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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 曹建和(Jenho Tsao) | |
dc.contributor.author | Jing-Luen Liao | en |
dc.contributor.author | 廖經倫 | zh_TW |
dc.date.accessioned | 2021-06-15T03:52:43Z | - |
dc.date.available | 2011-08-22 | |
dc.date.copyright | 2011-08-22 | |
dc.date.issued | 2011 | |
dc.date.submitted | 2011-08-17 | |
dc.identifier.citation | [1] James Preisig, “Acoustic Propagation Considerations for Underwater
Acoustic Communications Network Development” ACM SIGMOBILE Mobile Computing and Communications Review, Volume 11 Issue 4, October 2007 [2] Abolfazl Falahati, Bryan Woodward, and Stephen C. Bateman, “Underwater Acoustic Channel Models For 4800 b/s QPSK Signals” IEEE J. Oceanic Eng., vol. 16, no. 1, Jan. 1991. [3] S.Fechtal and H.Meyr, “An investigation of channel estimation and equalization techniques for moderately rapid fading HF channels” in PTOC. ICC’91, pp. 25.2.1-25.2.5, Denver, CO, June 1991. [4] PShukla and L.Turner, “Channel-estimation-based adaptive DFE for fading multipath radio channels” IEE Proc. I, vol. 138, No. 6, pp.525-543, Dec. 1991. [5] James Preisig, “Coherent Acoustic Communications through the Imperfect Ocean: Adaptive Least Squares, Time Reversal, and Connections to Adaptive Array Processing” IEEE Underwater Acoustic Signal Proc. Workshop. W. Greenwich, RI, Oct., 2003. [6] James Preisig, “The impact of Underwater Acoustic Channel Structure and Dynamics on the Performance of Adaptive Coherent Equalizers” High Frequency Ocean Acoustics Conference 2004. La Jolla, CA, March, 2004. [7] James Preisig, “Adaptive Channel Equalization in the Time-Varying Underwater Acoustic Channel: Performance Characterization and Robust Equalizers” , 12th Annual Workshop on Adaptive Sensor Array Processing, Lexington, MA, March 16-18, 2004. [8] M.Stojanovic, J.Catipovic, and J.G.Proakis, “Adaptive multichannel combining and equalization for underwater acoustic communications” The Journal of the Acoustical Society of America, vol. 94, pp. 1621-1631, 1993. [9] M.Stojamovic, J.A.Catipovic and J.G.Proakis, “Reduced-complexity multichannel processing of underwater acoustic communication signals” Journal of the Acoustical Society of America, vo1.98 (2), Pt. 1, pp.961-972, Aug, 1995. [10] Milica Stojanovic, John G. Proakis, Josko A. Catipovic, “Analysis of the Impact of Channel Estimation Errors on the Performance of a Decision-Feedback Equalizer in Fading Multipath Channels” IEEE Trans. Communications, vol. 43, no. 2/3/4, Feb./March/April, 1995. [11] M.Stojanovic, L.Freitag, M Johnson, “Channel-Estimation-Based Adaptive Equalization of Underwater Acoustic Signals” OCEANS'99 MTS/IEEE. Riding the Crest into the 21st Century, vol.2, pp.590 - 595. [12] S. Haykin, “Adaptive Filter Theory” Third ed. Englewood Cliffs, NJ:Prentice-Hall, 1996. [13] A. Zielinski, Y. Yoon, and L. Wu, “Performance analysis of digital acoustic communication in a shallow water channel” IEEE J. Oceanic Eng., vol. 20, pp. 293–299, Oct. 1995. [14] J. Preisig,, “Performance analysis of adaptive equalization for coherent acoustic communications in the time-varying ocean environment”, J. Acoust. Soc. Am., vol. 118(1), pp. 263-278, 2005. [15] S. R. Ramp, J. F. Lynch, P. H. Dahl, C.S. Chiu, and J. A. Simmen “ASIAEX fosters advances in shallow-water acosutics” EOS, Trans. AGU, vol. 84, no. 37, pp. 361– 367, 2003. [16] Yung-Sheng Chiu, Yuan-Ying Chang, Li-Wen Hsieh, Mei-Chun Yuan, and Chi-Fang Chen “Three-dimensional acoustics effects in the ASIAEX SCS experiment,” J. Comp. Acoust., Vol. 17, No. 1, pp.11-27, March 2009. [17] Chi-Fang Chen, Tswen-Yung Tang, Ruey-Chang Wei, Gee-Pinn Too, and Ying-Jang Yang, et al, “The Asian Seas International Acoustics Experiment (ASIAEX) Analysis Workshop,” Proceedings of the ASIAEX Analysis Workshop, UAL-NTU TR 0303, Taipei, Taiwan, 2003(UAL-NTU TR 0303) [18] Y.S. Linus Chiu, Chi-Fang Chen, “Time reversal processing effect on foci structure in a dynamic ocean waveguide,” Journal of Mechanics, Vol. 23, No. 3, pp.221-233, September 2007. [19] Yung-Sheng Chiu, Yuan-Ying Chang, Li-Wen Hsieh, Mei-Chun Yuan, and Chi-Fang Chen, “Three-dimensional acoustics effects in the ASIAEX SCS experiment,” J. Comp. Acoust., Vol. 17, No. 1, pp.11-27, March 2009. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/44676 | - |
