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研究生:彭政勇
研究生(外文):Cheng-Yung Peng
論文名稱:MB-OFDMUWB感知無線電的干擾廻避技術
論文名稱(外文):Interference Avoidance Techniques for UWB Cognitive Radio
指導教授:黃建華黃建華引用關係
指導教授(外文):Chien-Hwa Hwang
學位類別:碩士
校院名稱:國立清華大學
系所名稱:通訊工程研究所
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:2006
畢業學年度:94
語文別:中文
論文頁數:51
中文關鍵詞:正交分頻多工多頻帶多頻帶正交分頻多工超寬頻感知無線電迴避
外文關鍵詞:OFDMMulti-BandMB-OFDMUWBCognitive RadioAvoidance
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超寬頻 (Ultra Wide Band, UWB) 近年來已成為無線個人區域網
路 (Wireless Personal Area Network, WPAN) 的一項重要技術,它除
了用於高速資料傳輸,仍須具備低耗電量與低干擾的特性。當與受
保護通訊系統共存,未設限的超寬頻發射功率可能嚴重影響受保護
通訊系統;感知無線電技術 (Cognitive Radio) 的出現得以偵測受保
護通訊系統的存在,並且避免對該系統造成干擾,使得對超寬頻發
射功率的限制得以放寬,並對有限頻寬資源達到最有效的運用。
  本論文將以多頻帶-正交分頻多工系統 (Multi-Band Orthogonal
Frequency Division Multiplexing, MB-OFDM) 為超寬頻之通訊架構,
探討與發射功率相近之受保護通訊系統共存時的干擾迴避技術。
吾人將介紹現有的干擾迴避技術:視窗法 (Window Method) 與主動
干擾消除 (Active Interference Canceling, AIC) ;視窗法是將原來欲
傳送資料符元乘上非矩形視窗,使得頻譜形狀較原先集中於各子頻
帶的中心頻率,進而達到降低對受保護頻帶的干擾。主動干擾消除
技術是計算出所有欲傳送資料的子頻帶對受保護頻帶的干擾,並利
用鄰近受保護頻帶的數個不傳送資料子頻帶,計算出如何傳送得以
抵消干擾的資訊,最後將這些干擾消除用子頻帶與傳送資料用子頻
帶同時傳送,即可達到干擾迴避的目的。接下來吾人將基於現有技
術提出修正與類似的方法,包含視窗法的修正與另外的主動干擾消
方法。接著以合併的方式實現干擾迴避。最後對這些方法進行比較,
並提出結論。
In recent years, ultra wide band (UWB) has become the key technology of wireless personal area network (WPAN). It is not only used for high speed data transmission but also has the characteristics of low power consumption and low interference. When sharing the same frequency band with protected communication systems, UWB might severely degrade the service quality of coexisting systems. Cognitive radio is an emerging approach which enables UWB aware of the existence of protected systems. When being notified of the existence of other systems, UWB can limit its transmitted power; thus, the resources of frequency and power can be utilized more efficiently.

In this thesis, we employ multi-band orthogonal frequency division multiplexing (MB-OFDM) as the physical layer transmission scheme, and we investigate the interference avoidance technologies about coexistence between UWB and protected radio services. We will introduce existing interference avoidance methods: window method and active interference canceling (AIC). The window method is to multiply original transmitted data symbol by a non-rectangular window, so that the spectrum shape will be more concentrated. The goal of alleviating interference to licensed band is achieved. The AIC is to calculate the interference resulting from all data sub-carriers toward the protected band, and we use several unused sub-carriers to carry information which can neutralize interference, both transmit these sub-carriers at the same time to achieve interference canceling.
Next we will put forward similar methods based on existing technologies, include revision of window method and another kind of AIC. And then combining methods to relax interference is observed. Finally, compare these methods and put forward the conclusion.
論文摘要 I
Abstract III
誌謝 V

