Nabil Giweli, Seyed Shahrestani, Hon Cheung, Western Sydney University, Australia

Cognitive Radio (CR) technology opens the door for the opportunistic use of the licensed spectrum to partially address the issues relevant to the limited availability of unlicensed frequencies. Combining CR and Wi-Fi to form the so called White-Fi networks, has been proposed for achieving higher spectrum utilization. This paper discusses the spectrum sensing in White-Fi networks and the impacts that they have on the QoS of typical applications. It also reports the analysis of such impacts through various simulation studies. We also propose such a sensing strategy that can adapt to the IEEE 802.11e requirements. The proposed strategy aims to enhance overall QoS while maintaining efficient sensing. Simulation results of the proposed mechanism demonstrate a noticeable improvement in QoS.

Cognitive Radio, Spectrum Sensing, White-Fi, IEEE 802.11af, IEEE 802.11e, QoS.