研究生: |
楊中和 CHUNG-HO YANG |
---|---|
論文名稱: |
結合降低峰均功率比技術與多項式預扭器技術之效能分析 Performance Analysis of Combination of PAPR Reduction Schemes and Polynomial Predistorter Techniques |
指導教授: |
張立中
Li-Chung Chang |
口試委員: |
曾德峰
Der-Feng Tseng 曾恕銘 none 白宏達 none |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電機工程系 Department of Electrical Engineering |
論文出版年: | 2009 |
畢業學年度: | 97 |
語文別: | 中文 |
論文頁數: | 68 |
中文關鍵詞: | 正交分頻多工調變 、峰均功率比 、相位反轉 、直接學習架構 、記憶性多項式預扭器 |
外文關鍵詞: | OFDM, PAPR, phase reversal, IDL, DL, MPPD |
相關次數: | 點閱:184 下載:3 |
分享至: |
查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
由於功率放大器所具有的非線性效應常會為無線通訊系統帶來帶內失真及帶外放射等問題,其結果將分別為訊號帶來位元錯誤率的上升和鄰頻干擾等問題,也因而導致通訊系統效能的降低;正交分頻多工系統具有高頻寬效能及有效對抗多路徑干擾,也因此成為現今主要的無線通訊規格之一,但其與生俱來的高峰均功率比則會嚴重地影響到放大器的功率效能,為了能夠有效的解決這些問題,降低峰均功率比及功率放大器的線性化等技術便成為現今研究的焦點,功率放大器的線性化技術及降低訊號峰均功率比技術均可為功率放大器的功率使用效能提供良好的改進,同時也吸引了許多研究分別在這二方面進行,但同時將這二項技術合併使用和探討並不多見,在本篇論文中將會將這二項技術合併使用並對其效能及結果進行探討及分析,其中在降低訊號峰均功率比技術上採用metric based amplitude predistortion (MBAP) 或 phase reversal (PR)技術,而在功率放大器線性化方面則是使用memory polynomial predistorter (MPPD) 配合非直接學習架構 (indirect learning, IDL) 或是直接學習架構 (direct learning, DL)以及使用least square (LS) 及Least Mean Square(LMS)演算法,而在放大器方面則是分別使用Wiener 及Wiener-Hammerstein放大器模型,最後並將以total degradation (TD)來做系統的效能評估,最終模擬結果顯示,本篇論文中所提出的結合降低峰均功率比技術與多項式預扭器技術可以有效地改善系統的功率效能,且特別是當PR技術結合IDL預扭技術使用LMS演算法時可獲得最佳的效能。
Since the nonlinear effect caused by the High Power Amplifier (HPA), wireless communication system suffers from the in-band distortion and out-band emission. Orthogonal frequency division multiplexing (OFDM) scheme with high spectral efficiency and resistance to multi-path distortion has become a key modulation format in wireless communications. Its inherent high peak to average power ratio (PAPR) severely limits the power efficiency of the operating power amplifier. In addition to the PAPR problem, the power amplifier with nonlinear characteristic also restricts the power efficiency. In order to alleviate these drawbacks, PAPR reduction and PA linearization have both been extensively studied to deal with this important issue.
In this thesis, we propose a new approach which combines the metric based amplitude predistortion (MBAP) / phase reversal (PR) PAPR reduction scheme and memory polynomial predistorter (MPPD) with indirect learning (IDL) / direct learning (DL) architecture. A comparative study of performance of different combinations using Wiener power amplifier model / Wiener-Hammerstein power amplifier model is presented in terms of total degradation (TD). Simulation results indicate that our proposed combination approach can effectively improve the performance. In particular, MPPD using LMS algorithm with PR is the best one to the power efficiency
[1] Y. Kim, Y. Yang, S. H. Kang, and B. Kim, “Linearization of 1.85 GHz amplifier using feedback predistortion loop,” in IEEE MTT-S Int. Microwave Symp. Dig., Baltimore, MD, vol. 3, pp. 1675–1678, Jun. 1998
[2] Y. Y. Woo, Y. Yang, J. Yi, J. Nam, J. Cha, and B. Kim, “A new adaptive feedforward amplifier for WCDMA base stations using imperfect signal cancellation,” Microwave J., vol. 46, no. 4, pp. 22-44, Apr. 2003
[3] Seung Hee Han and Jae Hong Lee, “An overview of peak-to-average power ratio reduction techniques for multicarrier transmission,” IEEE Ttrans. on Wireless Communications, vol. 12,no. 2,pp. 56 – 65, April 2005.
