Optimal Uplink Access in Cognitive Femtocell Networks with Adaptive Modulation

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Article number7435240
Pages (from-to)1050-1053
Journal / PublicationIEEE Communications Letters
Issue number5
Publication statusPublished - 1 May 2016


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.

Research Area(s)

  • adaptive modulation, Cognitive femtocells, imperfect spectrum sensing, throughput