Title :
Interference in a Cognitive Network with Beacon
Author :
Vu, Mai ; Ghassemzadeh, Saeed S. ; Tarokh, Vahid
Author_Institution :
Harvard Univ., Cambridge
fDate :
March 31 2008-April 3 2008
Abstract :
We study a cognitive network consisting of multiple cognitive users communicating in the presence of a single primary user. The primary user is located at the center of the network, and the cognitive users are uniformly distributed within a circle around the primary user. Assuming a constant cognitive user density, the radius of this circle will increase with the number of users. We consider a scheme in which the primary transmitter sends a beacon signaling its own transmission. The cognitive users, upon receiving this beacon, stay silent. Because of channel fading, however, there is a non-zero probability that a cognitive user misses the beacon and hence, with a certain activity factor, transmits concurrently with the primary user. Given the location of the primary receiver, we are interested in the total interference caused by the cognitive users to this receiver. In particular, we provide closed-form bounds on the mean and variance of the interference, and relate them to the outage probability on the primary user. These analytical results can help in the design of a cognitive network with beacon.
Keywords :
cognitive radio; fading channels; multiuser channels; probability; radiofrequency interference; beacon signaling; channel fading; cognitive network; multiple cognitive users; nonzero probability; total interference; Cognitive radio; Communications Society; Fading; Licenses; Multiple access interference; Performance analysis; Power system modeling; Radio transmitters; Upper bound; Wireless networks;
Conference_Titel :
Wireless Communications and Networking Conference, 2008. WCNC 2008. IEEE
Conference_Location :
Las Vegas, NV
Print_ISBN :
978-1-4244-1997-5
DOI :
10.1109/WCNC.2008.160