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研究生:陳思穎
研究生(外文):Si-Ying Chen
論文名稱:應用錯誤控制和雍塞控制之可伸縮性視訊傳輸
論文名稱(外文):Error Control and Congestion Control for Streaming MPEG-4 FGS Video Over Internet
指導教授:黃仲陵黃仲陵引用關係
指導教授(外文):Chung-Lin Huang
學位類別:碩士
校院名稱:國立清華大學
系所名稱:電機工程學系
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:2002
畢業學年度:90
語文別:西班牙文
論文頁數:46
中文關鍵詞:錯誤控制
外文關鍵詞:Error Control
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隨著個人電腦及寬頻網路的普及,在網路上視訊流的傳輸已越來越蓬勃發展。然而,要提供一個可接受的穩定視訊品質,仍有很大的進步空間。網路多變的不穩定特性是視訊傳輸的最大阻礙。頻寬的變化,封包的流失及網路的壅塞都有可能是造成視訊不穩定的原因。因此,要提供一個可靠品質服務便成了一個刻不容緩的議題。針對頻寬的時變性,MPEG-4 在FGS中提出了可調式的編碼傳輸架構,它只需要同一個事先編碼好的視訊資料便可以在各種不同的頻寬底下作傳輸。他提供了一個十分有效率的頻寬利用。然而,在網路的傳輸過程中,仍不免會有錯誤產生或封包流失,因此針對此問題,我們便必須再加進錯誤控制及壅塞控制,來減少此情況的發生。錯誤控制,可以用來更正所收到的錯誤資料來增加傳輸的可靠性。而壅塞控制則可以避免大量的封包流失。
在我們的論文中,我們針對了視訊傳輸的各種問題提出了一個具有適應性能力的傳輸系統,我們結合了可調式編碼,錯誤控制及壅塞控制。利用壅塞控制來量測封包流失率及計算出適當的傳輸速率,然後根據這兩個資訊來作適當的錯誤保護機制保護具有彈性調整能力的編碼訊源,以達到最佳的品質傳輸。我們針對了三種不同的封包包裝方式,分別加上錯誤控制及壅塞控制,並比較其結果表現。從實驗的結果得知,在我們的傳輸架構下,此三種包裝方式均有不錯的效果表現,顯示我們的系統是適用於網路上的視訊傳輸。

In this thesis, we propose a video transmission scheme based on error control and congestion control for three MPEG-4 FGS packetization strategies, namely baseline packetization, binary tree packetization, and optimal packetization. An optimal distribution of source and parity packets is found to minimize the end-to-end distortion for the three different packetization schemes based on the packet loss probability and transmission rate bound estimation in previous time interval. The packet loss probability and throughput estimation is obtained by the congestion control scheme. Here, we use equation-based congestion control for the multimedia transmission due to its smoothing sending rate and well-defined avoidance of congestion collapse.

Abstract 1
Content 2
Chapter 1. Introduction 4
Chapter 2. Source Coding and Packetization 8
2.1 Introduction of MPEG-4 FGS Coding 8
2.2 Three Packetization Schemes 11
2.2.1 Baseline Packetization 11
2.2.2 Binary Tree Packetization 12
2.2.3 Optimal Packetization 14
Chapter 3. Error Control and Congestion Control 16
3.1 Channel Coding using FEC 16
3.2 Error Control for Three Packetization Schemes 17
3.2.1 Error Control for Baseline Packetization 18
3.2.1-1 Derivation of Rate and Distortion Function 18
3.2.1-2 Rate Allocation to Minimize the Expected Distortion 21
3.2.2 Error Control for Binary Tree Packetization 24
3.2.3 Error Control for Optimal Packetization 24
3.3 TCP-Friendly Rate Control 26
3.3.1 Equation Based Congestion Control Protocol Overview 27
Chapter 4. Simulation Model and Experimental Results 29
4.1 Channel Model 29
4.2 NS Simulation Model 30
4.3 Implementation and Results 31
Chapter 5. Conclusion and Future Work 44
Reference 45

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