Results 1 - 10 of 2,668

Clusterbased spectrum sensing architecture for opportunistic spectrum access networks

by Przemysław Pawełczak, Cheng Guo, R. Venkatesha Prasad, Ramin Hekmat - IEEE Vehicular Technology Conference VTC2007 , 2006
"... Abstract — In opportunistic spectrum access networks (OSAN) procedures for spectrum sensing have to be designed in such a way that the probability of miss-detection and false alarm, should not exceed a certain level, while detecting the presence of the licensed user (LU) of a radio channel. One of t ..."
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Abstract — In opportunistic spectrum access networks (OSAN) procedures for spectrum sensing have to be designed in such a way that the probability of miss-detection and false alarm, should not exceed a certain level, while detecting the presence of the licensed user (LU) of a radio channel. One

Low Overhead Dynamic Spectrum Reallocation in Opportunistic Spectrum Access Networks

by Yu Tian, Wenzhong Li, Zhuo Li, Sanglu Lu, Xiaoming Fu
"... Abstract — Opportunistic spectrum access, which allows sec-ondary users opportunistically access unused licensed channels to exploit instantaneous spectrum availability, is a promising approach to achieve efficient spectrum utilization and mitigate spectrum scarcity. To address the challenge of dyna ..."
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Abstract — Opportunistic spectrum access, which allows sec-ondary users opportunistically access unused licensed channels to exploit instantaneous spectrum availability, is a promising approach to achieve efficient spectrum utilization and mitigate spectrum scarcity. To address the challenge

Truthful Least-Priced-Path Routing in Opportunistic Spectrum Access Networks

by Tao Shu, Marwan Krunz , 2009
"... We study the problem of finding the least-priced path (LPP) between a source and a destination in opportunistic spectrum access (OSA) networks. This problem is motivated by economic considerations, whereby spectrum opportunities are sold/leased to secondary radios (SRs). This incurs a cost for the c ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
We study the problem of finding the least-priced path (LPP) between a source and a destination in opportunistic spectrum access (OSA) networks. This problem is motivated by economic considerations, whereby spectrum opportunities are sold/leased to secondary radios (SRs). This incurs a cost

Distributed Opportunistic Spectrum Access Networks: From Theory to Practice

by Ahmed Khattab, Dmitri Perkins, Magdy A. Bayoumi
"... Abstract—Opportunistic Spectrum Access (OSA) is foreseen as the future of wireless communications. OSA relies on the cognitive radio transceiver that tracks the spectral opportunities over a wide spectrum range (multiple GHz). The cognitive radio should be able to analyze the huge amount of acquired ..."
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Abstract—Opportunistic Spectrum Access (OSA) is foreseen as the future of wireless communications. OSA relies on the cognitive radio transceiver that tracks the spectral opportunities over a wide spectrum range (multiple GHz). The cognitive radio should be able to analyze the huge amount

1 When Channel Bonding is Beneficial for Opportunistic Spectrum Access Networks

by Shaunak Joshi, Przemysław Pawełczak, John Villasenor
"... ar ..."
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Impact of Control Channel Design on Cooperative Spectrum Sensing in Opportunistic Spectrum Access Networks

by Marco Petracca, Franco Mazzenga, Remo Pomposini, Francesco Vatalaro
"... Abstract—In Opportunistic Spectrum Access (OSA) networks, Secondary unlicensed Users (SUs) need a common Control Channel (CC) to identify the spectrum opportunities, i.e., com-mon spectrum holes unused by licensed Primary Users (PUs). Typically, an interference-free CC is unrealistically assumed in ..."
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Abstract—In Opportunistic Spectrum Access (OSA) networks, Secondary unlicensed Users (SUs) need a common Control Channel (CC) to identify the spectrum opportunities, i.e., com-mon spectrum holes unused by licensed Primary Users (PUs). Typically, an interference-free CC is unrealistically assumed

NeXt generation/dynamic spectrum access/cognitive Radio Wireless Networks: A Survey

by Ian F. Akyildiz, Won-Yeol Lee, Mehmet C. Vuran, Shantidev Mohanty - COMPUTER NETWORKS JOURNAL (ELSEVIER , 2006
"... Today's wireless networks are characterized by a fixed spectrum assignment policy. However, a large portion of the assigned spectrum is used sporadically and geographical variations in the utilization of assigned spectrum ranges from 15% to 85% with a high variance in time. The limited availabl ..."
Abstract - Cited by 746 (15 self) - Add to MetaCart
available spectrum and the ine#ciency in the spectrum usage necessitate a new communication paradigm to exploit the existing wireless spectrum opportunistically. This new networking paradigm is referred to as NeXt Generation (xG) Networks as well as Dynamic Spectrum Access (DSA) and cognitive radio networks

The University of Florida sparse matrix collection

by Timothy A. Davis - NA DIGEST , 1997
"... The University of Florida Sparse Matrix Collection is a large, widely available, and actively growing set of sparse matrices that arise in real applications. Its matrices cover a wide spectrum of problem domains, both those arising from problems with underlying 2D or 3D geometry (structural enginee ..."
Abstract - Cited by 536 (17 self) - Add to MetaCart
The University of Florida Sparse Matrix Collection is a large, widely available, and actively growing set of sparse matrices that arise in real applications. Its matrices cover a wide spectrum of problem domains, both those arising from problems with underlying 2D or 3D geometry (structural

Opportunistic Media Access for Multirate Ad Hoc Networks

by B. Sadeghi, V. Kanodia, A. Sabharwal, E. Knightly , 2002
"... The IEEE 802.11 wireless media access standard supports multiple data rates at the physical layer. Moreover, various auto rate adaptation mechanisms at the medium access layer have been proposed to utilize this multi-rate capability by automatically adapting the transmission rate to best match the c ..."
Abstract - Cited by 332 (12 self) - Add to MetaCart
The IEEE 802.11 wireless media access standard supports multiple data rates at the physical layer. Moreover, various auto rate adaptation mechanisms at the medium access layer have been proposed to utilize this multi-rate capability by automatically adapting the transmission rate to best match

Cooperation and Learning in Multiuser Opportunistic Spectrum Access

by Hua Liu, Bhaskar Krishnamachari, Qing Zhao
"... Abstract — We consider how two secondary users should interact to maximize their total throughput in a twochannel sensing-based opportunistic spectrum access network where spectrum opportunities are time varying and spatially inhomogeneous. By modeling the occupancy of the primary users as discrete- ..."
Abstract - Cited by 15 (2 self) - Add to MetaCart
Abstract — We consider how two secondary users should interact to maximize their total throughput in a twochannel sensing-based opportunistic spectrum access network where spectrum opportunities are time varying and spatially inhomogeneous. By modeling the occupancy of the primary users as discrete
Results 1 - 10 of 2,668