3rd International ICST Conference on COMmunication System SoftWAre and MiddlewaRE

Research Article

Power Allocation Schemes for Cognitive Radios

  • @INPROCEEDINGS{10.1109/COMSWA.2008.4554378,
        author={Arpita Guha and Viswanath  Ganapathy},
        title={Power Allocation Schemes for Cognitive Radios},
        proceedings={3rd International ICST Conference on COMmunication System SoftWAre and MiddlewaRE},
  • Arpita Guha
    Viswanath Ganapathy
    Year: 2008
    Power Allocation Schemes for Cognitive Radios
    DOI: 10.1109/COMSWA.2008.4554378
Arpita Guha1,*, Viswanath Ganapathy2,*
  • 1: TeNeT Group, Electrical Engineering Department Indian Institute of Technology Madras, India
  • 2: Honeywell Technology Solutions Lab Bangalore, India
*Contact email: arpita@tenet.res.in, Viswanath.Ganapathy@honeywell.com


Coexistence of one or more cognitive radios with a primary radio where the cognitive radios transmit in a spectrum allocated to the primary radio has been investigated in this paper. We consider two distinct scenarios: one in which the cognitive radios give higher priority to one of the cognitive radios and a second in which all the cognitive radios compete to get maximum possible data rates for themselves. In first scenario, the cognitive radio with higher priority gets a choice to decide how much of available resources it wants to use, and rest of the cognitive radios scavenge the left-over resources. We propose power allocation strategies to be used by the radios under both scenarios. We show that proposed power allocation strategy to be used in the first and cooperative scenario leads to overall system capacity improvement. We also prove convergence of power allocation algorithm proposed for the second and greedy scenario. In both cases the cognitive radios ensure that sum of interference caused by them in the spectrum remains below interference threshold.