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  • 1.
    Tran, Hung
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Kaddoum, G.
    University of Québec, ETS Engineering School, LACIME Laboratory, Montreal, Canada.
    Gagnon, F.
    University of Québec, ETS Engineering School, LACIME Laboratory, Montreal, Canada.
    Power allocation for cognitive underlay networks with spectrum band selection2016In: Physical Communication, ISSN 1874-4907, E-ISSN 1876-3219, Vol. 21, p. 41-48Article in journal (Refereed)
    Abstract [en]

    In this paper, we study the cooperative communication of a cognitive underlay network by utilizing the diversity of multiple spectrum bands. In particular, we assume that the transmission power of the secondary user (SU) is subject to different joint constraints, such as peak interference power of the multiple primary users (PUs), peak transmission power of the SU, outage tolerate interference, and outage probability threshold. Accordingly, two power allocation schemes are considered on the basis of the minimum interference channel from the SU to the PU and the channel state information of the primary user link. Furthermore, the SU can select one of the three transmission modes following the channel state conditions, namely as cellular, device-to-device, or switching mode, to transmit the signal to the secondary user receiver. Given this setting, two power allocation schemes over a spectrum band selection strategy are derived. In addition, closed-form expressions for the outage probability of three modes are also obtained to evaluate the performance of the secondary network. Most importantly, a closed-form expression for the peak interference power level of the PU, which is considered as one of the most important parameters to control the SU's transmission power, is derived by investigating the relation of two considered power allocation schemes in the practise. Finally, numerical examples show that the outage performance of secondary network in the switching mode outperforms the one of the cellular and device-to-device (D2D) mode for all considered power allocation schemes.

  • 2.
    Tran, Hung Vinh
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Kaddoum, G.
    University of Québec, France.
    Gagnon, F.
    University of Québec, France.
    Sibomana, L.
    Blekinge Institute of Technology, Karlskrona, Sweden.
    Cognitive radio network with secrecy and interference constraints2017In: Physical Communication, ISSN 1874-4907, E-ISSN 1876-3219, Vol. 22, p. 32-41Article in journal (Refereed)
    Abstract [en]

    In this paper, we investigate the physical-layer security of a secure communication in single-input multiple-output (SIMO) cognitive radio networks (CRNs) in the presence of two eavesdroppers. In particular, both primary user (PU) and secondary user (SU) share the same spectrum, but they face with different eavesdroppers who are equipped with multiple antennas. In order to protect the PU communication from the interference of the SU and the risks of eavesdropping, the SU must have a reasonable adaptive transmission power which is set on the basis of channel state information, interference and security constraints of the PU. Accordingly, an upper bound and lower bound for the SU transmission power are derived. Furthermore, a power allocation policy, which is calculated on the convex combination of the upper and lower bound of the SU transmission power, is proposed. On this basis, we investigate the impact of the PU transmission power and channel mean gains on the security and system performance of the SU. Closed-form expressions for the outage probability, probability of non-zero secrecy capacity, and secrecy outage probability are obtained. Interestingly, our results show that the strong channel mean gain of the PU transmitter to the PU's eavesdropper in the primary network can enhance the SU performance. 

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