What is CR (Cognitive radio)?

In Cognitive radio (CR), the transmitter/receiver can examine which communication channels are utilized and which are not. The transceiver then immediately moves into vacant channels, while avoiding occupied ones. This optimizes the utilization of accessible radio-frequency (RF) spectrum. It likewise reduces impedance to different users. By staying away from occupied channels, it expands spectrum proficiency and enhances the quality of service (QoS) for subscribers.