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Title: | 都卜勒效應所產生之正交分頻通訊系統相鄰載波間干擾(ICI)抑制方法研究 Methods for Mitigating Inter-carrier Interference in OFDM Communication Systems Induced by Doppler Effect |
Authors: | Liang-Cheng Huang 黃亮誠 |
Advisor: | 鄭士康(Shyh-Kang Jeng) |
Keyword: | 正交分頻多工,都卜勒效應,相鄰載波干擾, OFDM,Doppler estimation,ICI self-cancellation, |
Publication Year : | 2006 |
Degree: | 碩士 |
Abstract: | 在本篇論文中,我們將要討論都卜勒效應對正交分頻多工系統(orthogonal frequency division multiplexing)的影響。在許多行動通訊的應用上,都卜勒效應會造成通道時變性,使正交分頻多工系統產生載波間互相干擾(inter-carrier interference, ICI)。並且,隨著載波頻率,物體速度和符號長度增加,都卜勒效應所產生的載波間互相干擾會更嚴重。所以,我們必須去設法減緩載波間互相的干擾。
這本篇論文中,我們使用自我消除載波互相干擾(ICI self-cancellation)這個方法去解決都卜勒所產生的載波互相干擾,並且討論其特性。我們也提出一種方法來增進自我消除載波互相干擾的效能。最後,我們再對可適性的自我消除載波互相干擾加以探討。 In this thesis, we are going to discuss the Doppler effect in OFDM (orthogonal frequency division multiplexing) systems. In many mobile applications, Doppler effect makes the channel time-varying and causes inter-carrier interference (ICI) in OFDM systems. The ICI induced by Doppler will be severe as the carrier frequency, object velocity or symbol duration increases. Therefore, there is a need for ICI mitigation in OFDM systems. In this thesis, we use ICI self-cancellation scheme to improve the OFDM systems under mobile condition, and discuss its characteristics under mobile condition. We also propose a method to improve ICI self-cancellation and have a good performance. Finally, we are going to discuss an adaptive scheme using ICI self-cancellation. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/33613 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 電信工程學研究所 |
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