{"title":"Impedance considerations for inductive coupling in the EMVCo test environment","authors":"M. Gebhart","doi":"10.1109/ConTEL.2015.7231210","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231210","url":null,"abstract":"Contactless Payment incorporates the Proximity card specification for the physical-layer of the air interface. The physics is based on the coupling of resonant loop antenna circuits in the inductive near-field. Two main effects determine the near-field communication channel in the 13.56 MHz ISM frequency band: A strong decrease of H-field with increasing distance between reader and card, and a shift of resonance, or in fact a change of impedance. Understanding this impact on the reader antenna impedance as a function of coupling with the card, which also incorporates a certain impedance, is key to understanding all specified aspects of the physical-layer at the air interface. We investigate this impedance for the EMVCo test environment under operating conditions, with direct measurement and using analytical equations. We provide equivalent circuit element values for the specified test devices and also impedance values for positions in the operating volume.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134340133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Vuković, Pavle Skocir, Damjan Katusic, D. Jevtić, Daniela Trutin, Luka Delonga
{"title":"Estimating real world privacy risk scenarios","authors":"M. Vuković, Pavle Skocir, Damjan Katusic, D. Jevtić, Daniela Trutin, Luka Delonga","doi":"10.1109/ConTEL.2015.7231214","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231214","url":null,"abstract":"User privacy is becoming an issue on the Internet due to common data breaches and various security threats. Services tend to require private user data in order to provide more personalized content and users are typically unaware of potential risks to their privacy. This paper continues our work on the proposed user privacy risk calculator based on a feedforward neural network. Along with risk estimation, we provide the users with real world example scenarios that depict privacy threats according to selected input parameters. In this paper, we present a model for selecting the most probable real world scenario, presented as a comic, and thus avoid overwhelming the user with lots of information that he/she may find confusing. Most probable scenario estimations are performed by artificial neural network that is trained with real world scenarios and estimated probabilities from real world occurrences. Additionally, we group real world scenarios into categories that are presented to the user as further reading regarding privacy risks.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132922132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Delay profiles for indoor diffused visible light communication","authors":"S. Sheikh Muhammad","doi":"10.1109/ConTEL.2015.7231193","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231193","url":null,"abstract":"This paper targets the computation and analysis of time dispersion characteristics and power delay profile of visible light communication (VLC) channel for an indoor diffused environment. A generalized conventional ray tracing model has been adapted through parametrization of the wavelength dependence of white LED characteristics as well as the spectral reflectance of selected indoor reflectors. The power delay profile and the rms delay spread for the VLC system have been evaluated. Two different transmitter topologies have been proposed to compare the time dispersion characteristics of the VLC system. It has been demonstrated by simulation results that the axis-excited configuration exhibits lesser rms delay spread as compared to the corner-excited configuration and improves the system data rate by more than 5 Mbps.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121305536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Multi-criteria decision for small cell switch off in ultra-dense LTE networks","authors":"A. Dudnikova, P. Dini, L. Giupponi, D. Panno","doi":"10.1109/ConTEL.2015.7231191","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231191","url":null,"abstract":"The concept of a densely deployed heterogeneous network is one of the main approaches of modern wireless networking research to satisfy the growth of the traffic demand. However, such trend leads to a significant network energy consumption increment. One of the effective techniques to save energy is to switch off some underutilized cells during off peak hours. In this line, the focus of this paper is to decide the number of base stations to switch off in order to maximize the energy saving, while maintaining coverage, capacity and Quality of Service. We use a combination of Grey Relational Analysis and Analytic Hierarchy Process tools to trigger the switch off actions, jointly considering multiple decision inputs for each cell. The co-tier interference, typical of small cell networks, is also considered in the decision making by introducing a graph - based technique for dynamic resource allocation.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122070990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Mehta, B. O’Sullivan, Cemalettin Ozturk, L. Quesada
{"title":"An adaptive large neighbourhood search for designing transparent optical core network","authors":"D. Mehta, B. O’Sullivan, Cemalettin Ozturk, L. Quesada","doi":"10.1109/ConTEL.2015.7231187","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231187","url":null,"abstract":"In this paper, we focus on designing a core optical network. Given a set of Metro-Core (MC) nodes, the problem is to select a set of links such that the maximum distance between any pair of nodes is bounded. The primary objective is to minimise the total length of the links followed by a secondary objective which is to minimise the total length of the paths between the pairs of MC nodes. We present a mixed integer programming (MIP) model for this problem. As the size of the instances of this problem increases, the MIP model does not scale in terms of memory and time. We therefore present an adaptive large neighbourhood search (LNS) algorithm where the idea is to find an initial solution and repeatedly improve it by solving relatively small subproblems. We propose two different ways of selecting subproblems. The experiments are performed using 3 real-world network topologies: Ireland, UK and Italy. Our results demonstrate that the developed approach is suitable for solving large networks and it can compute very high quality solutions which are very close to optimal values.