Chirp Z transform based spectrum sensing via energy detection

Outage Performance Analysis of Underlay Cognitive Radio Networks with Decode‐and‐Forward Relaying

“…Spectrum utilization can be increased by opportunistically allowing the unlicensed secondary user (SU) to utilize a licensed band in the absence of the primary user (PU) [1][2][3][4]. The ability of providing awareness about the usage of the frequency spectrum or the detection of the PU in a desired frequency band lets the SU access the radio communication channel without causing harmful interference to the PU [5][6][7][8].…”

Performance Analysis of the Differential Evolution and Particle Swarm Optimization Algorithms in Cooperative Wireless Communications

“…Cooperative-diversity relay networks provide a significant performance increment in the radio frequency power transmission and the spatial diversity. They are also shown to be a promising solution to mitigate the signal fading arising from the multipath propagation in wireless communications [15,16]. In the cooperative-diversity networks, relay terminals are employed between the transmitter and receiver nodes, over multiple communications routes, in which two main protocols are used as follows: (i) amplify-and-forward and (ii) DF [15][16][17][18][19][20][21].…”

“…Most of the previous publications have studied the cooperative-diversity performance over different fading channels [15][16][17][18][19][20][21][22][23][24][25][26]. In [15], the authors analyzed the cooperative-diversity network using AF cooperation protocol, operating over independent, but not necessarily identically distributed Nakagami-m fading channels.…”