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To attenuate the channel fading effects, a spectrum sensing policy for coordinating a cooperative sensing is proposed by adding a Hopping Sequence (HS) module to the detectors based on a fuzzy logic system (FLS). A significant effect on the spectrum efficiency is the ability of a secondary user (SU) to utilize a frequency slot for transmission in an idle channel. Hence, the SU needs to sense the related spectrum in order to classify a licensed frequency band as occupied or vacant. To implement the HS module, two hopping methods are proposed-Random Hopping (RA-H) and Sequential Hopping (SE-H). An enhancement in detection probability over conventional cooperative sensing has been achieved.

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Cognitive Radio (CR) and Internet of Things (IoT) is an effective step into the smart technology world. Several frameworks are proposed to build CR and IoT. The phases of the interconnection between IoT and CR is; spectrum sensing, spectrum sharing, and spectrum management. This paper presents a survey of CR based IoT and mentions some previous works. It highlights with details the spectrum sensing stage for both narrowband and wideband.