Comparative Analysis of Performance of a Developed Energy-efficient Optimal Frequency System Versus Existing Overlay and Underlay Approaches

This paper proposed an effective switching technique betweenOverlay Cognitive Radio (OCR) and Underlay Cognitive Radio (UCR) in a wireless communication system.The availability of white or brown space is achieved using energy detector and the system switches to overlay approach when there is presence of white space, and instantly switches to underlay approach when there is presence of brown space based on the switching algorithm.Also, Hybrid Decode Amplify and Forward (H-DAF) cooperative relay technique is incorporated to enhance the coverage area of the cognitive user.During the underlay approach, the received signal at the relay node is decoded, amplified, and coded using CDMA before forwarding to the CU receiver.The proposed spectrum management system is simulated using MATLAB R2021a and evaluated using Throughput (TP) and Spectral Efficiency (SE) by comparing with the existing overlay and underlay CR approach.The simulated outcomes showed the designed system demonstrated improved switching system and performances than the existing techniques with highest TP and SE values and can be adopted in wireless communication designs for effective frequency spectrum usage.