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研究生:王亨榮
研究生(外文):Hung-Long Wang
論文名稱:利用渦輪碼在衛星上傳送非同步傳輸模式多媒體網路位元錯誤率模擬
論文名稱(外文):The Simulation of the Bit Error Rate for ATM Multimedia Network Over Satellite by Using Turbo Code
指導教授:白英文白英文引用關係
指導教授(外文):Ying-Wen Bai
學位類別:碩士
校院名稱:輔仁大學
系所名稱:電子工程學系
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:2005
畢業學年度:93
語文別:中文
中文關鍵詞:非同步傳輸模式
外文關鍵詞:ATMSatelliteDTVMPEG-2Turbo Code
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非同步傳輸模式(ATM)是一種能夠兼容語音、訊號、數據、多媒體圖片、影音訊號的傳輸及交換技術,並且可以保證不同業務和應用的服務品質(QOS);而衛星通信系統則以其特有的覆蓋能力廣、任意點對多點和多點對多點廣域網路拓樸優勢,可提供寬頻連接、長距離通信和可靠的安全等特性,成爲地面各種傳輸方式不可或缺的支援。衛星與ATM網路結合能綜合這兩種技術的優勢,以較少的投資就能爲更廣闊的區域提供服務,但因爲ATM的最初設計是基於光纖通道的,因此沒有過多的保護用於誤差控制,在結合數位電視之MPEG-2傳輸流訊號後,錯誤保護機制變得更為重要。因此,在採用誤差改正編碼技術時既要考慮衛星通信系統的功率受限性,及ATM細胞的特性,需採用高效率、誤差改正能力強的誤差控制技術,且電視訊號的應用所選的誤差改正碼更有延遲小、誤差改正能力強,並且簡單的可實現性要求。文中針對ATM傳送MPEG-2訊號時調適層的選擇加以討論,並使用渦輪碼作為衛星ATM網路傳送DVB數位廣播訊號之誤差改正碼,並因為渦輪碼軟式決策解碼方式較硬式決策或軟硬決策的鏈結碼,不會把解碼時有用的資訊丟棄,而有更好的表現。從模擬結果看出加入渦輪碼後的傳輸數據流位元錯誤率有效的降低,並且在低訊雜比下即有10-5的位元錯誤率表現,說明渦輪碼用於衛星ATM網路傳輸的可行性及優越性。
ATM(Asynchronous Transfer Mode)is a transmission switch technology, which can comprise audio, signal, data, multi-media photographs and video, and guarantee a good quality of service(QoS)for the different services and applications. A satellite communication system has the specific advantage of wide coverage, wide area network topology for random point to multi-points and multi-points to multi-points to provide the bandwidth connection, long distance communication and reliable safety. Therefore it became the indispensable support to the ground transmission. It can provide the service for wider area coverage with less investment by integrating the advantages both of the satellite network and of the ATM network. However, the initial ATM design is based on fiber channels, so there is no more protection on error control. Therefore the error correct system becomes more important after the integration of the MPEG-2 digital television transmission stream. Besides, we have to take account of the capacity of the satellite communication system and the character of the ATM cell to adopt error correction technology with high efficiency and good error correction ability. Moreover, the error correction code that the television signal applications choose has a short time delay and good error correction ability and is simple and accomplishable. The paper discusses the choice of adapted layer when ATM transfers the MPEG-2 signal and uses turbo code as the error correction code to transfer a DVB digital broadcast signal via Satellite-ATM network. We acquire better performance because turbo code soft-decision decoding is better than concatenate hard-decision or concatenate code soft-hard decision, which does not discard the useful information as decoding. From the simulation, we acquire the result that the transmission data stream bit error rate declined efficiently after using turbo code and under the performance of the 10-5 bits error rate under a low signal to noise ratio. Thus, it is better and feasible for Satellite-ATM network transmission by using turbo code.
中文摘要……………………………………………………………i
英文摘要……………………………………………………………ii
致謝…………………………………………………………………iii
目錄…………………………………………………………………iv
表目錄………………………………………………………………vi
圖目錄………………………………………………………………vii
符號說明……………………………………………………………ix
一、 緒論……………………………………………………………1
1.1 研究背景…………………………………………………1
1.2 研究動機…………………………………………………3
1.3 國內外相關文獻與研究…………………………………4
1.4 論文架構與各章節提要…………………………………5
二、 基本衛星原理及其調變技術的要求…………………………6
2.1 簡介………………………………………………………6
2.2 衛星系統和頻率的選擇…………………………………6
2.3 衛星通信系統使用的調變技術考慮……………………7
2.4 小結………………………………………………………11
三、 在ATM網中的DVB MPEG-2傳輸流傳輸分析…………………12
3.1 簡介……………………………………………………………12
3.2 非同步傳輸模式ATM(Asynchronous Transfer Mode)..........13
3.3 DVB系統(C/S/T)與ATM網的融合…………………………16
3.4 調適層(AAL)的選擇…………………………………………17
四、 使用渦輪碼用於ATM在衛星上誤差控制的方法....……………22
4.1 ATM中的傳輸保護………………….…………………………22
4.2 叢發錯誤(Burst Error)對ATM細胞的影響………………...…24
4.3 服務品質(QoS)參數與位元錯誤率(BER)的關係影響…...….27
4.4 使用渦輪碼及相關碼比較…………………………………...…30
五、 模擬實驗結果……………………………………………………36
5.1 模擬系統說明…………………………………………………36
5.2 細胞漏失對MPEG-2影音影響………………………………37
5.3 使用渦輪碼作向前錯誤改正碼模擬…………………………43
六、 總結與展望………………………………………………………51
6.1 總結……………………………………………………………51
6.2 展望……………………………………………………………52

參考文獻…………………………………………………………………54
附錄………………………………………………………………………57
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