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研究生:劉如傑
研究生(外文):Ju-Chieh Liu
論文名稱:適用於高速移動環境下的無線區域網路通道追蹤技術
論文名稱(外文):Channel Tracking Techniques for the High-Mobility Wireless Access in Vehicular Environments
指導教授:劉宗憲劉宗憲引用關係
學位類別:碩士
校院名稱:國立中正大學
系所名稱:通訊工程研究所
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:95
語文別:中文
論文頁數:63
中文關鍵詞:位元錯誤率Decision-Directed正交分頻多工系統通道追蹤封包錯誤率Fading channel
外文關鍵詞:Fading channelPERuncoded BERChannel trackingOFDM system
相關次數:
  • 被引用被引用:1
  • 點閱點閱:419
  • 評分評分:
  • 下載下載:45
  • 收藏至我的研究室書目清單書目收藏:1
Wireless Access Vehicular Environment (WAVE)標準,或稱做IEEE 802.11p,應用在高速移動的環境下,為使用Orthogonal Frequency Division Multiplexing (OFDM)作為核心調變技術的例子。在高速移動的環境下,接收到的信號除了受到多重路徑的干擾效應之外,也受到了嚴重的衰減效應影響。在高速移動的環境下,如何追蹤通道的狀態就變得非常關鍵。根據傳統的Decision-Directed通道追蹤 (DDCT)演算法,我們提出了一個改良的Decision-Directed通道追蹤 (MDDCT)演算法。我們所提出的演算法可以得到和傳統DDCT演算法非常接近的uncoded bit error rate (BER),但是在釵h高速狀況的模擬環境下卻有明顯較傳統DDCT演算法有較低的packet error rate (PER)性能表現。經由比較DDCT和MDDCT在經由解調後之未編碼位元的錯誤型態可以發現我們所提出的演算法可以減緩burst error的產生,始得接下來的錯誤更正解碼器可以更有效率的更正錯誤,降低PER。最後,我們所提出的演算法有非常低的複雜度以及適合硬體實現。
The industrial standard of Wireless Access Vehicular Environment (WAVE), or called the IEEE 802.11p standard, is an example of the orthogonal frequency division multiplexing (OFDM) technique applied to the high-mobility environment. In addition to the multipath effect, the high-mobility environment introduces severe fading to the received signals. Tracking of the channel state information becomes the critical issue for such high-mobility system. Based one the conventional decision-directed channel tracking (DDCT) algorithm, we proposes a modified decision-directed channel tracking (MDDCT) algorithm. Our proposed algorithm is shown to have approximately equal uncoded bit error rate (BER) to that of the conventional DDCT algorithm, but have significant lower packet error rate than that of the conventional DDCT algorithm under a variety of high-mobility environments. After comparing the error patterns of the uncoded bits that are demodulated by the conventional and our MDDCT algorithms, we observe that our MDDCT algorithm mitigates the burst error; hence, the following error correction decoder works more effectively to improve its packet error rate. Finally, our MDDCT is of very low complexity, and is of practical use.
1. 序論...................................................................1
2. 正交分頻多工系統(Orthogonal Frequency Division Multiplexing System,
OFDM System)...........................................................5
3. 無線區域網路 (WLAN) 之IEEE 802.11a與IEEE 802.11p Wireless Access
in Vehicular Environments (WAVE) 實體層規範...........................14
4. 通道模型 (Channel Model)..............................................27
5. Modified decision-directed Channel Tracking (MDDCT)...................32
6. 電腦模擬與效能分析....................................................36
7. 結論與未來工作........................................................45
%%第1篇%%
ibitem1 IEEE 802.11p,

ewblock{em Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) draft specifications: High-speed Physical Layer in the 5 GHz Band.}

ewblock{IEEE Draft p802.11p, 2005.}
%%第2篇%%
ibitem{r2} IEEE 802.11a,

ewblock{em Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: High-speed Physical Layer in the 5 GHz Band.}

ewblock{IEEE Std 802.11a, 1999.}
%%第3篇%%
ibitem{r3} J. Terry and J. Heiskala,

ewblock{em OFDM Wireless LANs: A Theoretical and Practical Guide.}

ewblock{SAMS Publishing, 2001.}
%%第4篇%%
ibitem{r4} S. Coleri, M. Ergen, A. Puri, and A. Bahai,

ewblock{" Channel Estimation Techniques Based on Pilot Arrangement in OFDM Systems,"}

ewblock{em in Proc. IEEE on Broadcast,}

ewblock{2002, Vol. 48, pp. 223- 229.}
%%第5篇%%
ibitem{r5} P. Y. Tsai, and T. D. Chiueh,

ewblock{" Frequency-domain interpolation-based channel estimation in pilot-aided OFDM systems,"}

ewblock{em in Proc. IEEE Vehic. Tech. Conf. (VTC),}

ewblock{2004, pp. 420 - 424.}
%%第6篇%%
ibitem{r6} R. Gr"unheid, H. Rohling, J. Ran, E. Bolinth, and R. Kern,

