Pub Date : 2013-10-01DOI: 10.1109/TELSKS.2013.6704448
Jasna D. Marković-Petrović, M. Stojanović
Several factors have contributed to the escalation of risks specific to novel control systems, including the network architecture, adoption of standardized technologies with known vulnerabilities and connectivity of control systems to other networks. This paper considers SCADA (Supervisory Control And Data Acquisition) system vulnerabilities as well as securing the infrastructure of power utility information-telecommunication systems. We first present a concept of SCADA architecture in the hydropower plants. The simulation model assumes Distributed Denial of Service (DDoS) attack to SCADA system. A comprehensive simulation points to SCADA performance deterioration under DDoS attack. Possible security solutions have also been discussed.
有几个因素导致了新型控制系统特有的风险升级，包括网络架构、采用具有已知漏洞的标准化技术以及控制系统与其他网络的连接。本文考虑了SCADA (Supervisory Control And Data Acquisition，监控与数据采集)系统的脆弱性，以及保障电力企业信息通信系统基础设施的安全。我们首先提出了水电站SCADA体系结构的概念。仿真模型假设SCADA系统受到分布式拒绝服务(DDoS)攻击。综合仿真表明，在DDoS攻击下SCADA的性能会下降。还讨论了可能的安全解决方案。
{"title":"Analysis of SCADA system vulnerabilities to DDoS attacks","authors":"Jasna D. Marković-Petrović, M. Stojanović","doi":"10.1109/TELSKS.2013.6704448","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704448","url":null,"abstract":"Several factors have contributed to the escalation of risks specific to novel control systems, including the network architecture, adoption of standardized technologies with known vulnerabilities and connectivity of control systems to other networks. This paper considers SCADA (Supervisory Control And Data Acquisition) system vulnerabilities as well as securing the infrastructure of power utility information-telecommunication systems. We first present a concept of SCADA architecture in the hydropower plants. The simulation model assumes Distributed Denial of Service (DDoS) attack to SCADA system. A comprehensive simulation points to SCADA performance deterioration under DDoS attack. Possible security solutions have also been discussed.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132689858","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704434
Nikola Sobajic, J. Gutiérrez, R. Kraemer, M. Krstic
We present a feasibility study for a wake-up receiver of a small mobile tag that can be fitted on a bird and used to communicate with the International Space Station (ISS). The results show that implementing such a wake-up receiver with a significant link margin of 31 dB is possible using a superheterodyne rake receiver with a low power consumption.
{"title":"Using wake-up receivers in bird telemetry - Viability study","authors":"Nikola Sobajic, J. Gutiérrez, R. Kraemer, M. Krstic","doi":"10.1109/TELSKS.2013.6704434","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704434","url":null,"abstract":"We present a feasibility study for a wake-up receiver of a small mobile tag that can be fitted on a bird and used to communicate with the International Space Station (ISS). The results show that implementing such a wake-up receiver with a significant link margin of 31 dB is possible using a superheterodyne rake receiver with a low power consumption.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128237577","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704893
E. Milovanovic, I. Milovanovic, M. Stojcev
In this paper we consider the implementation of parallel test patterns generation which is used as a basic building block in built-in-self test (BIST) design. The proposed design can drive several circuits under test (CUT) within a complex VLSI IC. For parallel test pattern generation a LFSR of Galois type is used. Mathematical procedure for concurrent pseudo random number (PRN) generation is described. We have implemented a LFSR that generates two PRNs in parallel. The achieved speed up is between 1.33 and 2, and depends on the characteristics of used primitive polynomial.
