Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249389
B. Bukvic, M. Ilić
We summarize the most important results from the first author's PhD dissertation. We primarily address the improvements in power amplifier circuits. We design, fabricate, and validate a reconfigurable amplifier with PIN diode and a tunable amplifier with a varicap diode. In addition, we present a novel theory about the class-J amplifier design confirming that it can sustain high efficiency over relatively wide frequency band — wider than class-B or class-F amplifiers. Measured results of a novel class-J amplifier verify the proposed theory. In addition, we discuss the benefits and shortcomings of circuit-based and full-wave electromagnetic-based analysis. Finally, we present two switchable circuits, based on graphene controlled by either electric or magnetic polarization.
{"title":"Reconfigurable and tunable efficient power amplifiers for transmitters in telecommunication devices","authors":"B. Bukvic, M. Ilić","doi":"10.1109/TELFOR.2017.8249389","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249389","url":null,"abstract":"We summarize the most important results from the first author's PhD dissertation. We primarily address the improvements in power amplifier circuits. We design, fabricate, and validate a reconfigurable amplifier with PIN diode and a tunable amplifier with a varicap diode. In addition, we present a novel theory about the class-J amplifier design confirming that it can sustain high efficiency over relatively wide frequency band — wider than class-B or class-F amplifiers. Measured results of a novel class-J amplifier verify the proposed theory. In addition, we discuss the benefits and shortcomings of circuit-based and full-wave electromagnetic-based analysis. Finally, we present two switchable circuits, based on graphene controlled by either electric or magnetic polarization.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128008905","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}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249294
T. Devaja, Đorđe Novaković, Živko Bojović
Conteporary lifestyle brings many advantages but also some disadvantages which affect everyday habits of people. Fast lifestyle, lack of free time, everyday exposure to stress situations, exposure to carbon-dioxide/carbon-monoxide as well as tobacco smoke affect the health of people. In this paper we describe the system based on the concept Internet of Things (IoT) which based on calculated Heart Rate Variability (HRV), follows how ambient parameters, read from sensors, affect physical level of sress. The users don't have to go to the medical institution everytime, which implies transportation and waiting in the line for the examination, correction or prescription of the new therapy.
{"title":"Monitoring of HRV parametar in order to detect physical stress","authors":"T. Devaja, Đorđe Novaković, Živko Bojović","doi":"10.1109/TELFOR.2017.8249294","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249294","url":null,"abstract":"Conteporary lifestyle brings many advantages but also some disadvantages which affect everyday habits of people. Fast lifestyle, lack of free time, everyday exposure to stress situations, exposure to carbon-dioxide/carbon-monoxide as well as tobacco smoke affect the health of people. In this paper we describe the system based on the concept Internet of Things (IoT) which based on calculated Heart Rate Variability (HRV), follows how ambient parameters, read from sensors, affect physical level of sress. The users don't have to go to the medical institution everytime, which implies transportation and waiting in the line for the examination, correction or prescription of the new therapy.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129797813","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}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249403
Goran Savic, M. Prokin, V. Rajovic, D. Prokin
In this paper, efficient hardware realization of digital image decoder, has been described. Each block, the proposed image decoder consists of (entropy decoder, decoder probability estimator, dequantizer and inverse subband transformer), has been developed with intention to optimize the hardware architecture and reduce the amount of used logic and memory resources in separate blocks themselves, as well as in the entire image decoder. The proposed realization has been verified by implementation within a low cost FPGA chip.
{"title":"Efficient hardware realization of digital image decoder","authors":"Goran Savic, M. Prokin, V. Rajovic, D. Prokin","doi":"10.1109/TELFOR.2017.8249403","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249403","url":null,"abstract":"In this paper, efficient hardware realization of digital image decoder, has been described. Each block, the proposed image decoder consists of (entropy decoder, decoder probability estimator, dequantizer and inverse subband transformer), has been developed with intention to optimize the hardware architecture and reduce the amount of used logic and memory resources in separate blocks themselves, as well as in the entire image decoder. The proposed realization has been verified by implementation within a low cost FPGA chip.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"14 8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126220784","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}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249315
N. Jevtic, Marija Z. Malnar
Wireless ad hoc networks (WANETs) are one of the most used networks in everyday life. In order to provide users with fast throughput and small delay, many protocols and routing metrics for WANETs are proposed in last decades. The use of computer simulation is a common practice to test performance of the proposed protocols in various network scenarios and to evaluate their significance and practical value. One of the most recent but very frequently used discrete-event network simulator is Network Simulator 3 (NS-3). This paper aims to contribute to the development of NS-3 simulator by proposing an implementation of the most used metric in WANET protocols, the Expected Transmission Count (ETX) within Ad-hoc on demand distance vector (AODV) protocol. The source code of this implementation is publicly available.
