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姓名 程柏綸(Po-lun Cheng) 查詢紙本館藏 畢業系所 資訊工程學系 論文名稱 在HSDPA 下合適的控制調變編碼技術
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摘要(中) 第三代行動通訊發展至今,Wideband CDMA(WCDMA)為其中廣受看好的一項air 端介面控制存取技術標準,在當前的3GPP release 99,第三代行動通訊傳輸速率能達到384Kbps 至2Mbps。不過科技在進步,人的需求在增加,WCDMA Evolved 成為大家致力的目標,描述如何使終端的使用者能有更好的品質和簡化,系統能達到更有效率和更大的負載量。適應性調變編碼技術(AMC)能根據當前的通道狀況和系統限制,使用適合當前環境的調變和編碼,在UE 通訊情況好時,AMC 分配高等級和高速率的編碼給這個UE,反之則使用低等級和低速率的編碼,達到提升速率和節省能源。而如何依據當前的通道狀況和系統限制,使用適合當前環境的調變和編碼,就是一個重要的問題。我們提出一個簡單的方式,來使得系統能夠使用適合當前環境的調變和編碼,提高傳輸量和縮短延遲時間。實驗結果顯露出我們提出的方法的確可以在第三代行動通訊網路下有效地使效能顯著的提升。 摘要(英) With the development of 3G, today the Wideband CDMA (WCDMA) is a widely accepted air interface technique. The WCDMA 3GPP Release99 provides data rates of 384 Kbps for wide area coverage and up to 2 Mbps for hot-spot areas. But the more we demand when technique has progressed.WCDMA Evolved had brought up, which describes the evolution of WCDMA addressing both operators need for efficiency and end-users demand for enhanced experience and simplicity. Adaptive modulation and coding (AMC) is a radio link adaptation technique where the modulation level and coding method are varied according to the channel quality, the higher quality of UE can be served with higher modulation level and faster coding rates, such as 16QAM and 3/4 rate, to achieve higher peak rates. On the contrary, lower quality of UE can be served with lower modulation level and slower coding rates, such as QPSK and 1/4 rate. How to according to the channel quality and select suitable Adaptive modulation and coding is very important thing. we proposal a simple way to according to the channel quality and select suitable Adaptive modulation and coding. And then, the throughput became higher and delay became shorter. Simulation experiments reveal that our scheme gives prominence to improve performance effectively over 3G networks. 關鍵字(中) ★ 第三代行動通訊
★ 預測關鍵字(英) ★ predicted
★ HSDPA論文目次 Abstract ii
Table of Contents iv
List of Tables vi
List of Figures vii
1 Introduction 1
1.1 HSDPA Background . . . . . . . . . . . . . . . . . . 1
1.2 Adaptive Modulation and Coding . . . . . . .. . . . . 4
1.3 SNRBLERMatrix . . . . . . . . . . . . . . . . . . . . 6
1.4 Contribution of the thesis . . . . . . . . . . . . . 11
1.5 Thesis organization . . . . . . . . . . . . . . . .. 11
2 Related Work 13
2.1 Link-Level Performance Indicators for HSDPA
Network-Level Simulations . . . . . . . . . . . . . .. . 13
2.1.1 HSDPA LINK-LEVEL RESULTS . . . . . . . . 13
2.1.2 ANALYTICAL MODEL FOR BLOCK ERRORS 15
2.2 Optimizing the mapping between SINR and MCS . . . 17
2.2.1 OPTIMIZING THE MAPPING BETWEEN
SINR AND MCS . . . . . . . . . . . . . . . . . 17
2.3 Proposed Threshold Controlling Scheme According to
CRC Results . . . . . . . . . .. . . . . . . . . . . . . 21
3 Proposed Scheme 27
4 Experimental Results 29
4.1 Differnet envioremnment throughput comparison . . . 29
4.2 Velocity change . . . . . . . . .. . . . . . . . . . 31
4.3 intra interference change . . . . . . . . . . . .. . 32
4.4 Tcp average throughput performance . . . . . . . . . 32
4.5 Udp delay performance . . . . . . . . . . . .. . . . 33
4.6 Tcp delay performance . . . . . . . . . . . . . . . 34
5 Conclusion and Future Work 37
List of References 38參考文獻 [1] J. Krause, ”High speed downlink packet access:Iub/iur protocol”, 3GPP Specification (release 5), June 2002.
