An Investigation into the Properties of ML-NVE with Channel Estimation Error and Carrier Frequency Offset in OFDM Systems

碩士 === 國立中山大學 === 通訊工程研究所 === 97 === Noise variance estimator is very important in communication system which could control the transmission power and help system to reach the maximum capacity. But almost every kind of noise variance estimators assume that channel status is perfectly. Unfortunately...

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Bibliographic Details
Main Authors:	Hou-Lin Chen, 陳侯霖
Other Authors:	Chih-Peng Li
Format:	Others
Language:	zh-TW
Published:	2009
Online Access:	http://ndltd.ncl.edu.tw/handle/v54849

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spelling	ndltd-TW-097NSYS56500202019-05-29T03:42:53Z http://ndltd.ncl.edu.tw/handle/v54849 An Investigation into the Properties of ML-NVE with Channel Estimation Error and Carrier Frequency Offset in OFDM Systems 存在頻率誤差與通道估測誤差的正交分頻多工系統中最大慨似雜訊估測器的特性討論 Hou-Lin Chen 陳侯霖碩士國立中山大學通訊工程研究所 97 Noise variance estimator is very important in communication system which could control the transmission power and help system to reach the maximum capacity. But almost every kind of noise variance estimators assume that channel status is perfectly. Unfortunately the estimation error is always existence. This paper discuss that the maximum likelihood noise variance estimator (ML-NVE) in orthogonal frequency division multiplexing (OFDM) system with estimated channel. We take two kinds of the most popular channel estimation (CE) schemes Least Square (LS) and Modified-Least Square (MLS) as our consideration. And we investigate the situation that the ML-NVE suffered by carrier frequency offset (CFO) due to imperfect synchronization. As result we will show off the mean and variance of ML-NVE in those situations. Chih-Peng Li 李志鵬 2009 學位論文 ; thesis 59 zh-TW
collection	NDLTD
language	zh-TW
format	Others
sources	NDLTD
description	碩士 === 國立中山大學 === 通訊工程研究所 === 97 === Noise variance estimator is very important in communication system which could control the transmission power and help system to reach the maximum capacity. But almost every kind of noise variance estimators assume that channel status is perfectly. Unfortunately the estimation error is always existence. This paper discuss that the maximum likelihood noise variance estimator (ML-NVE) in orthogonal frequency division multiplexing (OFDM) system with estimated channel. We take two kinds of the most popular channel estimation (CE) schemes Least Square (LS) and Modified-Least Square (MLS) as our consideration. And we investigate the situation that the ML-NVE suffered by carrier frequency offset (CFO) due to imperfect synchronization. As result we will show off the mean and variance of ML-NVE in those situations.
author2	Chih-Peng Li
author_facet	Chih-Peng Li Hou-Lin Chen 陳侯霖
author	Hou-Lin Chen 陳侯霖
spellingShingle	Hou-Lin Chen 陳侯霖 An Investigation into the Properties of ML-NVE with Channel Estimation Error and Carrier Frequency Offset in OFDM Systems
author_sort	Hou-Lin Chen
title	An Investigation into the Properties of ML-NVE with Channel Estimation Error and Carrier Frequency Offset in OFDM Systems
title_short	An Investigation into the Properties of ML-NVE with Channel Estimation Error and Carrier Frequency Offset in OFDM Systems
title_full	An Investigation into the Properties of ML-NVE with Channel Estimation Error and Carrier Frequency Offset in OFDM Systems
title_fullStr	An Investigation into the Properties of ML-NVE with Channel Estimation Error and Carrier Frequency Offset in OFDM Systems
title_full_unstemmed	An Investigation into the Properties of ML-NVE with Channel Estimation Error and Carrier Frequency Offset in OFDM Systems
title_sort	investigation into the properties of ml-nve with channel estimation error and carrier frequency offset in ofdm systems
publishDate	2009
url	http://ndltd.ncl.edu.tw/handle/v54849
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An Investigation into the Properties of ML-NVE with Channel Estimation Error and Carrier Frequency Offset in OFDM Systems

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