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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/33464完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 李學智 | |
| dc.contributor.author | Chih-Cheng Chiu | en |
| dc.contributor.author | 邱志成 | zh_TW |
| dc.date.accessioned | 2021-06-13T04:41:59Z | - |
| dc.date.available | 2006-07-20 | |
| dc.date.copyright | 2006-07-20 | |
| dc.date.issued | 2006 | |
| dc.date.submitted | 2006-07-18 | |
| dc.identifier.citation | [1] Maria-Gabriella Di Benedetto and Guerino Giancola Understanding Ultra Band Radio Fundamentals.
[2] Ian Oppermann, Matti Hamalainen and Jari Iinatti UWB Theory and Applications. [3] Moe Z. Win and Robert A. Scholtz. Ultra-wide bandwidth time-hopping spread-spectrum impulse radio for wireless multiple-access communications.IEEEE Transactions On Communications, VOL,48,NO.4, April 2000 [4] Wen-Feng Hu. Performance Comparison of Multi-user Detection and Multi-Antenna Technique for Multi-user DS-CDMA UWB System, June 2005. [5] Hao-Chun Lin. Transmission Performance Simulations for DVB-H System. June 2005. [6] A. Batra, J. Balakrishnan, et al. , Multi-band OFDM physical Layer proposal for IEEE 802.15 Task Group 3a, March, 2004. [7] H. Hashemi, “Impulse Response Modeling of Indoor Radio Propagation Channels,” IEEE Journal on Selected Areas in Communications, Vol. 11, No. 7, pp. 967-978, Sept. 1993. [8] Adel A. M. Saleh and Reinaldo A. Valenzuela, “A Statistical Model for Indoor Multipath Propagation,” IEEE Journal on Selected Areas in Communications, Vol. SAC-5, No. 2, pp. 128-137, Feb. 1987. [9] Andreas F. Molisch and Jeffrey R. Foerster and Marcus Pendergrass, “Channel Models for Ultrawideband Personal Area Networks,” IEEE Wireless Communications, Vol. 10, issue 6, pp. 14-21, Dec. 2003. [10] Theodore S. Rappaport, Wireless Communications: Principles and Practice. 2nd edition, Prentice Hall PTR, 2002. [11] Anuj Batra, Jaiganest Balakrishnan, et al. , Design of a Multiband OFDM System for Realistic UWB Channel Environments, IEEE Transaction on Microwave Theory and Techniques, VOL, 52, NO,9, September. [12] Zong-Hua You, Vector Wideband Idoor Channel Modeling and its Applications to WLAN and Multiple Antenna Elements Systems, June 2005. [13] David Tse and Pramod Viswanath, Fundamentals of Wireless Communication, 2005. [14] Chow Cioffi and Bingham, A practical discrete multitone transceiver loading algorithm for data transmission over spectrally shaped channels, April 1995 [15] Hyung Suk Chu and Chong Koo An, Bit And Subcarrier Allocation For OFDM Transmission Using Adaptive Modulation , 2003. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/33464 | - |
| dc.description.abstract | 在本篇論文中，根據電機電子工程師協會(IEEE)所制定的802.15.TG3a提案，我們實現了每秒200 Mega位元組的正交分頻多工超寬頻的系統。在正交分頻多工超寬頻的系統中所使用的通道模型是修改的SV通道模型。均等增益結合分集(Equal gain combining diversity)和選擇分集(Selection diversity)技術是被用來評估系統表現以達成較低的複雜度。
為了檢驗在正交分頻多工超寬頻的系統在多重路徑表現，我們利用超寬頻的天線去量測真實的通道響應環境。這些量測的通道響應是被用在我們所建構的正交分頻多工超寬頻系統中。根據這些通道量測以及模擬結果，正交分頻多工超寬頻系統的循環字首(cyclic prefix)長度似乎太短。 最後，可適用位元分配演算法也被採用在我們所建構的正交分頻多工超寬頻系統中。我們修改了Chow Cioffi和Bingham所提出的可適用位元分配演算法來降低正交分頻多工超寬頻系統的錯誤率。 | zh_TW |
| dc.description.abstract | In this thesis, we implement the multiband OFDM UWB with data rate of 200Mbps according to the proposal of IEEE 802.15.TG3a Working Group. The modified SV channel model is applied in the multiband OFDM UWB. To achieve lower complexity, the equal gain combining diversity and selection diversity techniques are adopted in the evaluation of the system performance.
