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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…