Title :
Service coverage for cognitive radio networks with cooperative relays in shadowed hotspot areas
Author :
Ku, Meng-Lin ; Chen, Qingchun ; Ghassemzadeh, Saeed S. ; Tarokh, Vahid ; Wang, Li-Chun
Abstract :
In this paper, we investigate the service coverage for interweaving cognitive radio networks with cooperative relays in shadowed areas within the metropolitan region. We highlight the influence of relays on the primary and secondary systems in severe shadow fading channels. The outage probability is utilized as a comprehensive performance metric to characterize the coverage quality for the cognitive radio system with relays. We show that cooperative spectrum sensing among the secondary transmitter and relays can improve the vacant spectrum detection probability and the false alarm probability, thereby making the additionally introduced interference by relays to be constrained within a tolerable limit. Overall, our analysis unveils that both the spectrum utilization rate and the spatial coverage can be significantly improved through the use of the relays, and there exists the spatial selectivity phenomena for both the primary and secondary systems.
Keywords :
cognitive radio; cooperative communication; fading channels; interference suppression; radio transmitters; telecommunication network reliability; telecommunication network routing; cooperative relays; cooperative spectrum sensing; false alarm probability; interweaving cognitive radio networks; metropolitan region; outage probability; primary systems; relay interference; secondary systems; secondary transmitter; service coverage; severe shadow fading channels; shadowed hotspot areas; spatial selectivity phenomena; vacant spectrum detection probability; Cognitive radio; Decoding; Interference; Radio transmitters; Relays; Sensors; Shadow mapping;
Conference_Titel :
Wireless Communications and Networking Conference (WCNC), 2011 IEEE
Conference_Location :
Cancun, Quintana Roo
Print_ISBN :
978-1-61284-255-4
DOI :
10.1109/WCNC.2011.5779428