跳到主要內容

臺灣博碩士論文加值系統

(44.221.73.157) 您好!臺灣時間:2024/06/20 19:21
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

: 
twitterline
研究生:周先倫
研究生(外文):Hsien-Lum Chou
論文名稱:歐規數位電視系統於移動式接收之錯誤率效能分析與改善
論文名稱(外文):The Error Probability Performance Evaluation and Improvement of Mobile Reception for DVB-T System
指導教授:林信標林信標引用關係
口試委員:曾銘健余金郎丘建青林丁丙
口試日期:2006-06-23
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:電腦與通訊研究所
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:中文
論文頁數:54
中文關鍵詞:歐規數位電視載波間干擾框化保護區間
外文關鍵詞:Digital Video Broadcasting- Terrestrial(DVB-T)Inter-Carrier Interference (ICI)windowingguard interval
相關次數:
  • 被引用被引用:0
  • 點閱點閱:137
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
數位電視系統已在國內開始普遍,最初標準的制定方向是用於室內的固定式接收,但如今多數消費者將其使用在室外的移動接式接收,移動接收會造成都普勒效應而導致訊號受到載波間干擾,因此如何減少載波間干擾成為重要的課題。此篇論文使用框化方法來分析歐規數位電視系統於移動接收的效能。
首先依據歐規數位電視標準建立Matlab/Simulink模擬平台,並搭配框化的方法以及理想的通道估測,探討在不同的移動速度以及參數設定下,框化方法對數位電視系統效能提升的程度。從模擬結果發現,當接收訊號只有直視波成份且車速為70Km/h時,分別使用一倍、1/2倍及1/4倍的保護區間於BER= 條件下,BER效能比沒有使用框化方法的效能分別提升了9dB、7dB及5dB;當車速達到200Km/h且BER= 時,BER效能改善了13dB、10dB及7dB。此外若增加通道的最大延遲時間,則會因可用的保護區間減少而使效能改善幅度降低。
論文中更探討框化方法在常用的通道估測方法下的效能。觀察結果得知,線性內插通道估測雖然方法簡單、容易實行,但在錯誤率效能表現上不盡理想,在EbNo=40dB時錯誤率高達 ;引入框化方法後,其效能雖有改善但於BER= 時改善了7dB。而快速傅利葉轉換通道估測雖較線性內插通道估測複雜,但其錯誤率效能和理想通道估測的效能相差約1dB至2dB。
Doppler effect caused by mobile reception will destroy the orthogonality between subcarriers of OFDM system and result in ICI. Therefore how to reduce the ICI in DVB-T system is an important research topic. This paper utilized windowing method to provide the performance evaluation of DVB-T system in outdoor mobile channels.
In this paper, we build simulation platform based on DVB-T standard and utilize windowing method under different conditions of guard intervals and configuration parameters to improve the BER performance. The result of simulation shows that when guard intervals are 1, 1/2, and 1/4, the performance under the condition of BER= are about 9dB, 7dB, and 5dB, respectively.
This paper also observes the performance improvement with windowing method by introducing non-perfect channel estimation. The result of simulation shows that channel estimation with FFT interpolation can lead to the better BER performance than with linear interpolation. And the difference in BER performance between channel estimation with FFT interpolation and perfect channel estimation is about 2dB.
摘要 i
ABSTRACT ii
誌謝 iii
目錄 iv
表目錄 v
圖目錄 vi
第一章 緒論 1
1.1 動機與目的 1
1.2 章節介紹 2
第二章 都普勒效應對歐規數位電視系統效能的影響 3
2.1 簡介 3
2.2 歐規數位電視系統標準 4
2.3 建立歐規數位電視系統標準 20
2.4 模擬結果 21
2.5 總結 22
第三章 脈波塑形方法用於歐規數位電視系統 23
3.1 傳統正交分頻多工系統 23
3.2 框化概念 24
3.3 系統架構 28
3.4 模擬結果 29
3.4.1框化於不同保護區間比之效能 29
3.4.2框化於不同移動速度之效能 34
3.4.3框化於不同最大延遲時間之效能 36
3.5 總結 38
第四章 脈波塑形技術用於非理想通道估測之歐規數位電視系統 40
4.1 通道估測方法 40
4.2 根據k值調整之適應性脈波塑形機制 43
4.3 模擬設定與結果 46
4.4 總結 48
第五章 結論 50
參考文獻 52
[1]ETSI EN 300 744, “Digital Video Broadcasting(DVB); Framing structure, channel coding and modulation for digital terrestrial television,” v1.5.1, November 2004.
[2]http://www.dvo.org.tw/
[3]COST 207: Digital Land Mobile Radio Communications, Commission of the European Communities, 1989.
[4]W. G.. Jeon, K. H. Chang and Y. S. Cho, “An equalization technique for orthogonal frequency-division multiplexing systems in time-variant multipath channels,” IEEE Trans. Commun., vol. 47, no. 1, pp. 27 - 32, January 1999.
[5]C. Muschallik, “Improving an OFDM reception using an adaptive Nyquist windowing,” IEEE Transactions on Consumer Electronics, vol. 42, no. 3, pp. 259 - 269, August 1996.
[6]N. Beaulieu and P. Tan, “Receiver Windowing for Reduction of ICI in OFDM Systems with Carrier Frequency Offset,” IEEE Globecom, vol. 5, no. 28, pp. 2680 – 2684, November 2005.
[7]R. Song and S. Leung, “A Novel OFDM Receiver with Second Order Polynomial Nyquist Window Function,” IEEE Communication Letters, vol. 9, no. 5, pp. 391 – 393 , May 2005.
[8]Y. Zhao and S. Häggman, “Intercarrier interference self-cancellation scheme for OFDM mobile communication systems,” IEEE Trans. Commun., vol. 49, no. 7, pp. 1185 - 1191, July 2001.
[9]A. Seyedi and G. Saulnier, “General ICI Self-Cancellation Scheme for OFDM Systems,” IEEE Transaction on Vehicular Technology, vol. 54, no. 1, pp. 198- 210, January 2005.
[10]J. Cai, J. Mark, and X. Shen, “ICI cancellation in OFDM wireless communication systems,” IEEE Globecom, vol. 1, no.1, pp. 656 - 660, November 2002.
[11]J.G. Prokis, Digital Communication, McGRAW-HILL, 2000.
[12]Simon Haykin, Communication systems, New York, Wiley, 2000.
[13]M. H. Hsieh and C. H. Wei, “Channel estimation for OFDM systems based on comb-type pilot arrangement in frequency selective fading channels,” IEEE Trans. Consumer Electron., vol. 44, no. 1, pp. 217 - 225, February 1998.
[14]S. Coleri, M. Ergen, A. Puri, and A. Bahai, “Channel estimation techniques based on pilot arrangement in OFDM systems,” IEEE Transactions on Broadcasting, vol. 48, no. 3, pp. 223 - 229, September 2002.
[15]Y. Zhao, A. Huang, “A novel channel estimation method for OFDM mobile communication systems based on pilot signals and transform-domain processing,” in Proc. IEEE 47th Vehicular Technology Conf., vol. 3 no. 4, pp. 2089 – 2093, May 1997.
[16]T. S. Rappaport, Wireless Communications: Principles & Practice, Prentice Hall, 1996.
[17]Simon R. Saunders, Antennas and Propagation for Wireless Communication Systems, John Wiley, 1999.
[18]鄭名宏,多輸入多輸出正交分頻多工系統於室內頻率選擇性衰落通道之錯誤率效能分析,碩士論文,國立台北科技大學電腦通訊與控制研究所,台北,2003。
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top