跳到主要內容

臺灣博碩士論文加值系統

(18.97.14.86) 您好!臺灣時間:2025/02/12 22:05
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

我願授權國圖
: 
twitterline
研究生:王冠雄
研究生(外文):Guan-Hsiung Wang
論文名稱:應用於多輸入多輸出-正交分頻多工系統之調適子載波與位元配置機制
論文名稱(外文):Adaptive Subcarrier and Bit Allocation in MIMO-OFDM systems
指導教授:方文賢
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:電子工程系
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:2006
畢業學年度:94
語文別:中文
論文頁數:116
中文關鍵詞:調適子載波與位元配置通道狀態資訊空時編碼無限資源配置多載波調變多輸入多輸出正交分頻多工多使用者子載波配置位元載入調適調變
外文關鍵詞:wireless resource allocationadaptive modulationbit loadingmultiuser subcarrier allocationadaptive subcarrier and bit allocationCSIspace-time codingmulticarrier modulationMIMOOFDM
相關次數:
  • 被引用被引用:0
  • 點閱點閱:182
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
在實際的無線通道的環境下,通道常是時變的情形,不僅有通道衰耗的效應、其他非期望信號有意或無意的干擾,而且還有多路徑衰耗的問題存在。因此第四代無線通訊系統:正交分頻多工系統(OFDM)便能因應在未來的嚴苛無線通道環境。而多輸入多輸出(MIMO)系統不但能提供空間多工以提高資料率,更能提供空間分集並增加系統容量。本論文中便是結合OFDM的多項優點與應用MIMO的多項好處為基礎,結合成MIMO-OFDM系統。在MIMO-OFDM系統上,本論文的研討重點是利用在接收端能即時的偵測到無線通道參數,並且將這些參數經由回授通道(feedback channel)傳回基地台,根據這些回傳的的瞬時通道特性或參數來做動態調適子載波配置與位元配置,使得動態調適後傳送出的資訊能適應於無線通道的各種衰耗與不利條件,使無線使用者在相當高速移動的情況下能維持一定的QOS並且具有最小的總傳送功率。本論文提出的動態子載波與位元配置演算法經由電腦模擬與數學推導,證明了我們所提出的演算法適用各種通道環境。
本篇論文的主要貢獻在於:1.在無線的正交分頻多工系統中減少基地台的總傳送功率; 2.改進了多使用者的多輸入多輸出-正交分頻多工系統中的位元錯誤率; 3.本論文提出的演算法能適用於各種不同的無線通道,且效果經由電腦模擬出的效果顯示比其他多篇相關的國際期刊論文提出的方法效果更佳; 4.所提出的演算法符合“即時”、“高服務品質(high QOS)”、 “高速移動”、 “高資料率”的特點,適用於未來所需的高品質、高速移動、高資料量的無線傳輸環境。
With various attractive features, Multi-input Multi-output Orthogonal Frequency Division Multiplexing(MIMO-OFDM) has been a promise for fourth-generation wireless communication systems. This thesis focuses on the MIMO-OFDM that can detect wireless channel parameters in real time, and then transmit these parameters through the feedback channel to the base stations(BSs). According to these parameters, the BS carry out dynamic adaptation of subcarrier allocation and bit loading. As such, the transmit information can adapt to the wireless fadings, so that mobile users can maintain good quality of service(QOS) and minimize the total transmit power in high-speed environment. To achieve superior performance, a dynamic subcarrier and bit allocation algorithm is developed and verified through simulations using Matlab.
The main contribution in this thesis include : (1)Minimize the total transmit power in wireless OFDM systems; (2) Improve the bit error rate in Multiuser MIMO-OFDM systems; (3) Be able to apply to various wireless channels and outperform other previous works; (4) As a whole, the new algorithm provides an appealing alternative for future wireless environment.
第一章 序論 1
1.1 引言.................................................................... 1
1.2 研究動機 ……………..………………………… 3
1.3 內容章節概述 ……………………………………. 4
第二章 多輸入多輸出正交分頻多工系統 6
2.1 正交分頻多工基本原理……………………………….6
2.1.1 多載波調變 …………………………………....6
2.1.2 正交原理……………………………………...8
2.1.3 保護區間………………………………….….10
2.1.4 OFDM系統架構………………………………...13
2.1.5 OFDM優缺點………………………………......17
2.2 多輸入多輸出-正交分頻多工…………………...………19
2.2.1 多輸入多輸出原理……………………………....19
2.2.2 多輸入多輸出的發展與優點 …………………….....20


