博碩士論文 etd-1123113-231950 詳細資訊


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姓名 郭妍希(Yen-Hsi Kuo) 電子郵件信箱 E-mail 資料不公開
畢業系所 電機工程學系研究所(Electrical Engineering)
畢業學位 碩士(Master) 畢業時期 102學年第1學期
論文名稱(中) 在叢集錯誤的WSN使用RS Code以提高封包正確率的交錯演算法
論文名稱(英) An Interleaving Algorithm using RS Code for Increasing Packet Reliability in Burst-Error WSN
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    紙本論文:1 年後公開 (2014-12-23 公開)

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    論文語文/頁數 中文/86
    統計 本論文已被瀏覽 5062 次,被下載 171 次
    摘要(中) 由於在WSN環境中傳送封包可能會因為距離比較遠或訊號受到干擾導致封包出錯而必須重傳,使得網路的負載增加,本論文在樹狀結構的WSN下提出封包交錯編碼演算法(Packet Interleaving Algorithm, PIA)。首先,我們先依據資料的特性將封包分為高可靠度要求(High Reliability Request, HRR)與低可靠度要求(Low Reliability Request, LRR)。在Reed-Solomon (RS) Code中原始資料會依據符號長度做切割,HRR封包使用較短長度的符號編碼,而LRR封包使用較長長度的符號編碼,以提高傳送封包的可靠度。接著,我們在樹狀結構的WSN下,將HRR封包與LRR封包傳送到上一層的Sensor做交錯排列,使得在Burst Error (BE)產生時錯誤可以被分散到HRR與LRR的封包中,讓HRR封包中的錯誤下降至可以被更正的範圍內。最後,我們利用Uniform Bit Error Model (UBEM)和On-off Bit Error Model (OBEM)兩種數學模型分析在有無使用PIA時封包不能被更正的機率,我們分析發生BE時不同長度的連續位元錯誤對HRR封包與LRR封包不能被更正機率的影響,接著,改變BE週期的開始與封包第一個位元的位移(Shift),分析不同位移對HRR封包與LRR封包不能被更正機率的影響,並討論當改變一個Codeword可以被更正的符號數目時的封包不能被更正的機率。
    摘要(英) In a wireless sensor network (WSN), packet errors could occur due to weak signal strength or signal interference. These erroneous packets may have to be recovered through retransmission. However, too many retransmissions can increase network load significantly. Hence, in this Thesis, we propose a packet interleaving algorithm (PIA) based on Reed-Solomon (RS) code to reduce the retransmissions in a WSN. First, the collected data are classified into two different types; high-reliability request (HRR) data and low-reliability request (LRR) data. In RS code, collected data are converted into symbols according to the symbol length. To improve the transmission reliability, in PIA, an HRR packet is encoded with a short symbol and an LRR packet with a long symbol. Once an HRR and an LRR packet are transmitted, respectively, to a upper layer sensor in a tree-structured WSN, they are interleaved on a symbol-by-symbol basis. Thus, the effect of burst errors (BE) is dispersed into small portions so that the uncorrectable probability of HRR packets can be reduced. Finally, two models, the Uniform Bit-Error Model (UBEM) and the On-off Bit-Error Model (OBEM) are built to analyze the packet uncorrectable probability. In the two models, we first change the lengths of BE, and then we vary the shift positions in a BE period, and finally we change the number of correctable symbols to observe the impact of the three factors on the uncorrectable probability of HRR and LRR packets.
    關鍵字(中)
  • 封包不能被更正的機率
  • 交錯排列
  • WSN
  • 叢集錯誤
  • RS Code
  • 關鍵字(英)
  • Interleaving
  • Packet Uncorrectable Probability
  • RS Code
  • WSN
  • Burst Errors
  • 論文目次 致謝 i
    摘要 ii
    Abstract iii
    目錄 iv
    圖表目錄 vi
    第一章 導論 1
    1.1 研究動機 1
    1.2 研究方法 2
    1.3 論文架構 4
    第二章 WSN傳輸錯誤率 5
    2.1 WSN的傳輸與協定 5
    2.2 FEC 6
    2.2.1 RS Code的符號運算 8
    2.2.2 RS編碼 8
    2.2.3 RS解碼 9
    2.3 相關研究 13
    2.4 本論文的機制 15
    第三章 封包交錯編碼演算法 17
    3.1 系統架構 17
    3.2 封包交錯編碼 19
    3.2.1 符號長度m=8 21
    3.2.2 符號長度m=4 22
    3.2.3 LRR v.s. HRR 23
    3.2.4 Interleave的設計 25
    第四章 數學分析與結果 30
    4.1 UBEM的數學模型 30
    4.2 OBEM的數學模型 32
    4.2.1 符號錯誤機率的計算 33
    4.2.2 Codeword不能被更正的機率 41
    4.2.3 Packet不能被更正的機率 43
    4.3 數值分析與討論 45
    4.3.1 On小於Off 45
    4.3.2 On和Off的長度相等 48
    4.3.3 On長度大於Off 51
    4.3.4 位移的變化 53
    第五章 結論與未來工作 57
    5.1 結論 57
    5.2 未來工作 58
    Reference 59
    INDEX 63
    附錄:舉例說明 66
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    口試委員
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  • 黃宗傳 - 委員
  • 許蒼嶺 - 指導教授
  • 口試日期 2013-12-17 繳交日期 2013-12-23

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