28 citations · 76 across the 48 of their papers we have counts for
13 papers · 2 filters
Multi-User Diversity with Optimal Power Allocation in Spectrum Sharing under Average Interference Power Constraint
Fotis Foukalas, Tamer Khattab
In this paper, we investigate the performance of multi-user diversity (MUD) with optimal power allocation (OPA) in spectrum sharing (SS) under average interference power (AIP) cons…
Interference Cancellation trough Interference Alignment for Downlink of Cognitive Cellular Networks
May Moussa, Fotis Foukalas, Tamer Khattab
In this letter, we propose the interference cancellation through interference alignment at the downlink of cognitive cellular networks. Interference alignment helps the spatial res…
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…
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 the Degrees of Freedom of SISO X-Channel with Alternating CSIT
Ahmed Wagdy, Amr El-Keyi, Tamer Khattab +1
In this paper, we establish the degrees of freedom (DoF) of the two-user single input single output (SISO) X-channel with alternating channel state information at the transmitters…
The asymmetric DoF Region for the 3-user MxN Interference Channel
Mohamed Khalil, Tamer Khattab, Amr El-Keyi +1
In this paper, the 3-user Gaussian MIMO interference channel is considered. The asymmetric distribution of the DoF, where different users have different number of DoF, is studied.…
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…
On Orthogonal Band Allocation for Multi-User Multi-Band Cognitive Radio Networks: Stability Analysis
Ahmed El Shafie, Tamer Khattab
In this work, we study the problem of band allocation of buffered secondary users (SUs) to primary bands licensed to (owned by) buffered primary users (PUs). The…
A DoF-Optimal Scheme for the two-user X-channel with Synergistic Alternating CSIT
Ahmed Wagdy, Amr El-Keyi, Tamer Khattab +1
In this paper, the degrees of freedom (DoF) of the two-user single input single output (SISO) X-channel are investigated. Three cases are considered for the availability of channel…
Maximum Throughput of a Cooperative Energy Harvesting Cognitive Radio User
Ahmed El Shafie, Tamer Khattab, H. Vincent Poor
In this paper, we investigate the maximum throughput of a saturated rechargeable secondary user (SU) sharing the spectrum with a primary user (PU). The SU harvests energy packets (…
On the Design of Relay--Assisted Primary--Secondary Networks
Ahmed El Shafie, Tamer Khattab, Ahmed Sultan +1
The use of cognitive relays to assist primary and secondary transmissions in a time-slotted cognitive setting with one primary user (PU) and one secondary user (SU) is investig…
Maximum Throughput for a Cognitive Radio Multi-Antenna User with Multiple Primary Users
Ahmed El Shafie, Tamer Khattab
We investigate a cognitive radio scenario involving a single cognitive transmitter equipped with antennas sharing the spectrum with primary users (PUs)…