تصفح Electrical Engineering حسب المؤلف "El Shafie A."
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Band allocation for cognitive radios with buffered primary and secondary users
El Shafie A.; Sultan A.; Khattab T. ( Institute of Electrical and Electronics Engineers Inc. , 2016 , Conference Paper)In this paper, we study band allocation of Ms buffered secondary users (SUs) to Mp orthogonal primary licensed bands, where each primary band is assigned to one primary user (PU). Each SU is assigned to one of the available ... -
Centralized and Distributed Cognitive Relay-Selection Schemes for SWIPT Cognitive Networks
Salama A.M.; Samy I.; El Shafie A.; Mohamed A.; Khattab T. ( Institute of Electrical and Electronics Engineers Inc. , 2019 , Article)We investigate the model of a single primary-transceiver pair with multiple secondary-transceiver pairs. The secondary pairs can act as relays for the primary transmitter enabling access to its channel resources. Each ... -
Energy-efficient cooperative cognitive relaying schemes for cognitive radio networks
El Shafie A.; Khattab T.; El-Keyi A. ( Elsevier B.V. , 2018 , Article)We investigate a cognitive radio network in which a primary user (PU) may cooperate with a cognitive radio user (i.e., a secondary user (SU)) for transmissions of its data packets. The PU is assumed to be a buffered node ... -
Impact of Passive and Active Security Attacks on MIMO Smart Grid Communications
El Shafie A.; Chihaoui H.; Hamila R.; Al-Dhahir N.; Gastli A.; Ben-Brahim L.... more authors ... less authors ( Institute of Electrical and Electronics Engineers Inc. , 2019 , Article)We consider multiple source nodes (consumers) communicating wirelessly their energy demands to the meter data-management system (MDMS) over the subarea gateway(s). We quantify the impact of passive and active security ... -
On the Performance of Quickest Detection Spectrum Sensing: The Case of Cumulative Sum
Badawy A.; El Shafie A.; Khattab T. ( Institute of Electrical and Electronics Engineers Inc. , 2020 , Article)Quickest change detection (QCD) is a fundamental problem in many applications. Given a sequence of measurements that exhibits two different distributions around a certain flipping point, the goal is to detect the change ... -
Thresholds optimization for one-bit feedback multi-user scheduling
Hafez M.; El Shafie A.; Shaqfeh M.; Khattab T.; Alnuweiri H.; Arslan H.... more authors ... less authors ( Institute of Electrical and Electronics Engineers Inc. , 2018 , Article)We propose a new one-bit feedback scheme with scheduling decision based on the maximum expected weighted rate. We show the concavity of the 2-user case and provide the optimal solution which achieves the maximum weighted ...