{"title":"The NS-3 simulator implementation of ETX metric within AODV protocol","authors":"N. Jevtic, Marija Z. Malnar","doi":"10.1109/TELFOR.2017.8249315","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249315","url":null,"abstract":"Wireless ad hoc networks (WANETs) are one of the most used networks in everyday life. In order to provide users with fast throughput and small delay, many protocols and routing metrics for WANETs are proposed in last decades. The use of computer simulation is a common practice to test performance of the proposed protocols in various network scenarios and to evaluate their significance and practical value. One of the most recent but very frequently used discrete-event network simulator is Network Simulator 3 (NS-3). This paper aims to contribute to the development of NS-3 simulator by proposing an implementation of the most used metric in WANET protocols, the Expected Transmission Count (ETX) within Ad-hoc on demand distance vector (AODV) protocol. The source code of this implementation is publicly available.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128911242","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}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249482
N. Trifunovic, Miloš Kotlar, Ognjen Andrić, Petar Trifunovic, S. Stojanovic, M. Cvetanović, Z. Radivojević, Marija Punt, Nenad Korolija, V. Milutinovic
If a new paradigm is presented before experienced professionals, even if it already demonstrates superiority, the presentation is typically received with resistance. If a new paradigm already demonstrates superiority, and it is presented before students, it is typically received with enthusiasm, especially if tools are available that enable the paradigm to be utilized with a relative ease, and even more if a library of useful examples is at the disposal of new users. Over a period of time, these students grow into experienced professionals who accept the new paradigm, at their new industrial posts, without any resistance. With the above in mind, a series of courses was organized for universities in the USA and Europe, to teach the data flow computing paradigm, using the Maxeler approach as the baseline for practical work. The courses were organized on three different levels: (A) One-hour presentations, followed by another hour about the programming model, and a hands-on hour with tools, (B) A certified full-day short-course that students could use in their transcripts as a diploma supplement, and (C) A one-semester course for 1, 2, or 3 credits that students could use as a graduation requirement. Different presentation levels require different methods of presentation and produce different results in the dissemination domain. These results are here presented for 10 universities in the group A, 10 in the group B, and 10 in the group C. Where appropriate, the findings are backed with statistics data.
{"title":"Experiences in the teaching of a new computing paradigm: DataFlow supercomputing","authors":"N. Trifunovic, Miloš Kotlar, Ognjen Andrić, Petar Trifunovic, S. Stojanovic, M. Cvetanović, Z. Radivojević, Marija Punt, Nenad Korolija, V. Milutinovic","doi":"10.1109/TELFOR.2017.8249482","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249482","url":null,"abstract":"If a new paradigm is presented before experienced professionals, even if it already demonstrates superiority, the presentation is typically received with resistance. If a new paradigm already demonstrates superiority, and it is presented before students, it is typically received with enthusiasm, especially if tools are available that enable the paradigm to be utilized with a relative ease, and even more if a library of useful examples is at the disposal of new users. Over a period of time, these students grow into experienced professionals who accept the new paradigm, at their new industrial posts, without any resistance. With the above in mind, a series of courses was organized for universities in the USA and Europe, to teach the data flow computing paradigm, using the Maxeler approach as the baseline for practical work. The courses were organized on three different levels: (A) One-hour presentations, followed by another hour about the programming model, and a hands-on hour with tools, (B) A certified full-day short-course that students could use in their transcripts as a diploma supplement, and (C) A one-semester course for 1, 2, or 3 credits that students could use as a graduation requirement. Different presentation levels require different methods of presentation and produce different results in the dissemination domain. These results are here presented for 10 universities in the group A, 10 in the group B, and 10 in the group C. Where appropriate, the findings are backed with statistics data.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124221645","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}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249451
Đorđe Petrović, Ilja Stanišević
Data are omnipresent on the Internet. Searching the web for useful data and information has become a routine job. The data on the sites can be found in tables, articles, comments, nested in different HTML tags, etc. Gathering a large amount of data from the web is not an easy task, but it is a good way to collect information which can be used in further analyzes. In this paper we will deal with the process of web scraping data from different locations on the Internet and their storage in a database, for the purpose of collecting and analyzing data of the used cars market.
{"title":"Web scrapping and storing data in a database, a case study of the used cars market","authors":"Đorđe Petrović, Ilja Stanišević","doi":"10.1109/TELFOR.2017.8249451","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249451","url":null,"abstract":"Data are omnipresent on the Internet. Searching the web for useful data and information has become a routine job. The data on the sites can be found in tables, articles, comments, nested in different HTML tags, etc. Gathering a large amount of data from the web is not an easy task, but it is a good way to collect information which can be used in further analyzes. In this paper we will deal with the process of web scraping data from different locations on the Internet and their storage in a database, for the purpose of collecting and analyzing data of the used cars market.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"17 24","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120853357","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}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249309
M. Mileusnic, P. Petrovic, B. Pavić, V. Marinković-Nedelicki, Jovica Glišović, A. Lebl, I. Marjanović
This paper presents the radio jammer for protection of VIP person, manpower and material resources against remotely controlled improvised explosive devices. The jammer is completely the result of domestic development in the Institute IRITEL. According to its performances, the jammer is comparable with similar devices that exist in the world. The presented technical solution is flexible, so that new features and operation modes are easy to develop for the purpose of further device improvement.