{"title":"Concurrent generation of pseudo random numbers with LFSR of Galois type","authors":"E. Milovanovic, I. Milovanovic, M. Stojcev","doi":"10.1109/TELSKS.2013.6704893","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704893","url":null,"abstract":"In this paper we consider the implementation of parallel test patterns generation which is used as a basic building block in built-in-self test (BIST) design. The proposed design can drive several circuits under test (CUT) within a complex VLSI IC. For parallel test pattern generation a LFSR of Galois type is used. Mathematical procedure for concurrent pseudo random number (PRN) generation is described. We have implemented a LFSR that generates two PRNs in parallel. The achieved speed up is between 1.33 and 2, and depends on the characteristics of used primitive polynomial.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"119 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129313036","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704430
Ž. Mančić, V. Petrovic
The paper presents the calculation of the effective relative permittivity and the characteristic impedance of the shielded microstrip line with bi-isotropic dielectric substrate, and with the special kind of the bi-isotropic substrate - the Tellegen material. Calculation was performed using the strong formulation of the Finite Element method (FEM). Basis functions of the third order and rectangle mesh were applied.
{"title":"Quasi-static analysis of the shielded microstrip line with bi-isotropic substrate by the strong FEM formulation","authors":"Ž. Mančić, V. Petrovic","doi":"10.1109/TELSKS.2013.6704430","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704430","url":null,"abstract":"The paper presents the calculation of the effective relative permittivity and the characteristic impedance of the shielded microstrip line with bi-isotropic dielectric substrate, and with the special kind of the bi-isotropic substrate - the Tellegen material. Calculation was performed using the strong formulation of the Finite Element method (FEM). Basis functions of the third order and rectangle mesh were applied.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129835881","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704930
V. Radonić, V. Crnojević-Bengin
In this paper, a compact multilayer dual-band and tri-band filters based on grounded spiral resonators are proposed. The filters are realized on two stacked substrates: Taconic CeR-10 substrate and Kapton foil, where the feeds are positioned in the upper layer whereas resonators are placed in the middle layer between feed lines and the ground. The proposed dual-band filter operates at 0.68/0.82 GHz while tri-band filter, realized using addition quarter-wavelength resonators, operates at 0.634/0.81/1.1 GHz. Specific geometrical arrangement of the resonators result in three transmission zeros providing high selectivity of the passbands and high suppression out of the passband up to the second harmonics.
{"title":"Compact multilayer dual-band and tri-band bandpass filters using grounded spiral resonators","authors":"V. Radonić, V. Crnojević-Bengin","doi":"10.1109/TELSKS.2013.6704930","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704930","url":null,"abstract":"In this paper, a compact multilayer dual-band and tri-band filters based on grounded spiral resonators are proposed. The filters are realized on two stacked substrates: Taconic CeR-10 substrate and Kapton foil, where the feeds are positioned in the upper layer whereas resonators are placed in the middle layer between feed lines and the ground. The proposed dual-band filter operates at 0.68/0.82 GHz while tri-band filter, realized using addition quarter-wavelength resonators, operates at 0.634/0.81/1.1 GHz. Specific geometrical arrangement of the resonators result in three transmission zeros providing high selectivity of the passbands and high suppression out of the passband up to the second harmonics.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130563733","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704890
V. Javor
Electromagnetic field of powerful MF transmitters induces currents in large-scale conductive structures which act as unintentional receiving antennas. Among such structures are construction cranes, tower cranes, portal-harbour cranes and reloading bridges, so that touch voltages and short-cut currents are experienced by their workers. Calculations are presented in this paper for cranes treated as wire antenna structures in plane-wave electromagnetic field of some frequency and propagation direction, using Point matching method for solving the system of electric field integro-differential equations (EFIE) of Hallen's type with current distributions approximated by polynomials. Possible solutions of this problem are given in the paper.
