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研究生:陳正穎
研究生(外文):Jeng-Ying Chen
論文名稱:低密度同位檢查碼之正交分頻多工水下通道傳輸
論文名稱(外文):A LDPC Coded OFDM System for Underwater Acoustic Channel Communication
指導教授:陳建宏陳建宏引用關係
指導教授(外文):Jian-Hong Chen
口試委員:洪志宗楊世任
口試委員(外文):Chih-Tsung HungShih-Jen Yang
口試日期:2012-07-16
學位類別:碩士
校院名稱:聖約翰科技大學
系所名稱:電子工程系碩士班
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:2012
畢業學年度:100
語文別:中文
論文頁數:58
中文關鍵詞:低密度同位檢查碼水下通道正交分頻多工
外文關鍵詞:UWALDPCOFDM
相關次數:
  • 被引用被引用:0
  • 點閱點閱:96
  • 評分評分:
  • 下載下載:6
  • 收藏至我的研究室書目清單書目收藏:0
水下通訊是研究海洋科學重要的關鍵之一。其中尤其以淺水熱帶暖水域區域變化最為劇烈。此通道存在兩種重要水下通道特性 -大規模的時變多路徑,以及非高斯型環境雜訊 (non-Gaussian ambient noise),目前水下通訊傳輸大多使用聲波。但因為水下傳輸聲波的速度慢,延遲嚴重。在本文中,我們使用 [1] 中的水下通道模型,並且根據水下通道模型中劇烈時變產生的都普勒效應,再輔以正交分頻多工技術(Orthogonal Frequency DivisionMultiplexing;OFDM )架構來提升資料傳輸速率,以及 對 抗 多 路 徑 傳 輸 所 產 生 的 符 元 間 干 擾( Inter-Symbol Interference;ISI)及水下通道干擾,加入低密度位元檢查編碼 ( Low-Density Parity-Check Code ; LDPC code)解決OFDM中的PAPR 過高的問題,以及時變通道中的都普勒效應。使得水下傳輸時能有更高的傳輸速率及較低的錯誤率。

Underwater acoustic communication is a core of oceanography . This channel has exhibited two kinds of important characteristic such as extensively time-varying multipath and high level non-Gaussian ambient noise. At presented underwater acoustic channel communication transmission, acoustic wave is the best choice by its characteristic which is hard to absorb in water. In this paper, we use the underwater acoustic channel model[1] and then orthogonal frequency division multiplex (OFDM) motes the data rate, as well as resists inter-Symbol Interference (ISI) which occurred in multipath transmission. We use Low-Density Parity-Check Code (LDPC code) to solve Doppler spread which occurred by time-varying channel, and the effect caused the higher data rate and lower error probability.
目錄
論文摘要 Ⅰ
Abstract II
誌謝 III
目 錄 IV
圖 目 錄 VI
表 目 錄 VIII
第一章 介紹 1
1.1 研究動機與目的 1
 1.2 論文大綱 2
第二章 水下通道 3
 2.1  無線通道特性 3
 2.2  水下通道簡介 7
 2.3 水下通訊系統的特性 9
 2.4  水下通道架構 13
第三章 正交分頻多工系統 18
 3.1  OFDM發展與簡介 18
 3.2  OFDM系統架構 19
 3.3  保護區間與循環字首 21
 3.4  OFDM系統的優缺點 23
3.5  OFDM的數學模型 24
第四章 低密度同位元檢查碼 26
4.1  線性區塊碼 26
4.2  LDPC code起源與發展 27
4.3  LDPC code的架構 28
    4.3.1 Tanner graph 33
 4.4  LDPC code編碼 35
 4.5  LDPC code解碼 36
    4.5.1 訊息傳遞演算法 37
    4.5.2 和積演算法解碼 38
第五章 模擬與結果 45
 5.1  系統模擬參數表 45
 5.2  模擬結果與效能分析 47
 5.3  結論 53
第六章 結論與未來研究方向 54
參考文獻 55


