Iterative joint frequency offset and channel estimation for OFDM systems using first and second order approximation algorithms
學年 101
學期 1
出版（發表）日期 2012-11-01
作品名稱 Iterative joint frequency offset and channel estimation for OFDM systems using first and second order approximation algorithms
作品名稱（其他語言）
著者 Yen, Rainfield Y; Liu, Hong-Yu; Tsai, Chia-Sheng
單位 淡江大學電機工程學系
出版者 Heidelberg: SpringerOpen
著錄名稱、卷期、頁數 EURASIP Journal on Wireless Communications and Networking 2012(1), 341(10pages)
摘要 To implement an algorithm for joint estimation of carrier frequency offset (CFO) and channel impulse response (CIR) in orthogonal frequency division multiplexing (OFDM) systems, the maximum-likelihood criterion is commonly adopted. A major difficulty arises from the highly nonlinear nature of the log-likelihood function which renders local extrema or multiple solutions for the CFO and CIR estimators. Use of an approximation method coupled with an adaptive iteration algorithm has been a popular approach to ease problem solving. The approximation used in those existing methods is usually of the first order level. Here, in addition to a new first order approximation method, we also propose a second order approximation method. Further, for the part of the adaptive iteration algorithm, we adopt a new technique which will enable performance improvement. Our first order approximation method is found to outperform the existing ones in terms of estimation accuracies, tracking range, computation complexity, and convergence speed. As expected, our second order approximation method provides an even further improvement at the expense of higher computation complication.
關鍵字
語言 en_US
ISSN 1687-1499 1687-1472
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 否
國別 DEU
公開徵稿
出版型式 ,電子版,紙本
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