NDLI: ICI mitigation for mobile OFDM receivers

Content Provider	IEEE Xplore Digital Library
Author	Mostofi, Y. Cox, D.C. Bahai, A.
Copyright Year	2003
Description	Author affiliation: Stanford Univ., CA, USA (Mostofi, Y.; Cox, D.C.)
Abstract	Orthogonal frequency division multiplexing (OFDM) is robust against inter-symbol interference (ISI) due to the increase of the symbol duration. However, for mobile applications, channel variations during one OFDM symbol introduce inter-carrier-interference (ICI), which degrades the performance. This gets more severe as mobile speed, carrier frequency or OFDM symbol duration increases. We introduce two new methods to mitigate ICI in an OFDM system with coherent channel estimation. Both methods use a piece-wise linear model to approximate channel variations. The first method extracts channel variations information from the cyclic prefix. The second method estimates these variations utilizing the next symbol. Since mathematical analysis of the whole system becomes intractable in a long delay spread environment, we provide a mathematical analysis that investigates the effect of linearization for the case of a time-variant one path channel. Then our simulation results show how these methods would improve the performance in a highly time-variant environment with a long delay spread.
Starting Page	3351
Ending Page	3355
File Size	322888
Page Count	5
File Format	PDF
ISBN	0780378024
DOI	10.1109/ICC.2003.1204076
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-05-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Mathematical analysis Robustness Intersymbol interference Degradation Channel estimation Piecewise linear techniques Linear approximation Data mining Delay effects
Content Type	Text
Resource Type	Article

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