Browsing by Author "Khattab, Tamer"
Now showing items 21-40 of 126
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Correlated Multiple Antennas Spectrum Sensing under Calibration Uncertainty
( Institute of Electrical and Electronics Engineers Inc. , 2015 , Article)We address the problem of spectrum sensing in cognitive radios (CRs) when the secondary user (SU) is equipped with a multiantenna receiver. We consider scenarios with correlation between the received channels at different ... -
Covid-19: Challenges & Perspectives
( College of Medicine - Qatar University , 2020 , Video)A Virtual Conference to shed light on the QU's prominent trends and research efforts addressing Corona virus. -
Crowd counting Using DRL-based segmentation and RL-based density estimation
( Institute of Electrical and Electronics Engineers Inc. , 2022 , Conference Paper)People counting is one of the computer vision tasks that can be useful for crowd management. In addition, estimating the crowdedness of a surveilled scene for crowd behavior analysis is one of the prominent challenges in ... -
CYBER-ATTACKS AGAINST VOLTAGE PROFILE IN SMART DISTRIBUTION GRIDS WITH HIGHLY-DISPERSED PV GENERATORS: DETECTION AND PROTECTION
(2021 , Master Thesis)In this work, we study the effect of cyber-attacks on voltage regulation in smart grids with highly dispersed photovoltaic (PV) power generators. We picture how the cyber-attacks in the distribution network with the existence ... -
Deep Reinforcement Learning Powered IRS-Assisted Downlink NOMA
( Institute of Electrical and Electronics Engineers Inc. , 2022 , Article)In this work, we examine an intelligent reflecting surface (IRS) assisted downlink non-orthogonal multiple access (NOMA) scenario intending to maximize the sum-rate of users. The optimization problem at the IRS is quite ... -
Detecting Attackers during Quantum Key Distribution in IoT Networks using Neural Networks
( Institute of Electrical and Electronics Engineers Inc. , 2021 , Conference Paper)Internet of Things (IoT) deployments face significant security challenges due to the limited energy and computational power of IoT devices. These challenges are more serious in the quantum communications era, where certain ... -
Detection of temporally correlated primary user signal with multiple antennas
( Springer Verlag , 2015 , Conference Paper)In this paper, we address the problem of multiple antenna spectrum sensing in cognitive radios (CRs) when the samples of the primary user (PU) signal as well as samples of noise are assumed to be temporally correlated. We ... -
DFT-Based Multi-Directions Directional Modulation
( Institute of Electrical and Electronics Engineers Inc. , 2019 , Article)In this letter, a physically secure multi-directions directional modulation scheme is proposed. The scheme provides an adaptive beam-width assignment, where each user is granted a different beam width based on its channel ... -
Directional Modulation for Secure RFID in Health Systems
( Institute of Electrical and Electronics Engineers Inc. , 2020 , Conference Paper)Radio frequency identification (RFID) systems are gaining more attention in new frontiers of applications due to their simplicity, low size factor and low cost of deployment. One of the emerging frontiers of applications ... -
Directional Modulation for Secure RFID in Health Systems
( Institute of Electrical and Electronics Engineers Inc. , 2020 , Conference Paper)Radio frequency identification (RFID) systems are gaining more attention in new frontiers of applications due to their simplicity, low size factor and low cost of deployment. One of the emerging frontiers of applications ... -
Distributed power control for carrier aggregation in cognitive heterogeneous 5G cellular networks
( Springer Verlag , 2015 , Conference Paper)In this paper, we study the distributed optimal power allocation for the carrier aggregation in next generation (5G) cognitive radio networks. The presented study relies on the power control and carrier aggregation principles ... -
Distributed spectrum sensing of correlated observations in cognitive radio networks
(2013 , Conference Paper)In this paper, Collaborative Spectrum Sensing (CSS) as one of the most efficient sensing approaches in Cognitive Radio Networks (CRNs) is investigated when the Secondary Users (SUs) observations are assumed to be correlated. ... -
Dynamic interference-limited relay sharing in cognitive radio networks by using hierarchical modulation
( Institution of Engineering and Technology , 2017 , Article)Sharing a relay in cognitive radio (CR) networks in order to enhance the secondary user's (SU's) performance in an interference-limited scheme is investigated. It is assumed, by utilising hierarchical modulation, a shared ... -
Efficient collaborative spectrum sensing under the smart primary user emulation attacker network
( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)In this paper, collaborative spectrum sensing to detect random signals corrupted by Gaussian noise in the presence of Primary User Emulation Attackers (PUEAs) is studied. We consider smart PUEAs which aims at increasing ... -
Efficient Electromagnetic Analysis and Design Techniques in Jet Engines
(2018 , Dissertation)A statistical electromagnetics based approach is proposed for efficient analysis of electromagnetic propagation inside harsh environments, like jet engines, to establish a communication channel inside the environment. ... -
Efficient FPGA-based implementation of a novel dual mode spectrum sensing technique
(2013 , Conference Paper)Cognitive radio networks require an efficient and reliable method of sensing the spectrum. In this paper, we introduce and implement a new dual mode spectrum sensing technique that is based on combining Quickest Detection ... -
Eigenvalue-Based Multiple Antenna Spectrum Sensing: Higher Order Moments
( Institute of Electrical and Electronics Engineers Inc. , 2017 , Article)The problem of multiple antenna spectrum sensing in cognitive radio (CR) networks is studied in this paper. We propose two new invariant constant false-alarm rate eigenvalue-based (EVB) detectors, using the higher order ... -
Energy Efficient Spectrum Allocation and Mode Selection for D2D Communications in Heterogeneous Networks
( Institute of Electrical and Electronics Engineers Inc. , 2020 , Article)In this paper, we consider a heterogeneous network consisting of both macro Base Station (MBS) and pico Base Stations (PBSs) in order to provide a spectrum allocation and mode selection in device-to-device (D2D) communications. ... -
Energy efficient spectrum allocation and mode selection for mission-critical D2D communications
( Institute of Electrical and Electronics Engineers Inc. , 2016 , Conference Paper)Device-to-device (D2D) communications is considered as a key enabling technology in future cellular networks and thus, it has become an intriguing topic for research. It refers to an innovative technology that enables User ... -
Energy-efficient cooperative relaying protocol for full-duplex cognitive radio users and delay-aware primary users
( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)This paper considers a network in which a primary user (PU) may cooperate with a cognitive radio (CR) user for transmission of its data packets. The PU is assumed to be a buffered terminal operating in a time-slotted ...
