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Impact of aggregate interference on meteorological radar from secondary users
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. National University of Engineering (UNI), Nicaragua. (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: IEEE Wireless Communications and Networking Conference (WCNC), IEEE , 2011, 2167-2172 p.Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we investigate the impact of aggregate interference in a secondary spectrum access system. Particularly, meteorological radar operating in 5.6 GHz band is considered to be a primary user. Secondary users are WLAN devices spreading in a large area which induce aggregate interference to the radar. We develop a mathematical model to derive the robability distribution function (PDF) of the aggregate interference. The derivation considers dynamic frequency selection (DFS) mechanism for the protection of the radar such that the transmission of each WLAN is regulated by an interference threshold. Numerical experiments are performed with various propagation environments and densities of WLAN devices. It is observed that the effect of aggregate interference is severe in a rural environment. The interference threshold for individual WLAN should be much lower than the maximum tolerable interference at the radar. Thus, only a limited number of WLANs can transmit at the same time. On the other hand, adverse effect of the aggregate interference is not shown in an urban environment, where up to 10 WLANs per square kilometer can use the radar spectrum without considering the aggregate interference. The framework discussed in this paper can readily be adapted to assess the aggregate interference for other types of radars.

Place, publisher, year, edition, pages
IEEE , 2011. 2167-2172 p.
Keyword [en]
aggregate interference, secondary spectrum access, meteorological radar
National Category
Telecommunications Information Science
Identifiers
URN: urn:nbn:se:kth:diva-34000DOI: 10.1109/WCNC.2011.5779468ISI: 000297160200371Scopus ID: 2-s2.0-79959322057ISBN: 978-1-61284-255-4 (print)OAI: oai:DiVA.org:kth-34000DiVA: diva2:418466
Conference
IEEE Wireless Communications and Networking Conference (WCNC)
Projects
QUASAR
Funder
EU, FP7, Seventh Framework Programme, 248303Wireless@kth
Note

QC 20130403

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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