[1 ]. Chitre M.“A high-frequency warm shallow wateracoustic Communicati-
ons channel model and measurements,” J. Acoust Soc. America, 2007
[2]. M. Stojanovic “ Recent Advances in High-Speed Underwater Acoustic Communications”IEEE Journal of Oceanic Engineering, vol. 121, No.2 , April 1996, pp. 125-136.
[3]. Gallager R, “Low-density parity-check Codes Information,” IRE Transactions on Theory Volume: 8 , Issue: 1
[4]. Tanner R,“A recursive approach to low complexity codes Information Theory,” IEEE Transactions Informmation Theory , Vol. 27 , pp. 533 -547 , Sept. 1981
[5]. MacKay, D.J.C.; Neal, R.M“Near ShannonLimit Performance of Low Density Parity Check Codes,” Electron. Lett., Vol 32, no. 18, pp. 1645 -1646, Aug. 1996
[6]. N. Wiberg, “Codes and Decoding on General Graphs,” Linking on Studies in Science and Technology, Dissertation No.440 Linkoping University, -Linkoping, Sweden, 1996.
[7]. T. J. Richardson, A. Shokrollahi, and R. L. Urb anke, “Design of provably good low-density parity-check codes,” in Proc. IEEE Int. Symp . Information Theory, 2000, p. 199
[8]. M. Stojanovic, J. A. Catipovic, and J. G. Proakis ,“Adaptive multi channel combining and equalization for underwater acoustic communications,”J. Acoust. Soc. America, vol . 94, pp. 1621-1631, 1993.
[9]. Brekhovskikh, L. M., and Lysanov, Y. 1991 .Fundamentals of Ocean Acoustics, 2nd ed. Springer, Berlin.
[10]. S. B. Weinstein and P. M. Ebert,“Data transmission by Frequency division multiplexing using the discrete Fourier transform,”IEEE Rans. on Comm. Tech., vol. 19, pp. 628-634, Oct. 1971.
[11]. B. Hirosaki. “An Analysis of Automatic Equalizer for Orthogo-
nally Multiplexed QAM Systems,” IEEE Trans. Comm. ,COM-28, pp. 73-83, 1980
[12]. M. X. Chang and Y. T. Su, “Model-based Channel Estimation for OFDM Signals in Rayleigh Fading,” IEEE Trans. Comm., Vol. 50, no. 4, pp. 540-544, April 2002.
[13]. T. J. Richardson and R. L. Urbanke,“Efficient encoding of low-density parity-check codes,”IEEE Trans. Inform. Theory, vol. 47, pp. 638-656, Feb. 2001
[14]. Kim, A. Ramamoorthy, and S. W. Mclaughlin“Design of Efficiently-Encodable Rate-Compatible Irregular LDPC Codes,”,Proc. Of ICC06, pp. 1131-1136, Jun. 2006.
[15]. Pusane,A.E., Smarandache, R., Vontobel,P.O., Costello, D.J.“Deriving Good LDPC Convolutional Codes from LDPC Block Codes, ”Information Theory, IEEE Transactions ,on page(s) : 835 - 857
Volume: 57, Issue: 2, Feb. 2011
[16]. Capirone, D.; Como, G.; Fagnani, F.; Garin, F.,“Nonbinary decoding of structured LDPC codes,”Communications, 2008 IEEE International Zurich Seminar on, On page(s): 68 – 71
[17]. A. Stefanov and M.Stojanovic,“Design and Performance Analysis of Underwater Acoustic Networks,”IEEE Journal on Selected Areas in Communications (JSAC), Special Issue on Advances in Military
Communications and Networking, to appear
[18]. K. Tuy, D. Fertonani, T. Duman, M. Stojanovic, J. Proakis and P. Hursky,“`Mitigation of Intercarrier Interference for OFDM over Time-Varying Underwater Acoustic Channels,”IEEE Journal of Oceanic Engineering, vol. 36, No. 2, April 2011, pp. 156-171.
[19]. G Rojo and M. Stojanovic,“Peak-to-Average Power Ratio (PAR) Reduction for Acoustic OFDM Systems,”Marine Technology Society Journal, vol. 44, No. 4, July/August 2010, pp. 30-41.
[20]. B Li, S. Zhou, M. Stojanovic, L. Freitag and P. Willet, “Multicarrier Communications over Underwater Acoustic Channels with Non-uniform Doppler Shifts,”IEEE Journal of Oceanic Engineering, vol. 33, No. 2, April 2008, pp. 198-209.
[21]. Chitre M., Shahabudeen, S., Freitag, L., M., Stojanovic,“Recent
advances in underwater acoustic communications & networking,”OCEANS 2008, On page(s): 1 - 10
[23]. J. G. Prokis, Digital Communication,1995
[24]. William S. Burdic,“Underwater acoustic system analysis,”2nd Ed.,Prentice-Hall 1991.
[25]. MacKay, D. J. C.; Wilson, ST.; Davey, M. C.“Comparison of constructions of irregular Gallager codes,”IEEE Transactions on Communications, Volume: 47, Issue: 10, Oct. 1999, Pages:1449 - 1454
[26]. Sae- Young Chung, Richardson , T. J. , Urbanke, R. L.“Analysis sum-product decoding of low-density parity-check codes using a Gaussian approximation”IEEE Transactions on Information Theory, Volume: 47, Issue: 2, Feb 2001, Pages:657 - 670
[27]. C. Berrou, A. Glavieux, and P. Thitimasjshima,“Near Shannon Limit Error-Correcting Coding and Decoding: Turbo-codes (1)”Proceedings of the IEEE International Conference on Communications, pp. 1064 -1070,1993
[28]. 鄭仲廷,“輔以低密度同位檢查編碼之多頻帶正交分頻多工超寬頻系統,”聖約翰科技大學自動化及機電整合研究所, 2004年,碩士論文.
[29]. 翁世才,“淺海域之水下通道估測,”國立臺灣海洋大學電機工程學系, 碩士論文, 2004年,.

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