查看文章

Performance of a cooperative spectrum sensing with the help of a multi antenna based cognitive relay (CR) is analyzed in this paper. A cognitive coordinator (CC) equipped with an energy detector makes a final decision regarding primary user (PU) with the help of a cognitive relay. The cognitive relay employs maximal ratio combining (MRC) on the signals received from PU via multiple receiving antenna and forwards the sensing information PU to CC using decode and forward (DF) protocol. The CC also uses MRC to combine the two signals: one received directly from PU and the other relayed by CR. Closed form expressions for probability of detection and probability of false alarm are derived for the proposed multi antenna based decode and forward cooperative spectrum sensing scheme ( i.e. DF-CSS) using energy detector at CC where all the channels i.e. sensing channel, channel between PU and CR, and …