Pub Date : 2013-10-01DOI: 10.1109/TELSKS.2013.6704403
J. Radic, A. Djugova, L. Nagy, Mirjana S. Videnovic Misic
A low-power tuneable impulse radio ultra wide band (IR-UWB) pulse generator (PG) for 3.1 - 6.65 GHz band applications is proposed. To provide compensation due to process, voltage and temperature (PVT) variations and achievement of best performance, the PG is capable of adjusting the Power Spectral Density (PSD) modifying the generated pulse amplitude and duration. Furthermore, the spectrum center frequency can be tuned by changing the frequency of the voltage controlled ring oscillator. Post-layout simulations show the pulse amplitude of 315 mV and the pulse duration around 1 ns. The generated signal spectrum fully complies with the FCC spectral regulations. The total power consumption is only 933 μW with supply voltage of 1.8 V. This corresponds to energy consumption of 11.67 pJ/pulse for a 80 MHz pulse repetition frequency (PRF). The PG is designed in UMC 0.18μm CMOS process with the total chip area of 0.35 μm2.
{"title":"A 3.1 – 6.65 GHz, 933µW impulse radio pulse generator with tuneable spectrum in 0.18µm CMOS","authors":"J. Radic, A. Djugova, L. Nagy, Mirjana S. Videnovic Misic","doi":"10.1109/TELSKS.2013.6704403","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704403","url":null,"abstract":"A low-power tuneable impulse radio ultra wide band (IR-UWB) pulse generator (PG) for 3.1 - 6.65 GHz band applications is proposed. To provide compensation due to process, voltage and temperature (PVT) variations and achievement of best performance, the PG is capable of adjusting the Power Spectral Density (PSD) modifying the generated pulse amplitude and duration. Furthermore, the spectrum center frequency can be tuned by changing the frequency of the voltage controlled ring oscillator. Post-layout simulations show the pulse amplitude of 315 mV and the pulse duration around 1 ns. The generated signal spectrum fully complies with the FCC spectral regulations. The total power consumption is only 933 μW with supply voltage of 1.8 V. This corresponds to energy consumption of 11.67 pJ/pulse for a 80 MHz pulse repetition frequency (PRF). The PG is designed in UMC 0.18μm CMOS process with the total chip area of 0.35 μm2.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"16 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":"121494523","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.2013.6704455
D. Vujić
Interest in mobile broadband and ubiquitous usage of mobile phones in all areas, especially in closed venues requires a new approach in designing radio access mobile networks. A new approach that requires planning from “indoor to outdoor” has been proposed and appropriate examples have been given to demonstrate the difference to standard planning of indoor coverage.
{"title":"On indoor to outdoor radio access network planning in mobile systems","authors":"D. Vujić","doi":"10.1109/TELSKS.2013.6704455","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704455","url":null,"abstract":"Interest in mobile broadband and ubiquitous usage of mobile phones in all areas, especially in closed venues requires a new approach in designing radio access mobile networks. A new approach that requires planning from “indoor to outdoor” has been proposed and appropriate examples have been given to demonstrate the difference to standard planning of indoor coverage.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"33 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":"126257915","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.2013.6704437
J. Djordjevic-Kozarov, V. Pavlovic
The paper presents detailed analysis of the size of pass-band and stop-band of multiplierless linear-phase 2D FIR filter function with diamond sharpness spike. Normalized surface area of the filter function pass-band is 8,148153 × 10-5 for given maximal attenuation of 0,28 dB. Normalized surface area of the filter function stop-band is 98,6931156 % for the given minimal attenuation of 100 dB.
{"title":"Size analysis surface area of the pass-band and stopband of multiplierless 2D FIR filter","authors":"J. Djordjevic-Kozarov, V. Pavlovic","doi":"10.1109/TELSKS.2013.6704437","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704437","url":null,"abstract":"The paper presents detailed analysis of the size of pass-band and stop-band of multiplierless linear-phase 2D FIR filter function with diamond sharpness spike. Normalized surface area of the filter function pass-band is 8,148153 × 10-5 for given maximal attenuation of 0,28 dB. Normalized surface area of the filter function stop-band is 98,6931156 % for the given minimal attenuation of 100 dB.","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":"116441956","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.2013.6704431
M. Milijić, A. Nesic, B. Milovanovic
Side lobe suppression of printed antenna arrays with perpendicular reflector has been analyzed in this article. The arrays are with pentagonal dipoles as radiating elements operating at a second resonance. The used distribution is chosen to enable high side lobe suppressions bigger than 41.5 dB at the frequency of 12 GHz. The feeding network in symmetrical (balanced) microstrip technique with impedance transformers is presented too. The antenna arrays with the high side lobe suppression are very sensitive in small deviation of distribution coefficients from ideal that can results in decreasing SLS values. Therefore, the optimal feeding network with minimal departure from determined distribution is investigated.
