Throughput of cooperative HARQ protocols for underlay cognitive radio networks using adaptive and fixed transmit power

2019 ◽  
Vol 32 (3) ◽  
pp. 147 ◽  
Author(s):  
Nadhir Ben Halima ◽  
Hatem Boujemâa
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radio Networks ◽  
Radio Networks ◽  
Transmit Power ◽  
Underlay Cognitive Radio

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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