NDLI: Effect and Compensation of Symbol Timing Offset in OFDM Systems With Channel Interpolation

Content Provider	IEEE Xplore Digital Library
Author	Dah-Chung Chang
Copyright Year	1963
Abstract	Symbol timing offset (STO) can result in intersymbol interference (ISI) and a rotated phase which value is proportional to the subcarrier index at the FFT output in an OFDM receiver. In order to avoid ISI, the FFT window start position has to be put in advance of the estimated point obtained by coarse STO estimation algorithms. But a large number of forward-shift samples will deteriorate the estimation of data subcarrier channels requiring interpolation from pilot subcarrier channels due to the phase rotation caused by a residual STO. In this paper we analyze the influence of STO on channel interpolation and propose a new compensation method for channel correction with STO. From the performance analysis of simulation results in the DVB-T application, the new algorithm not only has a better performance but also is attractive in using a simple residual STO estimation method such that few pilots are required for fine STO estimation compared to conventional approaches.
Sponsorship	IEEE Broadcast Technology Society
Starting Page	761
Ending Page	770
Page Count	10
File Size	1473244
File Format	PDF
ISSN	00189316
Volume Number	54
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Timing OFDM Interpolation Intersymbol interference Digital video broadcasting Maximum likelihood estimation Delay estimation Phase estimation Digital audio broadcasting Frequency synchronization symbol timing offset Channel interpolation DVB-T intersymbol interference
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Media Technology

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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