ewblock{``Robust Channel Estimation in Wireless LANs for Mobile Environments,'}

ewblock{em in Proc. IEEE Vehic. Tech. Conf. (VTC),}

ewblock{Sept. 2002, pp. 1545-1549.}
%%第7篇%%
ibitem{r7} J. Zhu, and W. Lee,

ewblock{" Channel estimation with power-controlled pilot symbols and decision-directed reference symbols,"}

ewblock{em in Proc. IEEE Vehic. Tech. Conf. (VTC),}

ewblock{2003, pp.1268 - 1272.}
%%第8篇%%
ibitem{r8} S. Balasubramanian, B. B. Farhang, and V. J. Mathews,

ewblock{"Pilot embedding for channel estimation and tracking in OFDM systems,"}

ewblock{em in Proc. IEEE Global Telecommunications Conf,}

ewblock{2004, pp. 1244 - 1248.}
%%第9篇%%
ibitem{r9} H.-K. Song, Y.-h. You, J.-H. Paik, and Y.-S. Cho,

ewblock{``Frequency-Offset Synchronization and Channel Estimation for OFDM-Based Transmission,'}

ewblock{em IEEE Commun. Lett,}

ewblock{vol. 4, pp. 95-97, Mar. 2000.}
%%第10篇%%
ibitem{r10} R. J. Lyman, and W. W. Edmonson,

ewblock{``Decision-Directed Tracking of Fading Channels Using Linear Prediction of the Fading Envelope,'}

ewblock{em in Proc. IEEE Asilomar Conf. on Signal Processing Systems and Computers,}

ewblock{vol. 2, 1999, pp. 1154-1158.}
%%第11篇%%
ibitem{r11} J. Ran, R. Gr"{u}nheid, H. Rohling, E. Bolinth and R. Kern,

ewblock{``Decision-directed Channel Estimation Method for OFDM Systems with High Velocities,'}

ewblock{em in Proc. IEEE Vehic. Tech. Conf. (VTC),}

ewblock{2003, pp. 2358-2361.}
%%第12篇%%
ibitem{r12} T. Kella,

ewblock{``Decision-directed Channel Estimation for Supporting Higher Terminal Velocities in OFDM Based WLANs,'}

ewblock{em in Proc. IEEE Global Telecommunications Conf,}

ewblock{2003, pp. 1306-1310.}
%%第13篇%%
ibitem{r13} M. Rim,

ewblock{``Optimally combining decision-directed and pilot-symbol-aided channel estimators,'}

ewblock{em in Electronics Letters,}

ewblock{2003, pp. 558- 560.}
%%第14篇%%
ibitem{r14} 馮信堯,

ewblock{於正交分頻多工系統中使用超取樣技術之相位追蹤演算法與其效能分析.}

ewblock{中華民國94年7月.}
%%第15篇%%
ibitem{r15} 張耀仁,

ewblock{高速移動多媒體通訊系統的效能分析.}

ewblock{中華民國94年7月.}
%%第77篇%%
ibitem{r77} C. Xiao, Y. R. Zheng, and N. C. Beaulieu,

ewblock{" Statistical simulation models for Rayleigh and Rician fading,"}

ewblock{em in Proc. IEEE ICC' 03,}

ewblock{2003, pp. 3524-3529.}
%%第78篇%%
ibitem{r78} B. O'Hara and A. Petrick,

ewblock{em IEEE 802.11 Handbook - A Designer's Companion.}

ewblock{IEEE Press, 1999.}
%%第16篇%%
ibitem{r16} T. S. Rappaport,

ewblock{em Wireless Communications : Principles and Practice.}

ewblock{Prentice Hall, 2002.}
%%第17篇%%
ibitem{r79} A. Niemi, J. Joutsensalo, and T. Ristaniemi,

ewblock{" Fuzzy channel estimation in multipath fading CDMA channel,"}

ewblock{em in Proc. IEEE PIMRC' 00,}

ewblock{vol. 2, pp. 1131-1135, Sept. 2000.}
%%第18篇%%
ibitem{r18} M. Simon and M. Alouini,

ewblock{em Digital Communication over Fading Channels - A Unified Approach to Performance Analysis.}

ewblock{Wiley, 2000.}
%%第23篇%%
ibitem{r23} S. Sibecas, C. A. Corral, S. Emami, and G. Stratis,

ewblock{"On the suitability of 802.11a/RA for high-mobility DSRC,"}

ewblock{em in Proc. IEEE Vehic. Tech. Conf. (VTC),}

ewblock{2002, pp. 229-234.}
%%第24篇%%
ibitem{r24} S. Sibecas, C. A. Corral, S. Emami, G. Stratis, and G. Rasor,

ewblock{"Pseudo-pilot OFDM scheme for 802.11a and R/A in DSRC applications,"}

ewblock{em in Proc. IEEE Vehic. Tech. Conf. (VTC),}

ewblock{2003, pp. 1234-1237.}
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