2.2.3 多輸入多輸出-正交分頻多工系統架構…………………22
2.3 多使用者多輸入多輸出正交分頻多工……………………..23
2.3.1 順向通道………………………………….….24
2.3.2 逆向通道…………………………………….24
2.4 無線正交分頻多工的實現與應用………………………...26
第三章 調適無線資源配置與管理 27
3.1 無線資源配置與調適...................................................27
3.1.1 無線資源配置問題……………………..………..28
3.1.2 調適技術介紹………………………………….29
3.1.3 通道參數量測………………………………….33
3.1.4 調適無限資源配置研究進程………………….…….35
3.2 位元載入………………………………………...36
3.2.1 位元載入演算法的實現………………………..….38
3.2.2 現有位元載入演算法介紹 ……………….………. .41
3.3 多使用者子載波配置………………………………..45
3.3.1 靜態配置…………………………………….45
3.3.1.1 分時多工存取配置……………………….....45


3.3.1.2 固定頻率群組子載波………………………..47
3.3.1.3 隨機跳頻子載波配置………………………..48
3.3.1.4 梳狀散佈子載波配置………………………..49
3.3.2 動態配置…………………………………….50
3.3.2.1 調適使用者配置與調適頻寬………………..…..50
3.3.2. 2 heruristic 即時子載波配置…...…………….…53
3.4 多使用者子載波與位元配置…………………………....56
第四章 功率最小化子載波與位元配置演算法 58
4.1 單使用者位元載入演算法……………………………...58
4.2 多使用者調適子載波與位元配置演算法……………….……73
4.3 模擬與討論…………………………..……………86
第五章 結論 101
附錄A 103
附錄B 112
參考文獻 114
[1] J. M. Cioffi, Lecture Notes for Advanced Digital Communications, Stanford, Fall, 1997
[2] J. G. Proakis, Digital Communication, New York: McGraw-Hill, 4th ed., 2001
[3] W. H. Sheen, Lecture Notes for Orthogonal Frequency Division Multiplexing,
Department of Communication Engineering, National Chiao Tung University
[4] Y. Wu and W. Y. Zou, “Orthogonal Frequency Division Multiplexing: A MultiC- arrier Modulation Scheme,”IEEE Transaction on Consumer Electronics, Vo- l .41 ,No.3, August 1995, pp.392-399
[5] A. Constantinides, A. Shacham, “MIMO Wireless Systems,”Online : http://www.columbia.edu/~acc40/MIMO.pdf, May 14, 2004
[6] C. Schlegel, “MIMO Channels and Space-Time Coding Lectures,”Online:
http://www.ece.ualberta.ca/~schlegel/Lectures.html
[7] T. S. RAPPAPORT, Wireless Communications, PH PTR, 2nd ed., 2002
[8] P. S. Chow, J. M. Cioffi, and John A.C. Bingham, “A Practical Discrete Mu- ltitone Transceiver Loading Algorithm for Data Transmission over Spectrally Shaped Channels,”IEEE Transactions on Communications, Vol. 43, pp. 773-775, No. 2, February 1995
[9] A. Wyglinski,“Physical Layer Loading Algorithms for Indoor Wireless Multi- carrier Systems,” PhD Thesis. November 2004
[10] B. SKLAR, Digital Communications, PH PTR, 2nd ed., 2002
[11] E. Lawrey, “MULTIUSER OFDM,”IEEE ISSPA `99, Brisbane, Australia, 22-25 August, 1999, pp.761-764
[12] J. Campello, “Discrete Bit Loading for Multicarrier Modulation Systems,” PhD Thesis. May 1999.
[13] Mohd Hairi bin Halmi and David Chieng Heng Tze, “Adaptive MIMO-OFDM Combining Space-Time Block Codes and Spatial Multiplexing,” IEEE ISSSTA20004, Sydney, Australia, 30 Aug.- 2 Sep. 2004


