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Elektro- och informationsteknik

Lunds Tekniska Högskola | Lunds universitet

Kalendariumarkiv

Seminar: Adaptive and reconfigurable antennas for mobile communications (Prof. Ville Viikari)

Publicerad: 2018-09-20

Preseated by: Associate Professor Ville Viikari from Aalto Universit, and opponent at Alexander Bondarik's defence

Topic: Adaptive and reconfigurable antennas for mobile communications

Time: Fri Oct 5 at 14.15

Place: E:2311

När: 2018-10-05 14:15 till 2018-10-05 14:15
Plats: E-huset, Ole Römers väg 3. Start in EIT Lunch-room (E:2311) 


 


PhD Dissertation: Microstrip Antennas for 60 GHz Band Application

Publicerad: 2018-05-31

Author: Alexander Bondarik

Opponent: Ville Viikari, Associate Professor at Aalto University, Finland

When: 5 October at 10.15

Loaction: Lecture hall E:1406, building E, Ole Römers väg 3, Lund University, Faculty of Engineering LTH, Lund

Thesis abstract:  The next generation of mobile networks will exploit frequencies above 5 GHz and will use a wide available bandwidth for high speed data communication. At the time of writing this thesis work is ongoing to launch into the market a communication system operating between 25 GHz and 30 GHz. Following news about 40 GHz spectrum acquisition by telecommunication companies, it will be the next in turn. At the same time there is a continued interest on frequencies around 60 GHz, with potential applications not limited by mobile networks. The main reason for this development is that there is about 7 GHz of available unlicensed bandwidth around the world due to the electromagnetic waves absorption peak in the atmosphere.

This dissertation is devoted to microstrip antenna design at 60 GHz band. The main challenge addressed in the thesis is a wideband antenna design with high directivity and efficiency to overcome the free space propagation loss and atmosphere attenuation. In  ddition, the presented antennas are suitable for a reliable fabrication and have small thickness, which might be critical for the antenna integration. A single antenna and an array antenna are designed and manufactured. A wideband high gain antenna and an array design on a ceramic substrate, which is suitable for multilayer fabrication and system integration is presented in Paper I. A novel gridded parasitic patch microstrip antenna design and fabrication on a polytetrauoroethylene substrate is presented in Paper II. A comparison with similar conventional antenna designs is provided showing better characteristics for the designed antenna. During the antenna measurements the effect of surface waves propagation was identified. To suppress this unwanted radiation an electromagnetic band-gap structure around the antenna is designed and manufactured, the results are presented in Paper III. Two array antenna configurations for the gridded parasitic patch antenna are presented in Paper IV.

The second topic of the dissertation is an investigation of reconfigurability of a gridded parasitic patch antenna pattern. The principles using switches and varactors implementation are discussed in Paper II. The results of the proof-of concept fabrication using narrow  etal strips imitating switch connection are presented in Paper V. An implementation using Schottky diodes as switches is presented in Section 5 of the introduction part of the thesis.

The third topic of the dissertation is an antenna integration with a power amplier using bond wires. In Section 6 of the introduction part a planar antenna array integration with the injection locked power amplifier is presented. In Paper VI the same antenna is integrated with a two-stage power amplifier. Simulated and measured results are presented.

När: 2018-10-05 10:15 till 2018-10-05 10:15
Plats: Lecture hall E:1406, building E, Ole Römers väg 3, Lund University, Faculty of Engineering LTH, Lund


 


AIML workshop: Academy-Society Collaboration

Publicerad: 2018-07-30

Workshop on academy-society collaboration on artificial intelligence and machine learning.

