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Article: A Consistent OFDM Carrier Frequency Offset Estimator Based on Distinctively Spaced Pilot Tones
Title | A Consistent OFDM Carrier Frequency Offset Estimator Based on Distinctively Spaced Pilot Tones |
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Authors | |
Keywords | Frequency synchronization Maximum likelihood estimate Orthogonal frequency-division multiplexing (OFDM) Periodogram Pilot tone |
Issue Date | 2004 |
Publisher | IEEE. |
Citation | Ieee Transactions On Wireless Communications, 2004, v. 3 n. 2, p. 588-599 How to Cite? |
Abstract | A 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 Identifier | http://hdl.handle.net/10722/42969 |
ISSN | 2023 Impact Factor: 8.9 2023 SCImago Journal Rankings: 5.371 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lei, J | en_HK |
dc.contributor.author | Ng, TS | en_HK |
dc.date.accessioned | 2007-03-23T04:35:42Z | - |
dc.date.available | 2007-03-23T04:35:42Z | - |
dc.date.issued | 2004 | en_HK |
dc.identifier.citation | Ieee Transactions On Wireless Communications, 2004, v. 3 n. 2, p. 588-599 | en_HK |
dc.identifier.issn | 1536-1276 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/42969 | - |
dc.description.abstract | A 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.extent | 401588 bytes | - |
dc.format.extent | 8772 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.format.mimetype | text/plain | - |
dc.language | eng | en_HK |
dc.publisher | IEEE. | en_HK |
dc.relation.ispartof | IEEE Transactions on Wireless Communications | en_HK |
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. | - |
dc.subject | Frequency synchronization | en_HK |
dc.subject | Maximum likelihood estimate | en_HK |
dc.subject | Orthogonal frequency-division multiplexing (OFDM) | en_HK |
dc.subject | Periodogram | en_HK |
dc.subject | Pilot tone | en_HK |
dc.title | A Consistent OFDM Carrier Frequency Offset Estimator Based on Distinctively Spaced Pilot Tones | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://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+tones | en_HK |
dc.identifier.email | Ng, TS:tsng@eee.hku.hk | en_HK |
dc.identifier.authority | Ng, TS=rp00159 | en_HK |
dc.description.nature | published_or_final_version | en_HK |
dc.identifier.doi | 10.1109/TWC.2004.825350 | en_HK |
dc.identifier.scopus | eid_2-s2.0-2342480476 | en_HK |
dc.identifier.hkuros | 90248 | - |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-2342480476&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 3 | en_HK |
dc.identifier.issue | 2 | en_HK |
dc.identifier.spage | 588 | en_HK |
dc.identifier.epage | 599 | en_HK |
dc.identifier.isi | WOS:000220158400027 | - |
dc.publisher.place | United States | en_HK |
dc.identifier.scopusauthorid | Lei, J=55254291400 | en_HK |
dc.identifier.scopusauthorid | Ng, TS=7402229975 | en_HK |
dc.identifier.citeulike | 10156233 | - |
dc.identifier.issnl | 1536-1276 | - |