Cognitive Radio Relay Network Performance Analysis by using Game Theory

Cognitive radio plays a vital role in wireless communication. The cognitive radio composed of a transceiver which is used to check the channel vacancy for communication and avoids busy channels by shifting into unused channel. The scope for spectrum vacancy and area of coverage is increased by using cognitive radio. In cooperative relay network to transmit the primary traffic the primary users (PUs) will nominate some of the secondary users (SUs) so as to relay PUs data. To drive the secondary users to co-operate with the primary user, the primary user who owns the channel have to rent some of the channel to the secondary user for relaying PUs data transmission. This cutback the performance of the primary usersand secondary users. Therefore in co-operative cognitive relay network, MIMO system is implemented to increase its performance. Beam formingis used over the MIMO antenna in space domain which permits multiple data streams and minimizes the interference. The game model called Nash Equilibrium is used forpower control in secondary users and PUs and SUs utilities are obtained in MIMO-cooperative cognitive radio network. In multipleinput multiple output technique the secondary users can co-operatively relay the data for the primary users while concurrently accessing the same channel to transmit its own data. To improve the spectrum usage both Time and space domain are examined for arranging the MIMO co-operative cognitive radio networks. IndexTerms—Beamforming,Co-operative cognitive relay network [CCRN], multiple input multiple output [MIMO], Game Theory, Nash Equilibrium (NE). __________________________________________________*****_________________________________________________