50 citations · 132 across the 22 of their papers we have counts for
11 papers · 1 filter
Secret-Key-Aided Scheme for Securing Untrusted DF Relaying Networks
Ahmed El Shafie, Ahmed Sultan, Asma Mabrouk +2
This paper proposes a new scheme to secure the transmissions in an untrusted decode-and-forward (DF) relaying network. A legitimate source node, Alice, sends her data to a legitima…
Achievable Rates of Buffer-Aided Full-Duplex Gaussian Relay Channels
Ahmed El Shafie, Ahmed Sultan, Ioannis Krikidis +2
We derive closed-form expressions for the achievable rates of a buffer-aided full-duplex (FD) multiple-input multiple-output (MIMO) Gaussian relay channel. The FD relay still suffe…
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…
Distributed Spectrum Sensing with Sequential Ordered Transmissions to a Cognitive Fusion Center
Laila Hesham, Ahmed Sultan, Mohammed Nafie
Cooperative spectrum sensing is a robust strategy that enhances the detection probability of primary licensed users. However, a large number of detectors reporting to a fusion cent…
Cognitive Radio Transmission Strategies for Primary Erasure Channels
Ahmed El-Samadony, Mohammed Nafie, Ahmed Sultan
A fundamental problem in cognitive radio systems is that the cognitive radio is ignorant of the primary channel state and the interference it inflicts on the primary license holder…
Keys through ARQ: Theory and Practice
Yara Abdallah, Mohamed Abdel Latif, Moustafa Youssef +2
This paper develops a novel framework for sharing secret keys using the Automatic Repeat reQuest (ARQ) protocol. We first characterize the underlying information theoretic limits,…
HyberLoc: Providing Physical Layer Location Privacy in Hybrid Sensor Networks
Rania El-Badry, Ahmed Sultan, Moustafa Youssef
In many hybrid wireless sensor networks' applications, sensor nodes are deployed in hostile environments where trusted and un-trusted nodes co-exist. In anchor-based hybrid network…
Power Control for Maximum Throughput in Spectrum Underlay Cognitive Radio Networks
John Tadrous, Ahmed Sultan, Mohammed Nafie +1
We investigate power allocation for users in a spectrum underlay cognitive network. Our objective is to find a power control scheme that allocates transmit power for both primary a…
Power and Transmission Duration Control for Un-Slotted Cognitive Radio Networks
Ahmed Ahmedin, Marwa Ali, Ahmed Sultan +1
We consider an unslotted primary channel with alternating on/off activity and provide a solution to the problem of finding the optimal secondary transmission power and duration giv…
Keys through ARQ
Mohamed Abdel Latif, Ahmed Sultan, Hesham El Gamal
This paper develops a novel framework for sharing secret keys using the well-known Automatic Repeat reQuest (ARQ) protocol. The proposed key sharing protocol does not assume any pr…
ARQ-Based Secret Key Sharing
Mohamed Abdel Ghany, Ahmed Sultan, Hesham El Gamal
This paper develops a novel framework for sharing secret keys using existing Automatic Repeat reQuest (ARQ) protocols. Our approach exploits the multi-path nature of the wireless e…