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5G Radio Measurements Analysis: Propagation property analysis at 3.5GHz around corners in Kista
KTH, School of Electrical Engineering and Computer Science (EECS).
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

With the development of the next generation network, 5th-Generation Wireless systems (Abbreviated 5G), the demands to provide higher capacity and allow massive amount of user devices and sensors at a wide range of frequency bands are increasing. Exploring higher frequency bands is a good way to help find solutions to improve the capacity and data rate. Previously, researchers at Ericsson have analyzed radio wave propagation properties at 15/28GHz. However, there are still much weakness of higher frequencies like scattering, non-line-of-sight issues and etc. The difficulties to fix these problems leads to the continuous heavy rely on sub-6GHz spectrums. In this project, propagation characteristics at 3.5GHz, which is a typical frequency of the sub-6GHz frequency bands, are explored. By measuring the propagation model at 3.5GHz, the propagation properties can be well understood for better utilizing the spectrum.

In this project, experiments are conducted in an urban scenario on Ericsson 5G Testbed. Channel estimation for each propagation path is acquired on the testbed. Power delay profiles are calculated according to the channel estimation. The measurements are compared with current propagation models, including knife-edge model, street canyon model and diffuse scattering model. The result shows that the measurements fit the models perfectly with several explainable variations. Suggestions for improving the current models are raised to make the model more practical.

Abstract [sv]

Utvecklingen av nästa generations mobiltelefoni, 5G, innebär ökade krav på kapacitet samt antal användare och sensorer över ett brett spann av olika frekvensband. För att förbättra både kapacitet och datahastighet siktar man mot band i högre frekvensområden. Undersökningar kring utbredningsegenskaper i området 15 och 28 GHz har gjorts på Ericsson tidigare. Nu är intresset riktat mot att undersöka egenskaperna vid 3.5 GHz vilket är ett typiskt område i det så kallade sub-6GHz bandet. Mätningar och jämförelser med modeller vid 3.5 GHz ger en bra förståelse av utbredningsegenskaperna.

Det här projektet bygger på mätningar men Ericssons 5G Testbed i stadsmiljö. Kanalestimat för utbredningsvägarna är insamlade från mätningar. Impulssvar är framräknade från kanalestimaten och mätningarna är sedan jämförda med utbredningsmodeller som knife-edge, street canyon och diffuse scattering. Resultaten visar att mätningarna följer modellerna väl med ett antal förklarbara undantag.

Place, publisher, year, edition, pages
2018. , p. 52
Series
TRITA-EECS-EX ; 2018:371
Keywords [en]
3.5GHz; 5th generation network (5G); Propagation; Diffraction; Reflection; Testbed
Keywords [sv]
3.5GHz; 5G; Radioutbredning; Diffraktion; Reflektion; Testbed
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-254333OAI: oai:DiVA.org:kth-254333DiVA, id: diva2:1330816
Subject / course
Electrical Engineering
Educational program
Master of Science - Embedded Systems
Supervisors
Examiners
Available from: 2019-06-26 Created: 2019-06-26 Last updated: 2019-06-26Bibliographically approved

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