102 research outputs found
Primary exclusive region and optimality of the link-level throughput of cognitive terminals
No full textA cognitive network consists of primary nodes, which have priority access to the spectrum, and cognitive (also referred to as secondary) nodes, which access the spectrum provided that the interference they generate in the primary system remains limited. In practice, it means that the cognitive terminals must remain outside of a region surrounding the primary receiver: the primary exclusive region. The focus of this paper is on the definition of this region and the analysis of the achievable throughput of cognitive terminals under the constraints imposed by the primary network. More precisely, we establish the fundamental limits of the terminal probability of transmission and under what conditions this throughput can still be optimal (in a network throughput sense) for the secondary network.info:eu-repo/semantics/publishe
Dynamic spectrum access: from the concept to the implementation
No full textSCOPUS: ed.jinfo:eu-repo/semantics/publishe
Primary exclusive region and throughput of cognitive dual-polarized networks
No full textDiversity techniques are of importance in the context of cognitive radio networks since they enable the primary and secondary terminals to simultaneously and efficiently share the spectral resources in the same location. In this paper, we investigate a simple, yet powerful, diversity scheme based on the exploitation of the polarimetric dimension. More precisely, we consider a scenario where the cognitive terminals use cross- polarized communications with respect to the primary users. Our approach is network-centric, i.e. the performance of the proposed dual- polarized system is investigated in terms of link throughput in the primary and the secondary networks. Our results suggest that the polarimetric dimension represents a remarkable (and simple to implement) opportunity in the context of cognitive radio networks.info:eu-repo/semantics/publishe
Polarization orthogonality for the co-existence of wideband fading cognitive networks
No full textOrthogonality techniques for cognitive radio networks are important since they enable the primary and secondary terminals to efficiently share the spectral resources in the same location simultaneously. In this paper, we investigate a simple, yet powerful, orthogonality scheme by exploiting the polarimetric dimension. More precisely, we evaluate a scenario where the cognitive terminals use cross-polarized communications in a communication channel subject to wideband (or narrowband) Rayleigh fading. A primary exclusive region in which cognitive terminals are not allowed to transmit is defined and its radius is computed. Finally, the overall performance of the proposed solution is evaluated in terms of network throughput.info:eu-repo/semantics/publishe
Link-level performance of indoor body area networks with centralized topologies
No full textsensors networks and, more specifically, body area networks (BANs) are key building blocks of the future generation networks and the Internet of Things as well. In the last years, research has focused on channel modeling and on the design of efficient medium access control (MAC) mechanisms. Less attention has been paid to network-level performance analysis. Thereby, this paper presents a novel analytical framework for network performance analysis with star (i.e. centralized) topologies. This framework takes into account realistic channel statistics and provides several insights on BAN design and analysis. © Dricot et al.SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Outage, local throughput, and achievable transmission rate of narrowband body area networks
No full textPersonal area networks and, more specifically, body area networks (BANs) are key building blocks of the future generation networks and the Internet of Things as well. In the last years, research has focused on the channel modeling and the definition of efficient medium access control (MAC) mechanisms. Less attention was paid to network-level performance. Thereby, this paper presents a novel analytical model for network performance analysis with centralized and mesh topologies. This model takes into account the channel statistics (i.e., the large-scale fading) and delivers several insights on the BAN implementation
On the link layer performance of narrowband body area networks
No full textinfo:eu-repo/semantics/publishe
Probabilistic co-existence and throughput of cognitive dual-polarized networks
No full textDiversity techniques for cognitive radio networks are important since they enable the primary and secondary terminals to efficiently share the spectral resources in the same location simultaneously. In this paper, we investigate a simple, yet powerful, diversity scheme by exploiting the polarimetric dimension. More precisely, we evaluate a scenario where the cognitive terminals use cross-polarized communications with respect to the primary users. Our approach is network-centric, i.e. performance of the proposed dual-polarized system is investigated in terms of link throughput in the primary and the secondary networks. In order to carry out this analysis, we impose a probabilistic co-existence constraint derived from an information-theoretic approach, i.e. we enforce a guaranteed capacity for a primary terminal for a high fraction of time. Improvements brought about by the use of our scheme are demonstrated analytically and through simulations. In particular, the main simulation parameters are extracted from a measurement campaign dedicated to characterization of indoor-to-indoor and outdoor-to-indoor polarization behaviors. Our results suggest that the polarimetric dimension represents a remarkable opportunity, yet easily implementable, in the context of cognitive radio networks.SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Doppler Radar with In-Band Full Duplex Radios
No full textsponsorship: This work was funded by the European Union's Horizon 2020 under grant agreement no. 732174 (ORCA project). We would also like to thank Professor F. Horlin, University of Brussels (ULB), for his helpful comments. (European Union|732174)status: Publishe
Impact of the environment and the topology on the performance of hierarchical body area networks
No full textPersonal area networks and, more specifically, body area networks (BANs) are key building blocks of future generation networks and of the Internet of Things as well. In this article, we present a novel analytical framework for network performance analysis of body sensor networks with hierarchical (tree) topologies. This framework takes into account the specificities of the on-body channel modeling and the impact of the surrounding environment. The obtained results clearly highlight the differences between indoor and outdoor scenarios, and provide several insights on BAN design and analysis. In particular, it will be shown that the BAN topology should be selected according to the foreseen medical application and the deployment environment.SCOPUS: ar.jinfo:eu-repo/semantics/publishe
- …
