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Short Range White Space Utilization in Broadcast Systems for Indoor Environments
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: 0000-0003-4986-6123
2010 (English)In: IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks (DySPAN), IEEE , 2010Conference paper, Published paper (Refereed)
Abstract [en]

As Digital Television Broadcasting spreads over theworld, existing (and more) TV channels can be distributed in lessspectrum in the spectrum traditionally allocated to TVbroadcasting. This freed spectrum is also referred to as the "DigitalDividend" and its use has been debated around the world. Inaddition, there is also a debate about the potential use of the “whitespace” within the TV-bands. This is due to the sparse frequencyplanning with large interference margins, which is typical in widearea broadcasting. Various technical approaches using Opportunistic Spectrum Access(OSA) have been proposed for unlicensed “white space” access tothe TV bands. Most of previous studies have focused on spectrumsensing, i.e. detecting “free channels”, where secondary users,utilizing White Space Devices (WSD) could avoid causing harmfulinterference to the TV receivers. However, interference caused byWSD is not only limited to co-channel interference. In particular, inshort-range scenarios, the adjacent channel interference is anequally severe problem. Assessing the feasibility of WSDs in shortrangeindoor scenarios, taking more interference mechanisms intoaccount is the objective of this paper. An Indoor home scenariowith Cable, Rooftop antenna and Set-top antenna reception ofDVB-T, has been analyzed. The spectrum reuse opportunities forWSDs have been determined, using the number of channels whereit is possible to transmit without causing harmful interference toDVB-T receivers as performance measure. Simulation results showthat the number of available channels for indoor unlicensed whitespace transmission appears to be significant in most of the studiedscenarios.

Place, publisher, year, edition, pages
IEEE , 2010.
Keyword [en]
White space, Digital Television Broadcasting, White Space Devices, Opportunistic Spectrum Access
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-62724DOI: 10.1109/DYSPAN.2010.5457866Scopus ID: 2-s2.0-77953228395OAI: oai:DiVA.org:kth-62724DiVA: diva2:480998
Conference
Symposium on New Frontiers in Dynamic Spectrum, 2010 IEEE
Note
QC 20120202Available from: 2012-02-02 Created: 2012-01-20 Last updated: 2014-05-19Bibliographically approved
In thesis
1. Low-Power Secondary Access to the TV and Aeronautical Bands
Open this publication in new window or tab >>Low-Power Secondary Access to the TV and Aeronautical Bands
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The avalanche in mobile data consumption represents a big challenge for mobile operators. The efficient use of radio resources, e.g. technology, infrastructure and spectrum, is needed to meet the new capacity requirement in the mobile networks. This thesis aims at quantifying the real-life spectrum opportunities for deploying a massive low-power indoor secondary system. Our studies have mainly focused in two frequency bands: the digital TV and the aeronautical band. Indoor secondary access to these bands presents different technical challenges: Limited adjacent channel rejection capabilities and no information about the location of the primary receivers are key challenges in the digital TV band. Instead for the aeronautical band, the control of the aggregate interference over a large area due to the high sensitivity levels and the extremely low permissible outage probability at the primary system are the key issues for secondary access.

We have proposed a research methodology for determining the availability of spectrum opportunities in both frequency bands: digital TV and aeronautical band. Our methodology mainly emphasizes on establishing the realistic limits of tolerable interference at the primary, devising practical sharing schemes and determining the operational conditions and constraints for the secondary system. Based on our numerical results and measurement campaigns, we conclude that there is significant amount of spectrum opportunities for the deployment of massive low-power indoor secondary access in the digital TV and aeronautical band. The availability of spectrum opportunities highly depends on the sharing mechanisms, the primary protection criteria and the secondary system parameters. Future work should consider how the secondary users share the available spectrum in order to optimize the performance of secondary system in realistic scenarios. Another interesting investigation is the business viability assessment of secondary access in both frequency bands.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. viii, 42 p.
Series
Trita-ICT-COS, ISSN 1653-6347 ; 12:09
Keyword
Secondary Access, Interference Management, TV band, Aeronautical Band
National Category
Communication Systems
Research subject
SRA - ICT
Identifiers
urn:nbn:se:kth:diva-103045 (URN)
Presentation
2012-10-12, C2 - Electrum 1, Isafjordsgatan 26, Kista, 15:00 (English)
Opponent
Supervisors
Funder
ICT - The Next Generation
Note

QC 20121002

Available from: 2012-10-02 Created: 2012-10-01 Last updated: 2013-04-15Bibliographically approved
2. On the Deployment of Large-Scale High-Capacity Wireless Systems with Secondary Spectrum Access
Open this publication in new window or tab >>On the Deployment of Large-Scale High-Capacity Wireless Systems with Secondary Spectrum Access
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The avalanche in mobile data consumption represents a big challenge for mobile networks operators and national regulators. This thesis focuses on finding additional spectrum to meet this demand in a cost-efficient way by considering shared spectrum access. Our studies aim at identifying key factors in achieving large-scale business success,quantifying the spectrum availability and identifying suitable regulatory/sharing polices for large-scale secondary access in the aeronautical and radar bands. This thesis proposes a research methodology, that considers business, technical and regulatory aspects involved in assessing commercial viability of large-scale deployment of wireless networks, employing vertical spectrum sharing in the aeronautical and radar bands. We pinpoint the following criteria which are critical in ensuring business success:spectrum availability, radio technology availability, low-cost end-userdevices, system scalability and quality of service. Our investigation centers on the technical aspects of these criteria, and thus deals mainly with the assessment of spectrum availability. The availability of spectrum opportunities is found to be ample for adjacent channel usage despite the strict requirements of the radar receiver. However, it is alsovery location-dependent and mostly non-contiguous.Finally, with regard to the regulatory aspects, our results show thatapplying regulatory policies, especially to the deployment of secondary users, can boost availability in cities or urban areas where the capacity demand is high. In addition, Licensed Shared Access (LSA) is identified as a suitable regulatory framework to meet tough protection criteria ofthe radar receivers and to apply the selected regulatory policies to improve exploitation of sharing opportunities. Based on our results and analysis, we conclude that there is a significant amount of spectrum opportunities for large-scale secondary access in the aeronautical and radar bands from the technical point of view. However, the commercial viability of secondary spectrum access is still undetermined giventhe remaining uncertainties regarding its total cost and the exact time needed for relevant technology to become available. Moreover, thereis no single answer to the commercial viability since it will most likelydepend on the country or region in question, which affects the spectrum availability, which in turn is a key criterion for business success. Futurework should therefore strive to clarify these uncertainties and to identify new responsibilities for all the entities involved in the LSA framework. Moreover, a quantitative evaluation would be needed to obtain more explicit conclusions on the business viability.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. viii, 58 p.
Series
TRITA-ICT-COS, ISSN 1653-6347 ; 14:04
National Category
Telecommunications Communication Systems
Research subject
SRA - ICT
Identifiers
urn:nbn:se:kth:diva-144861 (URN)
Public defence
2014-05-26, Sal D, Forum Building, Isafjordsgatan 39, Kista, 14:00 (English)
Opponent
Supervisors
Funder
ICT - The Next Generation
Note

QC 20140519

Available from: 2014-05-19 Created: 2014-04-29 Last updated: 2014-05-19Bibliographically approved

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