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On the Permissible Transmit Power for Secondary User in TV White Spaces
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
2012 (English)In: 2012 7th International Conference on Cognitive Radio Oriented Wireless Networks (CROWNCOM), IEEE , 2012, 13-17 p.Conference paper, Published paper (Refereed)
Abstract [en]

Secondary spectrum access to TV white spaces is considered as a promising solution to relieve the spectrum shortage. In Europe, SE43 working group in CEPT is leading the discussion on the technical requirements for exploiting TV white spaces through the recent ECC report 159. Its analytical approach for determining the maximum permissible power for the secondary user, however, overestimates the power level, and leads to significant violation of the interference limit for TV reception. In this letter, we address the problem by proposing a new approach for determining the secondary user transmit power based on the framework established in ECC report 159. Monte Carlo simulation shows that our method keeps the interference close to the target.

Place, publisher, year, edition, pages
IEEE , 2012. 13-17 p.
Keyword [en]
Terms—TV white space, ECC Report 159, interference protection, transmit power, shadow fading
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-104563DOI: 10.4108/icst.crowncom.2012.248437ISI: 000310377900003Scopus ID: 2-s2.0-84869471031ISBN: 978-1-936968-55-8 (print)OAI: oai:DiVA.org:kth-104563DiVA: diva2:565051
Conference
2012 7th International ICST Conference on Cognitive Radio Oriented Wireless Ntworks and Communications, CROWNCOM 2012; Stockholm;18 June 2012 through 20 June 2012
Projects
QUASAR
Funder
ICT - The Next GenerationWireless@kth
Note

QC 20121106

Available from: 2012-11-06 Created: 2012-11-06 Last updated: 2014-06-10Bibliographically approved
In thesis
1. Availability Assessment for Secondary Access in TV White Space
Open this publication in new window or tab >>Availability Assessment for Secondary Access in TV White Space
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In recent years, the rapid growth in wireless data traffic has posed not only unique opportunities but also great challenges for the wireless industry. In order to meet the growing demand without excessive cost or energy consumption, one feasible option for the operators is to acquire more spectrum for wireless communication. Unlike the lengthy allocation process for exclusive spectrum licenses, secondary spectrum access is deemed as a flexible alternative to obtain additional spectrum at low cost. In particular, the VHF/UHF TV band, so called ’TV White Space’, is considered as the most promising candidate for secondary access thanks to its well defined primary usage and favorable propagation characteristic for building penetration and wide area coverage.

Therefore, secondary access in the TV band has been extensively studied by both academic and industry. Most of the research have focused on the detection of ’spectrum holes’ with sensing technologies, while a few others have provided high level analysis of the potential of TV white space with simplistic secondary interference model for single secondary user. Only A limited number of studies have investigated aggregate interference from multiple secondary users, but even these studies have ignored the adjacent channel interference from secondary users close to the TV receivers.

Thus, in this thesis we first concentrate on examining the effect of harmful interference on TV reception from short range devices transmitting on adjacent channels, and model the accumulative effect of multi-channel interferences observed in the measurement. Then the basic methodology for evaluating the potential of TV white space is developed in the second part of the thesis, where we propose a new analytical approach for regulating the secondary transmit power that significantly outperforms the existing method in the regulatory framework. Finally, we combine the aggregate interference model and the basic regulation methodology to extend the analysis from single user to multiple user case, first with only users transmitting on different adjacent TV channels and later also including users transmitting on co-channels.

Our performance evaluation have shown that the effect of adjacent channel interference at close distance is far from negligible and the accumulative effect of multi-channel interferences has substantial impact on the scalability of a secondary system. In fact, the adjacent channel interference proves to be the primary limiting factor of the TV white space availability for low power short range systems. Nonetheless, because the proposed approach can adapt to varying environmental conditions and consequently utilize the spectrum reuse opportunity more efficiently than existing frameworks, we can still note considerable amount of TV white space available for short range secondary devices.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. vii, 37 p.
Series
Trita-ICT-COS, ISSN 1653-6347 ; 1210
National Category
Telecommunications Communication Systems
Identifiers
urn:nbn:se:kth:diva-104420 (URN)
Presentation
2012-11-09, Sal/Hall C2, Electrum, Isafjordsgatan 26, Kista, 13:00 (English)
Opponent
Supervisors
Projects
QUASAR
Funder
ICT - The Next GenerationEU, FP7, Seventh Framework ProgrammeWireless@kth
Note

QC 20121106

Available from: 2012-11-06 Created: 2012-11-01 Last updated: 2013-11-27Bibliographically approved

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Sung, Ki WonZander, Jens

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