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研究生:林雍揚
研究生(外文):Yung-Yang Lin
論文名稱:歐規數位無線電視錯誤修正系統之模擬及效能分析
論文名稱(外文):SIMULATION AND PERFORMANCE ANALYSIS OF DVB-T ERROR-CORRECTING SYSTEM
指導教授:許超雲許超雲引用關係
指導教授(外文):Chau-Yun Hsu
學位類別:碩士
校院名稱:大同大學
系所名稱:電機工程學系(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:93
中文關鍵詞:正交分頻多工數位電視
外文關鍵詞:OFDMDVB-T
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我國數位電視採用DVB-T(Digital Video Broadcasting-Terrestrial) 歐洲規格的發射系統,在指配給電視台的一個6MHz 頻道中,原本只能播出一個類比電視節目,但電視訊號經「數位壓縮」處理後,一個頻道可以同時播出三個或更多的標準畫質電視SDTV(Standard TV)節目。
由於位元率壓縮技術不斷的進步,雖然可以大大的節省傳輸頻寬,提高頻道的利用率,但是也付出了一個相當大的代價,就是對於傳輸的干擾變的十分的敏感。一般而論,壓縮倍數越高,數位電視對傳輸干擾的抵抗能力越弱,因此在傳輸過程中需加上頻道編碼,雖然會降低傳輸負載容量,但可求得較佳之傳輸特性。
而為了解決此問題,DVB-T使用COFDM之編碼,近一步的提高傳輸系統的可靠性,錯誤修正編碼也就是為了這個目的所提出來的。但是任何的錯誤修正系統的修正能力都是有限的,在傳輸信號中造成的位元錯誤超過錯誤修正能力時,錯誤修正系統將無法修正錯誤,並可能會造成更嚴重的錯誤產生。
因此DVB-T採用了兩級的錯誤修正方法來近一步提高錯誤修正的能力。而本篇論文將在Simulink的模擬環境中建立一個DVB-T的系統,並針對其錯誤修正系統的效能來做分析與比較。
The digital TV in Taiwan adopts the transmission system of the DVB-T (Digital Video Broadcasting-Terrestrial). Originally, we can only broadcast a simulation TV program in 6MHz channel, but now, with the TV signal had been “digital compressed”, we can broadcast three or more Standard TV in one channel at the same time.
Because of the bit compressed technology progresses constantly, the TV and broadcast are all overall digitization. Although the bit compressed technology can save the transmission bandwidth and improve the utilization ratio of the channel, it paid a huge cost in become very sensitive in interference of transmission. Generally speaking, the higher the compression ratio is, the weaker the resistance of transmission interference it had in digital TV. Therefore, we need to add the channel code to get better transmission characteristic, although it may reduce the loading capacity of transmission.
To solve this problem, DVB-T uses the code of COFDM. It can improve the dependability of the transmission system, and the error correcting system put forward the purpose. However, the revision ability is limited in any error correcting system. In signal transmitting, when the digital error is bigger than the error-correcting ability, it will be unable to revise the error, may cause more serious error.
Therefore, DVB-T adopts two grades of error-correcting methods to improve the error-correcting ability. In this paper, it will set up the DVB-T system in the simulation environment of Simulink, and we can analysis and compare the efficiency of error correcting system.
