Improved maximum likelihood frequency offset estimation based on likelihood metric design

For emerging high data-rate communication systems in highly dispersive channels such as ultrawideband (UWB) systems, possible frequency offsets could be larger than the estimation range of the existing methods using training signals with identical parts or repetitive training signals (i.e., the trai...

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Bibliographic Details
Published in:IEEE transactions on signal processing 2006-06, Vol.54 (6), p.2076-2086
Main Authors: Hlaing Minn, Tarasak, P.
Format: Article
Language:English
Subjects:
Applied sciences
Channels
Communication systems
Design engineering
Detection, estimation, filtering, equalization, prediction
Dispersion
Estimation
Estimators
Exact sciences and technology
Fading
Frequency estimation
frequency offset
Frequency synchronization
Handles
Information, signal and communications theory
likelihood metric design
Maximum likelihood estimation
Offsets
Pairwise error probability
Signal and communications theory
Signal design
Signal, noise
Studies
synchronization
Telecommunications and information theory
Training
Ultra wideband technology
Ultrawideband
Wireless LAN
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Summary:For emerging high data-rate communication systems in highly dispersive channels such as ultrawideband (UWB) systems, possible frequency offsets could be larger than the estimation range of the existing methods using training signals with identical parts or repetitive training signals (i.e., the training signals are composed of several identical subblocks or are obtained by repeating a training subblock for several times). This paper presents a novel improved maximum likelihood frequency offset estimator which can handle at least twice the estimation range of the existing methods using training signals with identical parts and achieves a better estimation performance. Based on the likelihood metric, a new design metric is introduced which is a pair-wise error probability (PEP) between the correct frequency offset point and a trial frequency offset point. The proposed PEP metric gives more theoretical insights on the performance of practical maximum likelihood estimators. How to design the PEP to achieve both a larger estimation range and a better estimation performance in fading channel environments is also presented and the corresponding estimator implementation is described.
ISSN:1053-587X
1941-0476
DOI:10.1109/TSP.2006.874301