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Erschienen in:
2018 | OriginalPaper | Buchkapitel
A Spectrum Sensing Scheme with Multiple Users
verfasst von : Junsheng Mu, Xiaojun Jing, Chenchen Sun, Jia Li
Erschienen in: Signal and Information Processing, Networking and Computers
Verlag: Springer Singapore
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Abstract
Spectrum sensing has attracted much concern of researchers due to its significant contribution to the spectral efficiency. However, the corresponding work mainly focuses on the sensing event of single primary users within a certain band and the investigation of the effect of PU traffic on the sensing performance is considered rarely. In this paper, a spectrum sensing scheme is presented to explore the co-existence of multiple users in the same frequency band based on subspace filtering. To remove uncertain noise as much as possible, subspace filtering is applied to the received signal of a cognitive radio, where the received signal is decomposed into two parts: noise subspace and signal-plus-noise subspace. Then the closed-form solution of the detection and false alarm probabilities with multiple users is given on the basis of the signal-plus-noise subspace in Rayleigh fading channel. Eventually, simulations are made to validate the proposed scheme.