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Impedance considerations for inductive coupling in the EMVCo test environment EMVCo测试环境中电感耦合的阻抗考虑
2015 13th International Conference on Telecommunications (ConTEL) Pub Date : 2015-07-13 DOI: 10.1109/ConTEL.2015.7231210
M. Gebhart
{"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}
引用次数: 0
Estimating real world privacy risk scenarios 评估真实世界的隐私风险场景
2015 13th International Conference on Telecommunications (ConTEL) Pub Date : 2015-07-13 DOI: 10.1109/ConTEL.2015.7231214
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}
引用次数: 2
Delay profiles for indoor diffused visible light communication 室内漫射可见光通信的延迟分布
2015 13th International Conference on Telecommunications (ConTEL) Pub Date : 2015-07-13 DOI: 10.1109/ConTEL.2015.7231193
S. Sheikh Muhammad
{"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}
引用次数: 7
Multi-criteria decision for small cell switch off in ultra-dense LTE networks 超密集LTE网络中小基站关闭的多准则决策
2015 13th International Conference on Telecommunications (ConTEL) Pub Date : 2015-07-13 DOI: 10.1109/ConTEL.2015.7231191
A. Dudnikova, P. Dini, L. Giupponi, D. Panno
{"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}
引用次数: 10
IB-DFE based equalizer for constant envelop OFDM systems 基于IB-DFE的恒包络OFDM系统均衡器
2015 13th International Conference on Telecommunications (ConTEL) Pub Date : 2015-07-13 DOI: 10.1109/ConTEL.2015.7231217
R. Magueta, Adão Silva, R. Dinis, A. Gameiro
{"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}
引用次数: 1
Channel gain and frame error rate for optical street lighting communication 光路照明通信的信道增益和帧误码率
2015 13th International Conference on Telecommunications (ConTEL) Pub Date : 2015-07-13 DOI: 10.1109/ConTEL.2015.7231194
F. Knobloch
{"title":"Channel gain and frame error rate for optical street lighting communication","authors":"F. Knobloch","doi":"10.1109/ConTEL.2015.7231194","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231194","url":null,"abstract":"Visible light communications (VLC) could be used for public street lighting. The paper consists of two parts. A simulation model for direct current (DC) gain analysis with suitable improvements of channel gain and a first trial experiment are elaborated to find possible link configurations for dimming VLC in street lighting. The diffused channel gain is simulated to determine the non-directed optical power loss for a given photo diode. As a result neighbouring receivers detect -72.65 dBm optical power according to the DIN EN 13201 norm and using one BPW34 photo diode. The frame error rate (FER) is measured at different distances and received dimming levels for noncoherent dimming frequency shift On-Off keying (DFSOOK) and UART interface to evaluate the high loss. The FER has a minimum at 50% duty cycle. More effort in transceiver design is required, than in the current configuration, to guarantee a certain dimming range and low FER for street lighting.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"96 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":"123900700","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}
引用次数: 6
Subjective quality assessment of H.265 versus H.264 Video Coding for High-Definition Video Systems 高清视频系统中H.265与H.264视频编码的主观质量评价
2015 13th International Conference on Telecommunications (ConTEL) Pub Date : 2015-07-13 DOI: 10.1109/ConTEL.2015.7231203
E. Dumic, S. Grgic, D. Frank, K. Sakic
{"title":"Subjective quality assessment of H.265 versus H.264 Video Coding for High-Definition Video Systems","authors":"E. Dumic, S. Grgic, D. Frank, K. Sakic","doi":"10.1109/ConTEL.2015.7231203","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231203","url":null,"abstract":"This paper gives our findings on subjective assessment of H.265 versus H.264 Video Coding for High-Definition Video Systems. For the purposes of our research a database consisting of 4 original HD video sequences was prepared with 30 degraded HD video sequences each, with various compression steps both in H.265/HEVC and H.264/AVC. The subjective assessment was conducted in one research laboratory in Croatia. The aim of this paper is to compare results obtained for H.265 versus H.264 Video Coding and to assess the performance of both standards. This assessment will help in the future decision on the coding standard that is going to be used in DVB-T2 networks in Croatia. Additionally, a status of the preparation activities for the allocation of the second digital dividend band in Croatia is given and further developments are described.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"139 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":"122829563","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}
引用次数: 10
Modeling the nonlinearity of polarizing beam splitters in nano-displacement measurement of laser encoder using Jones matrix analysis 利用琼斯矩阵分析对激光编码器纳米位移测量中偏振分束器的非线性进行建模
2015 13th International Conference on Telecommunications (ConTEL) Pub Date : 2015-07-13 DOI: 10.1109/ConTEL.2015.7231188
S. Olyaee, Abdollah Gorgani Firoozjah
{"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}
引用次数: 5
Prototype-driven software development process for augmentative and alternative communication applications 用于增强和替代通信应用的原型驱动软件开发过程
2015 13th International Conference on Telecommunications (ConTEL) Pub Date : 2015-07-13 DOI: 10.1109/ConTEL.2015.7231204
Jurica Babic, Iva Slivar, Z. Car, V. Podobnik
{"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}
引用次数: 8
Trends in evolution of the network traffic of Massively Multiplayer Online Role-Playing Games 大型多人在线角色扮演游戏的网络流量演变趋势
2015 13th International Conference on Telecommunications (ConTEL) Pub Date : 2015-07-13 DOI: 10.1109/ConTEL.2015.7231199
M. Sužnjević, M. Matijasevic
{"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}
引用次数: 0
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