1 citations · 1 across the 5 of their papers we have counts for
5 papers
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…
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…
Spectrum Sensing Via Reconfigurable Antennas: Fundamental Limits and Potential Gains
Ahmed M. Alaa, Mahmoud H. Ismail, Hazim Tawfik
We propose a novel paradigm for spectrum sensing in cognitive radio networks that provides diversity and capacity benefits using a single antenna at the Secondary User (SU) receive…
Spectrum Sensing Via Reconfigurable Antennas: Is Cooperation of Secondary Users Indispensable?
Ahmed M. Alaa, Mahmoud H. Ismail, Hazim Tawfik
This work presents an analytical framework for characterizing the performance of cooperative and noncooperative spectrum sensing schemes by figuring out the tradeoff between the ac…