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    Browsing by Subject "cooperative communications"

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      • A survey on uplink resource allocation in OFDMA wireless networks 

        Yaacoub, Elias; Dawy, Zaher ( IEEE , 2012 , Article Review)
        OFDMA has been selected as the multiple access scheme for state-of-the-art wireless communication systems. Efficient resource allocation in OFDMA wireless networks is essential in order to meet the quality of service ...
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        Distributed turbo coding using log-likelihood thresholding for cooperative communications 

        Al-Habian, G.; Ghrayeb, A.; Hasna, M.O.; Abu-Dayya, A. ( IEEE , 2009 , Article)
        In cooperative communications, error propagation at relays reduces the diversity order of the system. To combat that effect, we present a novel technique to control error propagation at the relays, which is presented in ...
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        Exploiting sparsity of relay-assisted cognitive radio networks 

        El Shafie, Ahmed; Al-dhahir, Naofal; Hamila, Ridha ( IEEE , 2015 , Conference)
        We propose a novel protocol for secondary users based on compressive sensing principles. The secondary user assigned to one of the primary frequency bands is aided by a set of nearby secondary users, which we refer to as ...
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        On the coexistence of a primary user with an energy harvesting secondary user: A case of cognitive cooperation 

        Shafie, Ahmed El; Khattab, Tamer; El-Keyi, Amr; Nafie, Mohamed ( John Wiley and Sons Ltd , 2016 , Article)
        In this paper, we consider a cognitive scenario where an energy harvesting secondary user shares the spectrum with a primary user. The secondary source helps the primary source in delivering its undelivered packets during ...
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        Relay-Assisted Primary and Secondary Transmissions in Cognitive Radio Networks 

        El Shafie, Ahmed; Khattab, Tamer; Sultan Salem, Ahmed ( Institute of Electrical and Electronics Engineers Inc. , 2016 , Article)
        We assume a set of cognitive relay nodes that assists both primary and secondary transmissions in a time-slotted cognitive radio networks. To regulate the channel access of the various nodes in the network, we propose an ...

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