تصفح حسب المؤلف "Shafie, Ahmed El"
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A sparsity-aware cooperative protocol for cognitive radio networks with energy-harvesting primary user
Shafie, Ahmed El; Al-Dhahir, Naofal; Hamila, Ridha ( IEEE , 2015 , Conference Paper)We consider a cognitive setting composed of multiple primary frequency bands each of which consists of a limited-battery energy-harvesting primary user and a secondary user. The primary user is equipped with a limited-capacity ... -
Cooperative access schemes for efficient SWIPT transmissions in cognitive radio networks
Shafie, Ahmed El; Al-Dhahir, Naofal; Hamila, Ridha ( IEEE , 2015 , Conference Paper)We investigate joint information and energy cooperative schemes in a slotted-time cognitive radio network with a primary transmitter-receiver pair and a set of secondary transmitter-receiver pairs. The primary transmitter ... -
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 ... -
On the design of relay-assisted primary-secondary networks
Shafie, Ahmed El; Sultan, Ahmed; Khattab, Tamer; Poor, H. Vincent ( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)The use of N cognitive relays to assist primary and secondary transmissions in a time-slotted cognitive setting with one primary user (PU) and one secondary user (SU) is investigated. An overlapped spectrum sensing strategy ... -
Sparsity-cognizant multiple-access schemes for large wireless networks with node buffers
Shafie, Ahmed El; Al-Dhahir, Naofal; Hamila, Ridha ( IEEE , 2015 , Conference Paper)This paper proposes efficient multiple-access schemes for large wireless networks based on the transmitters' buffer state information and their transceivers' duplex transmission capability. First, we investigate the case ...