NDLI: Blind symbol-timing and frequency-offset estimation in OFDM systems with real data symbols

Content Provider	IEEE Xplore Digital Library
Author	Tanda, M.
Copyright Year	1972
Abstract	In this letter, the problem of blind symbol-timing and frequency-offset estimation in orthogonal frequency-division multiplexing (OFDM) systems with real data symbols is considered. Maximum-likelihood (ML) estimators for the parameters of interest have been derived by modeling the OFDM signal as a proper complex Gaussian random process. However, when data symbols belong to a real constellation, the received signal becomes an improper complex random process, and hence, previously mentioned estimators, termed cyclic prefix (CP) estimators, are not ML estimators. In this letter, minimum mean-squared error estimators exploiting the conjugate-symmetry property exhibited by the OFDM signal with real data symbols, termed MSR estimators, that greatly outperform CP estimators in additive noise channels, are derived. Moreover, a modified MSR symbol-timing estimator that can assure satisfactory performance in multipath fading channels is proposed.
Starting Page	1609
Ending Page	1612
Page Count	4
File Size	178511
File Format	PDF
ISSN	00906778
Volume Number	52
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency estimation OFDM Maximum likelihood estimation Signal processing Random processes Frequency division multiplexing Parameter estimation Constellation diagram Additive noise Fading orthogonal frequency-division multiplexing (OFDM) systems Frequency offset and timing recovery
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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