ACKNOWLEDGMENT I
摘要 II
ABSTRACT III
CONTENTS IV
LIST OF FIGURE VII
LIST OF TABLE X
CHAPTER 1 INTRODUCTION 1
1.1 Introduction 1
1.2 Organization of the Thesis 2
CHAPTER 2 PRINCIPLE OF COFDM SYSTEM 3
2.1 Basic Concepts of OFDM 3
2.1.1 Bandwidth Efficiency 3
2.1.2 System Diagram 5
2.1.3 Applications 6
2.2 Subcarriers Generation 7
2.2.1 Using IFFT to Generate Subcarriers 7
2.3 Guard Interval and Cyclic Prefix 9
2.4 Error–correcting system 11
2.4.1 Reed-Solomon code 11
2.4.2 Interleaving 14
2.4.3 Convolutional code 20
CHAPTER 3 STANDARD AND TECHNOLOGY OF DVB-T SYSTEM 24
3.1 Functional block diagram of the System 24
3.2. Channel coding and modulation 28
3.2.1 Transport multiplex adaptation and randomization for energy Dispersal 28
3.2.2 Outer coding and outer interleaving 30
3.2.3 Inner coding 32
3.2.4 Inner interleaving 34
3.2.5 Signal constellations and mapping 41
3.3 OFDM frame structure 47
3.4 Reference signals 50
3.4.1 Functions and derivation 50
3.4.2 Definition of reference sequence 50
3.4.3 Location of scattered pilot cells 51
3.4.4 Location of continual pilot carriers 52
3.4.5 Amplitudes of all reference information 53
3.5 Transmission Parameter Signalling (TPS) 53
3.5.1 Scope of the TPS 54
3.5.2 TPS transmission format 56
3.5.3 TPS modulation 61
3.6 Systematic parameter of DVBT 61
CHAPTER 4 SIMULATION AND RESULT 63
4.1 Introduction to simulink 63
4.2 DVB-T demos to simulink 63
4.3 DVB-T demos simulation result 68
4.3.1 Performance analysis with error-correcting system 69
4.3.2 Performance analysis with different channel 73
CHAPTER 5 CONCLUSIONS 78
REFERENCES 79
[1] ETSI EN 300 744 V1.4.1, "Digital Video Broadcasting (DVB) ; Framing structure, channel coding and modulation for digital terrestrial television", 2001.01.
[2] Gert Nielsen, "COFDM Technology", ProTeleVision Technologies, Denmark, 2001.
[3] Chip Fleming, "Tutorial on Convolutional Coding with Viterbi Decoding", Derwood Maryland USA, 2002.01.31.
[4] L. J. Cimini. Jr, "Analysis and simulation of a digital mobile channel using orthogonal frequency division multiplexing," IEEE Trans. Commun., vol. COM-33, no. 7, pp.655-675, July 1985.
[5] ETSI, "Radio Broadcasting Systems: Digital Audio Broadcasting to Mobile, Portable and Fixed Receivers," European Telecommunication Standard, ETS 300-401, Feb. 1995.
[6] Tuttlebee, W. H. W., and D. A. Hawkins, "Consumer Digital Radio: From Concept to Reality," Electronics and Communication Engineering Journal, Vol. 10, No. 6, pp. 263-276, Dec. 1998.
[7] ETSI, "Digital Video Broadcasting: Framing Structure, Channel Coding, and Modulation for Digital Terrestrial Television," European Telecommunication Standard, EN 300-744, Aug. 1997.
[8] Reimers, U., "DVB-T: The COFDM-Based System for Terrestrial Television, "Electronics and Communication Engineering Journal, Vol. 9, No. 1, pp. 28-32, Feb. 1997.
[9] Gallager, R. G., Information Theory and Reliable Communication, John Wiley and Sons, New York, 1968.
[10] Ramsey, J. L., "Realization of Optimum Interleavers," IEEE Trans. Inform. Theory, vol. IT-16, no. 3, May 1970, pp 338-345.
[11] Forney, G. D., "Burst-Correcting Codes for the Classic Bursty Channel," IEEE Trans. Commun. Technol., vol. COM-19, Oct. 1971, pp. 772-781.
[12] Clark, G. C., Jr., and Cain, J. B., Error-Correction Coding for Digital Communications, Plenum Press, New York, 1981.
[13] Odenwalder, J. P., Optimal Decoding of Convolutional Codes, Ph.D. dissertation, University of California, Los Angeles, 1970.
[14] Curry, S. J., Selection of Convolutional Codes Having Large Free Distance, Ph.D. dissertation, University of California, Los Angeles, 1971.
[15] Larsen, K.J., "Short Convolutional Codes with Maximal Free Distance for Rates , ,and ," IEEE Trans. Inf. Theory, vol. IT19, no.3, 1997, pp. 371-372
[16] ISO/IEC 13818: "Information technology - Generic coding of moving pictures and associated audio information - Parts 1 (Systems), 2 (Video) and 3 (Audio)".
[17] ETSI EN 300 421: "Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for 11/12 GHz satellite services".
[18] ETSI EN 300 429: "Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for cable systems".
[19] ETSI EN 300 468: "Digital Video Broadcasting (DVB); Specification for Service Information (SI) in DVB systems".
[20] ETSI Standard EN 300 744: Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for digital terrestrial television, European Telecommunications Standards Institute, Valbonne, France, 1997.
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