NDLI: Time and frequency synchronisation in optical wireless OFDM networks

Content Provider	IEEE Xplore Digital Library
Author	Ghimire, B. Stefan, I. Elgala, H. Haas, H.
Copyright Year	2011
Description	Author affiliation: School of Engineering and Science, Jacobs University Bremen, 28759, Germany (Ghimire, B.; Stefan, I.; Elgala, H.; Haas, H.)
Abstract	This paper analyses the impact of imperfect synchronisation in optical orthogonal frequency division multiplexing (OFDM) systems utilising intensity modulation (IM) / direct detection (DD). The use of IM/DD technique inherently eliminates the problem of carrier frequency offset. Therefore, time-frequency synchronisation in optical OFDM system reduces to frame synchronisation and sampling clock synchronisation. Sampling clock offset causes irreducible intercarrier interference (ICI) and symbol timing offset. A technique to mitigate the impact of sampling clock offset is proposed in this paper. In the proposed approach, the received signal is oversampled at twice the Nyquist rate and the odd samples are punctured. The symbol timing offset is estimated using pilots and when the symbol timing offset exceeds ±0.5 of sample duration, the puncturing pattern flips between puncturing the odd series and the even series. This in effect, constraints the symbol timing offset within ±1 sample duration. The residual symbol offset can be perfectly corrected using linear phase equaliser. The results show that the proposed method attains a performance comparable to the system that is ideally synchronised provided that the sampling clock offset is lower than 50 ppm.
Starting Page	819
Ending Page	823
File Size	1158939
Page Count	5
File Format	PDF
ISBN	9781457713460
e-ISBN	9781457713484
e-ISBN	9781457713477
DOI	10.1109/PIMRC.2011.6140080
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-11
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Synchronization Receivers Clocks Bit error rate Wireless communication
Content Type	Text
Resource Type	Article

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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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