Title :
Cognitive radios methodology for dynamic spectrum allocation in broadband wireless cellular/public safety network systems
Author :
Chihkai Chen ; Kung Yao
Author_Institution :
Dept. of Electr. Eng., Univ. of California, Los Angeles, Los Angeles, CA, USA
Abstract :
The explosive demands of real-time multimedia services in broadband wireless 4G cellular/public safety (PS) network systems impose challenges on efficient spectrum utilization. In this paper, we consider the use of cognitive radio network (CRN) methodology for distributed cooperative spectrum sensing enabling efficient dynamic spectrum allocation and management. CRs join and leave the systems under different conditions. We use the semi-Markov random process to model the dynamic behavior of the number of CR users and log-normal and Pareto distributions to model the cooperation time in the analytical derivation of the dynamic probability mass function of the number of CR´s. Closed form expressions are obtained for the dynamic probabilities of detection and false alarm for cooperative spectrum sensing over fading channels for cellular and PS systems. Several simulations are provided illustrating the usefulness of these models for dynamic spectrum allocation for potential practical system analysis and design.
Keywords :
4G mobile communication; Markov processes; Pareto distribution; broadband networks; cellular radio; cognitive radio; cooperative communication; fading channels; log normal distribution; multimedia communication; probability; radio spectrum management; random processes; safety; CRN methodology; PS network systems; Pareto distributions; broadband wireless 4G cellular network system; closed form expressions; cognitive radio network methodology; distributed cooperative spectrum sensing; dynamic probability mass function; dynamic spectrum allocation; dynamic spectrum management; fading channels; log-normal distributions; probability of detection; probability of false alarm; public safety network systems; real-time multimedia services; semiMarkov random process; spectrum utilization; Dynamic scheduling; Hidden Markov models; Resource management; Safety; Sensors; Wireless communication; Wireless sensor networks; Cognitive radios and CR networks; celluar/public safety network systems; dynamic spectrum sensing/allocation;
Conference_Titel :
Globecom Workshops (GC Wkshps), 2012 IEEE
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4673-4942-0
Electronic_ISBN :
978-1-4673-4940-6
DOI :
10.1109/GLOCOMW.2012.6477562
