading Channels
3.1 Multipath Fading
3.1.1 Rayleigh Fading
3.1.2 Rician Fading
3.2 Upper Bound Performance Evaluations in Rayleigh Channel
3.3 Simulations in Rayleigh Fading Channel
3.3.1 Baseband Symbol by Symbol Detections
3.3.1.1 Half Symbol Period (T Period) Correlation Coherent Detection / 3.3.1.2 Whole Symbol Period (2T period) Correlation Coherent Detection / 3.3.1.3 Whole Symbol Period (2T Period) Matching Filter Coherent Detection / 3.3.1.4 Central Half Symbol Period (Central T Period) Coherent Correlation Coherent Detection / 3.3.1.5 Central Half Symbol Period (Central T Period) Average Matched Filter Coherent Detection / 3.3.1.6 Performance Comparison
3.3.2 Equalization Methods
3.3.2.1 Decision Feedback/ 3.3.2.2 Hard-ML Detection / 3.3.2.3 Soft-ML Detection / 3.3.2.4 Performance Comparison
3.3.3 Sampling Rate
3.4 Simulations in Rician Fading Channel
3.4.1 Baseband Symbol by Symbol Detections
3.4.1.1 Half Symbol Period (T Period) Correlation Coherent Detection / 3.4.1.2 Whole Symbol Period (2T period) Correlation Coherent Detection / 3.4.1.3 Whole Symbol Period (2T Period) Matching Filter Coherent Detection / 3.4.1.4 Central Half Symbol Period (Central T Period) Coherent Correlation Coherent Detection / 3.4.1.5 Central Half Symbol Period (Central T Period) Average Matched Filter Coherent Detection / 3.4.1.6 Performance Comparison
3.4.2 Equalization Methods
3.3.2.1 Decision Feedback/ 3.3.2.2 Hard-ML Detection / 3.3.2.3 Soft-ML Detection / 3.3.2.4 Performance Comparison
3.4.3 Sampling Rate
Chapter4 Multipath Fading Channel Receiver
4.1 Multipath Channel
4.2 Diversity
4.2 Diversity Combining
4.4 Simulations
4.4.1 Delays
4.4.2 Diversity Combining
4.4.3 Three Paths (L=3) Reception
Chapter5 Sub-Optimum Detection of QOTC Modulation
Chapter6 Conclusions
[1] M. C. Austin & M. U. Chang, “Quadrature overlapped raised-cosined modulation”, IEEE Trans. Commun., vol. COM-29, NO.3,pp.237-249,March 1981.
[2] X. H. Chen & J. Oksman, “A Quasi-constant envelope quadrature overlapped modulation & its performance over nonlinear bandlimitted satellite channels”, International Journal of Satellite Communications, John Wiley & Sons, Vol. 14, pp.351-359, 1996.
[3] X. H. Chen & W. H. ONG, “Performance Analysis of Quadrature Overlapping Modulations Over Nonlinear Fading Channels”, Singapore ICCS/’94
[4] X. H. Chen & S. Y. Wong, “Four Novel Quadrature Overlapping Modulations
and Their Spectral Efficiency Analysis Over Band-Limited Non-Linear Channels",
Int. Journ. Satellite Comm., vol. 15, pp.117-127, 1997.
[5] S. B. Slimane & T. Le-Ngoc, “Performance of Quadrature Pulse-Overlapping Modulated Signals in Rayleigh Fading Channels”, IEEE GLOBECOM ’91.
[6] S. B. Slimane & T. Le-Ngoc, “Maximum Likelihood Sequence Estimation of Quadrature Pulse-Overlapping Modulated Signals for Portable/Mobile Satellite Communications”, IEEE Journal on SAC. VOL.10, NO.8, Oct. 1992
[7] E. Zehavi & J. K. Wolf, “On the Performance Evaluation of Trellis Codes”, IEEE Trans. Commun. Vol. IT-33, No.2, Mar. 1987
[8] S. Bendetto et al., “Combined coding and modulation: Theory and applications,” IEEE Trans. Inform. Theory, vol.34 pp.223-236, Mar.1988
[9] J. G. Proakis, Digital Communications, McGraw Hill, 2001.
[10] J. G. Proakis and M. Salehi, Contemporary Communication Systems using MATLAB, Brooks/cole, 2000
[11] X. H. Chen, Digital Modulation Techniques, ChanHwa Science Technology Book CO, LTD, Taiwan, 2001
[12] T. S. Rapport, Wireless Communication Principle & Practice, Prentice Hall, 1996
[13] V. C. Ramasami, EECS Project, 2001
[14] M. K. Simon & T. Y. Yan, “Unfillter FQPSK: Another Interpretation and Further Enhancements”, Applied Microwave & Wireless, Feb. 2000.
[15] M. K. Simon & P. Arabshahi and M. Srinivasan, “Trellis-Coded Quadrature-Phase-Shift Keying (QPSK) With Variable Overlapped Raised-Cosine Pulse Shaping”, TMO Progress Report 42-136, Feb. 1999.
[16] D. K. Borah and S. Horan, “Detection Techniques for Enhanced FQPSK Signals”, IEEE 2001
[17] M. K. Simon & M. S. Alouini, “ A Unified Approach to the Performance Analysis of Digital Communication over Generalized Fading Channels”, IEEE proc. Vol.86, No.9, Sep.1998.
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1. 莊明貞(民85)。國小社會科教學評量的改進途徑─從「真實性評量」實施談起。教育資料與研究,13期,36-40。
2. 莊明貞(民84)。從變通式測驗的發展談國小教育評量的可行途徑。教育資料與研究,2期,15-16。
3. 莊明貞(民84)。在國小課程的改進與發展---真實性評量。教師天地,79期,21-25。
4. 張清濱(民85)。多元化的教學評量。研習資訊,13卷,3期,1-10。
5. 張文華、郭重吉(民84)。科教革新中評量理念的重建。教育研究雙月刊,45期,23-30。
6. 范熾文(民89)。新式教學評量:實作評量與卷宗評量概述。空大學訊,254期,64-69。
7. 吳毓瑩(民87)。我看、我畫、我說、我演、我想、我是誰呀?--卷宗評量之概念、理論與應用。教育資料與研究,20期,13-17。
8. 吳毓瑩(民82)。教學評量的學與用。國民教育,34卷,1期,12-14。
9. 余安邦(民85)。當前國民小學社會科課程、教學及評量的分析與批判。教育資料與研究,13期,16-19。
10. 王惠娟(民85)。教學評量的理論與省思。南投文教,9期,15-17。
11. 彭森明(民85)。實作評量( Performance assessment)理論與實務。教育資料與研究,9期,44-48。
12. 曾吉雄(民88)。新式評量─檔案評量。教育資料文摘,第44卷第1期,133-137。
13. 湯清二(民86)。另一種評量工具的選擇---學習檔案。教育實習輔導季刊,第三卷第一期,23-26。
14. 黃秀文(民85)。從傳統到變通:教學評量的省思。國民教育研究學報,2期,1-26。
15. 詹志禹(民82)。教學評量的趨勢。教育研究雙月刊,30期,15-23。
 
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