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研究生:佘家瑋
研究生(外文):Chia-Wei She
論文名稱:載波干涉-正交分頻多工系統之效能改進
論文名稱(外文):Performance Improvement of CI-OFDM Systems
指導教授:呂振森呂振森引用關係
口試委員:郭天穎陳伯岳
口試日期:2012-07-27
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:電機工程系研究所
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:2012
畢業學年度:101
語文別:中文
論文頁數:61
中文關鍵詞:載波干涉-正交分頻多工正交分頻多工廣義傅利葉轉換均峰值功率比載波頻率偏移選擇性映射
外文關鍵詞:OFDMgeneralized discrete Fourier transformpeak-to-average power ratiocarrier frequency offsetSelected Mapping
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載波干涉-正交分頻多工(CI-OFDM)技術繼承了正交分頻多工調變(OFDM)技術的高頻譜效率及無符碼間干擾等優點,並可大幅降低均峰值功率比(PAPR)。本篇論文主要針對載波干涉-正交分頻多工系統,探討在不影響錯誤率的情況下進一步降低其均峰值功率比。我們使用廣義傅利葉轉換(GDFT)及一位元選擇性映射法 (Selected Mapping Method)去改善載波干涉-正交分頻多工系統的均峰值功率比。本論文針對廣義傅利葉轉換提出一個新的對角矩陣,可較原對角矩陣更進一步降低系統均峰值功率比。並將此一矩陣配合一位元選擇性映射以進一步改善系統效能。由電腦模擬後,所提出的方法可有效降低系統均峰值功率比,同時對載波頻率偏移的估測及位元錯誤率不會造成影響。

The technique of carrier-interferometry orthogonal frequency division multiplexing (CI-OFDM) inherits many advantages of OFDM technique including high bandwidth efficiency and no inter-symbol interference, and it also can reduce peak-to-average power ratio (PAPR) significantly. In this paper, we aim to improve the CI-OFDM systems by reducing the system’s PAPR without loss of bit error rate. We use both generalized Discrete Fourier transform (GDFT) and 1-bit selected mapping method (SLM) to improve CI-OFDM systems. In GDFT, we propose a new diagonal matrix to improve the system’s PAPR. We further use this matrix in 1-bit SLM to improve the CI-OFDM systems. After the computer simulations, our results show that these methods can significantly reduce the PAPR of CI-OFDM systems without affecting the carrier frequency offset estimation and bit error rate

中文摘要i
英文摘要ii
誌謝iii
目錄iv
表目錄vi
圖目錄 vii
第一章 緒論 1
1.1 前言1
1.2 研究動機與方法2
1.3 各章內容3
第二章 系統模型與知識背景4
2.1 OFDM系統簡介4
2.1.1 OFDM系統的正交性4
2.1.2 OFDM系統介紹6
2.1.3 OFDM系統優點與缺點8
2.2 載波頻率偏移CFO9
2.2.1 CFO簡介9
2.2.2估測CFO之演算法介紹12
2.3 OFDM系統之均峰值功率比17
2.4 選擇性映射簡介19
2.5 CI-OFDM載波干涉正交分頻多工20
2.6廣義離散傅立葉轉換簡介24
2.6.1 如何設計G矩陣26
第三章 系統效能分析與模擬28
3.1 系統均峰值功率比之分析與比較28
3.1.1 廣義傅立葉轉換之應用28
3.1.2 選擇性映射SLM之應用35
3.2 可加性高斯白雜訊下的均方誤差模擬45
3.2.1 電腦模擬結果45
3.3 可加性高斯白雜訊下的位元錯誤率模擬 47
3.3.1 電腦模擬結果48
3.4 多路徑雷利通道下之均方誤差模擬50
3.4.1 電腦模擬結果51
3.5 多路徑雷利通道下的位元錯誤率模擬53
3.5.1 電腦模擬結果54
第四章 結論分析與未來發展57
4.1 結論分析57
4.2 未來發展58
參考文獻60


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[2]Xiaowen Gu and Seungmin Baek and Suwon Park, " PAPR reduction of OFDM signal using an efficient SLM technique," Advanced Communication Technology (ICACT), 2010 The 12th International Conference on, vol.1, pp.324-328, 7-10 Feb. 2010.
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[4]X. Wang, T. T. Tjhung, and C. S. Ng, "Reduction of peak-to-average power ratio of OFDM system using a companding technique, " IEEE Trans. Broadcast., vol.45, pp.303–307, Sep. 1999.
[5]J. K. Cavers, Mobile channel characteristics, Boston Kluwer, 2000.
[6]楊東海,載波頻率偏移估測法於正交分頻多工系統之效能改進,碩士論文,國立臺北科技大學電機工程研究所,台北, 2008。
[7]Moose, P.H., "A technique for orthogonal frequency division Multiplexing frequency offset correction," IEEE Transactions on Communications, vol.42, no.10, pp.2908-2914, Oct. 1994.
[8]F. H Raab et. al., "Power amplifiers, and transmitters for RF and microwave," IEEE Trans Microwave Theory Tech, vol. 50, pp. 814-826, Mar. 2002.
[9]Zhiqiang Wu and Zhijin Wu Wiegandt, D.A. and Nassar, C.R.,"High-performance 64-QAM OFDM via carrier interferometry spreading codes," Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th, vol.1, pp. 557- 561 Vol.1, 6-9 Oct. 2003.
[10]Heung-Gyoon Ryu, Sang Burm Ryu, Seon-Ae Kim,” Design and Performance Evaluation of the MIMO SFBC CI-OFDM Communication System,” 2008. ICWMC ''08. The Fourth International Conference on Wireless and Mobile Communications, pp. 60-64, Jul. 2008.
[11]Fang Xu, Ru Xu and Haixin Sun, ” Implementation of Carrier Interferometry OFDM by Using Pulse Shaping Technique,” 2007 IEEE International Workshop on Anti-counterfeiting,Security ,Identification, pp. 319 – 323, 16-18 Apr. 2007.
[12]Anwar, K.; Yamamoto, H., “A New Design of Carrier Interferometry OFDM with FFT,” 2006 IEEE Radio and Wireless Symposium, pp. 543 – 546, Jan. 2006.
[13]Akansu, A.N. and Agirman-Tosun, H.,“Generalized discrete Fourier transform:Theory and design methods,” Sarnoff Symposium, 2009. SARNOFF ''09. IEEE, pp.1-7, March 30 2009-Apr. 1 2009.
[14]Akansu, A.N. and Agirman-Tosun, H., “Generalized Discrete Fourier Transform with optimum correlations,” Acoustics Speech and Signal Processing (ICASSP),2010 IEEE International Conference on , pp.4054-4057, March 2010.
[15]Akansu, A.N. and Agirman-Tosun, H., "Generalized Discrete Fourier Transform With Nonlinear Phase," Signal Processing, IEEE Transactions on , vol.58, no.9,pp.4547-4556, Sep. 2010.
[16]葉育辰,廣義傅利葉演算技術應用於正交分頻多工系統之效能改進,碩士論文,國立臺北科技大學電機工程研究所,台北,2011。
[17]Asseri, M.I. and Tsimenidis, C.C. and Sharif, B.S. and Le Goff, S.Y., “Orthogonal-SLM technique for PAPR reduction and recovery without side information in OFDM systems,” Communication Systems Networks and Digital Signal Processing (CSNDSP), 2010 7th International Symposium on ,pp.162-166, 21-23 Jul. 2010


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