研究生: |
溫振宇 Chen-yu Wen |
---|---|
論文名稱: |
降低LTE-A上行載波聚合系統峰均功率比之研究 Study of PAPR Reduction for Uplink Carrier Aggregation Systems in LTE-A |
指導教授: |
張立中
Li-chung Chang |
口試委員: |
劉馨勤
Hsin-chin Liu 曾德峰 Der-feng Tseng |
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: | 2014 |
畢業學年度: | 102 |
語文別: | 中文 |
論文頁數: | 62 |
中文關鍵詞: | 載波聚合 、單載波分頻多重存取 、長期演進進階版 、峰均功率比 |
外文關鍵詞: | Carrier Aggregation, SC-FDMA, LTE-A, PAPR |
相關次數: | 點閱:264 下載:0 |
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 |
為了得到更高的資料傳輸速率需要更高的頻寬,因此在第三代合作夥伴計劃(3GPP)的長期演進進階版(LTE-A)中,提出了載波聚合(Carrier Aggregation)技術,利用聚合長期演進技術(LTE)的載波提升頻寬,達到高資料傳輸速率的目的。由於單載波分頻多重存取(SC-FDMA)擁有低峰均功率比(PAPR)的特性,在長期演進技術及進階版(LTE/LTE-A)採用單載波分頻多重存取(SC-FDMA)技術為上行鏈路的方案,不過隨著聚合越多的載波,除了複雜度會升高之外,也會導致系統峰均功率比(PAPR)的上升,使得原本單載波分頻多重存取(SC-FDMA)擁有低峰均功率比(PAPR)的特性被打破。此外,在聚合相同頻寬系統下,不同的載波組合也會有不同的PAPR,因此在研究上,首先將原先只針對兩個分量載波的探討擴充在聚合4、5個分量載波總頻寬為60M、80M、以3個符元(兩個資料符元、一個參考符元)為最佳化區間,找出使用部分選擇映射法(PSLM)降低峰均功率比(PAPR)效能最好的分量載波(CCs)組合,接下來在最好的分量載波組合下,提供不同最佳化區間PAPR效能及複雜度的選擇,最後我們提出一個與部分選擇映射法(PSLM)法降低相同PAPR效能但是複雜度較低的方法。
In order to obtain higher data rates, require lager bandwidths. Thus, Third Generation Partnership Project Long Term Evolution Advanced (3GPP-LTE-A) proposed carrier aggregation (CA) technology to utilize aggregation of Long Term Evolution (LTE) carrier to enlarge the bandwidth and achieve high data rate. Since SC-FDMA has a low peak to average power ratio (PAPR) characteristic, it has been proposed for the 3GPP-LTE/LTE-A uplink scheme. However, aggregate more carriers not only increases complexity but also raises the PAPR, thus the inherent lower PAPR property of the SC-FDMA does not exist anymore. In addition, combinations of different carriers may have different PAPRs under the same bandwidth aggregation system. In this research, we extend previous analysis to first find out the best PAPR performance by using partial selected mapping (PSLM) scheme from different combinations of component carriers (CCs) in the total aggregated four or five CCs systems with bandwidth 60MHz and 80MHz using three symbol (two data symbol, one reference symbol) optimal interval. We then provide tradeoffs between PAPR and complexity depending on different selection of the optimal interval. Finally, we proposed a scheme to reduce the PAPR with the same performance of the PSLM scheme but it has a lower computational complexity.
[1] Y. Pochun, H. Minn, and C. Chia-Chin, "PAPR reduction for bandwidth-aggregated OFDM and SC-FDMA systems," in Wireless Communications and Networking Conference (WCNC), 2011 IEEE, 2011, pp. 1363-1368.
[2] 3GPP TR 36.913: "Requirements for further advancements for Evolved Universal Terrestrial Radio Access (E-UTRA) (LTE-Advanced)," Release 9, Dec. 2009.
[3] 3GPP TR 25.814: "Technical Specification Group Radio Access Network; Physical layer aspects for evolved Universal Terrestrial Radio Access (UTRA)," Release 7, Sep 2006.
[4]3GPP. Available: http://www.3gpp.org/technologies/keywords-acronyms/97-lte-advanced
[5] Hyung G. Myung, David J. Goodman, Single Carrier FDMA A NEW Air Interface for Long Term Evolution, WILEY, December 2008.
[6] R. Ratasuk, D. Tolli, and A. Ghosh, "Carrier Aggregation in LTE-Advanced," in Vehicular Technology Conference (VTC 2010-Spring), 2010 IEEE 71st, 2010, pp. 1-5.
[7] S. H. Han, and J. H. Lee, "An overview of peak-to-average power ratio reduction techniques for multicarrier transmission," Wireless Communications, IEEE, vol. 12, pp. 56-65, 2005.
[8] N. Dinur and D. Wulich, "Peak to average power ratio in amplitude clipped high order OFDM," in Military Communications Conference, 1998. MILCOM 98. Proceedings., IEEE, 1998, pp. 684-687 vol.2.
[9] L. Xiaodong and L. J. Cimini, "Effects of clipping and filtering on the performance of OFDM," Communications Letters, IEEE, vol. 2, pp. 131-133, 1998.
[10] R. W. Bauml, R. F. H. Fischer, and J. B. Huber, "Reducing the peak-to-average power ratio of multicarrier modulation by selected mapping," Electronics Letters, vol. 32, pp. 2056-2057, 1996.
[11] S. H. Muller and J. B. Huber, "OFDM with reduced peak-to-average power ratio by optimum combination of partial transmit sequences," Electronics Letters, vol. 33, pp. 368-369, 1997.
[12] S. H. Muller and J. B. Huber, "A comparison of peak power reduction schemes for OFDM," in Global Telecommunications Conference, 1997. GLOBECOM '97., IEEE, 1997, pp. 1-5 vol.1.
[13] B. S. Krongold and D. L. Jones, "PAR reduction in OFDM via active constellation extension," Broadcasting, IEEE Transactions on, vol. 49, pp. 258-268, 2003.
[14] K. Liu and N. Xu, "PAPR reduction of uplink for carrier aggregation in LTE-Advanced," in Information Science and Engineering (ICISE), 2010 2nd International Conference on, 2010, pp. 2224-2226.
[15] M. Yan, S. Gang, Z. Wu, J. Qi, T. Yanbo, S. Huan, et al., "PAPR reduction with multiple antennas transmission for carrier aggregation," in Personal Indoor and Mobile Radio Communications (PIMRC), 2012 IEEE 23rd International Symposium on, 2012, pp. 615-619.
[16] 3GPP TS 36.211: "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation," Release 9, Dec. 2009.
[17] W. Li, W. Gang, D. Lilin, and X. Yue, "A Time-Domain PTS without Side Information in SC-FDMA Systems," in Wireless Communications, Networking and Mobile Computing (WiCOM), 2011 7th International Conference on, 2011, pp. 1-4.