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研究生:郭彥志
研究生(外文):Yen-Chih Kuo
論文名稱:多輸入輸出正交分頻多工系統中峰均功率比的減低
論文名稱(外文):On Peak-to-Average Power Ratio Reduction in the OFDM system
指導教授:桑梓賢
指導教授(外文):Tzu-Hsien Sang
學位類別:碩士
校院名稱:國立交通大學
系所名稱:電子工程系所
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:2007
畢業學年度:95
語文別:英文
論文頁數:51
中文關鍵詞:峰均功率比正交多頻分工
外文關鍵詞:PAPROFDMSLM
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這篇論文是考慮在正交多頻分工(OFDM)系統中所傳送信號有著令人討厭的高峰均功率比的問題。在多輸入輸出正交多頻分工( MIMO-OFDM)系統中,因為多根傳送天線,處理峰均功率比的低複雜度架構是很重要的。在眾多降低峰均功率比的方法中,選擇對應法( SLM )是有著相對較高的降低峰均功率比的能力,但同時也有著較高的複雜度和需要傳送額外訊息的缺點。這篇論文中,結合了低複雜度的SLM和傳送額外訊息,模擬顯示他能有效地降低峰均功率比。並將使用多輸入輸出正交分頻多工系統的802.11n規格實作在DSP板上,數據表示出在系統中這架構的確有著很低的時間複雜度。
This thesis considers the Orthogonal Frequency Division Multiplexing (OFDM) system’s undesirable feature of a large peak-to-average power ratio (PAPR) of the transmitted signal. In the MIMO-OFDM system, a low complexity structure to deal with PAPR problem is important because multiple transmitter. In the various PAPR reduction methods, the method selected mapping has high PAPR reduction capability but also high complexity and needs to transmit additional side information. In this thesis, we combine low complexity SLM structure and transmitting the side information, simulation display this method can reduce PAPR effectively. And implement to DSP board using 802.11n which is MIMO-OFDM system, profiling that this structure has low complexity and doesn’t engage much time in the system.
Chapter 1 Introduction...........................9
1.1 PAPR Reduction Scheme........................11
1.1.1 Direct clipping............................11
1.1.2 Block coding...............................11
1.1.3 Partial Transmit Sequence (PTS)............12
1.1.3 Selected Mapping (SLM).....................14
1.1.4 tone injection (TI)........................15
1.1.5 Tone reservation (TR)......................16
1.2 A Low Complexity SLM with conversion matrix[13]................17
Chapter 2 The Brief of EWC PHY Specification For 802.11n.............20
2.1 PLCP Packet Format...........................20
2.2 Operating Mode...............................21
2.3 Modulation and Coding Scheme(MCS)............22
2.4 Transmitter Block Diagram....................25
2.5 Timing Parameter.............................26
Chapter 3 The Brief of Innovative Quixote DSP Board......28
3.1 About Quixote............................28
3.2 Support libraries........................29
Chapter 4 Developing A DSP Program...........32
4.1 A recommended flow of developing a DSP program....32
4.2 Analyzing the C code performance.........33
4.3 Refine the C/C++ code....................34
4.3.1 Using the intrinsic to replace complicated C/C++ code...34
4.3.2 Loop Unrolling.........................35
4.3.2 Word access to the packed data.........36
4.3.2 Using compiler option..................36
4.3 Write linear assembly code...............37
Chapter 5 DSP Board Implementation Result and Discussion....39
5.1 Choose M = 4 in SLM structure.............39
5.2 The use of the conversion matrix..........40
5.3 About insert the side information.........41
5.3 Fixed point format on the DSP board.......42
5.3 Code performance on the DSP board.........43
5.4 About using the digital IO................44
5.5 The estimate of speeding up the program using FPGA....................46
Chapter 6 Conclusion..........................49
Chapter 7 Reference...........................50
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[2] H. Saeedi, M. Sharif, and F. Marvasti, “Clipping noise cancellation in OFDM systems using oversampled signal reconstruction,” IEEE Comm. Lett., vol. 6, pp. 73–75, Feb. 2002.
[3] A. E. Jones, T. A. Wilkinson, and S. K. Barton, “Block coding scheme for reduction of peak to mean envelope power ration of multicarrier transmission schemes, ” Electron. Lett., vol. 30, no. 25, pp. 2098 – 2099, Dec. 1994.
J. A. Davis and J. Jedwab, “Peak-to-mean power control in OFDM, Golay complementary sequences, and Reed- Muller codes,” IEEE Trans. Inform. Theory, vol. 45, no. 7, pp. 2397–2417, Nov. 1999.
[4] K. Yang and S. Chang, “Peak-to-Average Power Control in OFDM Using Standard Arrays of Linear Block Codes,” IEEE Commun. Lett., vol. 7, no. 4, pp. 174–176, Apr. 2003.
K. Patterson, “Generalized Reed-Muller codes and power control in OFDM modulation,” IEEE Trans. Inform. Theory, vol. 46, no. 1, pp. 104–120, Jan. 2000.
[5] D. Wulich and L. Goldfeld, “Reduction of peak factor in orthogonal multicarrier modulation by amplitude limiting and coding,” IEEE Trans. on Commun., vol. 47, no. 1, pp. 18–21, Jan. 1999.
[6] S. H. Müller and J. B. Huber, “OFDM with Reduced Peak–to–Average Power Ratio by Optimum Combination of Partial Transmit Sequences,” Elect. Lett., vol. 33, no. 5, Feb. 1997, pp. 368–69.
[7] A. D. S. Jayalath and C. Tellambura, “Adaptive PTS Approach for Reduction of Peak-to-Average Power Ratio of OFDM Signal,” Elect. Lett., vol. 36, no. 14, July 2000, pp. 1226–28.
[8] R. W. Ba¨uml, R. F. H. Fischer and J. B. H¨uber, “Reducing the peak-toaverage power ratio of multicarrier modulation by selective mapping, ” Electron. Lett., vol. 32, no. 22, pp. 2056 –2 057, Oct. 1996.
[9] M. Breiling, S. H. M¨ uller – Weinfurtner and Johannes B. Huber, “SLM peak-power reduction without explicit side information, ” IEEE Commun. Lett., vol. 5, no. 6, JUNE 2001.
[10] EunJung CHANG, HoYeol KWON, and John M. CIOFFI, “PAR Reduction of Multicarrier Signals Using Injected Tone Constellation”, IEICE TRANS. COMMUN., VOL.E89–B, NO.10 OCTOBER 2006
[11] Krongold, B.S., Jones, D.L.,” An active-set approach for OFDM PAR reduction via tone reservation”, IEEE Commun. Mag., vol. 28, pp. 5-14, May 1990.
[12] Naoto Ohkubo † and Tomoaki Ohtsuki, “A Peak to Average Power Ratio Reduction of Multicarrier CDMA Using Selected Mapping”Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th
[13] Chin-Liang Wang, Ming-Yen Hsu, Yuan Ouyang, “A low-complexity peak-to-average power ratio reduction technique for OFDM systems”, Global Telecommunications Conference, 2003. GLOBECOM '03. IEEE
”[14]Innovative Quixote user manual
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