NDLI: Timing and Phase Offset Sensitivity of Autocorrelation Based Frequency Estimation in an FH-OFDM System

Content Provider	IEEE Xplore Digital Library
Author	Anttonen, A. Siltala, S. Mammela, A.
Copyright Year	2007
Description	Author affiliation: VTT Tech. Res. Centre of Finland, Oulu (Anttonen, A.; Siltala, S.; Mammela, A.)
Abstract	In this paper, a new aspect on the problem of carrier frequency offset (CFO) estimation is studied in a frequency-hopping (FH) orthogonal frequency division multiplexing (OFDM) system. Unlike in a traditional nonhopped OFDM system, in FH-OFDM system it is important to verify how accurately frequency-switching must be performed before the CFO estimation can take place with adequate performance. The accuracy of frequency-switching is evaluated through frequency-hopping timing offset (FHO) and frequency-hopping phase offset (PHO) between the received signal and the signal produced by the local frequency-hopping synthesizer of the receiver. The target system uses ultra-wideband (UWB) in order to achieve very high data rate of 1.6 Gbit/s. The performance of selected autocorrelation based algorithms is simulated in multipath fading channel under the FHO and PHO, and the results are compared to the performance of ideal frequency-switching and the corresponding analytical Cramer-Rao bound. It is found that the CFO estimators based on autocorrelation principle are quite robust to the FHO less than half the hopping period. Furthermore, simple methods are proposed to compensate the degradation caused by the FHO. The estimators are, however, sensitive to the PHO caused by the possible lack of phase memory in the frequency-hopping synthesizer resulting in a significant bias to the CFO estimate.
Starting Page	2379
Ending Page	2383
File Size	270628
Page Count	5
File Format	PDF
ISBN	1424402662
ISSN	15502252
DOI	10.1109/VETECS.2007.491
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-04-22
Publisher Place	Ireland
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Timing Autocorrelation Frequency estimation Frequency synthesizers OFDM Phase estimation Ultra wideband technology Analytical models Fading Performance analysis
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Electrical and Electronic Engineering Computer Science Applications

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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