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Cooperative Sensing of OFDM Signals using Heterogeneous SensorsAuthors: Akhil Singh,Prakash Gohain,Sachin Chaudhari Conference: National Conference of Communication 2018 Date: 2018-02-25 Report no: IIIT/TR/2018/50 AbstractIn this paper, we investigate a distributed and heterogeneous cognitive radio network (CRN), comprising of secondary users (SUs) employing either energy detector (ED) or autocorrelation detector (AD) to detect the presence or absence of an orthogonal frequencydivision multiplexing (OFDM) based primary user (PU). For the considered heterogeneous cooperative spectrum sensing (CSS), the optimal soft combining rule is derived. The performance of this optimal fusion rule and different hard combining schemes such as OR, AND, and MAJORITY is presented for the case when the noise variance is exactly known. Later, the effect of noise uncertainty is also presented. The proposed heterogeneous CSS is shown to combine the excellent performance of the EDs (when the noise variance is exactly known) and robustness of the ADs to the noise uncertainty. Full paper: pdf Centre for Communications |
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