Carrier frequency offset estimation for non-contiguous OFDM receiver in cognitive radio systems

Jie Ding*, Eryk Dutkiewicz, Xiaojing Huang, Daiming Qu, Tao Jiang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

1 Citation (Scopus)


For non-contiguous (NC) OFDM based cognitive radio (CR) systems, schemes have been developed in literature to acquire spectrum synchronization information (SSI) with perfect carrier frequency offset (CFO) synchronization. However, OFDM is extremely sensitive to the CFO in practice, which leads to inter-carrier interference (ICI), hence degrading the spectrum synchronization performance for existing schemes. An accurate CFO estimation is therefore required before setting up the SSI. In this paper, we present a novel scheme based on the maximum likelihood (ML) algorithm to estimate the CFO for the NC-OFDM receiver when the SSI is unknown. A corresponding Cramér-Rao lower bound (CRB) with the ideal SSI is derived to demonstrate the efficiency of the proposed scheme. Simulation results show that the proposed scheme is robust against interference and achieves a satisfactory accuracy of estimation, which is close to the relevant CRB.

Original languageEnglish
Title of host publication2013 IEEE Global Communications Conference, GLOBECOM 2013
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages6
ISBN (Electronic)9781479913527
ISBN (Print)9781479913534, 9781479913510
Publication statusPublished - 2013
EventIEEE Global Communications Conference (GLOBECOM) - Atlanta, United States
Duration: 9 Dec 201313 Dec 2013

Publication series

NameIEEE Global Communications Conference
ISSN (Print)2334-0983


ConferenceIEEE Global Communications Conference (GLOBECOM)
CountryUnited States

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