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研究生:林育志
研究生(外文):Yu-chih Lin
論文名稱:無線正交分頻多工通訊系統中運用啁啾信號之時間與頻率偏移估測
論文名稱(外文):Joint Time and Frequency Offset Estimation Assisted from Chirp Signal forWireless OFDM Communications
指導教授:林嘉慶林嘉慶引用關係
指導教授(外文):Jia-chin Lin
學位類別:碩士
校院名稱:國立中央大學
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:2008
畢業學年度:96
語文別:中文
論文頁數:61
中文關鍵詞:啁啾信號時間與頻率偏移估測同步
外文關鍵詞:synchronizationchirp signalestimation
相關次數:
  • 被引用被引用:2
  • 點閱點閱:179
  • 評分評分:
  • 下載下載:34
  • 收藏至我的研究室書目清單書目收藏:0
本論文提出一種適用於無線通訊系統的時間與頻率偏移估測技術,利用雙啁啾信號可有效地估測時間與頻率誤差。此方法可應用於各種通訊環境之同步。我們提出時域與頻域兩種接收器,並比較兩者的效能與準確度。其中一接收器使用兩個時域相關器,藉著估測時間峰值進行線性組合運算以估測時間與頻率。另一則使用一組成對的頻域相關器,藉著估測頻率峰值進行線性轉換以估測時間與頻率。最後以正交分頻多工系統之參數進行模擬,結果證明其可有效地達成同步。
This paper describes two novel structures for reception of dual-chirp
waveforms. The approaches provide mechanisms for synchronization in
various communications environments. Both detection performance, and time
and frequency estimation accuracy are analyzed and simulated. One receiver
utilizes a dual time-domain correlator to initially estimate two peak times after
detection. Time and frequency estimates are obtained by linearly combining the
peak time estimates. The second receiver uses paired frequency-domain
correlators to initially estimate two peak frequencies and then linearly convert
them to the time and frequency estimates.
第一章緒論1
1.1 導論1
1.2 研究動機3
第二章正交分頻多工系統及無線傳輸通道4
2.1 正交分頻多工系統概述4
2.2 正交分頻多工系統之同步問題7
2.3 無線傳播通道10
2.3.1 衰落效應(Fading Effect) 10
2.3.2 都卜勒頻率偏移(Doppler Shift) 11
2.3.3 延遲展延(Delay Spread) 12
2.3.4 平坦衰落(Flat Fading) 13
2.3.5 頻率選擇性衰落(Frequency Selective Fading) 13
2.4 都卜勒擴散引起的衰落效應14
2.4.1 快速衰落(Fast Fading) 14
2.4.2 緩慢衰落(Slow Fading) 15
2.4.3 瑞雷衰落(Rayleigh Fading) 16
第三章以啁啾信號實現OFDM 信號同步18
3.1 啁啾信號之簡介19
II
3.1.1 啁啾信號(Chirp Signal) 19
3.1.2 雙啁啾信號(Dual Chirp Signal) 20
3.2 啁啾信號之同步接收器21
3.2.1 時域相關接收器21
3.2.2 頻域相關接收器27
3.2.3 時域相關接收器與頻域相關接收器之複雜度30
3.2.4 估測效能32
3.3 實際雙啁啾信號估測效能34
3.3.1 二階估測34
3.3.2 模擬結果35
3.3.3 PRP-OFDM 通道估測43
第四章結論與未來展望46
參考文獻47
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Aretch House Univ. Personal Commun. Lib., 2000.
[2] S. Boumard and A. Mammela, “Time Domain Synchronization Using Newman
Chirp Training Sequences in AWGN Channels,” Proc. Int. Conf.
Commun.( ICC2005)., vol. 2, pp. 1147-1151, 2005.
[3] J.-C. Lin, “Least-Squares Channel Estimation for Mobile OFDM
Communication on Time-Varying Frequency-Selective Fading Channels,” Proc.
Int. Conf. Commun.( ICC2007) pp.3016-3023, June 2007.
[4] L. H`azy and M. El-Tanany, “Synchronization of OFDM systems over
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pp. 2094–2098, May 1997.
[5] D.C. Rife and R.R. Boorstyn, “Single-Tone Parameter Estimation From
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pp. 591–598,Sept. 1974
[6] D. R. Wehner, High-Resolution Radar, Artech House, Second edition, 1994
[7] R. Prasad, CDMA for Wireless Personal Communications, Artech House
Publishers, 1996.
[8] Z.L. Shi, Y. Antia, R. Hammons, “A Sub-Burst DFT Scheme for CW Burst
Detection in Mobile Satellite Communication,” IEEE Journ. Sel. Area.
Commun, vol. 18, no. 3, pp. 380–390, March 2000.
[9] T. Onizawa , M. Mizoguchi , and M .Morikura M, “A Fast Synchronization
Scheme of OFDM Signals for High-Rate Wireless LAN,” IEICE Trans.
Commun., vol. E82-B, no.2, pp. 455–463,February 1999
48
[10] M.D. Srinath, P.K. Rajasekaran and R. Viswanathan, Introduction to Statistical
Signal Processing with Applications, Prentice Hall Information and System
Sciences Series, 1996.
[11] Boumard, S.; Mainmela, A, “Synchronization Using Chirp Training Sequences
in Multipath Channels,” IEEE Global Telecommunications Conference,
GLOBECOM ''07, pp.4030 – 4034, Nov. 2007.
[12] Z.L. Shi, M. Parr, T.G. Vishwanath, and S. Erlich, Synchronization in mobile
satellite systems using dual-chirp waveform, United States Patent 6418158,
2002.
[13] V. Trees, Detection, Estimation, and Modulation Theory. Part 1, Detection,
Estimation, and Linear Modulation Theory, JohnWiley and Sons, Inc., 1968.
[14] M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions, Dover
Publications, Inc., New York, 1965.
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