Abstract
In the cognitive radio (CR) systems, channel sensing policy to detect the presence of primary user directly affects the quality-of-service (QoS) of both primary and CR users. In this paper, we investigate the efficient channel sensing scheme for the orthogonal frequency division multiple access (OFDMA) based CR systems. To improve the overall system performance, the proposed scheme exploits the multiuser-diversity in the frequency-selective fading channel, considering various types of the primary users. Performance of the proposed scheme is evaluated by simulation. Numerical results show that the proposed scheme can increase the utilization of the CR system while reducing the waiting time of the primary user.
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
