Pilot Periodicity Based OFDM Signal Detection Method for Cognitive Radio System

Sung Hwan SOHN
Ning HAN
Guanbo ZHENG
Jae Moung KIM

IEICE TRANSACTIONS on Communications   Vol.E91-B    No.5    pp.1644-1647
Publication Date: 2008/05/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.5.1644
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
cognitive radio,  OFDM detection,  cyclostationary detection,  spectral correlation detection,  

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Cognitive Radio is an advanced enabling technology for efficient utilization of vacant spectrum due to its ability to sense the spectrum environment. Various detection methods have been proposed for spectrum sensing, which is the key function in implementing cognitive radio. However most of the existing methods put their interests in detecting TV signal and wireless microphone signals. In this paper, we explore the periodicity of the equally spaced pilot subcarriers in OFDM signal. Simulations in various fading environments show that the proposed cyclostationarity based detection method works well for OFDM signal.