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

Jie Ding*, Daiming Qu, Li Li

*Corresponding author for this work

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

2 Citations (Scopus)

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.

Original languageEnglish
Title of host publication2012 International Symposium on Communications and Information Technologies, ISCIT 2012
Pages776-780
Number of pages5
DOIs
Publication statusPublished - 2012
Event2012 International Symposium on Communications and Information Technologies, ISCIT 2012 - Gold Coast, QLD, Australia
Duration: 2 Oct 20125 Oct 2012

Other

Other2012 International Symposium on Communications and Information Technologies, ISCIT 2012
CountryAustralia
CityGold Coast, QLD
Period2/10/125/10/12

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