“…Apart from adaptive and double threshold-based detection, further improvement in the sensing performance is achieved through optimization. A lot of the existing optimization techniques focus on the cooperative sensing methods via energy detection (Verma and Singh 2015 ; Na 2017 ; Mamisi and Sundru 2018 ; Mabrook et al 2020 , Suneel and Shiyamala 2021 ). A method based on the cooperative spectrum sensing where each CR incorporates and improved energy detector with multiple antennas for Rayleigh fading channels (Verma and Singh 2015 ).…”