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Article: A Consistent OFDM Carrier Frequency Offset Estimator Based on Distinctively Spaced Pilot Tones

TitleA Consistent OFDM Carrier Frequency Offset Estimator Based on Distinctively Spaced Pilot Tones
Authors
KeywordsFrequency synchronization
Maximum likelihood estimate
Orthogonal frequency-division multiplexing (OFDM)
Periodogram
Pilot tone
Issue Date2004
PublisherIEEE.
Citation
Ieee Transactions On Wireless Communications, 2004, v. 3 n. 2, p. 588-599 How to Cite?
AbstractA pilot-tone-based maximum likelihood estimator (PBMLE) for carrier frequency offset (CFO) in orthogonal frequency-division multiplexing (OFDM) systems is proposed. To obtain a consistent estimate of the CFO over a frequency-selective fading channel, the proposed method employs a preamble comprising distinctively spaced pilot tones. As a result of this preamble configuration, a large estimation range equal to the bandwidth of the OFDM signal can be achieved. Different from previous ad hoc pilot-tone-based CFO estimators, the PBMLE exploits the relationship between the CFO and the periodogram of the preamble. Analysis shows that the proposed PBMLE is asymptotically unbiased and efficient. To realize this PBMLE in practice, a suboptimal estimator is also introduced, in which a zero-padded fast Fourier transform is invoked and the CFO estimation is split into two phases: coarse and fine estimation. Coarse estimation is obtained through the correlation between the received preamble and its original pattern, whereas fine estimation is obtained by exploiting the magnitude attenuation in the vicinities of those CFO-shifted pilot tones. Both analytical investigations and computer simulations indicate that the accuracy of this simplified suboptimal estimator is proportional to the oversize ratio of zero padding. When the oversize ratio is sufficiently high, the performance of the suboptimal estimator approaches that of the proposed PBMLE.
Persistent Identifierhttp://hdl.handle.net/10722/42969
ISSN
2015 Impact Factor: 2.925
2015 SCImago Journal Rankings: 2.340
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLei, Jen_HK
dc.contributor.authorNg, TSen_HK
dc.date.accessioned2007-03-23T04:35:42Z-
dc.date.available2007-03-23T04:35:42Z-
dc.date.issued2004en_HK
dc.identifier.citationIeee Transactions On Wireless Communications, 2004, v. 3 n. 2, p. 588-599en_HK
dc.identifier.issn1536-1276en_HK
dc.identifier.urihttp://hdl.handle.net/10722/42969-
dc.description.abstractA pilot-tone-based maximum likelihood estimator (PBMLE) for carrier frequency offset (CFO) in orthogonal frequency-division multiplexing (OFDM) systems is proposed. To obtain a consistent estimate of the CFO over a frequency-selective fading channel, the proposed method employs a preamble comprising distinctively spaced pilot tones. As a result of this preamble configuration, a large estimation range equal to the bandwidth of the OFDM signal can be achieved. Different from previous ad hoc pilot-tone-based CFO estimators, the PBMLE exploits the relationship between the CFO and the periodogram of the preamble. Analysis shows that the proposed PBMLE is asymptotically unbiased and efficient. To realize this PBMLE in practice, a suboptimal estimator is also introduced, in which a zero-padded fast Fourier transform is invoked and the CFO estimation is split into two phases: coarse and fine estimation. Coarse estimation is obtained through the correlation between the received preamble and its original pattern, whereas fine estimation is obtained by exploiting the magnitude attenuation in the vicinities of those CFO-shifted pilot tones. Both analytical investigations and computer simulations indicate that the accuracy of this simplified suboptimal estimator is proportional to the oversize ratio of zero padding. When the oversize ratio is sufficiently high, the performance of the suboptimal estimator approaches that of the proposed PBMLE.en_HK
dc.format.extent401588 bytes-
dc.format.extent8772 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherIEEE.en_HK
dc.relation.ispartofIEEE Transactions on Wireless Communicationsen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rights©2004 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.en_HK
dc.subjectFrequency synchronizationen_HK
dc.subjectMaximum likelihood estimateen_HK
dc.subjectOrthogonal frequency-division multiplexing (OFDM)en_HK
dc.subjectPeriodogramen_HK
dc.subjectPilot toneen_HK
dc.titleA Consistent OFDM Carrier Frequency Offset Estimator Based on Distinctively Spaced Pilot Tonesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1536-1276&volume=3&issue=2&spage=588&epage=599&date=2004&atitle=A+consistent+OFDM+carrier+frequency+offset+estimator+based+on+distinctively+spaced+pilot+tonesen_HK
dc.identifier.emailNg, TS:tsng@eee.hku.hken_HK
dc.identifier.authorityNg, TS=rp00159en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1109/TWC.2004.825350en_HK
dc.identifier.scopuseid_2-s2.0-2342480476en_HK
dc.identifier.hkuros90248-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-2342480476&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume3en_HK
dc.identifier.issue2en_HK
dc.identifier.spage588en_HK
dc.identifier.epage599en_HK
dc.identifier.isiWOS:000220158400027-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLei, J=55254291400en_HK
dc.identifier.scopusauthoridNg, TS=7402229975en_HK
dc.identifier.citeulike10156233-

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