90 citations · 428 across the 38 of their papers we have counts for
6 papers · 1 filter
Achievable Degrees-of-Freedom of the K-user SISO Interference Channel with Blind Interference Alignment using Staggered Antenna Switching
Ahmed M. Alaa, Mahmoud H. Ismail
In this letter, we present the first characterization for the achievable Degrees-of-Freedom (DoF) by Blind Interference Alignment (BIA) using staggered antenna switching in the …
Opportunistic Beamforming using Dumb Basis Patterns in Multiple Access Cognitive Channels
Ahmed M. Alaa, Mahmoud H. Ismail, Hazim Tawfik
In this paper, we investigate multiuser diversity in interference-limited Multiple Access (MAC) underlay cognitive channels with Line-of-Sight interference (LoS) from the secondary…
Random Aerial Beamforming for Underlay Cognitive Radio with Exposed Secondary Users
Ahmed M. Alaa, Mahmoud H. Ismail, Hazim Tawfik
In this paper, we introduce the exposed secondary users problem in underlay cognitive radio systems, where both the secondary-to-primary and primary-to-secondary channels have a Li…
On the Capacity of the Underwater Acoustic Channel with Dominant Noise Sources
Mustafa A. Kishk, Ahmed M. Alaa
This paper provides an upper-bound for the capacity of the underwater acoustic (UWA) channel with dominant noise sources and generalized fading environments. Previous works have sh…
Opportunistic Spectrum Sharing using Dumb Basis Patterns: The Line-of-Sight Interference Scenario
Ahmed M. Alaa, Mahmoud H. Ismail, Hazim Tawfik
We investigate a spectrum-sharing system with non-severely faded mutual interference links, where both the secondary-to-primary and primary-to-secondary channels have a Line-of-Sig…
Defeating the Eavesdropper: On the Achievable Secrecy Capacity using Reconfigurable Antennas
Ahmed M. Alaa
In this paper, we consider the transmission of confidential messages over slow fading wireless channels in the presence of an eavesdropper. We propose a transmission scheme that em…