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Temporal secondary access opportuities for WLAN in radar bands
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth. (Communicatio System Lab)
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.ORCID iD: 0000-0001-7642-3067
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.ORCID iD: 0000-0003-4986-6123
2011 (English)In: Wireless Personal Multimedia Communications (WPMC), 2011 14th International Symposium on, Elsevier, 2011, 6081515- p.Conference paper, Published paper (Refereed)
Abstract [en]

In this paper we quantify the temporal opportunities for secondary access in radar bands. In our study, WLANs are secondary users homogeneously or heterogeneously distributed, which opportunistically access the radar spectrum. Each WLAN employs dynamic frequency  selection (DFS) as a mechanism to protect the radar from interference. We also consider an interference protection mechanism based on DFS and the prediction of the radar’s antenna pattern, which is termed Temporal DFS. We have the most of the time the probability of accessing the radar band are higher when Temporal DFS is used. As a consequence, there are more active WLANs when Temporal DFS mechanism is considered compare with normal DFS mechanism. This, shows once more that by having knowledge of the primary users activity secondary users can increase the probability of accessing the spectrum and improve spectrum utilization.

Place, publisher, year, edition, pages
Elsevier, 2011. 6081515- p.
Keyword [en]
aggregate interference, secondary spectrum access, temporal opportunity
National Category
Telecommunications Information Science
Identifiers
URN: urn:nbn:se:kth:diva-34006Scopus ID: 2-s2.0-83655183406ISBN: 978-2-908849-26-4 (print)ISBN: 978-1-4577-1786-4 (print)OAI: oai:DiVA.org:kth-34006DiVA: diva2:418482
Conference
2011 14th International Symposium on Wireless Personal Multimedia Communications: Communications, Networking and Applications for the Internet of Things, WPMC'11; Brest; France; 3-7 October 2011
Projects
QUASAR
Funder
EU, FP7, Seventh Framework Programme, 248303Wireless@kth
Note

QC 20140912. QC 20160128

Available from: 2011-05-23 Created: 2011-05-23 Last updated: 2016-01-28Bibliographically approved
In thesis
1. Topics in Dynamic Spectrum Access: Market Based Spectrum Sharing and Secondary User Access in Radar Bands
Open this publication in new window or tab >>Topics in Dynamic Spectrum Access: Market Based Spectrum Sharing and Secondary User Access in Radar Bands
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The steady growth in demand for spectrum has increased research interest in dynamic spectrum access schemes. This thesis studies some challenges in dynamic spectrum access based on two strategies: open sharing and hierarchical access. (1) In the open sharing model, the channels are allocated based on an auction process, taking into account the propagation characteristics of the channels, termed as channel heterogeneity. Two distributed dynamic spectrum access schemes are evaluated, sequential and concurrent. We show that the concurrent accessmechanismperforms better in terms of channel utilization and energy consumption, especially in wireless cellular network with an energy constraint. (2) In the hierarchical model, we assess the opportunities for secondary access in the radar band at 5.6GHz. The primary user is a meteorological radar and WLANs are the secondary users. The secondary users implement an interference protection mechanism to protect the radar, such that the WLAN’s transmission is regulated by an interference threshold. We evaluate the aggregate interference caused to the radar from multiple WLANs transmitting. We derive a mathematicalmodel to approximate the probability distribution function of the aggregate interference at the primary user, considering two cases: when secondary users are homogeneously distributed, and when they are heterogeneously distributed. The heterogeneous distribution of secondary users is modeled using an annulus sector with a higher density, called a hot zone. Finally, we evaluate opportunities for secondary access when WLANs employ an interference protection mechanism that considers the radar’s antenna pattern, such that temporal opportunities for transmission exist. The analytical probability distribution function of the interference is verified showing a good agrement with a Monte Carlo simulation. We show that the aggregate interference is sensitive to the propagation environment, thus in the rural case interference is more severe when compared to the urban case. In the evaluation of the hot zonemodel, we observe that the heterogenous distribution of secondary users has impact on the aggregate interference if the hot zone is near to the radar. The mathematical framework presented in this thesis can easily be adapted to assess interference to other types of primary and secondary users.

 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. xi, 42 p.
Series
Trita-ICT-COS, ISSN 1653-6347 ; 1105
Keyword
spectrum sharing, radar band, cognitive radio
National Category
Telecommunications Information Science
Identifiers
urn:nbn:se:kth:diva-33791 (URN)
Presentation
2011-06-15, C2-Electrum 1, Isafjordsgatan 26, Kista, 14:00 (English)
Opponent
Supervisors
Note
QC 20110523Available from: 2011-05-23 Created: 2011-05-17 Last updated: 2011-05-23Bibliographically approved

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Sung, Ki WonZander, Jens

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