24 citations · 36 across the 6 of their papers we have counts for
6 papers · 1 filter
On Power Control and Frequency Reuse in the Two User Cognitive Channel
Onur Ozan Koyluoglu, Hesham El Gamal
This paper considers the generalized cognitive radio channel where the secondary user is allowed to reuse the frequency during both the idle and active periods of the primary user,…
ARQ-Based Secret Key Sharing
Mohamed Abdel Ghany, Ahmed Sultan, Hesham El Gamal
This paper develops a novel framework for sharing secret keys using existing Automatic Repeat reQuest (ARQ) protocols. Our approach exploits the multi-path nature of the wireless e…
Optimal Medium Access Protocols for Cognitive Radio Networks
Lifeng Lai, Hesham El Gamal, Hai Jiang +1
This paper focuses on the design of medium access control protocols for cognitive radio networks. The scenario in which a single cognitive user wishes to opportunistically exploit…
Cognitive Medium Access: Exploration, Exploitation and Competition
Lifeng Lai, Hesham El Gamal, Hai Jiang +1
This paper establishes the equivalence between cognitive medium access and the competitive multi-armed bandit problem. First, the scenario in which a single cognitive user wishes t…
Secrecy Capacity of the Wiretap Channel with Noisy Feedback
Lifeng Lai, Hesham El Gamal, H. Vincent Poor
In this work, the role of noisy feedback in enhancing the secrecy capacity of the wiretap channel is investigated. A model is considered in which the feed-forward and feedback sign…
The Relay-Eavesdropper Channel: Cooperation for Secrecy
Lifeng Lai, Hesham El Gamal
This paper establishes the utility of user cooperation in facilitating secure wireless communications. In particular, the four-terminal relay-eavesdropper channel is introduced and…