A Double Threshold-Based Cooperative Spectrum Sensing With Novel Hard-Soft Combining Over Fading Channels

In this letter, a double threshold-based log-likelihood ratio (LLR) detector with a novel hard-soft combining rule (DT-LLR-HSC) is proposed for spectrum sensing in cooperative cognitive radio networks (CRNs) under the block Rayleigh fading scenario. A novel weighted hard-soft combining scheme is adopted at the fusion center to combine local binary/energy information resulting in global binary decision. A trust-based novel weight vector...