Abstract
Due to the ever growing need for spectrum, the cognitive radio (CR) has been proposed to improve the radio spectrum utilization. In this scenario, the secondary users (SU) are permitted to share spectrum with the licensed primary users (SU) with a strict condition that they do not cause harmful interference to the cognitive network. In this work, we have proposed an interference model for cognitive radio network that utilizes power or contention control interference management schemes. We derived the probability density function (PDF) with the power control scheme, where the power of transmission of the CR transmitter is guided by the power control law and also with contention control scheme that has a fixed transmission power for all CR transmitter controlled by a contention control protocol. This protocol makes a decision on which CR transmitter can transmit at any point in time. In this work, we have shown that power and contention control schemes are good candidates for interference modeling in cognitive radio system. The impact of the unknown location of the primary receiver on the resulting interference generated by the CR transmitters was investigated and the results shows that the challenges of the hidden primary receivers lead to higher CR-primary interference in respect to higher mean and variance. Finally, the presented results show power control and the contention control scheme are good candidates in reducing the interference generated by the cognitive radio network.
Highlights
In wireless communication, the availability of spectrum has become scarce due to the rapid growth of wireless communication devices
In other to make use of the underutilized spectrum resource, the cognitive radio (CR) technology was proposed [2,3,4,5] because it allows communication between unlicensed users which is known as secondary user (SU) and the licensed users otherwise known as the primary users (PU) without causing any harmful interference
We have investigated how the unknown location of the primary receiver affects the interference in both the power control and contention schemes
Summary
The availability of spectrum has become scarce due to the rapid growth of wireless communication devices. In other to make use of the underutilized spectrum resource, the cognitive radio (CR) technology was proposed [2,3,4,5] because it allows communication between unlicensed users which is known as secondary user (SU) and the licensed users otherwise known as the primary users (PU) without causing any harmful interference. The frequency-domain are modeled using a twodimensional poison point process, details on the frequency domain are emphasized in [16,17] Another category of the interference modeling is the accumulated interference, the CR user have to give a guarantee that they would not cause harmful interference to the PU. We studied power and contention control interference management scheme as a good candidate for interference modeling in cognitive radio.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
