Title :
Cross-layer dynamic rate adaptations for green cognitive radio networks
Author :
Karmokar, Ashok K. ; Anpalagan, Alagan
Author_Institution :
Dept. of Electr. & Comput. Eng., Ryerson Univ., Toronto, ON, Canada
Abstract :
We investigate cross-layer rate adaptation techniques for a secondary user (SU) equipped with a finite buffer in green cognitive radio networks. We assume that the activity statistics of the licensed primary users (PUs) channels are independent and identically distributed, and a SU detects their states using a spectrum sensing method. We formulate the problem as an infinite-horizon partially observable Markov decision process (POMDP). The policy is obtained using maximum-likelihood heuristic policy (MLHP) technique. We assume that the transition probabilities of the PUs and the fading channel between the SU´s transmitter and receiver are known, but the exact PU´s states are hidden. By tracking belief of the hidden states, the SU takes decision on the rate and corresponding power to minimize energy consumption with constraints on delay and bit error rate. Numerical results are given to show the performance of the proposed MLHP, which is found to perform very close to fully observable optimal policy. We also show pointer to choose design parameter so that the scheduler becomes the most energy-efficient for given quality of service requirements of the application.
Keywords :
Markov processes; cognitive radio; error statistics; fading channels; maximum likelihood estimation; quality of service; radio receivers; radio transmitters; signal detection; MLHP; POMDP; bit error rate; cross-layer dynamic rate adaptation; fading channel; finite buffer; fully observable optimal policy; green cognitive radio networks; licensed primary users; maximum likelihood heuristic policy; partially observable Markov decision process; quality of service; secondary user; spectrum sensing method; transition probability;
Conference_Titel :
Global Communications Conference (GLOBECOM), 2012 IEEE
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4673-0920-2
Electronic_ISBN :
1930-529X
DOI :
10.1109/GLOCOM.2012.6503635