Reusability of spectrum in Cognitive radio network using threshold

With the rapid increase and rise in the technology in a wireless domain since the early nineties, the major bottleneck as regards to the scare radio resource could be resolved by an emerging radio technology Cognitive radio (CR). It has also become obvious that the most important resources for the wireless communication require a much better way of exploiting the ether medium frequency spectrum for the future generation of radio and wireless communication. In order to increase the spectrum efficiency the cognitive users to whom bands have not been licensed can access the frequency band dynamically in an opportunistic manner by supporting the spectrum reuse functionality, thereby sensing the radio frequency environment until the primary users are inactive. In this article we have calculated the activity factor of secondary user for a threshold value of the total spectrum usage. Further a relationship between the detection sensitivity, threshold and activity of secondary users could be established by keeping in view of the transmitted parameters. Dynamic spectrum access technique allows the user to operate in the best available channel in terms of the application requirement and available spectrum pool characteristic like channel capacity, possible interference, path loss, possible channel holding time etc.