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Vector Measurements for Wireless Network Devices
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences. KTH, Skolan för elektro- och systemteknik (EES), Signalbehandling/ACCESS Linnaeus Centre.ORCID iD: 0000-0001-8460-6509
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Wireless networks are an iconic technology of today’s modern era, theyare present in our daily activities as can be exemplified by cellular communications,wi-fi, bluetooth, and others. Vector measurements play an importantrole in the design, simulation, and testing of wireless networks and are usedto characterize key devices operating in the radio interface, such as amplifiers,filters, and mixers.Accurate characterization is the key for improving the capacity and efficiencyof wireless networks. As the demand for network capacity continuouslyincreases, the accuracy of vector measurements must also improve. Further,it is anticipated that such trends will continue in the years to come. Consequently,the wireless industry needs to include nonlinear behavior in theircharacterization and analysis, to assess and guaranty the operation of the devices,and to comply to the specifications from governmental regulations. Incontrast to linear behavior, nonlinear behavior presents an additional bandwidthrequirement because the signal bandwidth grows when it passes throughnonlinear devices. In this thesis, vector measurements for devices operatingin wireless networks are studied, emphasizing a synthetic approach for theinstrumentation. This approach enables the use of digital post-processing algorithms,which enhances the measurement accuracy and/or speed and canovercome hardware impairments. This thesis presents the design of a vectorialmeasurement system for wireless devices considering the aforementionedtrends and requirements. It also explores the advantages of the proposedapproach, describes its limitations, and discusses the digital signal processingalgorithms used to reach its final functionality. Finally, measurement resultsof the proposed setup are presented, analyzed and compared to those of modernindustrial instruments.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology , 2013. , 45 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2013:004
Keyword [en]
Vector measurements, radio frequency, synthetic instrumentation, bandwidth extension
National Category
Telecommunications
Research subject
Järnvägsgruppen - Elsystem
Identifiers
URN: urn:nbn:se:hig:diva-18940ISBN: 978-91-7501-630-6 (print)OAI: oai:DiVA.org:hig-18940DiVA: diva2:786300
Presentation
2013-02-22, Hörsal 99131, Kungsbäcksvägen 47, Gävle, 13:00 (English)
Opponent
Supervisors
Available from: 2015-02-05 Created: 2015-02-05 Last updated: 2015-02-05Bibliographically approved
List of papers
1. An Envelope Domain Measurement Test Setup to Acquire Linear Scattering Parameters
Open this publication in new window or tab >>An Envelope Domain Measurement Test Setup to Acquire Linear Scattering Parameters
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2008 (English)In: 72nd ARFTG Conf. Dig., Portland, OR, 2008, 54-57 p.Conference paper, Published paper (Refereed)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:hig:diva-3272 (URN)10.1109/ARFTG.2008.4804287 (DOI)978-1-4244-2300-2 (ISBN)
Available from: 2008-12-16 Created: 2008-12-16 Last updated: 2015-02-05Bibliographically approved
2. Nonlinear Network Analysis for Modern Communication Devices and Systems
Open this publication in new window or tab >>Nonlinear Network Analysis for Modern Communication Devices and Systems
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2008 (English)In: 72nd ARFTG Conf. Dig., Portland, OR, 2008, 64-68 p.Conference paper, Published paper (Refereed)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:hig:diva-3273 (URN)10.1109/ARFTG.2008.4804292 (DOI)978-1-4244-2300-2 (ISBN)
Available from: 2008-12-16 Created: 2008-12-16 Last updated: 2015-02-05Bibliographically approved
3. A synthetic vector network analyzing measurement system
Open this publication in new window or tab >>A synthetic vector network analyzing measurement system
2011 (English)In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, Vol. 60, no 6, 2154-2161 p.Article in journal (Refereed) Published
Abstract [en]

In this paper a synthetic vector network analyzing measurement system is presented. The system is based on a hardware set-up, including a signal generator and a vector signal analyzer, with the vector network analyzing functionality implemented in the software. The measurements of the proposed system demonstrated comparable performance in terms of accuracy and speed compared with a modern traditional vector network analyzer, but it is more flexible due to its inherent software implementation. The proposed system’s ability to measure nonlinear phenomena is addressed and discussed, and some preliminary results are given.

Place, publisher, year, edition, pages
Institution of Electrical Engineers (IEE), 2011
Keyword
vector network analyzer, S-parameters, nonlinear, virtual instrument, synthetic instrument
National Category
Control Engineering
Identifiers
urn:nbn:se:hig:diva-9735 (URN)10.1109/TIM.2011.2113132 (DOI)000290538700025 ()2-s2.0-79955971576 (Scopus ID)
Available from: 2011-07-01 Created: 2011-07-01 Last updated: 2015-05-27Bibliographically approved
4. Pilot tone aided measurements to extend the bandwidth of radio frequency applications
Open this publication in new window or tab >>Pilot tone aided measurements to extend the bandwidth of radio frequency applications
2016 (English)In: Measurement, ISSN 0263-2241, E-ISSN 1873-412X, Vol. 90, 534-541 p.Article in journal (Refereed) Published
Abstract [en]

A technique to extend the effective measurement bandwidth of a non-coherent vector receiver is presented. This bandwidth extension technique relies on the use of a pilot signal (known a priori), which is added on the signal of interest and is measured in a single receiver. Compared to other bandwidth extension techniques referred as stitching techniques, the proposed approach avoids error propagation in the measurement bandwidth and simultaneously enables the measurement of signals that do not contain energy in certain spectral bands.

The pilot signal is created in digital stages, which tackles to large extent the requirement of the a priori knowledge of this signal. Further, the pilot signal is designed to minimize estimation errors of the proposed technique, providing enhanced performance. It is analytically shown that the error incurred by the proposed method is always lower than the error from the measurement noise.

Measurement results show the method functionality with an error in the range of −50 dB of the signal measured. Finally, the usefulness of the proposed technique is illustrated by measuring the input and output of an amplifier with dynamic range in excess of 80 dB over 290 MHz using an 18 MHz bandwidth receiver. This measurement could not have been performed by existing stitching techniques.

Keyword
Bandwidth extension, Digitally modulated signals, Noncoherent vector receivers, Vector signal analyzer (VSA), Multisine signal
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:hig:diva-18942 (URN)10.1016/j.measurement.2016.05.005 (DOI)000377389600062 ()2-s2.0-84969632452 (Scopus ID)
Available from: 2013-02-04 Created: 2015-02-05 Last updated: 2017-01-12Bibliographically approved

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