Frequency offset estimation technique based on error characterization for OFDM communications on time-varying multipath fading channels

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2 Scopus citations

Abstract

A novel frequency offset estimation technique based on maximum-likelihood estimation (MLE) for wireless OFDM communications over a doubly-selective fading channel is proposed. By taking advantage of subcarrier-level differential operation and coherent error characterization, the proposed estimator can effectively overcome frequency-selective fading effects. Frequency error characterization is achieved by pseudo-noise (PN) matched filters (MF) in the frequency direction; thus, the proposed estimation technique exploits frequency diversity with the maximum ratio combining (MRC). In addition, the proposed technique can combat the rapid time-selectivity caused by a wide Doppler spread because it requires channel stationarity for only a short duration due to the exploitation of both a single preamble in its training operation and the following semi-blind estimation aided from several pilot subchannels. The proposed technique can not only easily switch between training mode and semi-blind mode, but also easily swap from a coarse frequency offset estimation operation to a fine frequency offset estimation operation by sharing the same preamble block and the same system architecture. Extensive simulation results in conjunction with statistical analysis verify the superiority of the proposed technique.

Original languageEnglish
Title of host publication2006 IEEE International Conference on Communications, ICC 2006
Pages2911-2916
Number of pages6
DOIs
StatePublished - 2006
Event2006 IEEE International Conference on Communications, ICC 2006 - Istanbul, Turkey
Duration: 11 Jul 200615 Jul 2006

Publication series

NameIEEE International Conference on Communications
Volume7
ISSN (Print)0536-1486

Conference

Conference2006 IEEE International Conference on Communications, ICC 2006
Country/TerritoryTurkey
CityIstanbul
Period11/07/0615/07/06

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