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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 蘇炫榮(Hsuan-Jung Su) | |
| dc.contributor.author | Jui-Lin Yen | en |
| dc.contributor.author | 顏瑞霖 | zh_TW |
| dc.date.accessioned | 2021-06-13T03:18:17Z | - |
| dc.date.available | 2006-08-01 | |
| dc.date.copyright | 2006-08-01 | |
| dc.date.issued | 2006 | |
| dc.date.submitted | 2006-07-28 | |
| dc.identifier.citation | [1] S. Haykin, “Cognitive Radio: Brain-Empowered Wireless Communications,” IEEE Journal on Selected Areas in Commun., vol. 23, no. 2, Feb. 2005
[2] Federal Communications Commission, “Spectrum Policy Task Force,” Rep. ET Docket no. 02-135, Nov. 2002. [3] P. Kolodzy et al., “Next generation communications: Kickoff meeting,” in Proc. DARPA, Oct. 17, 2001. [4] M. McHenry, “Frequency agile spectrum access technologies,” in FCC Workshop Cogn. Radio, May 19, 2003. [5] G. Staple and K. Werbach, “The end of spectrum scarcity,” IEEE Spectrum, vol. 41, no. 3, pp. 48-52, Mar. 2004. [6] J. Mitola et al., “Cognitive radio: Making software radios more personal,” IEEE Pers. Commun., vol. 6, no. 4, pp. 13-18, Aug. 1999. [7] J. Mitola, “Cognitive radio: An integrated agent architecture for software defined radio,” Doctor of Technology, Royal Inst. Technol. (KTH), Stockholm, Sweden, 2000. [8] K. M. Wong, Jiangfeng Wu, T. N. Davidson and Qu Jin, “Wavelet packet division multiplexing and wavelet packet design under timing error effects,” IEEE Trans. on Sig. Proc., vol. 45, no. 12, Dec. 1997. [9] A. R. Lindsey, “Wavelet packet modulation for orthogonally multiplexed communication,” IEEE Trans. on Sig. Proc., vol. 45, no. 5, May 1997. [10] S. Ulukus and R. D. Yates, “Iterative construction of optimum signature sequence sets in synchronous CDMA systems,” IEEE Trans. on Inform. Theory, vol. 47, no. 5, Jul. 2001. [11] S. Ulukus and R. D. Yates, “User capacity of asynchronous CDMA systems with matched filter receivers and optimum signature sequences,” IEEE Trans. on Inform. Theory, vol. 50, no. 5, May 2004. [12] Y. Meyer, Ondelettes, vol. 1 of Ondelettes et operateurs. Paris, France: Hermann, 1990, in French; Y. Meyer, Wavelets and Operators. Cambridge, U.K.: Cambridge Univ. Press, 1992, English translation by D. H. Salinger. 59 [13] S. G. Mallat, “A theory for multiresolution signal decomposition: The wavelet transform,” IEEE Trans. Pattern Anal. Machine Intell., vol. 11, pp. 674-693, July 1989. [14] R. R. Coifman and M. V. Wickerhauser, “Entropy-based algorithms for best basis selection,” IEEE Trans. Inform. Theory (Special issue on wavelet transforms and multiresolution signal analysis), vol. 38, pt.2, pp. 713-718, Feb. 1992. [15] J. G.. Proakis, Digital Communications, 3rd ed. New York: McGraw-Hill, 1995. [16] J. Zander and S. L. Kim, Radio resource management for wireless networks. Norwood, MA: Artech House, 2001. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/31715 | - |
| dc.description.abstract | 近年來，隨著無線通訊技術的快速發展，無線電磁頻譜變成了一項珍貴的天然資源。許多研究和報告指出了非有效率使用頻寬的問題。感知無線電 (CR)，包括軟體無線電 (software-defined radio)，已被視為一種藉由發掘無人使用的頻譜，進而提升頻譜使用效率的工具。
在本篇論文中，我們將探討小波包封的特性，並且利用它們來設計感知無線電使用者的特徵波形。我們分別考慮了原註冊許可的使用者為正交分頻多工系統 (OFDM system) 以及小波包封多工系統 (WPDM system)，並且比較在感知系統中，對於頻率－時間平面不同的切割方式所造成的差異。 我們也提出一個演算法，根據所測量得到的干擾訊號去切割CR使用者的頻率－時間平面，並且與任意切割去比較其效果的差異。 | zh_TW |
| dc.description.abstract | Recently, with the fast development of wireless communications, the radio electromagnetic spectrum becomes a precious natural resource. Many researches and reports reveal the problems of inefficient spectrum utilization. Cognitive radio (CR), inclusive of software-defined radio, has been proposed as a means to promote the efficient use of the spectrum by exploiting the existence of spectrum holes.
In this thesis, we discuss the properties of wavelet packet, and utilize them to design the signature waveforms of CR users. We consider that legacy users are Orthogonal frequency division multiplexing (OFDM) system users and Wavelet packet division multiplexing (WPDM) system users, respectively, and show the comparisons between the different tiling methods of Frequency-Time plane (F-T plane) of CR systems. We also propose an algorithm to tile the F-T plane of CR systems according to the measured interference, and compare the performances with those of arbitrary tiling of F-T plane. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T03:18:17Z (GMT). No. of bitstreams: 1 ntu-95-R93942111-1.pdf: 5741058 bytes, checksum: 22a9e48e2433349db3f63c76dabe5257 (MD5) Previous issue date: 2006 | en |
| dc.description.tableofcontents | List of Figures………………………………………………………….. V
Chap1 Introduction………………………………………………….. 1 1.1. Cognitive Radio Systems………………………………………………… 1 1.2. Motivation………………………………………………………………... 4 1.3. Contribution and Thesis Organization……………………….................... 5 Chap2 Preliminary…………………………………………………... 6 2.1. Wavelet Packet Division Multiplexing…………………………………... 6 2.1.1 Wavelet Packet………………………………………………………… 6 2.1.2 Comparisons of Some Multiple Access Techniques…………………... 8 2.2. MMSE Update Algorithm………………………………………………. 10 2.2.1 Synchronous Systems………………………………………………… 10 2.2.2 Asynchronous Systems………………………………………………. 12 Chap3 Joint WPDM and MMSE Update Algorithm…………….. 15 3.1. Introduction of the Joint Approach……………………………………... 15 3.2. Systems Model and Assumptions………………………………………. 15 3.3. Downlink Channel……………………………………………………… 18 3.3.1 Numerical Results and Discussion…………………….……………... 18 3.4. Uplink Channel…………………………………………………………. 27 3.4.1 Numerical Results and Discussion…………………….……………... 28 IV Chap4 Algorithm for the Tiling method of F-T Plane…………… 35 4.1. Properties of Wavelet Packet…………………………………………… 35 4.2. Tiling Methods of F-T Plane……………………………………………. 36 4.3. Numerical Results and Discussion……………………………………... 39 Chap5 Conclusions and Future Works ……………………...……. 57 Bibliography…………………………………………….………….…. 58 | |
| dc.language.iso | en | |
| dc.title | 感知無線電系統之可適性特徵波形設計 | zh_TW |
| dc.title | Adaptive Signature Waveforms Design for Cognitive Radio Systems | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 94-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 葉丙成,易志孝 | |
| dc.subject.keyword | 感知無線電,特徵波形, | zh_TW |
| dc.subject.keyword | cognitive radio,signature, | en |
| dc.relation.page | 59 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2006-07-30 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
| 顯示於系所單位： | 電信工程學研究所 | |
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