Secure beamforming for cognitive radio networks with artificial noise

Yanan Wu, Xiaoming Chen, Xianfu Chen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    7 Citations (Scopus)

    Abstract

    In this paper, we address the secrecy problem for a cognitive radio network (CRN) by using physical layer security (PHY-security) technology. In order to effectively enhance wireless security, we propose to adopt artificial noise (AN) to impair the quality of the interception signal. For such a secure CRN, it is a challenging issue to design the beams for both the desired signal and the AN, so as to maximize the secrecy rate while satisfying the interference constraint to primary user (PU). Since the formulated problem is nonconvex, we adopt an alternative optimization method combined with one-dimensional linear searching to design optimal secure beams. Furthermore, we propose a low-complexity secure beamforming scheme by confining the AN in the orthogonal space of the legitimate channel. It is found that the low-complex scheme can asymptotically approach the same performance as the optimal one, when the number of antennas is large. Finally, simulation results validate the effectiveness of the two proposed schemes.
    Original languageEnglish
    Title of host publication Wireless Communications & Signal Processing (WCSP), 2015 International Conference on
    PublisherIEEE Institute of Electrical and Electronic Engineers
    Pages1-5
    ISBN (Electronic)978-1-4673-7687-7, 978-1-4673-7686-0
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA4 Article in a conference publication
    Event7th International Conference on Wireless Communications and Signal Processing, WCSP 2015 - Nanjing, China
    Duration: 15 Oct 201517 Oct 2015

    Conference

    Conference7th International Conference on Wireless Communications and Signal Processing, WCSP 2015
    Abbreviated titleWCSP 2015
    CountryChina
    CityNanjing
    Period15/10/1517/10/15

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    Keywords

    • array signal processing
    • interference constraints
    • optimization
    • cognitive radio
    • communication system security
    • antennas

    Cite this

    Wu, Y., Chen, X., & Chen, X. (2015). Secure beamforming for cognitive radio networks with artificial noise. In Wireless Communications & Signal Processing (WCSP), 2015 International Conference on (pp. 1-5). IEEE Institute of Electrical and Electronic Engineers . https://doi.org/10.1109/WCSP.2015.7341139