تصفح حسب المؤلف "Al-Dhahir, Naofal"
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Impact of the Wireless Network's PHY Security and Reliability on Demand-Side Management Cost in the Smart Grid
El Shafie, Ahmed; Niyato, Dusit; Hamila, Ridha; Al-Dhahir, Naofal ( Institute of Electrical and Electronics Engineers Inc. , 2017 , Article)We investigate the impact of the wireless network's physical layer (PHY) security and reliability on demand-side management operation in the smart grid. We assume that consumers communicate their energy demands with the ... -
Joint Frame Synchronization and Channel Estimation: Sparse Recovery Approach and USRP Implementation
Ozdemir, Ozgur; Anjinappa, Chethan Kumar; Hamila, Ridha; Al-Dhahir, Naofal; Guvenc, Ismail ( Institute of Electrical and Electronics Engineers Inc. , 2019 , Article)Correlation-based techniques used for frame synchronization can suffer significant performance degradation over multi-path frequency-selective channels. In this paper, we propose a joint frame synchronization and channel ... -
Modelling and compensation of frequency-dependent I/Q imbalance in multiple beamforming OFDM transceivers
Özdemir, Özgür; Hamila, Ridha; Al-Dhahir, Naofal ( IEEE , 2012 , Conference Paper)In this paper, we investigate the effects of asymmetric frequency-dependent joint transmit-receive I/Q imbalance on the performance of multiple beamforming MIMO OFDM systems. We derive the throughput-maximizing TX/RX ... -
Multiple Relay Selection and Beamforming in Dual-Hop Amplify-and-Forward Relay Networks
Gouissem, Ala; Samara, Lutfi; Hamila, Ridha; Al-Dhahir, Naofal; Foufou, Sebti ( Institute of Electrical and Electronics Engineers Inc. , 2019 , Article)In this paper, the problems of multiple relay selection and beamforming optimization are considered for a dual-hop amplify-and-forward relaying network under individual and total power constraints. The selection is performed ... -
On quantized compressed sensing with saturated measurements via convex optimization
Elleuch, Ines; Abdelkefi, Fatma; Siala, Mohamed; Hamila, Ridha; Al-Dhahir, Naofal ( European Signal Processing Conference, EUSIPCO , 2016 , Conference Paper)In this paper, we address the problem of sparse signal recovery, from multi-bit scalar quantized compressed sensing measurements, where the saturation issue is taken into account. We propose a convex optimization approach, ... -
On quantized compressed sensing with saturated measurements via greedy pursuit
Elleuch, Ines; Abdelkefi, Fatma; Siala, Mohamed; Hamila, Ridha; Al-Dhahir, Naofal ( IEEE , 2015 , Conference Paper)We consider the problem of signal recovery under a sparsity prior, from multi-bit quantized compressed measurements. Recently, it has been shown that allowing a small fraction of the quantized measurements to saturate, ... -
On the delay/throughput-security tradeoff in wiretap TDMA networks with buffered nodes
El Shafie, Ahmed; Al-Dhahir, Naofal; Ding, Zhiguo; Hamila, Ridha ( IEEE , 2019 , Article)In this paper, we investigate the tradeoff between security and throughput and between security and queuing delay in wiretap time-division multiple access (TDMA) networks. We derive a simple relationship, characterized by ... -
Quasi-sparsest solutions for quantized compressed sensing by graduated-non-convexity based reweighted ?1minimization
Elleuch, Ines; Abdelkefi, Fatma; Siala, Mohamed; Hamila, Ridha; Al-Dhahir, Naofal ( European Signal Processing Conference, EUSIPCO , 2016 , Conference Paper)In this paper, we address the problem of sparse signal recovery from scalar quantized compressed sensing measurements, via optimization. To compensate for compression losses due to dimensionality reduction and quantization, ... -
Secrecy Performance of Full-Duplex Jamming and Reception under I/Q Imbalance
Samara, Lutfi; Hamila, Ridha; Al-Dhahir, Naofal ( IEEE , 2021 , Article)Investigating the physical layer security performance of full-duplex (FD) radio transceivers has been the subject of numerous research studies. However, self-interference cancellation that enables full exploitation of FD ... -
Secure AF Relaying in Power-Constrained UAV Networks