第一章 簡介 1
1.1 研究動機 1
1.2 論文架構 2
1.3 記號表示 3
第二章 MB-OFDM 介紹 4
2.1 OFDM基本原理 4
2.1.1 OFDM調變 5
2.1.2 OFDM解調 7
2.1.3 循環字首 7
2.2 典型Cyclic-Prefix OFDM(CP-OFDM) 9
2.2.1 離散時間基頻模型 9
2.2.2 矩陣表示式 10
2.3 Zero-Padding OFDM(ZP-OFDM) 13
2.3.1 離散時間基頻模型 13
2.3.2 矩陣表示式 14
2.4 MB-OFDM UWB介紹 16
2.4.1 頻帶規畫與使用方式 16
2.4.2 採用ZP-OFDM的原因 17
第三章 現有干擾迴避技術介紹 19
3.1 關閉子頻帶群 (Turn-off Tones) 19
3.2 視窗法 (Window) 22
3.2.1 原理 22
3.2.2 實驗模擬 23
3.3 主動干擾消除 (Active Interference Canceling) 27
3.3.1 原理 27
3.3.2 實驗模擬 30
3.3.3 量化對於「主動干擾消除」係數的影響 32
第四章 再探干擾迴避 36
4.1視窗法的修正 36
4.1.1 原理 36
4.1.2 實驗模擬 37
4.2 動態功率主動干擾消除 40
4.2.1 數學定義 40
4.2.2 實驗模擬 42
4.2.3 次最佳解 (Suboptimal Solution) 43
4.3 各方式合併的干擾迴避 46
4.3.1 視窗法+主動干擾消除 46
4.3.2 動態功率主動干擾消除+主動干擾消除 47
第五章 結論 49
參考文獻 50
[1] FCC, “Revision of Part 15 of the Commission’s Rules Regarding
Ultra-Wideband Transmission Systems,” First Report and Order,
ET Docket 98-153, FCC 02-48, adopted/released Feb. 14/Apr. 22,
2002.

[2] K. Siwiak, P. Withington, and S. Phelan, “Ultra-wide band radio:
the emergence of an important new technology,” IEEE VTC
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[3] X. Zhou, K. Yazdandoost, H. Zhang, and I. Chlamtac, “Cogntive
spectrum: spectrum adaptation and evolution in cognitive ultra
-wideband radio,” IEEE International Conference on Ultra
-Wideband (ICU 2005), Zurich, Sept. 2005

[4] ECC, “Cover note to draft ECC/DEC/(06)AA on UWB,”

[5] M. Z. Win, and R. A. Scholtz, “Impulse radio: how It works,”
IEEE Communications Letters, vol. 2, pp. 36 - 38, Feb. 1998.

[6] R. Fisher et al., “DS-UWB Physical Layer Submission to 802.15
Task Group 3a,” IEEE 802.15-04/0137r3, Motorola, Inc. et al., July
2004

[7] A. Batra et al., “Multi-band OFDM Physical Layer Proposal for
IEEE 802.15 Task Group 3a,” IEEE 802.12-03/268r3, Texas
Instruments et al., March. 2004.

[8] R. van Nee, and R. Prasad, OFDM for Wireless Multimedia
Communications, Artech House, 2000.

[9] Z. Wang and GB Giannakis, “Wireless multicarrier
communications:where fourier meets shannon,” IEEE Signal
Processing Magazine, May 2000

[10] B. Muquet, Z. Wang, GB Giannakis, M. de Courville, and P.
Duhamel, “Cyclic prefixing or zero padding for wireless
multicarrier transmissions ?,” IEEE Trans. Comm., vol. 50, pp.
2136--2148, Dec. 2002.

[11] A. Batra, J. Balakrishnan, G. Roberto Aiello, J. R. Foerster, and A.
Dabak, “Design of a multiband OFDM system for realistic UWB
channel environments,” IEEE Trans. Microwave Theory and
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[12] H. Yamaguchi, “Active interference cancellation technique for
MB-OFDM cognitive radio,” Microwave Conference, 2004. 34th
European Volume 2, pp. 1105-1108, 13 Oct. 2004.

[13] A. Neumaier, “MINQ: General Definite and Bound Constrained
Indefinite Quadratic Programming,” [Online]. Available:
http://www.mat.univie.ac.at/~neum/software/minq/
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