NDLI: A robust frequency synchronization method for non-contiguous OFDM-based cognitive radio systems

Content Provider	IEEE Xplore Digital Library
Author	Jie Ding Daiming Qu Li Li
Copyright Year	2012
Description	Author affiliation: Department of Electronics and Information Engineering, Huazhong University of Science and Technology, China (Daiming Qu; Li Li) \|\| Department of Electronic Engineering, Macquarie University, Australia (Jie Ding)
Abstract	For non-contiguous OFDM (NC-OFDM) based cognitive radio systems, one of the significant challenges for a secondary receiver is to establish frequency synchronization without spectrum synchronization information (SSI). In this paper, we propose a robust carrier frequency offset (CFO) estimation method for NC-OFDM receiver when the interference from primary users is considered. The key idea of the proposed method is first to make a decision on which subchannels are active by employing two consecutive and identical training symbols, and then to estimate the CFO effectively by using a maximum likelihood algorithm based on the information on selected active subchannels. Simulation results show that the proposed method can provide a satisfactory estimation accuracy, which is close to the corresponding Cramér-Rao lower bound (CRB) with the ideal SSI over an additive white Gaussian noise (AWGN) channel.
Starting Page	776
Ending Page	780
File Size	5719683
Page Count	5
File Format	PDF
ISBN	9781467311564
e-ISBN	9781467311571
e-ISBN	9781467311557
DOI	10.1109/ISCIT.2012.6381007
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-10-02
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Training Maximum likelihood estimation OFDM Interference Receivers Signal to noise ratio
Content Type	Text
Resource Type	Article

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