高速行動環境下正交分頻多工系統中基於編碼決策指引反覆式子載波間干擾減抑之技術; Code-Decision Directed Iterative ICI Mitigation Techniques for OFDM System in High Mobility Environments

NCUIR > College of Electrical Engineering & Computer Science > Graduate Institute of Communication Engineering > Electronic Thesis & Dissertation > Item 987654321/48366

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/48366

Title:	高速行動環境下正交分頻多工系統中基於編碼決策指引反覆式子載波間干擾減抑之技術;Code-Decision Directed Iterative ICI Mitigation Techniques for OFDM System in High Mobility Environments
Authors:	吳崇瑋;Chong-Wei Wu
Contributors:	通訊工程研究所
Keywords:	正交分頻多工;最大近似校去法;載波間干擾;OFDM;AML;ICI
Date:	2011-08-19
Issue Date:	2012-01-05 14:52:43 (UTC+8)
Abstract:	Orthogonal frequency-division multiplexing (OFDM)是一個相當適合運用於寬頻通訊上的調變技術，但其缺點為高速移動之時變通道下的強烈普勒擴散。此時，子載波間的正交性被破壞並互相干擾(inter-carrier interference)使系統性能大大降低。此篇論文假設通道響應已知的情況下，比較各種不同之演算法在CD2(coded-decision directed)與D2(decision directed)系統下之性能差異，並提出一種基於AML(approximate maximum-likelihood)的共同搜索技巧，以提高系統效能。最後，以線性近似化簡消去法之高複雜度。 Orthogonal frequency-division multiplexing (OFDM) is a technique well suited for wireless broad-band communications.A drawback of OFDM is its sensitivity to time-varying channel effect in a mobile receiving environment with significant Doppler spread. In this scenario, the orthogonality between subcarriers is destroyed and the inter-carrier interference (ICI) is thus arised.In this thesis, we propose a modified iterative ICI mitigation method, which incorporates code-decision direct and an approximate maximum-likelihood detection, to improve the performance of a OFDM receiver in high-mobility environemt .
Appears in Collections:	[Graduate Institute of Communication Engineering] Electronic Thesis & Dissertation

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