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姓名 胡智明(Chih-Ming Hu) 查詢紙本館藏 畢業系所 通訊工程學系在職專班 論文名稱 正交分頻多工接取系統之細胞間干擾降低研究
(Inter Cell Interference mitigation in OFDMA cellular system)相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 隨著無線通訊的快速發展,使用者對於無線傳輸的需求及品質的要求日益提升。OFDMA通信技術目前是最有可能成為下一代的移動通信系統,然而,在此系統下,細胞間干擾(Inter cell interference)的問題仍是影響傳輸品質與系統容量的因素,尤其是在細胞邊緣的用戶更是明顯。因此,如何改善細胞邊緣用戶及整體細胞的傳輸速率是本論文所要研究與探討的課題。
目前,已有多個文獻在探討如何降低細胞間干擾的問題。本論文中,我們提出彈性式柔性頻率重用,並且藉由調整頻率重用因子、功率分配及封包排程優先權,來改善細胞邊緣用戶的傳輸率。在我們模擬的數據結果顯示,我們的方法可有效增加細胞邊緣用戶之傳輸速率。
摘要(英) With the fast development of the wireless communications, the requirement of faster transmission rate has also increased rapidly. The OFDMA technology is considered as a promising candidate for the downlink interface of the next generation wireless systems. However, inter cell interference is an impediment of the throughput performance in the system, especially for Cell Edge Users(CEUs).The main goal is to improve the CEU throughput as well as overall cell throughput.
In this thesis, we propose a flexible softer frequency reuse scheme. Several schemes on inter cell interference coordination have been suggested for OFDMA systems. Our algorithm is designed to improve the CEU throughput by optimizing the reuse factor、power factor and packet scheduler priority. From the simulation result, the proposed algorithm can increase the CEU throughput effectively.
關鍵字(中) ★ 頻率重用
★ 細胞間干擾關鍵字(英) ★ inter cell interference
★ OFDMA
★ frequency reuse論文目次 論文摘要 i
Abstract ii
致 謝 iii
目 錄 iv
圖 目 錄 vi
表 目 錄 ix
第一章 緒 論 1
1-1 研究背景 1
1-2 研究動機 1
1-3 章節概要 3
第二章 OFDMA系統與LTE簡介 4
2-1 OFDM基本架構 4
2-2 OFDMA基本架構 6
2-3 LTE簡介 8
2-3-1 LTE傳輸架構 8
2-3-2 LTE系統架構 10
第三章 頻率重用指配法 13
3-1 部分頻率重用PFR (Partial Frequency Reuse) 15
3-2 軟性頻率重用SFR (Soft Frequency Reuse) 17
3-3 柔性頻率重用SerFR (Softer Frequency Reuse) 18
3-4 彈性式柔性頻率重用Flexible Softer Frequency Reuse 21
第四章 資源分配演算法 27
4-1 資源分配演算法 27
4-2 改良式資源分配演算法 28
第五章 模擬結果與分析 37
5-1模擬環境及參數設定 37
5-1-1系統架構與參數設定 37
5-1-2傳播通道 39
5-2系統效能比較 40
5-2-1系統容量比較 40
5-2-2 Outage rate與Forced termination rate比較 43
5-2-3 Residual PER比較 47
5-2-4 Throughput比較 48
第六章 結論與未來研究 54
參考文獻 55
參考文獻 [1]Siemens,“Interference Mitigation by Partial Frequency Reuse”, 3GPP TSG-RAN WG1 Meeting #44, R1-060670,February 2006.
[2]Huawei, “Soft Frequency Reuse Scheme for UTRAN LTE”, 3GPP TSG RAN WG1 Meeting #41, R1-050507, May 2005.
[3]Xunyong Zhang, Chen He, Lingge Jiang, Jing Xu,“Inter-cell Interference Coordination Based on Softer Frequency Reuse in OFDMA Cellular Systems”, IEEE Int. Conference Neural Networks & Signal Processing, pp. 270-275, 8~10 June, 2008.
[4]3GPP Technical Report 25.814, version 7.1.0,“Physical layer aspects for evolved Universal Terrestrial Radio Access (UTRA)”, September 2006.
[5]Harri Holma,Antti Toskala, “LTE for UMTS- OFDMA and SC-FDMA Based Radio Access”, Wiley, June 2009.
[6]Rahman M, Yanikomeroglu H, Wong W, “Interference Avoidance with Dynamic Inter-Cell Coordination for Downlink LTE System”, Wireless Communications and Networking Conference, 2009. WCNC 2009. IEEE, pp. 1-6, April 2009
[7]Y. Xiang, J. Luo, C. Hartmann, “Inter-cell Interference Mitigation through Flexible Resource Reuse in OFDMA based Communication Networks”, in Proc. European Wireless 2007, pp. 1-7, April 2007.
[8]Bin Fan,Yu Qian; Kan Zheng,Wenbo Wang, “A Dynamic Resource Allocation Scheme Based on Soft Frequency Reuse for OFDMA Systems”, Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, pp. 1-4,Aug 2007.
[9]Fujii, H,Yoshino,H, “Theoretical Capacity and Outage Rate of OFDMA Cellular System with Fractional Frequency Reuse”;Vehicular Technology Conference, 2008. VTC Spring 2008. IEEE, pp. 1676-1680,May 2008.
[10]Shinsuke Hara, Ramjee Prassd, “Multicarrier Techniques for 4G Mobile Communications”;Artech House, 2003.
[11]R.van Nee,R.Prasad, “OFDM for Wireless Multimedia Communications”;Artech House, 2000.
[12]Hiroshi Harada, Ramjee Prasad, “Simulation and Software Radio for Mobile Communications” Artech House, 2002
[13]Stefania Sesia,Issam Toufik,Matthew Baker “LTE, The UMTS Long Term Evolution: From Theory to Practice” John Wiley, 2009
[14]Khedr M, El-Rube I, Hanafy Y, Abou-zeid H“Subcarrier opportunistic proportional fair scheduling for OFDMA systems”; 4th IEEE/IFIP International Conference on 23~25 Sept 2008, pp. 1-5.
[15]Zheng Xie; Walke, B.; “Enhanced Fractional Frequency Reuse to Increase Capacity of OFDMA Systems”, IEEE Conferences, pp. 1-5,20~23 Dec 2009.
指導教授 陳永芳(Yung-Fang Chen) 審核日期 2010-7-2 推文 plurk
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