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114756438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"IB-DFE based equalizer for constant envelop OFDM systems","authors":"R. Magueta, Adão Silva, R. Dinis, A. Gameiro","doi":"10.1109/ConTEL.2015.7231217","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231217","url":null,"abstract":"Constant envelope OFDM (CE-OFDM) is a promising modulation technique for future millimeter wave (mmW) based wireless communications, since it allows low-cost and highly efficient power amplification based on strongly nonlinear amplifiers. The aim of this paper is to design a new iterative space-frequency equalizer, based on iterative block decision feedback equalization (IB-DFE) principle, for multiplexing MIMO CE-OFDM based systems. The equalizer is designed to take into account both inter-block and residual inter-carrier interferences by efficiently exploit the space-frequency diversity order inherent to these systems. The matrices for this iterative space-frequency equalizer are obtained by minimizing the overall mean square error (MSE) of all data streams at each subcarrier. Our iterative scheme significantly outperforms the linear frequency domain equalizers, recently considered for CE-OFDM, with only a few iterations.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124912293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Prototype-driven software development process for augmentative and alternative communication applications","authors":"Jurica Babic, Iva Slivar, Z. Car, V. Podobnik","doi":"10.1109/ConTEL.2015.7231204","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231204","url":null,"abstract":"The paper presents software development model for implementation of communication and education applications based on Augmentative and Alternative Communication (AAC). Target user group of these applications are people with disabilities, specifically people with complex communication needs. Development process of such applications should follow specific principles to successfully implement all functional and accessible features that applications should contain in order to be accessible and highly usable. Furthermore, development process should be enriched with specific methodologies and approaches in its particular phases in order to fully exploit a necessary synergy of multidisciplinary team consisting of experts from information and communication technology, rehabilitation and education, psychology and graphic design. The presented model was defined during extensive developmental activities over two years period and evaluated on the number of publicly available case-study web and mobile AAC applications.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127945214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Modeling the nonlinearity of polarizing beam splitters in nano-displacement measurement of laser encoder using Jones matrix analysis","authors":"S. Olyaee, Abdollah Gorgani Firoozjah","doi":"10.1109/ConTEL.2015.7231188","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231188","url":null,"abstract":"In this paper, nonlinearity error of a laser encoder is modeled by using the Jones matrix analysis. In the nano-metrology system we suppose that polarizing beam splitters are imperfect. The intensity of interference signals on photodetectors are obtained and simulated by MATLAB software. The nano-displacement of scale grating is simulated by Arctangent method. We show that maximum nonlinearity error phase is equal to 0.07166 rad when the pitch of scale grating and wavelength of the laser are 1 μm and 685 nm, respectively.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129706641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Norbert Bátfai, Renátó Besenczi, Andras Mamenyak, M. Ispány
{"title":"OOCWC: The robocar world championship initiative","authors":"Norbert Bátfai, Renátó Besenczi, Andras Mamenyak, M. Ispány","doi":"10.1109/ConTEL.2015.7231223","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231223","url":null,"abstract":"Robocar World Championship or briefly OOCWC is a new initiative to create a community of people who share their interest in investigating the relationship between smart cities and robot cars with particular attention to the spread of robot cars in the near future. At the heart of this initiative is the Robocar City Emulator. It is intended to offer a common research platform for the investigation of the smart city simulations. In this paper, we review the recent advances of OOCWC.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130561707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Trends in evolution of the network traffic of Massively Multiplayer Online Role-Playing Games","authors":"M. Sužnjević, M. Matijasevic","doi":"10.1109/ConTEL.2015.7231199","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231199","url":null,"abstract":"The history of online video games spans over 30 years, with Massively Multiplayer Online Role-Playing Games (MMORPG) being one of the most popular genres. Constant evolution of MMORPGs has also brought along the need to understand how emerging game mechanisms and design choices affect the game data traffic characteristics. This paper presents a network data traffic analysis of Guild Wars 2 (GW2), an MMORPG released in 2012, with the idea to draw a comparison between GW2 and older MMORPGs, the characteristics of which are already known from previous studies, and to provide insight into the network traffic trends in this genre. For GW2 analysis, we use game data traffic collected over five weeks' time in an Internet Service Provider core network. The dataset consists of anonymized packet traces corresponding to 19 players who agreed to their network traffic being captured during gameplay. We analyze traffic characteristics, such as packet size, packet inter-arrival times, throughput, and duration of the playing sessions, along with the participants' basic demographic information and their use of voice communication during game play.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126437965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}