We measure the channel responses of the realistic environment by using “Ultra Wideband antennas” in order to examine the impact of multipath delay spread on the performance of the multiband OFDM UWB system. The measured channel responses are applied in the numerical simulation of the multiband OFDM UWB system. According to the result of channel measurement and numerical simulation, the cyclic prefix specified seems to be too short in multipband OFDM UWB systems. Finally, the bit loading algorithm is utilized in this system. We modified the Chow Cioffi and Bingham (CCB) bit loading algorithm and improve the BER performance of the multiband OFDM UWB systems by the adoption of the modified CCB bit loading algorithm. The simulation results support our claim. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T04:41:59Z (GMT). No. of bitstreams: 1 ntu-95-P93942005-1.pdf: 5537423 bytes, checksum: 9f1c43c1a9f7e0d86d5ca10392089551 (MD5) Previous issue date: 2006 | en |
| dc.description.tableofcontents | Abstract ................................................Ⅰ
Contents ................................................Ⅲ List of Figures .........................................Ⅶ List of Tables ..........................................XI Chapter 1 Introduction ..................................1 Chapter 2 Basic Principle of UWB ........................3 2.1 Development of UWB Technology ...............3 2.2 Ultra Wide Band Radio Definition.............4 2.3 Modulation Schemes 5 2.3.1 Impulse Radio Schemes.............5 2.3.2 DS-UWB Signals ...................6 2.3.3 Multi-band OFDM UWB signal........9 2.4 Summary ........................................15 Chapter 3 System Architecture...........................17 3.1 Overview of the OFDM UWB system.............17 3.2 UWB PLCP sublayer...........................20 3.2.1 PLCP frame format................20 3.2.2 Data rate and symbol duration....21 3.3 Data scrambler ..............................22 3.3.1 Tail bits........................24 3.4 Convolutional Encoder.......................24 3.5 Bit interleaving............................27 3.6 Constellation mapping.......................29 3.7 OFDM modulation.............................30 3.7.1 OFDM representation..............30 3.7.2 Pilot subcarriers................31 3.7.3 Guard subcarriers................32 3.8 Spreading of time-domain and frequency-domain.32 3.9 Sub-bands allocation..........................33 3.10 Simulation result............................34 3.11 Summary......................................41 Chapter 4 Channel Models and Multipath Effect for Multiband OFDM UWB.......................................43 4.1 Parameters of Multipath Channels............43 4.1.1 Coherent Bandwidth and Coherent time.....................................................44 4.2 Time Spreading Mechanism....................46 4.2.1 Flat Fading......................46 4.2.2 Frequency selective Fading.......47 4.3 Frequency Spreading Mechanism...............48 4.3.1 Fast fading......................49 4.3.2 Slow fading......................49 4.4 Modified Saleh-Valenzuela Model.............50 4.4.1 Channel Model 1..................54 4.4.2 Channel Model 2..................55 4.4.3 Channel Model 3..................56 4.4.4 Channel Model 4..................56 4.5 Summary.....................................69 Chapter 5 Bit Loading for MB - OFDM UWB.................71 5.1 Water Filling algorithm.....................71 5.1.1 Capacity of AWGN Channel.........71 5.1.2 Water Filling allocation.........72 5.2 Chow Ciofffi and Bingham Bit Loading Algorithm ................................................74 5.2.1 Procedure of CCB algorithm.......74 5.3 Proposed Modified CCB Bit Loading Algorithm................................................76 5.4 Summary.....................................81 Chapter 6 Conclusion....................................83 Reference................................................85 | |
| dc.language.iso | en | |
| dc.subject | 正交分頻多工超寬頻 | zh_TW |
| dc.subject | 循環字首 | zh_TW |
| dc.subject | 可適用位元分配 | zh_TW |
| dc.subject | 多重路徑 | zh_TW |
| dc.subject | 均等增益結合分集 | zh_TW |
| dc.subject | 選擇分集 | zh_TW |
| dc.subject | Selection diversity | en |
| dc.subject | bit loading | en |
| dc.subject | cyclic prefix | en |
| dc.subject | multiband OFDM UWB | en |
| dc.subject | Equal gain combining diversity | en |
| dc.subject | multipath | en |
| dc.title | 正交分頻多工超寬頻系統之多重路徑效應及可適用位元分配 | zh_TW |
| dc.title | Multi-path effects and bit loading for OFDM UWB | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 94-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 唐震寰,闕志達,蘇炫榮,李啟民 | |
| dc.subject.keyword | 正交分頻多工超寬頻,均等增益結合分集,選擇分集,多重路徑,循環字首,可適用位元分配, | zh_TW |
| dc.subject.keyword | multiband OFDM UWB,Equal gain combining diversity,Selection diversity,multipath,cyclic prefix,bit loading, | en |
| dc.relation.page | 86 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2006-07-18 | |
| 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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