50 citations · 132 across the 22 of their papers we have counts for
4 papers · 1 filter
Cognitive Radio Transmission Strategies for Primary Markovian Channels
Ahmed ElSamadouny, Mohammed Nafie, Ahmed Sultan
A fundamental problem in cognitive radio systems is that the cognitive radio is ignorant of the primary channel state and, hence, of the amount of actual harm it inflicts on the pr…
Optimal Random Access and Random Spectrum Sensing for an Energy Harvesting Cognitive Radio
Ahmed El Shafie, Ahmed Sultan
We consider a secondary user with energy harvesting capability. We design access schemes for the secondary user which incorporate random spectrum sensing and random access, and whi…
Cooperative Cognitive Relaying with Ordered Cognitive Multiple Access
Ahmed El Shafie, Ahmed Sultan
We investigate a cognitive radio system with two secondary users who can cooperate with the primary user in relaying its packets to the primary receiver. In addition to its own que…
A Soft Sensing-Based Cognitive Access Scheme Exploiting Primary Feedback
Ahmed M. Arafa, Karim G. Seddik, Ahmed K. Sultan +2
In this paper, we examine a cognitive spectrum access scheme in which secondary users exploit the primary feedback information. We consider an overlay secondary network employing a…