Novel Cross-Layer QoE-Aware Radio Resource Allocation Algorithms in Multiuser OFDMA Systems
Avtorji: Rugelj, M., Sedlar, U., Volk, M., Sterle, J., Hajdinjak, M., Kos, A.
WEB on TV: Cross-National User Study for Designing Better User Experience
Avtorji: Emilija Stojmenova, Jože Guna, Daniela Hauswirth, Roland Winkler, Manfred Ninaus and Matevž Pogačnik
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Novel Cross-Layer QoE-Aware Radio Resource Allocation Algorithms in Multiuser OFDMA Systems

Objavil: LTFE | 26. sep 2014
Avtorji: Rugelj, M., Sedlar, U., Volk, M., Sterle, J., Hajdinjak, M., Kos, A.

The assurance of quality of experience (QoE) and provisioning of high throughput of the system represent the main goals of future wireless and mobile networks. This paper presents novel and practical cross-layer QoE-aware radio resource allocation (RRA) algorithms for the downlink of a heterogeneous orthogonal frequency division multiple access (OFDMA) system. The objective of the proposed algorithms is to assure the appropriate level of QoE for each user of the system by incorporating application-layer parameters and subjective human perception of quality into the RRA process. We propose two user-oriented joint subcarrier and power allocation algorithms with low complexity for real-time and interactive services. The first algorithm dynamically allocates resources by assuring the same level of QoE to all users of the system, whereas the second algorithm introduces the efficient trade-off between the user’s QoE and the spectral efficiency of the system. By considering application-layer parameters and user’s perception of quality, high users’ QoE and explicit control of data rates can be achieved. The numerical results show that the proposed algorithms achieve significant increase in the level of QoE compared to previous works, a fair distribution of capacity among users and near to optimal solution of QoE for the OFDMA system.


Objavljeno v: IEEE Transactions on Communications publication information (Volume:62, Issue: 9)


WEB on TV: Cross-National User Study for Designing Better User Experience

Objavil: LTFE | 04. okt 2013
Avtorji: Emilija Stojmenova, Jože Guna, Daniela Hauswirth, Roland Winkler, Manfred Ninaus and Matevž Pogačnik


Na konferenci MindTrek, ki je potekala med 1. in 3. oktobrom v Tampere, na Finskem, smo predstavili prispevek “WEB on TV: Cross-National User Study for Designing Better User Experience”
Avtrorji: Emilija Stojmenova, Jože Guna, Daniela Hauswirth, Roland Winkler, Manfred Ninaus and Matevž Pogačnik
In this paper we present the user studies conducted as a part of an international project EU SEE TV-WEB, funded by the European Union. The project combines the traditional broadcast world with the dynamic web environment while focusing on the aspects of usability and user experience in order to provide the best possible experience for the elderly people, economically weak people and people living in rural areas who do not usually use personal computers and who have no Internet connection. The results of the user studies about the media literacy, media use and the target users’ interest about TV-WEB services, conducted as a part of the project in two different European countries i.e. Austria and Montenegro, are also presented. Additionally, we present the user-centered design process for the service that was conducted as a part of the user study in Slovenia.

In this paper we present the user studies conducted as a part of an international project EU SEE TV-WEB, funded by the European Union. The project combines the traditional broadcast world with the dynamic web environment while focusing on the aspects of usability and user experience in order to provide the best possible experience for the elderly people, economically weak people and people living in rural areas who do not usually use personal computers and who have no Internet connection. The results of the user studies about the media literacy, media use and the target users’ interest about TV-WEB services, conducted as a part of the project in two different European countries i.e. Austria and Montenegro, are also presented. Additionally, we present the user-centered design process for the service that was conducted as a part of the user study in Slovenia.


Prispevek je bil predstavljen na konferenci MindTrek, ki je potekala med 1. in 3. oktobrom v Tampere, na Finskem.


Za ogled vsebine si prenesite PDF datoteko.



Arduino kot telematska platforma v pedagoškem procesu

Objavil: LTFE | 25. sep 2013
Avtorji: Štern Andrej, Guna Jože


Arduino kot telematska platforma v pedagoškem procesu
Štern Andrej, FE, Guna Jože
Arduino is an open hardware and software concept designed around Atmel AVR microcontrollers, C-like programming language, intuitive IDE including editor/compiler and lots of pre-made examples to make
development easier. The interface to the programming computer is provided through USB port and built-in
Arduino bootloader. The hardware layout exposes numerous I/O, A/D and PWM ports to be connected to
external communication modules or shields. This paper presents the practical evaluation of telematic
systems during laboratory practices at our faculty, describing numerous possibilities to evolve this concept further in the direction of ubiquitous IoT.
Za ogled vsebine si prenesite PDF datoteko.
Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.

Arduino is an open hardware and software concept designed around Atmel AVR microcontrollers, C-like programming language, intuitive IDE including editor/compiler and lots of pre-made examples to make development easier. The interface to the programming computer is provided through USB port and built-in Arduino bootloader. The hardware layout exposes numerous I/O, A/D and PWM ports to be connected to external communication modules or shields. This paper presents the practical evaluation of telematic systems during laboratory practices at our faculty, describing numerous possibilities to evolve this concept further in the direction of ubiquitous IoT.