Samara, Lutfi; AlAbbasi, Abubakr O.; El Shafie, Ahmed; Hamila, Ridha; Al-Dhahir, Naofal ( IEEE , 2021 , Conference Paper)This paper proposes a secure amplify-and-forward (AF) relaying scheme in unmanned aerial vehicle (UAV) networks while accounting for the power consumption limitations of UAVs. Since a UAV's battery life is limited, we ... -
Securing Untrusted RF-EH Relay Networks Using Cooperative Jamming Signals
El Shafie, Ahmed; Mabrouk, Asma; Tourki, Kamel; Al-Dhahir, Naofal; Hamila, Ridha ( Institute of Electrical and Electronics Engineers Inc. , 2017 , Article)We propose a new scheme to secure a wireless-powered untrusted cooperative-communication network, where a legitimate source node (Alice) transmits her information messages to a legitimate destination node (Bob) through the ... -
Security-Enhanced SC-FDMA Transmissions Using Temporal Artificial-Noise and Secret Key Aided Schemes
Marzban, Mohamed F.; El Shafie, Ahmed; Al-Dhahir, Naofal; Hamila, Ridha ( Institute of Electrical and Electronics Engineers Inc. , 2019 , Article)We investigate the physical-layer security of uplink single-carrier frequency-division multiple-access (SC-FDMA) systems. Multiple users, Alices, send confidential messages to a common legitimate base-station, Bob, in the ... -
SINR analysis for beamforming OFDM systems under joint transmit-receive I/Q imbalance
Özdemir, Özgür; Hamila, Ridha; Al-Dhahir, Naofal ( IEEE , 2012 , Conference Paper)In this paper, we derive an analytical expression for the subcarrier average SINR of a beamforming OFDM system in the presence of joint transmit-receive I/Q imbalance. The derived expression quantifies the impact of the ... -
Sparsifying dictionary analysis for FIR MIMO channel-shortening equalizers
Al-Abbasi, Abubakr O.; Hamila, Ridha; Bajwa, Waheed U.; Al-Dhahir, Naofal ( IEEE , 2016 , Conference Paper)In this paper, we propose a general framework that transforms the problems of designing sparse finite-impulse response channel-shortening equalizers and target impulse response filters for multiple antenna systems into the ... -
Sparsity-aware joint frame synchronization and channel estimation: Algorithm and USRP implementation
Özdemir, Özgür; Hamila, Ridha; Al-Dhahir, Naofal; Güvenç, Ismail ( Institute of Electrical and Electronics Engineers Inc. , 2017 , Conference Paper)Conventional correlation-based frame synchronization techniques can suffer significant performance degradation over multi-path frequency-selective channels. As a remedy, in this paper we consider joint frame synchronization ... -
Sparsity-aware Multiple Relay Selection In Large Decode-and-forward Relay Networks
Gouissem, Ala; Hamila, Ridha; Al-dhahir, Naofal; Foufou, Sebti ( Hamad bin Khalifa University Press (HBKU Press) , 2014 , Conference Paper)Cooperative communication is a promising technology that has attracted significant attention recently thanks to its ability to achieve spatial diversity in wireless networks with only single-antenna nodes. The different ... -
Sparsity-Based Joint NBI and impulse noise mitigation in hybrid PLC-Wireless transmissions
Elgenedy, Mahmoud; Awadin, Mohamed Mokhtar; Hamila, Ridha; Bajwa, Waheed U.; Ibrahim, Ahmed S.; Al-Dhahir, Naofal... more authors ... less authors ( IEEE , 2018 , Article)We propose a new sparsity-aware framework to model and mitigate the joint effects of narrow-band interference (NBI) and impulsive noise (IN) in hybrid powerline and unlicensed wireless communication systems. The proposed ... -
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 ... -
Time-Dependent Bit Error Rate Analysis for Smart Utility Networks in the Presence of WLAN Interferers
Gouissem, Ala; Hamila, Ridha; Al-Dhahir, Naofal; Ben-Brahim, Lazhar; Gastli, Adel ( Institute of Electrical and Electronics Engineers Inc. , 2019 , Article)The smart grid (SG) modernizes the aging power grid by using two-way reliable communications dedicated to adaptive energy management. To achieve this goal, smart utility networks (SUNs) are used to efficiently connect the ... -
Wiretap TDMA Networks with Energy-Harvesting Rechargeable-Battery Buffered Sources
El Shafie, Ahmed; Al-dhahir, Naofal; Ding, Zhiguo; Duong, Trung Q.; Hamila, Ridha ( IEEE , 2019 , Article)We investigate the physical-layer security of an uplink wireless time-division multiple-access channel with energy-harvesting source nodes. We consider a set of source nodes equipped with rechargeable batteries and information ...