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Cognitive radio (CR) is viewed as a novel approach for improving the utilization of a precious natural resource: the radio electromagnetic spectrum. Spectrum sensing is a primary task of CR. At first, this article makes an overview of the background and concept of CR. Then focused on spectrum sensing of CR in OFDM, we put forward energy detection based on OFDM. Last this article provides two spectrum...
Based on the characteristics of cognitive radio (CR) and the transmission features of OFDM, this article offers the algorithms for the spectrum allocation in OFDM. Aiming at the probability of detection by the CR and the upper limit of the noise which can be suffered by the authorized user, CR achieves the maximal channel capability through the allocation of the sub-carriers and the power. This article...
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