Title :
Collaborative channel search in cognitive radio networks
Author :
Fazeli-Dehkordy, Siavash ; Plataniotis, Konstantinos N. ; Pasupathy, Subbarayan
Author_Institution :
Edward S. Rogers Sr. Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON, Canada
Abstract :
We consider a scenario where multiple collaborating cognitive radios (CR´s) try to jointly detect spectrum opportunities in a wide-band spectrum within a predefined spectrum sensing time TS. Each CR is equipped with a tunable bandpass filter (BPF) and is able to sense one frequency band (channel) at a time. The sensing time consists of L sensing slots of length T. During each sensing slot, each of the collaborating CR´s is assigned to sense one of the primary channels and report its observation to the other CR´s. The goal is to maximize the expected number of identified idle channels by optimally choosing the channels to be sensed by each of the collaborating CR´s at each sensing slot. We derive closed-form solutions for an optimal spectrum sensing policy and the associated reward function for the case of two collaborating CR´s where individual sensing decisions are fused together according to the OR-rule. We show that the gain due to the optimal sensing policy is more significant when the spectrum utilization is high.
Keywords :
band-pass filters; channel allocation; cognitive radio; BPF; cognitive radio network; collaborative channel search; optimal spectrum sensing policy; spectrum sensing time; tunable bandpass filter; wide-band spectrum; Collaboration; Detectors; Fading; Gain; Time frequency analysis; Transmitters;
Conference_Titel :
Personal Indoor and Mobile Radio Communications (PIMRC), 2011 IEEE 22nd International Symposium on
Conference_Location :
Toronto, ON
Print_ISBN :
978-1-4577-1346-0
Electronic_ISBN :
pending
DOI :
10.1109/PIMRC.2011.6139979