2017-06-16 PhD defense by Babak Mohammadi
Date: June 16, 2017
Place: E 1406
Professor Snorre Aunet, Department of Electronics and Telecommunications, NTNU Trondheim
Professor Marian Verhelst, KU Leuven, Belgium
Professor Atila Alvandpour, Head of Integrated Circuits and Systems Division, Department of Electrical Engineering, Linköping University
Staff engineer Sylvain Clecrc, STMicroelectronics, Crolles, France.
Professor Björn Landfeldt
2017-05-12 PhD defense by Cezar Zota
Date: May 12, 2017
Time: 10.15 -12.30
2017-05-11 Cake seminar
Date: May 11, 2017
Title: “The software developer as the knowledge worker of tomorrow”
Lise Meitner professor "Margaret-Anne (Peggy) Storey is a Professor of Computer Science and the Director of the Software Engineering program at the University of Victoria on the West Coast of Canada. She holds a Canada Research Chair in Human and Social Aspects of Software Engineering. Her research goal is to understand how technology can help people explore, understand, and share complex information and knowledge. She evaluates and applies techniques from knowledge engineering, social software, and visual interface design to applications such as collaborative software development, program comprehension, biomedical ontology development, and learning in Web-based environments.
During her talk, she will give an overview of some of her recent projects, sharing how she uses mixed research methods to investigate how developers use tools such as social media and gamification to collaborate with one another."
2017-05-10 Licentiate Thesis by Payam Amani
Date: May 10, 2017
Place: E:3139, Institutionen för Elektro- och informationsteknik, E-huset, LTH
Title: Resource Management in Computing Systems
Special reviewer: Docent Javid Taheri, University of Karlstad
Supervisor: Universitetslektor Christian Nyberg, EIT
Examinator: Professor Ulf Körner, EIT
Resource management is an essential building block of any modern computer and communication network. In this thesis, the results of our research in the following two tracks are summarized in four papers.
The first track includes three papers and covers modeling, prediction and control for multi-tier computing systems. In the first paper, a NARX-based multi-step-ahead response time predictor for single server queuing systems is presented which can be applied to CPU-constrained computing systems. The second paper introduces a NARX-based multi-step-ahead query response time predictor for database servers. Both mentioned predictors can predict the dynamics of response times in the whole operation range particularly in high load scenarios without changes having to be applied to the current protocols and operating systems. In the third paper, queuing theory is used to model the dynamics of a database server. Several heuristics are presented to tune the parameters of the proposed model to the measured data from the database. Furthermore, an admission controller is presented, and its parameters are tuned to control the response time of queries which are sent to the database to stay below a pre-defined reference value.
The second track includes one paper, covering a problem formulation and optimal solution for a content replication problem in Telecom operator ’s content delivery networks (Telco-CDNs). The problem is formulated in the form of an integer programming problem trying to minimize the communication delay and cost according to several constraints such as limited content replication budget, limited storage size and limited downlink bandwidth of each regional content server. The solution of this problem is a performance bound for any distributed content replication algorithm which estimates the same problem.
2017-04-26 Information meeting on project applications to the Knut and Alice Wallenberg Foundation
Date: 26 April 2017
Time: 15.00 -17.00
Location: Pangea, Geologiska institutionen, Geocentrum II, Sölvegatan 12, Lund
Title: Information meeting on project applications to the Knut and Alice Wallenberg Foundation
Organizers: LTH, Faculty of Medicine, Faculty of Science and Research Services
2017-04-26 Welcome to the ELLIIT workshop in Lund April 26-27
More info on the ELLIIT workshop.
2017-04-06 Tårtseminarium i E-huset 6/4 med Liesbet Van der Perre, Lise Meitner professor
Titel: About setting up communication with bridges, and crossing them.
Tid: tor 6 april kl 14.06
Plats: E-huset LTH, E:1406
Välkommen till ett seminarium med professor Liesbet Van der Perre från KU Leuven i Belgien – under åren 2016-2019 verksam som Lise Meitner professor på institutionen för elektro- och informationsteknik (EIT). Van der Perre är en framstående expert inom trådlös kommunikation och samarbetar med EIT om framtidens 5G mobiltelefonsystem. Van der Perre utsågs även 2015 till hedersdoktor vid Lunds universitet.