Programme overview

9.30 Coffee and mingle

10.15-12.00 Mornings session

12:00-13:15 Lunch sandwich in the foyer 

12.30 Mingle, exhibition, posters, workshops, demos etc.

14.15 Wrap-up in plenum

14.50 Upcoming events

15.00 and onwards Coffee and continued discussions in the foyer

Programme web page: http://aiml.lu.se/events/2018-09-26-collaboration/

Registration: http://aiml.lu.se/events/2018-09-26-collaboration/registration/

När: 2018-09-26 09:30 till 2018-09-26 15:00
Plats: MA:6, Matteannexet, Sölvegatan 20, Lund
Kontakt: Karl.Astrom@math.lth.se


 


IoT with a soft touch

Publicerad: 2018-09-06

We invite you to get inspired and share ideas on the soft touch of IoT. This technology can be easily designed to fit in many applications serving our society and a sustainable future.

The program will include:

  • Topical talks on technologies and applications
  • Fika blended with real-life (inter)net-of-people-and-things
  • Interactive panel discussion and wrap-up

The event is supported by the equal opportunities program and Lise Meitner professorship of Lund University. We are looking forward to welcoming diverse participants.

Registration is required (free of charge).

The IoT with a Soft Touch Workshop is organised in connection with the Lund Circuit Design Workshop 2018 and we encourage participants to attend both workshops. https://www.lu.se/event/lund-circuit-design-workshop-2018

Call for posters

PhD students attending the workshop are invited to present posters describing their researh. For poster submission, see the workshop website.

Speakers

  • Vanja Pilcanic Samuelsson, Founder, QOITECH
  • Anders Trana, Project Leader for Smart Open Environments, Lund Open City Sensor Network
  • Linh Trang, Master Research Engineer in Network Technology & System Architecture, Sony Mobile
  • Georgina Wilcox, Traffic-Team Site Reliability Engineer, Google

Organising Committee

  • Liestbet van der Perre, KU Leuven/Lund University
  • Emma Fitzgerald, Lund Unviersity
  • Ove Edfors, Lund University,
  • Sara Gunnarsson, Lund University

Contact

  • liesbet [dot] vanderperre [at] kuleuven [dot] be
  • emma [dot] fitzgerald [at] eit [dot] lth [dot] se

När: 2018-09-25 13:15 till 2018-09-25 17:00
Plats: Lund, Biskopshuset
Kontakt: emma.fitzgerald@eit.lth.se


 


Lund Circuit Design Workshop 2018

Publicerad: 2018-08-14

Welcome to the 2018 Lund Circuit Design Workshop

The workshop will offer an overview of research activities in IC design at Lund University. Additionally, invited presentations on related subjects will be given by outstanding experts from both academia and industry.

The workshop is hosted by the Lund University xcellence Center in System Design on Silicon (SoS).

Cost: Free of charge!

More information: http://cdworkshop.eit.lth.se

Registration: Please register no later than 7 September, 2018 at: http://cdworkshop.eit.lth.se/index.php?gpuid=305&L=0

 

 

 

När: 2018-09-24 09:30 till 2018-09-25 15:00
Plats: Grand Hotell, Lund
Kontakt: Pia.Bruhn@eit.lth.se


 


Radio Based Positioning - Digit@LTH seminar by Prof. Fredrik Tufvesson

Publicerad: 2018-08-14

Karta: Ole Römers Väg 3 in Lund, E:2358Speaker:  Fredrik Tufvesson, Prof in Radio Systems

Topic: On Radiobased Positioning

When: 20 September at 9.00-10.00

Where: Lund university, E-huset, Ole Römers väg 3. Start in EIT Lunch-room (E:2328) 

Abstract
Positioning and localization are becoming more and more important in our everyday life. GPS and other satellite-based solutions provide possibilities to locate ourselves and GPS enabled devices, but there is a need for higher accuracy, low cost solutions and more robust performance in challenging scenarios such as indoors and in street canyons where the satellites are shadowed by the buildings. In this talk, we discuss the fundamentals of radio based positioning and how we can use cellular signals to perform positioning and localization in a new way with improved performance. We discuss current trends in 5G and how they will influence positioning and localization possibilities. Finally, we also discuss how machine learning can be used to learn the details of the radio environment to complement camera or Lidar based positioning.