{"title":"Induced currents in cranes in electromagnetic field of MF transmitters","authors":"V. Javor","doi":"10.1109/TELSKS.2013.6704890","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704890","url":null,"abstract":"Electromagnetic field of powerful MF transmitters induces currents in large-scale conductive structures which act as unintentional receiving antennas. Among such structures are construction cranes, tower cranes, portal-harbour cranes and reloading bridges, so that touch voltages and short-cut currents are experienced by their workers. Calculations are presented in this paper for cranes treated as wire antenna structures in plane-wave electromagnetic field of some frequency and propagation direction, using Point matching method for solving the system of electric field integro-differential equations (EFIE) of Hallen's type with current distributions approximated by polynomials. Possible solutions of this problem are given in the paper.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130258229","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704458
Ugljesa Jovanovic, Igor Jovanović, A. Petrušić, Z. Petrusic, D. Mančić
In this paper a prototype of wireless system for dust density measurement is presented. The system is developed with inexpensive commercially available components and can measure dust density up to 0.5mg/m3. The system is modular and consists of a base station connected to a PC via USB communication and an autonomous sensing node equipped with an optical dust sensor GP2Y1010AU0F. A virtual instrument made in LabVIEW is created to monitor the system operation, data acquisition and data storage.
{"title":"Low-cost wireless dust monitoring system","authors":"Ugljesa Jovanovic, Igor Jovanović, A. Petrušić, Z. Petrusic, D. Mančić","doi":"10.1109/TELSKS.2013.6704458","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704458","url":null,"abstract":"In this paper a prototype of wireless system for dust density measurement is presented. The system is developed with inexpensive commercially available components and can measure dust density up to 0.5mg/m3. The system is modular and consists of a base station connected to a PC via USB communication and an autonomous sensing node equipped with an optical dust sensor GP2Y1010AU0F. A virtual instrument made in LabVIEW is created to monitor the system operation, data acquisition and data storage.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130549395","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704914
D. Dupleich, Michael Grimm, Florian Schlembach, R. Thoma
This paper addresses the mitigation of non-linearly induced interference in reconfigurable wideband direct down-conversion receivers using digital signal processing techniques. Multi-mode and multi-band transceivers are widely used nowadays. However, due to their aim to be flexible and reconfigurable, they lack of high selectivity and are more sensitive to non-linear distortions beside other RF impairments. The case of blocking through out of band interferer signals is found in practice, where the receiver tries to demodulate a weak signal from a far base station, but a high power wideband signal from a near base station in a different frequency-slot induces the receiver to work in a non-linear region. The spectral regrowth of the interferer signal that falls above the desired one deteriorates the bit error rate performance. In the receiver, the automatic gain control attenuates the interferer, but also reduces the power of the desired signal, thereby decreasing the dynamic range of the receiver. A feedforward algorithm based on a reference model and adaptive filters has been analysed under fading channel conditions in MATLAB and later tested in the lab in a realtime implementation in the FPGA of a software-defined radio device. Results show an enhancement in the bit error rate by reducing the interference and an increase in the dynamic range of the receiver.
{"title":"Practical aspects of a digital feedforward approach for mitigating non-linear distortions in receivers","authors":"D. Dupleich, Michael Grimm, Florian Schlembach, R. Thoma","doi":"10.1109/TELSKS.2013.6704914","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704914","url":null,"abstract":"This paper addresses the mitigation of non-linearly induced interference in reconfigurable wideband direct down-conversion receivers using digital signal processing techniques. Multi-mode and multi-band transceivers are widely used nowadays. However, due to their aim to be flexible and reconfigurable, they lack of high selectivity and are more sensitive to non-linear distortions beside other RF impairments. The case of blocking through out of band interferer signals is found in practice, where the receiver tries to demodulate a weak signal from a far base station, but a high power wideband signal from a near base station in a different frequency-slot induces the receiver to work in a non-linear region. The spectral regrowth of the interferer signal that falls above the desired one deteriorates the bit error rate performance. In the receiver, the automatic gain control attenuates the interferer, but also reduces the power of the desired signal, thereby decreasing the dynamic range of the receiver. A feedforward algorithm based on a reference model and adaptive filters has been analysed under fading channel conditions in MATLAB and later tested in the lab in a realtime implementation in the FPGA of a software-defined radio device. Results show an enhancement in the bit error rate by reducing the interference and an increase in the dynamic range of the receiver.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129755702","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704934
J. Brendel, S. Riess, R. Weigel, G. Fischer
Since several years, `cognitive radio' is given much attention in research and is seen as a future technology in communications. In this paper a cognitive radio system for Program Making and Special Event (PMSE) devices (e.g. wireless microphones) is presented and the results of a field test are discussed. First, we outline the challenges which the PMSE industry has to cope with and how changes in regulatory and the digital dividend in the TV UHF band has impact on the operation reliability of PMSE devices. Afterwards, a system is presented that uses cognitive radio techniques to ensure the high audio quality requirements and interference free operation of PMSE devices under the previously mentioned circumstances. Beside a general overview over the developed system we focus on a distributed spectrum sensing network as part of the cognitive information acquisition to monitor the current spectrum situation. The data is used by the cognitive engine to detect potential interferers and to trigger operation parameter changes (e.g. frequency or transmit power) of the PMSE devices to avoid link quality degradation. We present the built-up sensor nodes for the spectrum measurement and the developed software to control the sensor nodes and to preprocess the measured data. Finally, the results, collected with the field test platform in the fair-ground of Berlin, show convincingly how the developed cognitive system makes PMSE devices future-proof.