Lise Meitner professuren är ett exempel på det arbete som ständigt pågår för att LTH skall attrahera de bästa talangerna och vara en plats för jämställdhet och mångfald. Genom denna gästprofessur bjuds en framstående forskare in till LTH för att under en tid bedriva sin forskning och fungera som förebild.
Professuren är uppkallad efter kärnfysikern Lise Meitner som var verksam när den fysikaliska vetenskapen revolutionerades. Ett långt samarbete mellan forskarna Otto Hahn och Lise Meitner ledde till upptäckten av fission (fission som i klyvningen av atomkärnor). 1944 skulle fissionsprocessen komma att belönas med Nobelpriset. Priset tilldelades endast Hahn och än idag råder delade meningar om varför Meitner inte fick dela detta pris och få samma erkännande.
2017-03-31 PhD Thesis defense by Hemanth Srinivas Prabhu
Date: Mar 31, 2017
2017-03-24 PhD Thesis defense by Rakesh Gangarajaiah
Date: Mar 24, 2017
2017-03-24 Master Thesis presentation by Yaqin Chen.
Date: Friday March 24
Title: Evaluating Off-the-shelf Hardware for Indoor Positioning
Master Thesis presentation by Yaqin Chen.
Supervisors: Fredrik Tufvesson, Peyman Hamed Seyed Hosseini, Sigma Connectivity
Examiner: Fredrik Rusek
An indoor positioning system (IPS) is a system to locate objects in indoor environments using radio waves, magnetic fields, acoustic, optical and video signals or other sensory information with help of a number of known reference positions. Nowadays, indoor positioning based services are used in a wide variety of areas and indoor positioning is getting considerable attention from both research and industry. Building indoor positioning systems using off-the-shelf hardware can considerably reduce the cost of the system implementation.
In this master thesis, three kinds of off-the-shelf hardware based on Ultra-Wideband (UWB), WiFi and Bluetooth low energy (BLE) technology respectively are exploited to build up indoor positioning systems. Evaluation and comparison of these three systems are performed through a comprehensive study of the related theory, practical experiments and brief study of off-the-shelf hardware.
Commonly used radio positioning technologies and basic indoor positioning techniques are studied as the foundation of the practical experiments. Accuracy, power consumption, cost and ease of deployment are defined as criteria to evaluate and compare the three systems. A systematic method for deploying these three positioning systems for practical experiments is presented and discussed. A trilateration positioning algorithm is implemented for these three systems to estimate positions and compare accuracy. Results from experiments for both line of sight and none line of sight scenarios are given. Results from a brief study of off-the-shelf hardware for a rough qualitative comparison of power consumption and cost of these three evaluated hardware are presented. Furthermore, obstruction experiments were performed to observe influences of the obstacles on accuracy for these three hardware. Finally, suggestions on future work are provided.
The evaluation shows that the UWB hardware performs the best accuracy for indoor positioning, in centimeter order, but it costs more than the WiFi and BLE hardware. The BLE hardware provides worst indoor positioning accuracy, around 4.5 m in average. However, it is the cheapest and most power consumption efficient among these three evaluated hardware. The WiFi hardware is a kind of a trade-off between the UWB and BLE hardware in terms of indoor positioning, giving medium level accuracy, power consumption and cost. The BLE hardware is easier to deploy compared to the UWB and WiFi hardware as BLE devices are smaller size and able to be powered by coin batteries and thus can avoid external physical connections. However, the RSS-based BLE IPS need proper propagation model to estimate distances, which adds extra workload for the deployment compared to the UWB and WiFi IPSs. Obstruction experiments show that obstacles degrade ranging performance greatly for all of these three hardware and influence on the BLE hardware is the most severe.
2017-03-17 PhD Thesis defense by Farrokh Ghani Zadegan
Date: Mar 17, 2017
Occasion 2: Open lectures with information on The Conversation
Date: Mar 02, 2017
Time: 09.00 - 10.00
Place: School of Economics and Management, Crafoordsalen, ground floor of the faculty building, Tycho Brahes väg 1, Lund
Presentation of a tool, The Conversation, for all researchers to publish popular science work under their own names.
