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研究生:吳健豪
研究生(外文):Chien-Hao Wu
論文名稱:可提升具有前向糾錯的無線影像傳輸服務品質之封包大小控制方法
論文名稱(外文):A Packet Size Control Scheme for Improving the QoS of Wireless Video Transmission with Forward Error Correction
指導教授:謝錫堃謝錫堃引用關係黃文祥黃文祥引用關係
指導教授(外文):Ce-Kuen ShiehWen-Shyang Hwang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:電腦與通信工程研究所
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:56
中文關鍵詞:前向糾錯封包大小
外文關鍵詞:FECpacket size
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  • 下載下載:17
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在無線頻道上,影像傳輸的服務品質會因為封包的遺失而導致降低。根據先前的研究顯示,在具有連串錯誤特性的無線頻道上,封包的大小對封包遺失來說,有很大的影響。較小的封包擁有較低的封包遺失率,但卻有較高的額外負擔;相反地,較大的封包有較高的封包遺失率,但卻有較低的額外負擔。再者前向糾錯是一種廣為流傳的錯誤控制方法。 前向糾錯方法乃是使用一些冗餘封包來還原遺失掉的封包,但這些冗餘封包也會產生額外負擔。針對提升影像傳輸服務品質,本篇文章提出了一種具有可適性前向糾錯的封包大小控制方法。此提出的機制乃是使用切割的方法來控制封包大小,並藉此提高前向糾錯保護的效率。而實驗結果顯示出,相較於傳統的可適性前向糾錯方法,此提出的方法針對影像傳輸來説,將達到較高的服務品質,但卻只產生很低的頻寬消耗。
The quality of video transmission might be degraded by packet losses over the wireless channel. According to previous studies, it is shown that the packet size has a great impact on packet losses in the wireless channel with burst error property. The smaller packet size has the lower packet loss rate with the higher overhead, whereas the larger packet size has the higher packet loss rate with the lower overhead. Furthermore, Forward Error Correction (FEC) is a popular error control scheme. FEC employs the redundant packets to recover the lost packets, but the redundant packets induce the overhead. In this thesis, a packet size control scheme with adaptive FEC is proposed for improving the quality of video transmission. The proposed scheme utilizes the segmentation method to control the packet size and therefore the efficiency of FEC protection is improved. The experimental results show that compared to the traditional adaptive FEC scheme, the proposed scheme can achieve better quality of service for video transmission and much lower bandwidth consumption.
CONTENTS I
TABLES III
ILLUSTRATIONS IV
CHAPTER 1: INTRODUCTION 1
1.1 MOTIVATION 1
1.2 GOALS 4
1.3 ORGANIZATION 5
CHAPTER 2 BACKGROUND 7
2.1 EFFECT OF PACKET SIZE OVER BURST-ERROR CHANNELS 7
2.2 ERROR CONTROL 10
2.2.1 Forward Error Correction 11
2.2.2 Automatic Repeat Request 12
2.3 INTRODUCTION OF MPEG VIDEO STREAM 13
2.3.1 MPEG-1 17
2.3.2 MPEG-2 17
2.3.3 MPEG-4 18
CHAPTER 3 SEGMENTATION METHODS 19
3.1 THE DEPENDENT SEGMENTATION OF SOURCE DATA 20
3.2 THE INDEPENDENT SEGMENTATION OF SOURCE DATA 21
3.3 THE DEPENDENT SEGMENTATION OF REDUNDANT DATA 23
3.4 THE INDEPENDENT SEGMENTATION OF REDUNDANT DATA 25
CHAPTER 4 PACKET SIZE CONTROL SCHEME WITH ADPATIVE FEC 27
4.1 SYSTEM OVERVIEW 27
4.2 ALGORITHM ANALYSIS OF PROPOSE SCHEME 32
4.2.1 Packet Loss Rate Estimation 33
4.2.2 Loss Rate Prediction for Different Size Packets 35
4.2.3 FEC Protection Function 36
4.2.4 Control Strategy 38
4.2.5 Operations of the Control Algorithm 40
CHAPTER 5 EXPERIMENTS AND ANALYSIS 42
5.1 EXPERIMENT ENVIRONMENT 42
5.1.1 Experiment Platform 42
5.1.2 Wireless Error Model 43
5.1.3 Parameters of Packet Size Control Scheme with Adaptive FEC 44
5.2 PERFORMANCE EVALUATION PARAMETERS 45
5.3 EXPERIMENTAL RESULTS 46
CHAPTER 6 CONCLUSIONS AND FUTURE WORK 51
REFERENCES 52
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