scholarly journals Outage performance of underlay cognitive radio networks over mix fading environment

2021 ◽  
Vol 11 (3) ◽  
pp. 2019
Author(s):  
Nguyen Hong Nhu ◽  
Cuu_Ho Van ◽  
Van-Duc Phan ◽  
Tan N. Nguyen ◽  
Miroslav Voznak ◽  
...  
Keyword(s):  
Cognitive Radio ◽  
Fading Channels ◽  
System Performance ◽  
Relay Node ◽  
Ergodic Capacity ◽  
Radio Networks ◽  
Closed Form Expression ◽  
Destination Node ◽  
Secondary Source ◽  
Underlay Cognitive Radio

In this paper, the underlay cognitive radio network over mix fading environment is presented and investigated. A cooperative cognitive system with a secondary source node S, a secondary destination node D, secondary relay node Relay, and a primary node P are considered. In this model system, we consider the mix fading environment in two scenarios as Rayleigh/Nakagami-m and Nakagami-m/Rayleigh Fading channels. For system performance analysis, the closed-form expression of the system outage probability (OP) and the integral-formed expression of the ergodic capacity (EC) are derived in connection with the system's primary parameters. Finally, we proposed the Monte Carlo simulation for convincing the correctness of the system performance.

scholarly journals Secrecy Performance Enhancement for Underlay Cognitive Radio Networks Employing Cooperative Multi-Hop Transmission with and without Presence of Hardware Impairments

Entropy ◽  
2019 ◽  
Vol 21 (2) ◽  
pp. 217 ◽  
Author(s):  
Phu Tran Tin ◽  
Dang The Hung ◽  
Tan Nguyen ◽  
Tran Duy ◽  
Miroslav Voznak
Keyword(s):  
Cognitive Radio ◽  
Fading Channels ◽  
Cognitive Radio Networks ◽  
Radio Networks ◽  
Secondary Source ◽  
Secrecy Outage Probability ◽  
Transmission Protocol ◽  
Transmit Power ◽  
Underlay Cognitive Radio ◽  
Hardware Impairment

In this paper, we consider a cooperative multi-hop secured transmission protocol to underlay cognitive radio networks. In the proposed protocol, a secondary source attempts to transmit its data to a secondary destination with the assistance of multiple secondary relays. In addition, there exists a secondary eavesdropper who tries to overhear the source data. Under a maximum interference level required by a primary user, the secondary source and relay nodes must adjust their transmit power. We first formulate effective signal-to-interference-plus-noise ratio (SINR) as well as secrecy capacity under the constraints of the maximum transmit power, the interference threshold and the hardware impairment level. Furthermore, when the hardware impairment level is relaxed, we derive exact and asymptotic expressions of end-to-end secrecy outage probability over Rayleigh fading channels by using the recursive method. The derived expressions were verified by simulations, in which the proposed scheme outperformed the conventional multi-hop direct transmission protocol.

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