dc.description.abstract | 海洋是一隨著不同時間及空間持續在改變的傳導環境,而其水下聲音傳播的頻率只在較低頻率時才有較好的效果,且其可供通訊用的有效頻寬往往被極度的限制。而水下聲通訊和陸地上的無線電通訊主要有兩個差異:其一是水聲通道有相當長的多重路徑延遲,其範圍可包含十到一百多個符號。另一是其通道會隨著時間快速的變化。
由於水聲通道的傳播特性,其信號處理往往會變得高度的複雜,為了減少其計算複雜度,因此基於其物理通道的特性去設計接收器是必要的。 基於通道估測的可適性等化器-是依據事先估測其通道的參數並利用此估測來消除掉此通道後軌帶來的符元間干擾,最後再通過線性等化器。這篇論文探討了通道估測的錯誤對於等化器的效能影響。 | zh_TW |
dc.description.abstract | Underwater acoustic channels are generally recognized as one of the most difficult communication media in use today. The ocean is a time and spatially varying propagation environment. The underwater acoustic propagation is best supported at low frequencies, and the bandwidth available for communication is extremely limited. The underwater acoustic communication differ from RF communication in two aspects: One is the long multipath delay time that containing ten to hundreds of symbols, and the other is the rapid time variation of underwater acoustic channel.
The receiver structure that has been found useful in many applications is a decision-feedback equalizer(DFE). Due to the nature of the propagation channel, the required signal processing is often prohibitively complex, to reduce computational complexity of signal processing, the receiver structures that are matched to the physical channel characteristics are investigates. A channel estimation-based equalization which relies on an adaptive channel estimation to compute its parameters, this estimation is used to cancel the post-cursor ISI before the linear equalization. The impact of estimation error on the channel estimation-based equalizer are investigated. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T03:52:43Z (GMT). No. of bitstreams: 1 ntu-100-R98942121-1.pdf: 1499997 bytes, checksum: 08dbe3cd5e2a7645b5e7baf46915a6f1 (MD5) Previous issue date: 2011 | en |
dc.description.tableofcontents | 誌謝…………………………………………………………………i
中文摘要……………………………………………………………ii 英文摘要……………………………………………………………iii Chapter 1 Introduction…………………………………1 1.1 A brief background of Underwater Acoustic Channel ………………………………………………………………………1 1.2 An introduction of channel equalization…………3 1.2.1 Why use Channel-estimation-based equalization…3 1.2.2 About Channel Estimation……………………………4 1.3 Research motivation……………………………………6 Chapter 2 Adaptive equalization of UWA channel…7 2.1 Channel and System model……………………………7 2.2 Channel estimation-based Decision Feedback Equalizer……………………………………………………………11 2.3 Implementation of CE-DFE……………………………17 2.4 Linear equalization by Least Mean Square (LMS) algorithm……………………………………………………………20 2.5 Comparison of Linear equalization and CE-DFE…26 Chapter 3 Performance analysis of CE-DFE…………29 3.1 The impact of time variety (channel fluctuation) on CE-DFE………………………………………………………………29 3.1.1 Signal-To-Multipath Ratio (SMR) and SNR…………29 3.2 The impact of channel estimation error on CE-DFE………………………………………………………………32 3.2.1 Minimum Achievable Error and Excess Error………34 3.2.2 Equalizer performance prediction…………………35 Chapter 4 Simulation Result……………………………42 4.1 The Asia Seas International Acoustic Experiment (ASIAEX)……………………………………………………………42 4.2 Performance results……………………………………43 4.2.1 Performance analysis of the impact of the Channel fluctuation…………………………………………………………43 4.2.2 Performance analysis of the impact of the estimation error…………………………………………………47 Chapter 5 Conclusion……………………………………54 Reference……………………………………………………………55 | |
dc.language.iso | en | |
dc.title | 水聲通訊之估測錯誤對於以通道估測為基礎之可適性等化器的影響 | zh_TW |
dc.title | The Impact of Estimation Error on Channel Estimation-Based Equalizer for UWA Channel | en |
dc.type | Thesis | |
dc.date.schoolyear | 99-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 陳琪芳(Chi-Fang Chen),邱永盛(Yung-Sheng Chiu) | |
dc.subject.keyword | 等化器,水下聲通訊,通道估測, | zh_TW |
dc.subject.keyword | equlizer,underwater acoustic communication,channel estimation, | en |
dc.relation.page | 56 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2011-08-18 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
顯示於系所單位: | 電信工程學研究所 |
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