NDLI: A Maximum Likelihood Fine Timing Estimation <newline/>for Wireless OFDM Systems

Content Provider	IEEE Xplore Digital Library
Author	Hao Zhou Yih-Fang Huang
Copyright Year	1963
Abstract	Orthogonal frequency division multiplexing (OFDM) systems are more sensitive to timing synchronization than single carrier systems. This paper presents a fine timing synchronization scheme which utilizes the channel impulse response (CIR) estimated from frequency-domain samples at OFDM receivers. A maximum likelihood estimate (MLE) of timing offset is derived based on the probability distribution of the estimated CIR under time-varying multipath fading. The ML timing scheme is further developed for both integer precision and real-valued precision implementations. In the real-valued timing precision case, a delay locked loop (DLL) structure is devised as an effective way to implement the MLE. Both analysis and simulations of the proposed MLE showed significant improvement over existing schemes under time-varying multipath fading channels.
Sponsorship	IEEE Broadcast Technology Society
Starting Page	31
Ending Page	41
Page Count	11
File Size	1026534
File Format	PDF
ISSN	00189316
Volume Number	55
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Maximum likelihood estimation Timing OFDM Frequency synchronization Fading Wireless sensor networks Frequency estimation Probability distribution Delay effects Analytical models timing synchronization Maximum likelihood estimate time-varying multipath fading channel
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Media Technology

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