TY - GEN
T1 - Cooperative spectrum sensing and detection for cognitive radio
AU - Unnikrishnan, Jayakrishnan
AU - Veeravalli, Venugopal V.
PY - 2007/12/1
Y1 - 2007/12/1
N2 - One of the main requirements of cognitive radio systems is the ability to reliably detect the presence of licensed primary transmissions. Previous works on the problem of detection for cognitive radio have suggested the necessity of user cooperation in order to be able to detect at the really low signalto-noise ratios experienced in practical situations. We consider a system of cognitive radio users who cooperate with each other in trying to detect licensed transmissions. Assuming that the cooperating nodes use identical energy detectors, we model the received signals as correlated log-normal random variables and study the problem of fusing the decisions made by the individual nodes. We design a linear-quadratic (LQ) fusion strategy based on a deflection criterion for this problem, that takes into account the correlation between the nodes. Our simulation results show that the LQ detector significantly outperforms the counting rule, which is the fusion rule that is obtained by ignoring the correlation.
AB - One of the main requirements of cognitive radio systems is the ability to reliably detect the presence of licensed primary transmissions. Previous works on the problem of detection for cognitive radio have suggested the necessity of user cooperation in order to be able to detect at the really low signalto-noise ratios experienced in practical situations. We consider a system of cognitive radio users who cooperate with each other in trying to detect licensed transmissions. Assuming that the cooperating nodes use identical energy detectors, we model the received signals as correlated log-normal random variables and study the problem of fusing the decisions made by the individual nodes. We design a linear-quadratic (LQ) fusion strategy based on a deflection criterion for this problem, that takes into account the correlation between the nodes. Our simulation results show that the LQ detector significantly outperforms the counting rule, which is the fusion rule that is obtained by ignoring the correlation.
UR - http://www.scopus.com/inward/record.url?scp=39349084874&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=39349084874&partnerID=8YFLogxK
U2 - 10.1109/GLOCOM.2007.563
DO - 10.1109/GLOCOM.2007.563
M3 - Conference contribution
AN - SCOPUS:39349084874
SN - 1424410436
SN - 9781424410439
T3 - GLOBECOM - IEEE Global Telecommunications Conference
SP - 2972
EP - 2976
BT - IEEE GLOBECOM 2007 - 2007 IEEE Global Telecommunications Conference, Proceedings
T2 - 50th Annual IEEE Global Telecommunications Conference, GLOBECOM 2007
Y2 - 26 November 2007 through 30 November 2007
ER -