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Aggregate Interference from Secondary Users with Heterogeneous Density
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.
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: 2011 IEEE 22nd International Symposium On Personal Indoor And Mobile Radio Communications (PIMRC), IEEE , 2011, 428-432 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents an analytical model to approximate the probability distribution function of the aggregate interference that a primary user receives from multiple secondary transmitters. In particular, we consider heterogeneity in spatial distribution of secondary users such that there are several sites with densely populated secondary users in the whole area. The concentration of secondary users is modeled as an annulus sector with higher user density, which is termed hot zone. The mathematical framework presented in this paper can readily be adapted to various existing interference models. It is observed that the heterogenous user distribution has a considerable impact on the aggregate interference if the hot zone is near the primary receiver, while hot zones over a certain distance is well approximated by a homogeneous secondary user distribution. The aggregate interference also depends on the shape of the hot zone and the interference threshold imposed on the secondary users.

Place, publisher, year, edition, pages
IEEE , 2011. 428-432 p.
Keyword [en]
aggregate interference, secondary spectrum access, heterogeneous density, hot zone model
National Category
Telecommunications Information Science
Identifiers
URN: urn:nbn:se:kth:diva-34004DOI: 10.1109/PIMRC.2011.6139997ISI: 000300719700083Scopus ID: 2-s2.0-84857599763ISBN: 978-1-4577-1348-4 (print)OAI: oai:DiVA.org:kth-34004DiVA: diva2:418474
Conference
22nd IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) Location: Toronto, Canada, Date: SEP 11-14, 2011
Projects
QUASAR
Funder
EU, FP7, Seventh Framework Programme, 248303Wireless@kth
Note

QC 20120410

Available from: 2011-05-23 Created: 2011-05-23 Last updated: 2016-04-27Bibliographically 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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