Za ogled vsebine si prenesite PDF datoteko.

Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.


“Malinca – RaspberryPi” kot multimedijska učna platforma

Objavil: LTFE | 25. sep 2013
Avtorji: Guna Jože, Štern Andrej


Malinca – RaspberryPi« kot multimedijska učna platforma
Guna Jože, Štern Andrej
We present the RaspberryPi embedded computer and its applications as the multimedia learning platform for the students. Four different practical use cases are presented; from a simple Linux computer to a powerful multimedia centre with Ambilight capabilities. The RPi platform also incorporates several general purpose input/output interfaces, such as SPI, serial and I²C.
Thus it can be used in a smarthouse environment as an embedded controller and signal processor. The last case study shows some of this potential where RPie is used as a general purpose LED controller, visualizing different ambient parameters, such as temperature or energy consumption. Finally we discuss the possibilities of the RPi platform in the learning environment.
Za ogled vsebine si prenesite PDF datoteko.
Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.

We present the RaspberryPi embedded computer and its applications as the multimedia learning platform for the students. Four different practical use cases are presented; from a simple Linux computer to a powerful multimedia centre with Ambilight capabilities. The RPi platform also incorporates several general purpose input/output interfaces, such as SPI, serial and I²C. Thus it can be used in a smarthouse environment as an embedded controller and signal processor. The last case study shows some of this potential where RPie is used as a general purpose LED controller, visualizing different ambient parameters, such as temperature or energy consumption. Finally we discuss the possibilities of the RPi platform in the learning environment.


Za ogled vsebine si prenesite PDF datoteko.

Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.


Modeliranje in simulacija z uporabo okolja E-CHO

Objavil: LTFE | 24. sep 2013
Avtorji: Papić Marko, Atanasijević-Kunc Maja, Logar Vito, Blažič Sašo, Belič Aleš, Bešter Janez

In the paper the most important properties and functionalities of E-CHO program are first presented. This e-learning platform was developed at the Faculty of Electrical Engineering, University of Ljubljana. The education and research environment where different scientific areas are studied is an ideal environment which stimulates a constant improvement of this teaching possibility from technological as well as from pedagogical view point. In the paper this is illustrated for the area of modelling and simulation, where remote experimentation (as more or less demanding projects) can extend teaching efficacy of the lectures or can be organized as motivation projects at different levels of the study. At the end of the paper the goals for the future work are indicated.

Modeliranje in simulacija z uporabo okolja E-CHO
Papić Marko, FE Atanasijević-Kunc Maja, Logar Vito, Blažič Sašo, Belič Aleš, Bešter Janez, FE
Za ogled vsebine si prenesite PDF datoteko.
Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.


Za ogled vsebine si prenesite PDF datoteko.

Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.


Analiza zajetih vhodnih in izhodnih parametrov hladilne tehnike za potrebe optimizacije stroškov in porabe hladilne tehnike nakupovalnih centrov

Objavil: LTFE | 23. sep 2013
Avtorji: Vidrih Špela, Umberger Mark, Humar Iztok


Analiza zajetih vhodnih in izhodnih parametrov hladilne tehnike za potrebe optimizacije stroškov in porabe hladilne tehnike nakupovalnih centrov
Vidrih Špela, Umberger Mark, Humar Iztok
Large shopping centres consume a significant share of electric energy produced within which the biggest part
is consumed by their refrigeration systems. This paper provides analysis of the data captured inside
refrigeration systems of four large shopping centres in Ljubljana. The data consists of influential parameters as
well as of various modes of consumption measurements, which alltogether provides a detailed look into
refrigeration system as a whole and finally, offers great potential in optimization of electric energy consumption
and the associated costs. The paper exposes the parameters that have a major impact on system performance and suggests improvements.
Za ogled vsebine si prenesite PDF datoteko.
Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.

Large shopping centres consume a significant share of electric energy produced within which the biggest part is consumed by their refrigeration systems. This paper provides analysis of the data captured inside refrigeration systems of four large shopping centres in Ljubljana. The data consists of influential parameters as well as of various modes of consumption measurements, which alltogether provides a detailed look into refrigeration system as a whole and finally, offers great potential in optimization of electric energy consumption and the associated costs. The paper exposes the parameters that have a major impact on system performance and suggests improvements.


Za ogled vsebine si prenesite PDF datoteko.

Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.


Mobile network measurements using Android

Objavil: LTFE | 23. sep 2013
Avtorji: Molina Albero Fernando, Štern Andrej, Kos Andrej


Mobile network measurements using Android
Molina Albero Fernando, Štern Andrej, Kos Andrej
Introducing a mobile telephony standard requires the cooperation of many engineers. Once implemented
the networks require many improvements on the longterm scale. Lots of research is performed at the
universities and similar research institutions with limited access to expensive measurement equipment.
Introducing the new generations of mobile devices, e.g. smart phones, enables the development of applications
with functions which can be compared to sophisticated professional measurement systems. This paper shows the possibilities of optimizing the process of measurement by using a widely spread Android devices. By using the open source tools the measurement applications can be offered to a vast community providing huge datasets and lowering the overall measurement costs.
Za ogled vsebine si prenesite PDF datoteko.
Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.