Bio 
Fredrik Tufvesson received his Ph.D. in 2000 from Lund University in Sweden. After two years at a startup company, he joined the department of Electrical and Information Technology at Lund University, where he is now professor of radio systems. His main research interest is the interplay between the radio channel and the rest of the communication system with various applications in 5G systems such as massive MIMO, mm wave communication, vehicular communication and radio based positioning.

Fredrik has authored around 80 journal papers and 140 conference papers, he is fellow of the IEEE and recently he got the Neal Shepherd Memorial Award for the best propagation paper in IEEE Transactions on Vehicular Technology and the IEEE Communications Society best tutorial paper award.

Registration closed...

 

 

När: 2018-09-20 09:00 till 2018-09-20 10:00
Plats: E-huset, Ole Römers väg 3. Start in EIT Lunch-room (E:2328) 
Kontakt: Jonas.Wisbrant@cs.lth.se


 


Lic. Seminar: Improving Throughput and Minimising Age of Information in dense WLANs, Using Cooperative Techniques by Antonio Fra

Publicerad: 2017-12-13

Title: Improving Throughput and Minimising Age of Information in dense WLANs, Using Cooperative Techniques

Presenter: Antonio Franco - see portal.research.lu.se

Reviewer: Professor Markus Fiedler, Blekinge Institute of Technology (BTH)

Supervisor: Professor Björn Landfeldt, EIT

Examiner: Universitetslektor Erik Larsson, EIT

Abstract

Mobile and wireless data are in increasing demand worldwide. New trends such the Internet of Things paradigm and the Smart City paradigm describe scenarios comprising thousands of devices all exchanging informations between each others wirelessly ? or through the WAN to another device, possibly connected to another WLAN. Operators and radio engineers are faced with the problem of designing efficient ways to share the electromagnetic spectrum ? a scarce and expensive resource ? between thousands of devices.

In this context, operators look at the unlicensed spectrum as possible solu- tion to complement the existing infrastructure. Unfortunately, the IEEE 802.11 MAC family, the most widespread MAC protocol in the unlicensed portion of the spectrum, still suffers when managing a large number of interconnected devices. In this thesis we are both addressing the open problems in the IEEE 802.11 MAC scheme and our contributions on their solution. 
Specifically, in the first part of the thesis we are going to present the IEEE 802.11 MAC scheme and the challenges it faces, along with solutions already present in literature. We are also going to show a new metric recently defined in literature called the Age of Information (AoI). This new metric is a measure how fresh is the piece of information stored in a remote receiver. It received interest in the literature, but little is known how it behaves in a IEEE 802.11 WLAN.
In the second part of the thesis we present two papers that try to address the problem of designing new protocols that let the devices cooperate in order to achieve a common goal. They specifically focus on two metrics. The first paper addresses throughput and collisions reduction through a new MAC scheme that uses RSSI to identify other devices in a WLAN, and uses a priority base access system in order to cooperate in turns with them. We show, through simulation, that this scheme outperforms the classical IEEE 802.11 DCF mode of operation, especially in WLANs subject to high loads.

The second paper addresses the AoI both in terms of average and variance, for sensor nodes immersed in a dense WLAN that send pieces of information to a remote server via a WAN connection. We study both those metrics for a link with high variance and low variance delay. We construct and test, via means of simulations, an AoI-aware MAC, called LUPMAC - Latest Update Medium Access Scheme, aimed at reducing both the average AoI and the AoI variance at the remote server side, being also resilient to variations on the wired remote connection.

In those two papers we present two schemes suitable for the unlicensed spectrum environment, addressing both scheduling and queuing policies. They are only slight modifications to the already widely deployed IEEE 802.11 MAC. They significantly improve the metrics they focus on. They tend not to rely on a centralized unit, as most random access schemes do, and let the devices cooperate to a certain extent in order not to pollute the channel with undesired retransmissions. 

När: 2018-08-22 13:00 till 2018-08-22 13:00
Plats: E:3139
Kontakt: anne.andersson@eit.lth.se


 


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