Abstract
In this letter, cognitive two-tier femtocell networks are considered, where each femtocell transmits over subchannels that are considered idle by spectrum sensing. Since femtocells transmit on the “idle” subchannels based on imperfect cognitive sensing, co-tier and cross-tier interference will arise. We derive the average uplink throughput of cognitive femtocell networks, where fractional power control and adaptive modulation are adopted. Besides, by maximizing the system throughput, the optimal channel access probability of each femtocell is obtained. Simulation results verify the validity of the analysis.
Sign-in/Register to access full text options 
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
