Bilişsel radyoda spektrum paylaşımının performans takibi

Due to the phenomenon of fixed spectrum allocation (FSA), the spectrum management failed to satisfy the demands of new, technologies that are always evolving. However, cognitive radio (CR) is employed for utilization improvement in the spectrum and resource deficiency completion. Day by day, the number of radio spectrum users is increasing, as new technologies are being introduced in all sectors of human life. Therefore, even the users of licensed bands are demanding a larger radio spectrum. In order to balance radio spectrum congestion, users can get assigned to other bands. In this thesis, radio spectrum is sensed for hole detection and secondary (or ''unlicensed'') user (SU) assignment. SUs are participating in the white band either by transmitting alongside primary (or ''licensed'') users (PUs) or by waiting to transmit until the hole becomes vacant. The behavior of PUs during the period of transmission is studied in order to determine the spectrum occupancy status. The activity of PUs is simulated in the form of random variables due to the occurrence of uncertain behaviors. Issues such as channel noise and fading effects interrupt spectrum sensing, thereby making spectrum holes appear busy. The CR network is modelled in Matlab software such that both PUs and SUs can sense the spectrum through the Energy Detection Method and share the spectrum effectively by employing the approach to estimate waiting time, which highlights behaviors and activity matrices. Candidates have to share the spectrum, thereafter which transmission delay and throughput are examined for the instances where underlay and interweave spectrum sharing techniques are in use. A time-estimator algorithm is used to reduce the computing budget and latency in order to obtain a trade-off between throughput and transmission delay.