[14] J. Jang and K. B. Lee, “Transmit Power Adaptation for Multiuser OFDM Syst- ems, ” IEEE Journal on Selected Areas in Communications, vol. 21,. no. 2, pp. 171-178, Feb. 2003.
[15] W. Rhee and J. Cioffi, “Increase in capacity of multiuser OFDM system using dynamic subchannel allocation, ” in Proc. Vehicular Technology Conference (VTC), 2000, pp. 1085 -- 1089.
[16] G.. Zhang, “Subcarrier and bit allocation for real-time services in multiuser OFDM systems,” IEEE International Conference on Communications Volume 5, 20-24 June 2004 ,pp. 2985 - 2989 Vol.5
[17] W. Y. Zou and Y. Wu, “COFDM: An Overview,”IEEE Transactions on Broad- casting, Vol. 41, No 1, March 1995, pp. 1- 8
[18] S. B. Weinstein and P. M. Elbert, “Data Transmission by Frequency-Division Multi- plexing Using the Discrete Fourier Transform,”IEEE Transactions on Commu- nication Technology, Vol. COM-19, No. 5, October 1971m pp. 628- 634
[19] Z. Di, “Performance Analysis and Comparison of OFDM Based Packet Trans- mission System with QAM Modulation,”MS Thesis, April. 2004
[20] S. Ranvier, “Overview of MIMO systems”,Online: http://www.comlab.hut.fi/opetus/333/2004slides/topic47.pdf
[21] C. E. Shannon, “A mathematical Theory of Communication,”1949, Online:
http://www.math.psu.edu/gunesch/Entr7.opy/shannon.ps
[22] R. Bose, Information Theory, Coding and Cryptography, New York: Mcgraw-Hill, 2nd ed., 2003
[23] Z. Shen, J. G.. Andrews, and B. L. Evans, “Optimal power allocation in multiuser OFDM systems,” GLOBECOM 2003 - IEEE Global Telecommunications Conf- erence, vol. 22, no. 1, Dec 2003 ,pp. 337-341
[24] Y. J. Zhang and K. B. Letaief, “Optimizing power and resource management for multiuser MIMO/OFDM systems,” in Proc. IEEE GLOBECOM, pp. 179-183, San Francisco, USA, Dec. 2003.
[25] Y. J. Zhang and K. B. Letaief, “Multiuser subcarrier and bit allocation along with adaptive cell selection for OFDM transmission,” in Proc. IEEE ICC, pp. 861-865, New York, USA, April 2002.
[26] C. Y. Wong and R. S. Cheng, “Multiuser OFDM with Adaptive Subcarrier, Bit, and Power Allocation,” IEEE. Journal on Selected Areas in Communications, vol. 17, no. 10, Oct. 1999.



[27] T. L. Tung and K. Yao “Channel Estimation and Optimal Power Allocation for a Multiple Antenna OFDM System,” Eurasip Journal on Applied Signal Processing, Vol. 2002 (March 2002), pp. 330-339.
[28] E. Lawrey, “Adaptive Techniques for Multiuser OFDM,” PhD Thesis, December 2001.
[29] C. H. Chen, “Applications of MIMO and Adaptive Modulation in OFDM Syst- ems,” M.S. Thesis, June 2003
[30] Y. F. Chen, J. W. Chen, and C. P. Li, “A fast suboptimal sub- carrier, bit, and po- wer allocation algorithm for multiuser OFDM-based systems,” IEEE Commu- nications, 2004 IEEE International Conference on Volume 6, 20-24 June 2004 pp. 3212 - 3216 Vol.6
[31] Y. F. Chen, J. W. Chen, and C. P. Li, “A real-time joint subca- rrier, bit, and pow- er allocation scheme for multiuser OFDM-based systems,” IEEE VTC 2004 Spr- ing, Volume 3, 17-19 May 2004 ,pp. 1826 - 1830 Vol.3
[32] C. Mohanram and S. Bhashyam, “A sub-optimal joint subcarrier and power allo- cation algorithm for multiuser OFDM,” IEEE Communications Letters, Volume 9, Issue 8, Aug. 2005, pp. 685 – 687
[33] Y. J. Zhang and K. B. Letaief, “An efficient resource-allocation scheme for spat- ial multiuser access in MIMO/OFDM systems,” IEEE Transactions on Commun- ications,Vo. 53, Issue 1, Jan 2005 , pp. 107 – 116
[34] C. Pan, Y. Cai, and Y. Xu, “Adaptive subcarrier and power allocation for multi- user MIMO-OFDM systems,” IEEE International Conference on ICC, Vol. 4, 16-20 May 2005, pp.2631 - 2635 Vol. 4
[35] M. Ergen, S. Coleri, and P. Varaiya , “QoS Aware Adaptive Resource Allocation Techniques for Fair Scheduling in OFDMA Based Broadband Wireless Access Systems,” IEEE Transactions on Broadcasting, vol.49, no.4, pp.362-370, Decem- ber 2003
[36] A. Seyedi and G. J. Saulnier , “Robust Bit-Loaded Wireless OFDM,”IEEE VTC 2004, pp. 593-597.
[37] J. Campello, “Practical bit loading for DMT,”IEEE ICC'99 Proceedings, June 1999, Vancouver, pp. 801-805.
[38] S. T. Chung and Andrea J. Goldsmith, “Degrees of Freedom in Adaptive M- odulation : A Unified View,” IEEE Transactions on Communications, Vol. 49, No.9, Sept- ember 2001
[39] E. Larsson and G. Storica, Space-time block coding for wireless communications, Cambridge press, 2003
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top