{"title":"A cognitive system for future-proof wireless microphones: Concept, implementation and results","authors":"J. Brendel, S. Riess, R. Weigel, G. Fischer","doi":"10.1109/TELSKS.2013.6704934","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704934","url":null,"abstract":"Since several years, `cognitive radio' is given much attention in research and is seen as a future technology in communications. In this paper a cognitive radio system for Program Making and Special Event (PMSE) devices (e.g. wireless microphones) is presented and the results of a field test are discussed. First, we outline the challenges which the PMSE industry has to cope with and how changes in regulatory and the digital dividend in the TV UHF band has impact on the operation reliability of PMSE devices. Afterwards, a system is presented that uses cognitive radio techniques to ensure the high audio quality requirements and interference free operation of PMSE devices under the previously mentioned circumstances. Beside a general overview over the developed system we focus on a distributed spectrum sensing network as part of the cognitive information acquisition to monitor the current spectrum situation. The data is used by the cognitive engine to detect potential interferers and to trigger operation parameter changes (e.g. frequency or transmit power) of the PMSE devices to avoid link quality degradation. We present the built-up sensor nodes for the spectrum measurement and the developed software to control the sensor nodes and to preprocess the measured data. Finally, the results, collected with the field test platform in the fair-ground of Berlin, show convincingly how the developed cognitive system makes PMSE devices future-proof.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127775336","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704907
A. Kostić-Ljubisavljević, M. Jankovic, Ljiljana Matavulj, N. Mitić
The paper deals with the role of Retail-Minus method in control of the wholesale prices in the broadband market in the Republic of Serbia. In telecom market of Republic of Serbia the dominant method arranged is cost-based pricing. However, years of experience of other countries has shown that the Retail-Minus method is precisely useful test for determining primarily the extent to which these prices should change and that this method combined with the cost based model can be very useful tool for price control by the regulator. The ultimate goal of this control is to encourage healthy competition between operators in this monopolized wholesale market, or a market where there is an operator with significant market power (SMP operator).
{"title":"Application of the Retail-Minus on price regulation in wholesale market of electronic communications","authors":"A. Kostić-Ljubisavljević, M. Jankovic, Ljiljana Matavulj, N. Mitić","doi":"10.1109/TELSKS.2013.6704907","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704907","url":null,"abstract":"The paper deals with the role of Retail-Minus method in control of the wholesale prices in the broadband market in the Republic of Serbia. In telecom market of Republic of Serbia the dominant method arranged is cost-based pricing. However, years of experience of other countries has shown that the Retail-Minus method is precisely useful test for determining primarily the extent to which these prices should change and that this method combined with the cost based model can be very useful tool for price control by the regulator. The ultimate goal of this control is to encourage healthy competition between operators in this monopolized wholesale market, or a market where there is an operator with significant market power (SMP operator).","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124927752","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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