跳到主要內容

臺灣博碩士論文加值系統

(18.97.9.172) 您好!臺灣時間:2025/02/11 13:00
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:江翊綸
研究生(外文):Yi-Lun Chiang
論文名稱:IEEE802.11a無線區域網路系統模擬及效能分析
論文名稱(外文):Simulation and Performance Analysis of IEEE 802.11a WLAN system
指導教授:許超雲許超雲引用關係
指導教授(外文):Chau-Yun Hsu
學位類別:碩士
校院名稱:大同大學
系所名稱:電機工程學系(所)
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:英文
論文頁數:59
中文關鍵詞:無線區域網路系統
外文關鍵詞:IEEE 802.11a
相關次數:
  • 被引用被引用:0
  • 點閱點閱:175
  • 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:1
正交分頻多工(OFDM)是一種多載波的解調技術,且具有許多優點,例如高頻寬效益、高資料傳輸量、抗通道衰弱、抗脈衝干擾、較少非線性失真等等。
無線區域網路IEEE 802.11a 根據不同的通道品質提供6 Mb/s ~ 54 Mb/s
的資料傳輸速率供使用者選擇﹔於是,本論文針對IEEE 802.11a 的標準,進行實體層(Physical layer)部分之模擬,得到各種資料速率在AWGN以及band-limited channel的衰減通道下,位元錯誤率(BER)對訊號雜訊比(SNR)的關係研究結果。
WiMAX採用的調變及編碼技術都和802.11a相似¸我們可以進一步來修改目前建立的802.11a模擬環境來供WiMAX系統效能分析。
OFDM (Orthogonal Frequency Division Multiplexing) is a form of multi-carrier modulation technique. High spectral efficiency, robustness to channel fading, immunity to impulse interference, uniform average spectral density, capability of handling very strong echoes and less non linear distortion are among the favorite properties of OFDM.
The IEEE 802.11a Wireless Local Area Network (WLAN) provides several data rates from 6 Mb/s to 54 Mb/s according to different channel quality.
The aim of this thesis is to simulate the physical layer performance of the IEEE 802.11a system and to obtain the BER performance for various data rates in AWGN and band-limited channel channel.
In the further work, this test bed could be modifed to evaluate the performance of WiMAX system which uses the similar modulation and coding scheme as that in 802.11a system.
ACKNOWLEDGMENT I
ABSTRACT (in CHINESE) II
ABSTRACT (in ENGLISH) III
CONSTANT IV
LIST OF FIGURE VI
LIST OF TABLE VIII
CHAPTER 1 1
INTRODUCTION 1
1.1 Introduction 1
1.2 Research Motivation 2
CHAPTER 2 4
Principle of COFDM system 4
2.1 Basic Concepts of OFDM 4
2.1.1 Bandwidth Efficiency 4
2.1.2. System Diagram 6
2.1.3. Applications 7
2.2. Using IFFT to Generate Subcarriers 7
2.3. Guard Interval and Cyclic Prefix 10
CHAPTER 3 14
3.1 IEEE 802.11a system describing 14
3.2 Channelization 15
3.3.1 IEEE 802.11a systematic block diagram 17
3.3.2 Scrambling 18
3.3.3 Convolutional Coding 19
3.3.4 Data interleaving 20
3.3.5 Puncture 22
3.3.6 symbol Mapping 24
3.3.7 Implement IFFT 28
3.5 Channel Modeling 29
3.5.1 AWGN channel 29
CHAPTER 4 33
4.1 Introduction to simulink 33
4.2 IEEE 802.11a demos to simulink 34
4.3.3 General Block Interleaver block: 36
4.3.4 Rectangular QAM Modulator Baseband block: 37
4.3.5 Viterbi Decoder block: 38
4.4 IEEE 802.11a demos simulation result 39
4.4.1 Performance analysis with error-correcting system 40
4.4.2 Performance analysis with different channel 42
CHAPTER 5 48
CONCLUSIONS 48
REFERENCES 49
[1] R. van Nee and R. Prasad, OFDM for Wireless Multimedia Communications. 2000.
[2]Shelswell, P.,”The COFDM modulation system: The heart of digital broadcasting,” Electronic and Communication Engineering Journal, Vol7, June, pp. 127-135, (1995).
[3] ISO/IEC,”Information technology - generic coding of moving pictures a associated audio information: Part 2 video, ”Tech. Rep. 13818, ISO/IEC, (2000).
[4] IEEE Std. 802. 11a-1999, 30 Dec. 1999.
[5] L. J. Cimini. Jr,”Analysis and simulation of a digital mobile channel using orthogonal frequency division multiplexing,” IEEE Trans. Commun., vol. COM-33, no. 7, pp.655-675, July 1985.
[6]ETSI, “Radio Broadcasting Systems: Digital Audio Broadcasting to Mobile, Portable and Fixed Receivers,” European Telecommunication Standard, ETS 300-401, Feb. 1995.
[7]Tuttlebee, W. H. W., and D. A. Hawkins, “Consumer Digital Radio: From Concept to Reality,” Electronics and Communication Engineering Journal, Vol. 10, No. 6, pp. 263-276, Dec. 1998.
[8] R. Van Nee and R. Prasad, OFDM Wireless Multimedia Communications, Artech
House, Boston, 2000.
[9]ETSI, “Digital Video Broadcasting: Framing Structure, Channel Coding, and Modulation for Digital Terrestrial Television,” European Telecommunication Standard, EN 300-744, Aug. 1997.
[10]Reimers, U.,”DVB-T: The COFDM-Based System for Terrestrial Television,” Electronics and Communication Engineering Journal, Vol. 9, No. 1, pp. 28-32, Feb. 1997.
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top