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研究生:王駿翰
研究生(外文):Chun-Han Wang
論文名稱:利用解相關性-最大比例合成技術在跳時超寬頻多個單一輸入多重輸出系統中設計多用戶檢測器
論文名稱(外文):Design of Multiuser Detector for Time-Hopping UWB M-SIMO Systems Based on Decorrelating-MRC Technigue
指導教授:武 維 疆
指導教授(外文):Wei-chiang Wu
學位類別:碩士
校院名稱:大葉大學
系所名稱:電信工程學系碩士班
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:2008
畢業學年度:96
語文別:中文
論文頁數:77
中文關鍵詞:超寬頻多個單一輸入多輸出跳時解相關性最大比例合成多用戶干擾
外文關鍵詞:UWBM-SIMOTime-hopping (TH)Decorrelating-MRC (D-MRC)multi-user interference (MUI)
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本篇論文,在超寬頻(UWB)多個單一輸入多輸出(M-SIMO)系統和多路徑衰減環境下,我們提出兩階段線性多用戶檢測器。多存取系統之架構利用跳時(TH)脈波振幅調變(PAM)技術。在解相關性檢測器中,第一部分先利用每一個天線來消除多用戶干擾(MUI),然後使用最大比例合成(MRC)方式,得到每個使用者最大訊號與雜訊之功率比(SNR)。由於在解相關性最大比例合成(D-MRC)方式之接收機下,通道的資訊是很重要的,我們發展一種以子空間為基礎的盲蔽式M-SIMO通道估計方法。在系統中通道估計錯誤所求出的數值會影響結果。 並且可以從分析與利用空間和時間的差異性的數值結果來驗證此接收機,D-MRC檢測器優於一般普通的單一天線解相關性檢測器。此外,我們證明解相關性最大比例合成方式之接收機與以子空間為基礎的M-SIMO通道估計之計算的可行性及對於near-far的抵抗。
In this paper, we propose a two-stage linear multiuser detector (LMD) for Ultra wideband (UWB) Multiple Single-input Multiple-output (M-SIMO) system and multipath fading environment. Time-hopping (TH) and antipodal pulse amplitude modulation (PAM) are employed for the multiple access system. The decorrelating detector is first employed at the front end of each receive antenna to eliminate the multi-user interference (MUI), then a set of maximum-ratio-combiners (MRC) are proceeded to maximize the signal-to-noise power ratio (SNR) for each user. Since the channel information is crucial for the Decorrelating-MRC (D-MRC) receiver, we develop a subspace-based blind M-SIMO channel estimation method. The effect of channel estimation error on system performance is extensively evaluated. It is also verified from the analytical and numerical results that by exploiting both spatial and temporal diversities, the D-MRC outperforms the conventional single-antenna decorrelating detector. Moreover, we demonstrate that both the decorrelating-MRC (D-MRC) receiver and subspace based M-SIMO channel estimators are computationally feasible and near-far resistant.
封面內頁
簽名頁
授權書.........................iii
中文摘要........................iv
英文摘要........................v
誌謝..........................vi
目錄..........................vii
圖目錄.........................ix
表目錄.........................xi

第一章 緒論......................1
1.1 研究動機..................1
1.2 研究方法..................2
1.3 內容大綱..................2
第二章 UWB通訊系統..................4
2.1 UWB之定義.................4
2.2 UWB IR通訊系統特性.............8
2.3 UWB的應用.................12
2.4 脈波調變..................14
2.4.1 脈波波形...............15
2.4.2 Time-Hopping PAM調變方式.......16
2.5 多重路徑..................20
第三章 利用TH-PAM UWB M-SIMO之D-MRC線性多用戶接收器及盲蔽式M-SIMO子空間通道估計演算法....21
3.1 訊號模式..................22
3.2 設計線性多用戶檢測.............28
3.3 子空間為基礎的盲蔽式多輸入多輸出通道估計演算 法.....................34
3.4 實際情況..................37
3.5 接收機架構之比較..............39
第四章 數值分析與效能評估...............44
4.1 理想情況下之接收機分析...........46
4.2 通道估計之準確度分析............48
4.3 實際情況下之接收機分析...........51
4.4 不同的接收檢測器比較分析..........53
4.4.1 理想情況下之接收機分析........53
4.4.2 通道估計之準確度分析.........55
4.4.3 實際情況下之接收機分析........58
第五章 結論......................60
參考文獻........................62
附錄A.........................65