{"title":"The radio jammer against remote controlled improvised explosive devices","authors":"M. Mileusnic, P. Petrovic, B. Pavić, V. Marinković-Nedelicki, Jovica Glišović, A. Lebl, I. Marjanović","doi":"10.1109/TELFOR.2017.8249309","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249309","url":null,"abstract":"This paper presents the radio jammer for protection of VIP person, manpower and material resources against remotely controlled improvised explosive devices. The jammer is completely the result of domestic development in the Institute IRITEL. According to its performances, the jammer is comparable with similar devices that exist in the world. The presented technical solution is flexible, so that new features and operation modes are easy to develop for the purpose of further device improvement.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115184066","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}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249338
Frank Senf, B. Nikolić, B. Dimitrijevic, Silvia Krug, T. Hutschenreuther, H. Toepfer
Battery-powered sensor nodes are available for various monitoring tasks. Among these, cargo trains pose some special challenges on both the nodes as well as the communication due to the harsh environmental conditions. In this paper, we present insight on propagation conditions in train scenarios based on theoretical simulations and real-world measurements and finally discuss options to achieve robust and reliable communication under the observed conditions. The discussion also includes requirements regarding quality of service and energy-efficiency.
{"title":"Towards robust communication-based object monitoring under harsh propagation conditions","authors":"Frank Senf, B. Nikolić, B. Dimitrijevic, Silvia Krug, T. Hutschenreuther, H. Toepfer","doi":"10.1109/TELFOR.2017.8249338","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249338","url":null,"abstract":"Battery-powered sensor nodes are available for various monitoring tasks. Among these, cargo trains pose some special challenges on both the nodes as well as the communication due to the harsh environmental conditions. In this paper, we present insight on propagation conditions in train scenarios based on theoretical simulations and real-world measurements and finally discuss options to achieve robust and reliable communication under the observed conditions. The discussion also includes requirements regarding quality of service and energy-efficiency.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131159538","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}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249402
B. Florea
Smartphones have changed the way people communicate and interact with each other; they have provided mobile internet access available almost everywhere and they replaced individual devices for storing and listening to music, photo camera and even GPS navigation. Today, these devices have a huge processing power, available even in lower end models, but they are used mainly to communicate and interact between people. This paper proposes a method for smartphones and tablets to communicate and interact with other devices, which are not necessarily connected to the internet. In order to achieve this, an input/output (I/O) board is proposed, which enables the smartphone to replace the standard microcontroller used in most automation and Internet of Things (IoT) applications.
{"title":"Smartphone input/output interface for IoT applications","authors":"B. Florea","doi":"10.1109/TELFOR.2017.8249402","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249402","url":null,"abstract":"Smartphones have changed the way people communicate and interact with each other; they have provided mobile internet access available almost everywhere and they replaced individual devices for storing and listening to music, photo camera and even GPS navigation. Today, these devices have a huge processing power, available even in lower end models, but they are used mainly to communicate and interact between people. This paper proposes a method for smartphones and tablets to communicate and interact with other devices, which are not necessarily connected to the internet. In order to achieve this, an input/output (I/O) board is proposed, which enables the smartphone to replace the standard microcontroller used in most automation and Internet of Things (IoT) applications.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126886229","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}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249312
A. Faye, J. Ndaw, A. S. Maiga
Conventional DOA estimation techniques use planar arrays to determine both azimuth and elevation angles due to angle ambiguity resulting in ULA radiation pattern symmetry. This paper demonstrates the ability of a single Uniform Linear Array (ULA) of isotropic elements along with an Artificial Neural Networks (ANN) approach to achieve two-dimensional direction of arrival (2D-DOA) estimation. A single linear array combined with appropriately trained Linear Vector Quantization (LVQ) Artificial Neural Networks is used to achieve two-dimensional direction of arrival (2D-DOA) estimation with elevation and azimuth angles estimations. Linear Vector Quantization (LVQ) neural networks are sequentially trained on elevation and azimuth dependent datasets build from received signal in predefined spatial sectors chosen in accordance with pattern symmetry and radiation intensity. A multilevel process is applied to further reduce the training sets sizes and computation time. System performances are in good agreement with subspace based techniques.
{"title":"Two-dimensional DOA estimation based on a single Uniform linear array","authors":"A. Faye, J. Ndaw, A. S. Maiga","doi":"10.1109/TELFOR.2017.8249312","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249312","url":null,"abstract":"Conventional DOA estimation techniques use planar arrays to determine both azimuth and elevation angles due to angle ambiguity resulting in ULA radiation pattern symmetry. This paper demonstrates the ability of a single Uniform Linear Array (ULA) of isotropic elements along with an Artificial Neural Networks (ANN) approach to achieve two-dimensional direction of arrival (2D-DOA) estimation. A single linear array combined with appropriately trained Linear Vector Quantization (LVQ) Artificial Neural Networks is used to achieve two-dimensional direction of arrival (2D-DOA) estimation with elevation and azimuth angles estimations. Linear Vector Quantization (LVQ) neural networks are sequentially trained on elevation and azimuth dependent datasets build from received signal in predefined spatial sectors chosen in accordance with pattern symmetry and radiation intensity. A multilevel process is applied to further reduce the training sets sizes and computation time. System performances are in good agreement with subspace based techniques.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122914808","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}
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