[4] N. Dinur and D. Wulich, “Peak to average power ratio in amplitude clipped high order OFDM,” IEEE Military Communications Conference, vol. 2, pp.684 – 687, Oct. 1998.
[5] Xiaodong Li and L. J. Cimini, “Effects of clipping and filtering on the performance of OFDM,” IEEE 47th Vehicular Technology Conference, vol. 3,pp.1634 – 1638, 4-7 May, 1997.
[6] R. W. Bäuml, R. F. H. Fisher, and J. B. Huber, “Reducing the peak to average power ratio of multicarrier modulation by selected mapping,” Electronics Letters, vol.32, no. 22, pp. 2056-2057, Oct. 1996.
[7] S. H. Müller and J. B. Huber, “OFDM with reduced peak to average power ratio by optimum combination of partial transmit sequences,” Electronics Letters, vol. 33, no. 5, pp. 368-69, Feb. 1997.
[8] B. S. Krongold and D. L. Jones, “PAR reduction in OFDM via active constellation extension,” IEEE Trans. on Broadcasting, vol. 49, no. 3, pp.258-268, Sept. 2003.
[9] 錢柏君,”在正交分頻多工系統中基於間接和直接學習架構使用多項式預扭器之效能分析,”台灣科技大學碩士論文,2007
[10] A. A. M. Saleh, “Frequency-independent and frequency-dependent nonlinear models of TWT amplifiers,” IEEE Transactions on Communications, vol. COM-29, no. 11, pp. 1715-1720, Nov. 1981.
[11] S. Pupolin and L. J. Greenstein, “Performance analysis of digital radio links with nonlinear transmit amplifiers,” IEEE Journal on Selected Areas Communications, vol. 5, no. 3, pp. 534-546, Apr. 1987.
[12] J. Tsimbinos and K. V. Lever, ”Computational complexity of Volterra based nonlinear compensators,” IEEE Electronics Letters, vol. 32, no. 9, pp. 852-854, Apr. 1996.
[13] Raich, Raviv, “Nonlinear system identification and analysis with applications to power amplifier modeling and power amplifier predistortion,” Ph.D. Dissertation, Georgia institute of technology, March 2004.
[14] M. Schetzen, The Volterra and Wiener Theories of Nonlinear Systems. New York: Wiley, 1980.
[15] Kim, J. and Konstantinou, K., “Digital predistortion of wideband signals based on power amplifier model with memory," IEEE Electronics Letters, vol. 37, no. 23, pp. 1417-1418, Nov. 2001.
[16] Lei Ding, Zhou, G.T., Morgan, D.R., Zhengxiang Ma, Kenney, J.S., Jaehyeong Kim and Giardina, C.R.; “A robust digital baseband predistorter constructed using memory polynomials,” IEEE Transactions on Communications, vol. 52, no. 1,pp.159 – 165, Jan. 2004
[17] Gilabert, P., Montoro, G. and Bertran, E. “On the Wiener and Hammerstein models for power amplifier predistortion,” Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings, vol. 2, pp. 4 pp,4-7 Dec. 2005.
[18] Manne, G. K. and Yao, T. “On the predistortion technique for improving transmission linearity of OFDM system,” Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th, vol. 6, pp.3876 – 3879, Sept. 2004.
[19] 林彥言,”利用相位轉向技術以降低正交分頻多工系統的峰均功率比之研究.”, 台灣科技大學碩士論文,2008
[20] S. Sezginer and H. Sari, “Metric-based symbol predistortion techniques for peak power reduction in OFDM systems,” IEEE Transactions on Wireless Communications, vol. 6, no. 7, pp.2622 – 2629, July 2007