圖目錄

圖2.1 功率訊號頻譜圖..................4
圖2.2 UWB與傳統的窄頻訊號、寬頻訊號之比較.......6
圖2.3 UWB與現有無線通訊系統之公用頻帶示意圖......6
圖2.4 UWB設備的發射功率限制示意圖...........8
圖2.5 UWB應用範圍 ..................12
圖2.6 PPM與PAM之調變差異 ..............15
圖2.7 高斯脈波示意圖 .................16
圖2.8 一符元之TH BPPM UWB訊號............17
圖2.9 在單一使用者下之TH-BPAM脈衝的例子.......19
圖2.10 在單一使用者下之TH-BPPM脈衝的例子.......19
圖2.11 多重路徑圖 ...................20
圖3.1 上鏈跳時超寬頻通訊系統中多輸入多輸出傳輸架構 ..23
圖3.2 一個位元之TH BPAM訊號 .............24
圖3.3 跳時序列之示意圖 ................26
圖3.4 多路徑通道影響示意圖 ..............27
圖3.5 Chip-matched filtering(CMF)架構圖 .........28
圖3.6 多輸入多輸出超寬頻通訊系統中解相關性最大比例結合
技術多用戶檢測.................30
圖3.7 M-SIMO UWB通訊系統的線性多用戶檢測器 ....39
圖4.1 M改變對於接收機的影響.............46
圖4.2 NcNf改變對於接收機之影響 ............47
圖4.3 取樣觀察次數J(100~1500)對MSE之影響......48
圖4.4 (dB)對MSE(1)之影響.............49
圖4.5 NFR對MSE(1)之影響 ...............50
圖4.6 天線數目M、取樣觀察數目J與 對 之影響 .51
圖4.7 NFR對BER的影響................52
圖4.8 M改變對於接收機的影響 .............53
圖4.9 NcNf改變對於接收機之影響 ............54
圖4.10 取樣觀察次數J(100~1500)對MSE之影響......55
圖4.11 (dB)對MSE(1)之影響.............56
圖4.12 NFR對MSE(1)之影響 ...............57
圖4.13 天線數目M、取樣觀察數目J與 對 之影響 .58
圖4.14 NFR對BER的影響................59