[2] Zhao Haichuan, ”Implementation and simulation of HSDPA functionality with ns-2”, Linkoping, March 21 2005.
[3] 3GPP TS 25.214 V5.5.0, Physical layer procedures (FDD), Release5.
[4] Frank Brouwer, ”Usage of Link-Level Performance Indicators for HSDPA Network-Level Simulations in E-UMTS”, Spread Spectrum Techniques and Applications,IEEE, 2004.
[5] N. Miki, H. Atarashi, S. Abeta, and M. Sawahashi, ”Comparison of hybrid ARQ schemes and optimization of key parameters for highspeed packe transmission in W-CDMA forward link”, IEICE Trans. Fundamentals, vol.E84-A, no.7, pp.1681V1690, July 2001.
[6] Daisuke TAKEDA, Yuk C CHOW, Paul STRAUCH, and Hiroshi
TSURUMI, ”Threshold Controlling Scheme for Adaptive
Modulation and Coding System”, IEICE Transactions on Communications,2006.
[7] ”ns-2 simulator” http://www.isi.edu/nsnam/ns.
[8] SEACORN project, http://seacorn.ptinovacao.pt/.
[9] H Zheng, H Viswanathan,”Optimizing the ARQ Performance in Downlink Packet Data Systems With Scheduling”,Wireless Communications, IEEE Transactions on,Volume: 4, Issue: 2,2005.
[10] G. Benelli, An ARQ scheme with memory and soft error detectors,IEEE Trans. Commun., vol. COM-33, no. 3, pp. 285V288,Mar. 1985.
[11] D. Chase, Code combiningXA maximum likelihood decoding approach for combining an arbitrary number of noisy packets, IEEETrans. Commun., vol. 33, no. 5, pp. 385V393, May 1985.
[12] M. Zorzi and R. R. Rao, On the use of renewal theory in the analysis of ARQ protocols, IEEE Trans. Commun., vol. 44, no.9, pp. 1077V1081, Sep. 1996.
[13] QWang, J Xu, D Xu, Z Bu, A novel mapping criterion scheme for MCS selection in CDMA based HARQ systems, Wireless Communications,Networking and Mobile Computing, 2005.
[14] T. Asai, K. Higuchi, and M. Sawahashi, ”Experimental evaluations on throughput performance of adaptive modulation and channel coding and hybrid ARQ in HSDPA,” IEICE Trans. Fundamentals,vol.E86-A, no.7, pp.1656V1668, July 2003.
[15] J. Lee, R. Arnott, K. Hamabe, and N. Takano, Adaptive modulation switching level control in high speed downlink packet access transmission, IEE 3G Mobile Communication Technology Conference,May 2002.
[16] A. Dogandzic and J. Jinghua, ”Estimating statistical properties of MIMO fading channels,” Signal Processing, IEEE Transactions on, vol. 53, no. 8, pp. 3065-3080, Aug. 2005.
[17] T. L. Marzetta, ”EM algorithm for estimating the parameters of a multivariate complex Rician density for polarimetric SAR,”in Acoustics, Speech, and Signal Processing, 1995. ICASSP-95,1995, vol. 5, pp. 3651-3654.
[18] EURANE (Enhanced UMTS Radio Access Networks Extensions
for ns-2),http://www.ti-wmc.nl/eurane/.指導教授 吳曉光(Hsiao-kuang Wu) 審核日期 2007-7-19 推文 plurk
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