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Accuracy of Measurement Data of the I/QData Method VS the Traditional Instrument Method
KTH, School of Electrical Engineering and Computer Science (EECS).
KTH, School of Electrical Engineering and Computer Science (EECS).
2019 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Considering the popularity of Multiple Input Multiple Output implementations of the Radio Base Stations today, it becomes a costlier and more time-expensive process to run tests against them.In an attempt to remedy this, this thesis researches an alternative method to the traditional instrument method used, to perform the measurements during the testing of the radios while maintaining as good of an accuracy as the traditional method provides. The alternative method is referred to, in this report, as the I/Q Data Method and utilises a program that is developed over the span of the project work.The program accepts symbol I/Q data as input to perform computation of the Power (POW) and Error Vector Magnitude (EVM) ratio measurements, which I/Q data are sampled from a spectrum analyser with 5G NR features. These computed measurement values are then attempted to be matched to the spectrum analyser, as best as possible.Multiple limitations have been added to the work due to time-constraints, resulting only for EVM ratio to be tested, even though POW has also been implemented. The results show relatively high accuracy in the EVM ratio calculations performed by the I/Q analyser program, but the program is deemed incomplete by the authors, which has a lot to do with the limitations that hindered development. It is discussed that the program has the potential to further meet the goals of the thesis, with further development.

Abstract [sv]

På grund av populariteten av radiobasstationer idag där fler utoch ingångar blir normen, försvåras testningen av dem som blir en allt mer kostsam och tidskrävande process.I ett försök att underlätta detta, undersöker avhandlingen en alternativ metod för att utföra mätningar under test av radios, där man vill behålla en liknande noggrannhet som den traditionella instrument metoden ger. Den alternativa metoden kallas i denna avhandling som I/Q data metoden och använder sig av ett program som utvecklas under projektets gång. Programmet tar emot I/Q data för att utföra POW och EVM beräkningar, där I/Q data har samlats från en spektrumanalysator med 5G NRfunktioner. Dessa beräknade värden jämförs därefter med givna värden från spektrumanalysatorn.Flera begränsningar fick tilläggas under projektets gång på grund av de tidsbegränsningarna som fanns. Det resulterade i att endast EVM testades, men POW hann också bli implementerat. Resultatet redovisar en hög noggrannhet i de beräknade EVM värde från I/Q analyserings programmet.Programmet anses dock vara ofullständigt till följd av tidsbegränsningar som hindrat utvecklingen men har utvecklingspotential som diskuteras i slutet av avhandlingen.

Place, publisher, year, edition, pages
2019. , p. 29
Series
TRITA-EECS-EX ; 2019:277
Keywords [en]
I/Q data, Error vector magnitude, Power, Symbol, I/Q method
Keywords [sv]
I/Q data, Error vector magnitude, Effekt, Symbol, I/Q metoden
National Category
Computer and Information Sciences
Identifiers
URN: urn:nbn:se:kth:diva-254659OAI: oai:DiVA.org:kth-254659DiVA, id: diva2:1334569
External cooperation
Ericsson AB
Supervisors
Examiners
Available from: 2019-07-03 Created: 2019-07-03 Last updated: 2019-07-03Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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