表目錄

表2.1 耗電量比較表..................10
[1]K. S. Gilhousen, I. M. Jacobs, R. Padovani, and L. A. Weaver, “Increased capacity using CDMA for mobile satellite communications,” IEEE Trans. Select. Areas Commun., vol. 8, pp. 503-514, May 1990.
[2]K. S. Gilhousen, I. M. Jacobs, R. Padovani, A. J. Viterbi, and L. A. Weaver, “On the capacity of a cellular CDMA system,” IEEE Trans. Vech. Technol., vol. 40, no. 2, pp. 303-312, May 1991.
[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. Z. Win, R. A. Scholtz, “Impulse radio: How it works,” IEEE Commun. Letters, vol. 2, pp. 36-38, Feb. 1998.
[5]M. Z. Win, R. A. Scholtz, “Ultra-Wide Bandwidth Time-Hopping Spread-Spectrum Impulse Radio for Wireless Multiple-Access Communications,” IEEE Trans. Commun., vol 48, no. 4, Apr. 2000.
[6]Fernando Ramirez-Mireles, “Performance of ultra wideband SSMA using time hopping and M-ary PPM,” IEEE Journal on Select. Areas in Commun., vol. 19, pp. 1186-1196, June 2001.
[7]M. Z. Win and R. A. Scholtz, “Characterization of ultra-wide bandwidth wireless indoor channels: a communication-theoretic view,” IEEE Journal on Select. Area in Commun., pp. 1613-1627, vol. 20, no. 9, Dec. 2002.
[8]V. Lottici, A. D’Andrea, and U. Mengali, “Channel estimation for ultra-wideband communications,” IEEE Journal on Select. Areas in Commun., pp. 1638-1645, vol. 20, no. 9, Dec. 2002.
[9]D. C. Laney, G. M. Maggio, F. Lehmann, and L. Larson, “Multiple access for UWB impulse radio with pseudochaotic time hopping,” IEEE Journal on Select. Areas in Commun., pp. 1692-1700, vol. 20, no 9, Dec. 2002.
[10]D. Porcino, W. Hirt, “Ultra-wideband radio technology: potential and challenges ahead,” IEEE Rail Conference, pp. 201-204, no. 6-8, April. 2004.
[11]S. Verdu, Multiuser Detection, Cambridge University Press, 1998.
[12]M. Ghavami, Ultra wideband signals and systems in communication engineering, John Wiley & Sons, Inc., 2004.
[13]M. Ghavami, Ultra wideband signals and systems in communication engineering, John Wiley & Sons, Inc., 2004.
[14]Gian Mario Maggio, An introduction to UWB, CWC/UCSD & STMicroelectronics, December, 2002.
[15]R. O. Schmidt, “Multiple emitter location and signal parameter estimation,” IEEE Trans. Ant. Propagation, Vol. AP-34:276-290, March 1986.
[16]H. Liu and G. Xu, “A subspace method for signature waveform estimation in synchronous CDMA systems,” IEEE Trans. Commun., Vol. COM-44, No. 10, pp. 1346-1354, Oct. 1966.
[17]FCC, “Revision of Part 15 of the Commission’s Rules Regarding Ultra-Wideband Transmission System,” First Report and Order, ET Docket pp.98-153, Feb. 2002.
[18]C. Fowler, J. Entzminger, J. Vorum, “Report: Assessment of Ultra-Wideband Technology,” OSD/DARPA Ultra-Wideband Rader Review Panel, R-6280, 1990.
[19]Gian Mario Maggio, “An introduction to UWB,” CWC/UCSD & STMicroelectronics, Dec. 2002.
[20]R. Fisher et al., “DS-UWB Physical Layer Submission to 802.15 Task Group 3a,” IEEE 802.15-04/0137r3, Motorola, Inc. et al., Jul. 2004.
[21]A. Batra et al., “Multi-band OFDM Physical Layer Proposal,” IEEE 802.15-03/267r6, Texas Instruments et al., Sept. 2003.
[22]A. Batra et al., “MultiBand OFDM Physical Layer Proposal for IEEE 802.15 Task Group 3a” MBOA-SIG, Sept. 2004.
[23]J. Foerster, E. Green, S. Somayazulu, and D. Leeper, “Ultra-Wideband Technology for Short- or Medium-Range Wireless Communications,” Intel technology Journal, Q2, pp. 1-11, 2001.
[24]Porcino, D.; Hirt, W., “Ultra-Wideband Radio Technology : Potential and Challenges Ahead,” IEEE Communication Magazine, Jul. 2003.
[25]S. Verdu. Multiuser Detection, Cambridge University Press, 1998.
[26]M. L. Welborn, “System considerations for ultra-wideband wireless networks,” IEEE Radio and Wireless Conference, pp. 5-8, 2001.
[27]R. A. Scholtz, “Multiple access with time-hopping impulse modulation,” Proc. MILCOM’93, vol. 2, pp. 447-450, 1993.
[28]Ian Oppermann, Matti Hamalainen, and Jari Iinatti, UWB Theory and Applications, John Wiley & Sons, Inc., 2004.
[29]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.
[30]R. A. Scholtz, “Multiple access with time-hopping impulse modulation,” Proc. MILCOM’93, vol. 2, pp. 447-450, 1993.
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