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研究生:余泓緯
研究生(外文):Hong-Wei Yu
論文名稱:下鏈直序超寬頻脈波無線電系統在多重路徑干擾下之盲敝式接收機設計
論文名稱(外文):Blind Signal Reception in Downlink Direct-Sequence Ultra Wideband Impulse Radio System in The Presence of Multipath Fading
指導教授:武維疆武維疆引用關係
指導教授(外文):Wei-Chiang Wu
口試委員:李立民王居尉
口試日期:2011-06-23
學位類別:碩士
校院名稱:大葉大學
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:2011
畢業學年度:99
語文別:英文
論文頁數:56
中文關鍵詞:超寬頻盲敝式估計RAKE接收機多用戶干擾下鍊
外文關鍵詞:Ultra widebandBlind estimationRAKE receiverMulti-user interferenceDownlink
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超寬頻 (UWB) 脈波無線電系統因其低功率,不需載波及多重路徑多樣性等優點,近來受到廣泛的注意。在許多的調變及多工技術當中,本文探討直序 (DS) 二位元相移 (BPSK) 調變使用於下鏈多重路徑干擾通道。我們首先概述同步DS-UWB 系統吸引人之特性並且據以設計一低複雜度之RAKE 行動台 (MS)接收機。然而,由於準確的通道訊息是可靠解調之決定因素,因此本文提出一盲蔽式 (不需數據幫助) 通道估計器。我們進行性能評估以驗證通道估計法則之準確度 (以均方根誤差為衡量標準) 以及盲敝式行動台接收機之可靠度 (以位元錯誤率為衡量標準)。
Ultra wideband (UWB) impulse radio (IR) system has currently being considered for several applications due to its attractive features that include low-power carrierless and ample multipath diversity. The various modulation and multiple access schemes. In this thesis deals with direct sequence (DS) binary phase shift keying (BPSK) modulation operating in the presence of multipath fading downlink channel. We first outline the attractive properties of the synchronous DS-UWB scheme and design a low-complexity RAKE mobile station (MS) receiver. However, since accurate channel information is crucial for reliable operation, thereby we propose a blind (non-data aided) channel estimator. Performance evaluations are conducted to demonstrate the accuracy (in terms of root mean square error) of the proposed channel estimation algorithm and the reliability (in terms of bit error rate) of the blind MS receiver.
Contents

中文摘要 iii
Abstract iv
誌謝 v
Contents vi
List of figures viii

Chapter 1 Introduction 1
1.1 Background 1
1.2. Research methods 1
1.3 Content Outline 2
Chapter 2 Spread spectrum communication techniques 3
2.1 Direct-sequence spread spectrum (DSSS) 3
2.1.1 DSSS transmission method 3
2.1.2 Benefits of DSSS 5
2.1.3 BPSK DSSS 6
2. 2 PN Code 8
2.2.1 Walsh code 10
2.3 Rake receiver 11
2.4 DS-CDMA 13
Chapter 3 Introduction UWB IR techniques 15
3.1 UWB IR Introduction 15
3.1.1 Key benefits of UWB 15
3.1.2 UWB and Shannon’s theory 16
3.1.3 UWB definition 18
3.1.4 UWB applications 19
3.2 Signal model of UWB IR (Single user) 20
3.2.1 BPAM 21
3.2.2 BPPM 21
3.3 Signal model of UWB IR (Multi user) 22
3.3.1 Time-Hopping PAM modulation 22
3.3.2 Time-Hopping PPM modulation 23
3.4 Multipath 24
Chapter 4 Blind signal reception scheme 27
4.1 UWB-IR Signal model 28
4.1.1 DS-UWB(Direct Sequence UWB) 29
4.2 RAKE receiver 33
4.3 Blind channel estimation algorithm 36
Chapter 5 Performance evaluation 40
Chapter 6 Conclusion 44
References 45
Appendix A : (Proof ’s eigenvalues) 47
Appendix B(Proof (28)) 48
References
[1] M. Z. Win and R. A. Scholtz, “Ultra wide bandwidth time-hopping spread-spectrum impulse radio for wireless multiple access communications” IEEE Trans. on Communications, vol.48, no.4, pp. 679-691, April 2000.
[2] M. Z. Win, R. A. Scholtz and M. A. Barnes, “Ultra-wide bandwidth signal propagation for indoor wireless multiple access communications” in Proc. IEEE Int. Conf. Communications, vol. 1, Montreal, Canada, June 1997, pp.56-60.
[3] M. Z. Win and R. A. Scholtz, “On the robustness of ultra-wide bandwidth signals in dense multipath environments” IEEE Commun. Lett., vol.2, pp.51-53 Feb. 1998.
[4] M. L. Welborn, “System considerations for ultra-wideband wireless networks” in IEEE Int. Conf. Radio and Wireless Communication, 2001, pp.5-8.
[5] M. Z. Win and R. A. Scholtz, “Impulse radio: How it works” IEEE Communications Letters, vol. 2, no. 1, January 1998.
[6] R. A. Scholtz, “Multiple access with time-hopping impulse modulation” in Proc. Int. Conf. MILCOM’93, vol. 2, 1993, pp. 447-450.
[7] F. R. Mireles, “Performance of ultrawideband SSMA using time hopping and M-ary PPM” IEEE J. Select. Areas Commun., vol. 19, no. 6, pp. 1186-1196, June 2001.
[8] L. Zhao and A. M. Haimovich, “Multiuser capacity of M-ary PPM ultra-wideband communications” in IEEE Int. Conf. Ultra Wideband Systems and Technologies, May 2002, pp. 175-179.
[9] J. R. Foerster, “The performance of a direct sequence spread ultrawideband system in the presence of multipath, narrowband interference, and multiuser interference” in IEEE Int. Conf. Ultra Wideband Systems and Technologies, May 2002, pp. 87-91.
[10] N. Boubaker and K. B. Letaief, “Ultra wideband DSSS for multiple access communications using antipodal signaling” in Proc. IEEE Int. Conf. Communications, May 2003, pp. 2197-2201.
[11] R. Price and P. E. Green, “A communication technique for multipath channel” Proceedings of the IRE, pp. 555-570, March 1958.
[12] M. Ggavami, L.B. Michael and R. Kohno, “Ultra wideband signals and systems in communication engineering” 2004
[13] H. Lee, B. Han, Y. Shin, and S. Im, “Multipath characteristics of impulse radio channels” in Proc. IEEE Int. Conf. Vehicular Technology, Tokyo, Japan, Spring 2000, pp. 2487-2491.
[14] R. A. Horn and C. R. Johnson, Matrix Analysis, Cambridge University Press, 1985.
[15] T. K. Moon and W. C. Stirling, Mathematical Methods and Algorithms, Prentice-Hall, Inc. 2000.
[16] Roger L. Peterson, Roger E. Ziemer and David E. Borth, Introduction to Spread-Spectrum Communication, Prentice Hall, Inc. 1995
[17] http://en.wikipedia.org/wiki/Direct-sequence_spread_spectrum
[18] http://en.wikipedia.org/wiki/Walsh_code
[19] http://wireless.per.nl/reference/chaptr05/cdma/rake.htm
[20] http://en.wikipedia.org/wiki/Ultra-wideband
[21] http://en.wikipedia.org/wiki/Multipath_propagation
[22] http://home.iitk.ac.in/~arlal/book/nptel/mth102/node45.html
[23] 喻超凡. 林郁. 姚碩博士, 線性代數 鼎茂圖書出版股份有限公司

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