Introducing a mobile telephony standard requires the cooperation of many engineers. Once implemented the networks require many improvements on the longterm scale. Lots of research is performed at the universities and similar research institutions with limited access to expensive measurement equipment. Introducing the new generations of mobile devices, e.g. smart phones, enables the development of applications with functions which can be compared to sophisticated professional measurement systems. This paper shows the possibilities of optimizing the process of measurement by using a widely spread Android devices. By using the open source tools the measurement applications can be offered to a vast community providing huge datasets and lowering the overall measurement costs.


Za ogled vsebine si prenesite PDF datoteko.

Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.


Optimizacija meritev omrežij LTE

Objavil: LTFE | 22. sep 2013
Avtorji: Štern Andrej


Optimizacija meritev omrežij LTE
Štern Andrej
Mobile operators are continuously monitoring, developing and enhancing their networks. The traditional way of assuring coverage, capacity and quality is performing drive tests by using specially adapted equipment in a test car or by hand in selected indoor situations. These approaches consume significant human efforts and high operation costs but still provide only limited coverage and efficiency. This paper outlines the innovative concepts of performing higher quality assurance by automated measurement solutions including involvement of
commercial user equipment through functionalities like MDT (Minimization of Drive Tests) and SON (Self Organizing Networks).
Za ogled vsebine si prenesite PDF datoteko.
Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.

Mobile operators are continuously monitoring, developing and enhancing their networks. The traditional way of assuring coverage, capacity and quality is performing drive tests by using specially adapted equipment in a test car or by hand in selected indoor situations. These approaches consume significant human efforts and high operation costs but still provide only limited coverage and efficiency. This paper outlines the innovative concepts of performing higher quality assurance by automated measurement solutions including involvement of commercial user equipment through functionalities like MDT (Minimization of Drive Tests) and SON (Self Organizing Networks).


Za ogled vsebine si prenesite PDF datoteko.

Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.


Usmerjevalni protokoli v brezžičnih omrežjih med vozili

Objavil: LTFE | 21. sep 2013
Avtorji: Ščavničar Gregor, Vodopivec Samo, Bešter Janez


Usmerjevalni protokoli v brezžičnih omrežjih med vozili
Ščavničar Gregor, Vodopivec Samo, Bešter Janez
.
Vehicular Ad Hoc Networks (VANET) is an emerging technology in the field of Intelligent Transportation Systems (ITS). It has lots of potential since it will be able to prevent accidents and deliver more comfortable
driving experience to all passengers in the vehicle. Vehicles will become nodes in the network and
exchange safety and other types of messages. For this to become a reality there is a need of a set of rules that
creates and maintains a route and forwards messages on this route. Routing is essential in any kind of network
since it enables the propagation of data from one node to another. Protocols in this type of ad hoc network are
divided into five categories: topology, location, cluster, geocast and broadcast based protocols. Each category
has its own unique way of routing messages which differentiates it from others. In this paper a comparison
between all of the five categories is carried out and the most promising protocols are exposed.
Za ogled vsebine si prenesite PDF datoteko.
Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.

Vehicular Ad Hoc Networks (VANET) is an emerging technology in the field of Intelligent Transportation Systems (ITS). It has lots of potential since it will be able to prevent accidents and deliver more comfortable driving experience to all passengers in the vehicle. Vehicles will become nodes in the network and exchange safety and other types of messages. For this to become a reality there is a need of a set of rules that creates and maintains a route and forwards messages on this route. Routing is essential in any kind of network since it enables the propagation of data from one node to another. Protocols in this type of ad hoc network are divided into five categories: topology, location, cluster, geocast and broadcast based protocols. Each category has its own unique way of routing messages which differentiates it from others. In this paper a comparison between all of the five categories is carried out and the most promising protocols are exposed.


Za ogled vsebine si prenesite PDF datoteko.

Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.


Uporabnost SDR za komunikacijsko-navigacijske rešitve in raziskave v prometu

Objavil: LTFE | 20. sep 2013
Avtorji: Dimc Franc, Ponikvar Miloš, Štern Andrej


Dimc Franc, Ponikvar Miloš, Štern Andrej
The solutions of the vehicles’ signals detection and processing by using the software defined radio (SDR) in
traffic are presented. The study focuses on the solutions of the traffic management systems and safety critical
search and rescue services in the maritime and road traffic. A set of the relevant USRP implementation tasks is added
Za ogled vsebine si prenesite PDF datoteko.
Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.

The solutions of the vehicles’ signals detection and processing by using the software defined radio (SDR) in traffic are presented. The study focuses on the solutions of the traffic management systems and safety critical search and rescue services in the maritime and road traffic. A set of the relevant USRP implementation tasks is added.

Za ogled vsebine si prenesite PDF datoteko.

Prispevek je objavljen v Zborniku 22. mednarodne Elektrotehniške in računalniške konference ERK 2013.