In this paper, we investigate the physical layer security of an underlay cognitive decode-and- forward (DF) relay network, in which one secondary transmitter (ST) exchanges confidential information with one secondary destination (SD) with the aid of multiple cognitive DF relays by sharing the licensed spectrum of one primary user (PU), and multiple colluding eavesdroppers attempt to intercept the secondary transmission. Due to deep fading, it is assumed that there is no ST-SD link, one of the cognitive relays is selected to convey the confidential information, while the others emit artificial noise (AN) in an effort to confuse the eavesdroppers. In the absence of the eavesdroppers' channel information state (CSI), we analyze the secrecy outage performance under two opportunistic relay selection schemes, which are the conventional relay selection (CRS) and the best relay selection (BRS) schemes. We derive novel closed-form expressions for the secrecy outage probability with these two relay selection schemes. Simulation results are provided to verify our analysis, and shows that the secrecy performance of the propose BRS scheme significantly outperforms the CRS one.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Relay Selection for Improved Security in Cognitive Relay Networks with Artificial Noise


    Contributors:
    Jia, Shaobo (author) / Zhang, Jiayan (author) / Zhao, Honglin (author) / Xu, Yao (author)


    Publication date :

    2018-06-01


    Size :

    426812 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    A Multiple Relay Selection Scheme in Cognitive Relay Network

    Xu, Jiali / Zhang, Haixia / Yuan, Dongfeng | Springer Verlag | 2012


    Cognitive Heterogeneous Networks with Best Relay Selection over Unreliable Backhaul Connections

    Nguyen, Huy T. / Duong, Trung Q. / Dobre, Octavia A. et al. | IEEE | 2017


    Joint Relay-and-Antenna Selection in Relay-Based MIMO-NOMA Networks

    Zhang, Jian / Ge, Jianhua / Ni, Qiang | IEEE | 2018


    Energy States Aided Relay Selection for Cognitive Relaying Transmission

    Xia, Minghua / Tang, Dong / Jiang, Dandan et al. | IEEE | 2016


    Relay Selection in Power Splitting Based Energy-Harvesting Half-Duplex Relay Networks

    Wang, Dexin / Zhang, Rongqing / Cheng, Xiang et al. | IEEE | 2017