275 citations · 822 across the 42 of their papers we have counts for
14 papers · 1 filter
DDSAT: Distributed Dynamic Spectrum Access Protocol Implementation Using GNURadio and USRP
Medhat H. M. Elsayed, Amr A. El-Sherif, Amr Mohamed
Frequency spectrum is one of the valuable resources in wireless communications. Using cognitive radio, spectrum efficiency will increase by making use of the spectrum holes. Dynami…
Trading Wireless Information and Power Transfer: Relay Selection to Minimize the Outage Probability
M. Majid Butt, Adnan Nasir, Amr Mohamed +1
This paper studies the outage probability minimization problem for a multiple relay network with energy harvesting constraints. The relays are hybrid nodes used for simultaneous wi…
Secret Key Generation Based on AoA Estimation for Low SNR Conditions
Ahmed Badawy, Tamer Khattab, Tarek Elfouly +3
In the context of physical layer security, a physical layer characteristic is used as a common source of randomness to generate the secret key. Therefore an accurate estimation of…
A Simple AoA Estimation Scheme
Ahmed Badawy, Tamer Khattab, Daniele Trinchero +2
We propose an intuitive, simple and hardware friendly, yet surprisingly novel and efficient, received signal's angle of arrival (AoA) estimation scheme. Our intuitive, two-phases c…
Optimal Spectrum Access for a Rechargeable Cognitive Radio User Based on Energy Buffer State
Ahmed El Shafie, Mahmoud Ashour, Amr Mohamed +1
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 maint…
Secure Degrees of Freedom of the Gaussian MIMO Wiretap and MIMO Broadcast Channels with Unknown Eavesdroppers
Mohamed Amir, Tamer Khattab, Tarek Elfouly +1
We investigate the secure degrees of freedom (SDoF) of the wiretap and the K user Gaussian broadcast channels with multiple antennas at the transmitter, the legitimate receivers an…
On Spectrum Sharing Between Energy Harvesting Cognitive Radio Users and Primary Users
Ahmed El Shafie, Mahmoud Ashour, Tamer Khattab +1
This paper investigates the maximum secondary throughput for a rechargeable secondary user (SU) sharing the spectrum with a primary user (PU) plugged to a reliable power supply. Th…
Power-Optimal Feedback-Based Random Spectrum Access for an Energy Harvesting Cognitive User
Mahmoud Ashour, Ahmed El Shafie, Amr Mohamed +1
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…
Effective Capacity of Cognitive Radio Links: Accessing Primary Feedback Erroneously
M. Majid Butt, Ahmed Anwar, Amr Mohamed +1
We study the performance of a cognitive system modeled by one secondary and one primary link and operating under statistical quality of service (QoS) delay constraints. We analyze…
Energy Efficient Multiuser Scheduling: Statistical Guarantees on Bursty Packet Loss
M. Majid Butt, Eduard A. Jorswieck, Amr Mohamed
In this paper, we consider energy efficient multiuser scheduling. Packet loss tolerance of the applications is exploited to minimize average system energy. There is a constraint on…
Up and Away: A Cheap UAV Cyber-Physical Testbed (Work in Progress)
Ahmed Saeed, Azin Neishaboori, Amr Mohamed +1
Cyber-Physical Systems (CPS) have the promise of presenting the next evolution in computing with potential applications that include aerospace, transportation, robotics, and variou…
Cognitive Radio Networks with Probabilistic Relaying: Stable Throughput and Delay Tradeoffs
Mahmoud Ashour, Amr A. El-Sherif, Tamer ElBatt +1
In this paper, we study and analyze fundamental throughput and delay tradeoffs in cooperative multiple access for cognitive radio systems. We focus on the class of randomized coope…
Interference-Based Optimal Power-Efficient Access Scheme for Cognitive Radio Networks
Ahmed H. Anwar, Ahmed El Shafie, Amr Mohamed +2
In this paper, we propose a new optimization-based access strategy of multipacket reception (MPR) channel for multiple secondary users (SUs) accessing the primary user (PU) spectru…
Optimal Cooperative Cognitive Relaying and Spectrum Access for an Energy Harvesting Cognitive Radio: Reinforcement Learning Approach
Ahmed El Shafie, Tamer Khattab, Hussien Saad +1
In this paper, we consider a cognitive setting under the context of cooperative communications, where the cognitive radio (CR) user is assumed to be a self-organized relay for the…