Topic
Cognitive network
About: Cognitive network is a research topic. Over the lifetime, 4213 publications have been published within this topic receiving 107093 citations.
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25 Feb 2009TL;DR: In this article, a dynamic cellular cognitive system (DCCS) is proposed to enable high quality communications among a diverse set of cognitive radio nodes while minimizing interference to primary and other secondary users by employing Dynamic Spectrum Access (DSA) in a DCCS.
Abstract: High quality communications among a diverse set of cognitive radio (CR) nodes is permitted while minimizing interference to primary and other secondary users by employing Dynamic Spectrum Access (DSA) in a Dynamic Cellular Cognitive System (DCCS). Diverse device types interoperate, cooperate, and communicate with high spectrum efficiency and do not require infrastructure to form the network. The dynamic cellular cognitive system can expand to a wider geographical distribution via linking to existing infrastructure.
35 citations
TL;DR: A flexible structure is proposed which enables the attacker to reconfigure the attack parameters based on the defense strategy employed at the fusion center (FC) adaptively, and it is demonstrated that the proposed attack method leads to a convex linear programming problem.
35 citations
TL;DR: The 17 papers in this special issue focus on the theory and applications of cognitive radio and their applications in the rapidly changing environment.
Abstract: The 17 papers in this special issue focus on the theory and applications of cognitive radio.
35 citations
06 Apr 2009
TL;DR: An open cognitive radio network testbed provides the infrastructure for researchers at Virginia Tech and partner institutions to evaluate independently developed cognitive radio engines, sensing techniques, applications, protocols, performance metrics, and algorithms in a real world wireless environment, in contrast to a computer simulation or single node-to-single node environment.
Abstract: The Wireless @ VT research group has embarked on a effort to develop a unique testbed named the Virginia Tech Cognitive Radio Network (VT-CORNET), for the development, testing, and evaluation of cognitive engine techniques and cognitive radio network applications. An open cognitive radio network testbed provides the infrastructure for researchers at Virginia Tech and partner institutions to evaluate independently developed cognitive radio engines, sensing techniques, applications, protocols, performance metrics, and algorithms in a real world wireless environment, in contrast to a computer simulation or single node-to-single node environment.
35 citations
30 Mar 2009
TL;DR: In this paper Continuous-time Markov chains are used to model the spectrum access and it is shown that channel utilization is higher than random access and reservation based access.
Abstract: Cognitive radio networks deal with opportunistic spectrum access leading to greater utilization of the spectrum. The extent of utilization depends on the primary user's traffic and also on the way the spectrum is accessed by the primary and secondary users. In this paper Continuous-time Markov chains are used to model the spectrum access. The proposed three-dimensional model represents a more accurate cognitive system than the existing models with increased spectrum utilization and than the random and reservation based spectrum access. A non-random access method is proposed to remove the forced termination states. In addition, call dropping and blocking probabilities are reduced. It is further shown that channel utilization is higher than random access and reservation based access.
34 citations