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    Author
    Alouini, Mohamed-Slim (2)
    Rezki, Zouheir (2)
    Sboui, Lokman (2)
    Ghazzai, Hakim (1)Department
    Communication Theory Lab (2)
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division (2)
    Electrical Engineering Program (2)Journal2014 12th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt) (1)IEEE Transactions on Wireless Communications (1)PublisherInstitute of Electrical and Electronics Engineers (IEEE) (2)Subjectachievable rate (1)amplify-and-forward relay (1)low power regime (1)MIMO space alignment (1)Nakagami fading (1)View MoreTypeArticle (1)Conference Paper (1)Year (Issue Date)
    2014 (2)
    Item AvailabilityMetadata Only (2)

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    On the throughput of a relay-assisted cognitive radio MIMO channel with space alignment

    Sboui, Lokman; Ghazzai, Hakim; Rezki, Zouheir; Alouini, Mohamed-Slim (2014 12th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt), Institute of Electrical and Electronics Engineers (IEEE), 2014-05) [Conference Paper]
    We study the achievable rate of a multiple antenna relay-assisted cognitive radio system where a secondary user (SU) aims to communicate instantaneously with the primary user (PU). A special linear precoding scheme is proposed to enable the SU to take advantage of the primary eigenmodes. The used eigenmodes are subject to an interference constraint fixed beforehand by the primary transmitter. Due to the absence of a direct link, both users exploit an amplify-and-forward relay to accomplish their transmissions to a common receiver. After decoding the PU signal, the receiver employs a successive interference cancellation (SIC) to estimate the secondary message. We derive the optimal power allocation that maximizes the achievable rate of the SU respecting interference, peak and relay power constraints. Furthermore, we analyze the SIC detection accuracy on the PU throughput. Numerical results highlight the cognitive rate gain achieved by our proposed scheme without harming the primary rate. In addition, we show that the relay has an important role in increasing or decreasing PU and SU rates especially when varying its power and/or its amplifying gain. © 2014 IFIP.
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    Achievable rate of spectrum sharing cognitive radio systems over fading channels at low-power regime

    Sboui, Lokman; Rezki, Zouheir; Alouini, Mohamed-Slim (IEEE Transactions on Wireless Communications, Institute of Electrical and Electronics Engineers (IEEE), 2014-11) [Article]
    We study the achievable rate of cognitive radio (CR) spectrum sharing systems at the low-power regime for general fading channels and then for Nakagami fading. We formally define the low-power regime and present the corresponding closed-form expressions of the achievable rate lower bound under various types of interference and/or power constraints, depending on the available channel state information of the cross link (CL) between the secondary-user transmitter and the primary-user receiver. We explicitly characterize two regimes where either the interference constraint or the power constraint dictates the optimal power profile. Our framework also highlights the effects of different fading parameters on the secondary link (SL) ergodic achievable rate. We also study more realistic scenarios when there is either 1-bit quantized channel feedback from the CL alone or 2-bit feedback from both the CL and the SL and propose simple power control schemes and show that these schemes achieve the previously achieved rate at the low-power regime. Interestingly, we show that the low-power regime analysis provides a specific insight into the maximum achievable rate behavior of CR that has not been reported by previous studies.
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