Cognitive radio channel with cooperative multi-antenna secondary systems

Jung Hoon Noh, Seong Jun Oh

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)

    Abstract

    Recently, a cooperative cognitive radio network (CCRN) and multiple-input multiple-output (MIMO) cognitive radio (CR) network have been proposed and investigated individually as promising paradigms for CR networks. Herein, we consider applying the MIMO techniques to a CCRN in order to achieve increased spectral efficiency. Assuming that the system comprises a single-input single-output (SISO) primary user (PU) pair and a multi-input single-output (MISO) secondary user (SU) pair, we propose jointly optimizing the beamforming vector and power allocation for the SU transmitter in order to maximize the rate for the SU while meeting the rate requirement for the PU. As the problem is nontrivial, we circumvent it using the uplink and downlink duality and equality of the left and right eigenvalues. Further, we introduce an iterative algorithm with a proof of convergence. From the numerical results, the proposed algorithm converges in a small number of iterations and outperforms the zero-forcing (ZF) beamforming algorithm while providing an upper bound for the CCRN-MIMO performance. Furthermore, the application of the proposed algorithm is not limited to CCRN-MIMO; it can also be extended to the conventional relay MIMO and/or MU-MIMO with a quality-of-service (QoS) requirement.

    Original languageEnglish
    Article number6678833
    Pages (from-to)539-549
    Number of pages11
    JournalIEEE Journal on Selected Areas in Communications
    Volume32
    Issue number3
    DOIs
    Publication statusPublished - 2014 Mar

    Keywords

    • Cooperative communication
    • beamforming
    • cognitive radio (CR)
    • cooperative cognitive radio network (CCRN)
    • multiple-input multiple-output (MIMO)

    ASJC Scopus subject areas

    • Computer Networks and Communications
    • Electrical and Electronic Engineering

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