Occasion 1: Open lectures with information on The Conversation
Date: Feb 27, 2017
Time: 15.00 - 16.00
Place: Palaestra (lower), Universitetsplatsen
Presentation of a tool, The Conversation, for all researchers to publish popular science work under their own names.
2017-02-23 Presentation by Johan Lundgren
Date: Thursday Feb 23
Johan Lundgren will present "Standards in Notation of Mathematics and Physics" where he will talk about how to properly use the most common symbols and quantities in a correct manner based on the not to well-known international standard, ISO-80000. He guarantees that no one follows this standard completely (yet (!)), and that everyone can improve their notation with some easy fixes.
Should this index be italic or roman?
Are units in Roman or italic?
How do I type constants correctly?
2017-02-14 Licentiate presentation by Dimitrios Vlastaras
Date: Feb 14, 2017
Opponent: Dr. Katsuyuki Haneda, Aalto University, Helsingfors, Finland.
Examinator: Doc. Anders J Johansson
Supervisor: Prof. Fredrik Tufvesson
Assistant supevisor: Prof. Ove Edfors
Title: Vehicular Communication in Obstructed and Non Line-of-Sight Scenarios
Since the invention of the first car available to masses, the 1908 Ford Model T, technology has advanced towards making car travel safer for occupants and bystanders. In recent years, wireless communication has been introduced in the vehicular industry as a means to avoid accidents and save lives.
Wireless communication may sometimes be challenging due to obstacles in the physical world that interact with wireless signals. Such obstacles may be dynamic, e.g. other vehicles in the traffic flow, or static, e.g. nearby buildings. Two scenarios are defined to describe those cases. The obstructed line-of-sight (OLOS) scenario is described as the case where a smaller obstacle, usually a vehicle, is placed in-between a transmitter and a receiver. This obstacle usually partially blocks communication and the receiver often moves in an out of the line-of-sight. The non line-of-sight (NLOS) scenario is described as the case where a larger obstacle completely blocks communication between a transmitter and a receiver. An example would be a building at an intersection which shadows the communication between two vehicles. In this thesis the OLOS and NLOS scenarios are investigated from different points of view.
In chapter 2, a road side unit (RSU) that has been constructed and evaluated for integrating older vehicles without wireless communication with newer vehicles using wireless communication is described. Older vehicles are being detected using a universal medium-range radar and their position and speed vectors are broadcasted wirelessly to newer vehicles. Tests have been performed by using the system in parallel with wireless enabled vehicles; by comparing the content in the messages obtained from both systems, the RSU has been found to perform adequately. Accuracy tests have been performed on the system and Kalman filtering has been applied to improve the accuracy even further.
Chapter 3 focuses on the OLOS scenario. A truck as an obstacle for wireless vehicular communication is being investigated. Real life measurements have been performed to characterize and model the wireless channel around the truck. The distance dependent path loss and additional shadowing loss due to the truck is analyzed through dynamic measurements. The large scale fading, delay and Doppler spreads are characterized as a measure of the channel dispersion in the time and frequency domains. It has been found that a truck as an obstacle reduces the received power by 12 and 13 dB on average in rural and highway scenarios, respectively. Also, the dispersion in time and frequency domains is highly increased when the line-of-sight is obstructed by the truck. A model for power contributions due to diffraction around the truck has also been proposed and evaluated using the previously mentioned real life measurements. It has been found that communication may actually be possible using solely diffraction around a truck as a propagation mechanism.
Finally, in chapter 4 a wireless channel emulator that has been constructed and evaluated is described. Modem manufacturers face a challenge when designing and implementing equipment for highly dynamic environments found in vehicular communication. For testing and evaluation real-life measurements with vehicles are required, which is often an expensive and slow process. The channel emulator proposed is designed and implemented using a software defined radio (SDR). The emulator together with the proposed test methodology enables quick on-bench evaluation of wireless modems. It may also be used to evaluate modem performance in different NLOS and OLOS scenarios.
2017-02-03 PhD Thesis defense by Gabriele Costanza
Date: Feb 3, 2017
Place: LTH, E-huset, Room 1406