Browsing by Author "El Shafie A."
Now showing items 1-17 of 17
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A Deep Reinforcement Learning Framework for Data Compression in Uplink NOMA-SWIPT Systems
El Sayed M.; Badawy A.; El Shafie A.; Mohamed A.; Khattab T. ( Institute of Electrical and Electronics Engineers Inc. , 2021 , Article)<comment< Non-orthogonal multiple access (NOMA) shall play an important role in the current and foreseeable design of 5G and beyond networks. NOMA allows multiple users to share the same time-frequency ... -
A Secret-key-aided scheme to secure transmissions from single-antenna RF-eh source nodes
El Shafie A.; Mabrouk A.; Tourki K.; Al-Dhahir N.; Hamila R. ( Institute of Electrical and Electronics Engineers Inc. , 2018 , Article)We propose a two-phase artificial-noise-aided scheme to power a single-antenna energy-harvesting source node (Alice) and secure her transmissions to a multiple-antenna legitimate destination (Bob) in the presence of a ... -
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 ... -
Bio-Waste Aloe vera Leaves as an efficient adsorbent for Titan Yellow from Wastewater: Structuring of a novel adsorbent using Plackett-Burman factorial design
El-Azazy M.; Dimassi S.N.; El-Shafie A.S.; Issa A.A. ( MDPI AG , 2019 , Article)Titan yellow (TY), a triazene azo dye, was removed from contaminated wastewater samples using a green adsorbent recycled from Aloe vera leaves (AV) waste. Two adsorbents were developed-air-dried Aloe vera (ADAV) and thermally ... -
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 ... -
Deep Reinforcement Learning Algorithm for Smart Data Compression under NOMA-Uplink Protocol
Elsayed M.; Badawy A.; El Shafie A.; Mohamed A.; Khattab T. ( Institute of Electrical and Electronics Engineers Inc. , 2020 , Conference Paper)One of the highly promising radio access strategies for enhancing performance in the next generation cellular communications is non-orthogonal multiple access (NOMA). NOMA offers a number of advantages including better ... -
Eco-structured biosorptive removal of basic fuchsin using pistachio nutshells: A definitive screening design-based approach
El-Azazy M.; El-Shafie A.S.; Ashraf A.; Issa A.A. ( MDPI AG , 2019 , Article)Biosorptive removal of basic fuchsin (BF) from wastewater samples was achieved using the recycled agro-wastes of pistachio nut shells (PNS). Seven adsorbents were developed; raw shells (RPNS) and the thermally activated ... -
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 ... -
Interference-based optimal power-efficient access scheme for cognitive radio networks
Anwar A.H.; El Shafie A.; Mohamed A.; Elbatt T.; Guizani M. ( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)In this paper, we propose a new optimization-based access strategy of multi-packet reception (MPR) channel for multiple secondary users (SUs) accessing the primary user (PU) spectrum. We devise an analytical model that ... -
On spectrum sharing between energy harvesting cognitive radio users and primary users
El Shafie A.; Ashour M.; Khattab T.; Mohamed A. ( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)This paper investigates the maximum throughput for a rechargeable secondary user (SU) sharing the spectrum with a primary user (PU) plugged to a reliable power supply. The SU maintains a finite energy queue and harvests ... -
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 ... -
Optimal spectrum access for a rechargeable cognitive radio user based on energy buffer state
El Shafie A.; Ashour M.; Mohamed A.; Khattab T. ( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)This paper investigates the maximum throughput for a rechargeable secondary user (SU) sharing the spectrum with a primary user (PU) plugged to a reliable power supply. The SU maintains a finite energy queue and harvests ... -
Pomegranate peels as versatile adsorbents for water purification: Application of box–behnken design as a methodological optimization approach
El-Azazy M.; Kalla R.N.; Issa A.A.; Al-Sulaiti M.; El-Shafie A.S.; Shomar B.; Al-Saad K.... more authors ... less authors ( John Wiley and Sons Inc. , 2019 , Article)Pomegranate peels (PGP) were tested as a green adsorbent for the removal of Ni(II) from contaminated water samples. Both raw (RPG), and char/burnt peels (BPG) were tested. A multivariate analysis approach, Box–Behnken (BB) ... -
Power-optimal feedback-based random spectrum access for an energy harvesting cognitive user
Ashour M.; El Shafie A.; Mohamed A.; Khattab T. ( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)In this paper, we study and analyze cognitive radio networks in which secondary users (SUs) are equipped with energy harvesting (EH) capability. We design a random spectrum sensing and access protocol for the SU that ... -
Recycling of Date Pits Into a Green Adsorbent for Removal of Heavy Metals: A Fractional Factorial Design-Based Approach
Al-Saad K.; El-Azazy M.; Issa A.A.; Al-Yafie A.; El-Shafie A.S.; Al-Sulaiti M.; Shomar B.... more authors ... less authors ( Frontiers Media S.A. , 2019 , Article)Date pits (DPs) have been recycled into a low-cost adsorbent for removing of selected heavy metals (HMs) from artificially contaminated aqueous solutions. Adsorption of targeted HMs, both by raw date pits (RDP) and burnt ... -
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 ...