600 citations · 1.8k across the 128 of their papers we have counts for
11 papers · 1 filter
Performance and Compensation of I/Q Imbalance in Differential STBC-OFDM
Lei Chen, Ahmed G. Helmy, Guangrong Yue +2
Differential space time block coding (STBC) achieves full spatial diversity and avoids channel estimation overhead. Over highly frequency-selective channels, STBC is integrated wit…
Performance Analysis and Compensation of Joint TX/RX I/Q Imbalance in Differential STBC-OFDM
Lei Chen, Ahmed G. Helmy, Guangrong Yue +2
Differential space time block coding (STBC) achieves full spatial diversity and avoids channel estimation overhead. Over highly frequency-selective channels, STBC is integrated wit…
Cooperative Access Schemes for Efficient SWIPT Transmissions in Cognitive Radio Networks
Ahmed El Shafie, Naofal Al-Dhahir, Ridha Hamila
We investigate joint information and energy cooperative schemes in a slotted-time cognitive radio network with a primary transmitter-receiver pair and a set of secondary transmitte…
A Secure Multiple-Access Scheme for Rechargeable Wireless Sensors in the Presence of an Eavesdropper
Ahmed El Shafie, Naofal Al-Dhahir
We propose a simple yet efficient scheme for a set of energy-harvesting sensors to establish secure communication with a common destination (a master node). An eavesdropper attempt…
An Artificial-Noise-Aided Hybrid TS/PS Scheme for OFDM-Based SWIPT Systems
Ahmed El Shafie, Kamel Tourki, Naofal Al-Dhahir
We propose a new artificial-noise aided hybrid time-switching/power-splitting scheme for orthogonal frequency-division multiplexing (OFDM) systems to securely transmit data and tra…
Secure Communications in the Presence of a Buffer-Aided Wireless-Powered Relay With Self-Energy Recycling
Ahmed El Shafie, Naofal Al-Dhahir
We consider a relay-assisted wireless network, where the energy-harvesting buffer-aided relay node is powered by radio-frequency signals from a source node wishing to communicate w…