{"title":"Side lobe suppression of printed antenna array with perpendicular reflector","authors":"M. Milijić, A. Nesic, B. Milovanovic","doi":"10.1109/TELSKS.2013.6704431","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704431","url":null,"abstract":"Side lobe suppression of printed antenna arrays with perpendicular reflector has been analyzed in this article. The arrays are with pentagonal dipoles as radiating elements operating at a second resonance. The used distribution is chosen to enable high side lobe suppressions bigger than 41.5 dB at the frequency of 12 GHz. The feeding network in symmetrical (balanced) microstrip technique with impedance transformers is presented too. The antenna arrays with the high side lobe suppression are very sensitive in small deviation of distribution coefficients from ideal that can results in decreasing SLS values. Therefore, the optimal feeding network with minimal departure from determined distribution is investigated.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"2 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":"130337449","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.2013.6704912
E. Popovici, Ovidiu G. Guta, Liviu A. Stancu, Stefan Arseni, O. Fratu
In this paper we introduce a continuous authentication system based on keystroke dynamics (BIOMETRIC). We also propose two algorithms for extracting patterns and validating the user, both intended to be used in the same time to improve the overall performance of the validation process. The first one is based on a Multi Layer Perceptron (MLP) Neural Network and the second one relies on a trust algorithm that uses the Bhattacharyya coefficient.
{"title":"MLP neural network for keystroke-based user identification system","authors":"E. Popovici, Ovidiu G. Guta, Liviu A. Stancu, Stefan Arseni, O. Fratu","doi":"10.1109/TELSKS.2013.6704912","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704912","url":null,"abstract":"In this paper we introduce a continuous authentication system based on keystroke dynamics (BIOMETRIC). We also propose two algorithms for extracting patterns and validating the user, both intended to be used in the same time to improve the overall performance of the validation process. The first one is based on a Multi Layer Perceptron (MLP) Neural Network and the second one relies on a trust algorithm that uses the Bhattacharyya coefficient.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"105 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":"116432603","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.2013.6704925
Bojan R. Ignjatovic, Bojan B. Andjelinic, Mirjana Simić
This paper investigates impact of the mobile user orientation on positioning accuracy in indoor environment using WLAN technology. Positioning methods focused in the experimental analysis are the Cell-ID method and the space segmentation methods. Both methods assign the mobile terminal with unknown location coordinates based upon the access point with the strongest signal. In this paper, the methods are described, experimental analysis is performed and the results are presented, and conclusions are derived regarding effects of the mobile user orientation on positioning accuracy.
{"title":"Impact of the user orientation on WLAN positioning based upon the access point with the strongest signal","authors":"Bojan R. Ignjatovic, Bojan B. Andjelinic, Mirjana Simić","doi":"10.1109/TELSKS.2013.6704925","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704925","url":null,"abstract":"This paper investigates impact of the mobile user orientation on positioning accuracy in indoor environment using WLAN technology. Positioning methods focused in the experimental analysis are the Cell-ID method and the space segmentation methods. Both methods assign the mobile terminal with unknown location coordinates based upon the access point with the strongest signal. In this paper, the methods are described, experimental analysis is performed and the results are presented, and conclusions are derived regarding effects of the mobile user orientation on positioning accuracy.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"10 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":"133361555","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.2013.6704936
B. Mrazovac, B. Todorović, M. Bjelica, Dragan D. Kukolj
The presence of a human in the vicinity of radio transceivers results in radio signal strength variations at the receiver's input. Therefore, human presence in an indoor environment can be recognized by analyzing and quantifying irregularities in the radio signature. In order to quantify the information in terms of human presence, we present a novel human presence detection method based on information entropy extracted from a sequence of received signal strength samples. As opposed to existing smart home solutions that incorporate a complex set of sensors for human detection, the proposed method is solely based on radio irregularity phenomenon, without modifying the original environment. An additional level of sensor intelligence is introduced without sensors and installation costs, or specific training procedures for end-consumers.
{"title":"Reaching the next level of indoor human presence detection: An RF based solution","authors":"B. Mrazovac, B. Todorović, M. Bjelica, Dragan D. Kukolj","doi":"10.1109/TELSKS.2013.6704936","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704936","url":null,"abstract":"The presence of a human in the vicinity of radio transceivers results in radio signal strength variations at the receiver's input. Therefore, human presence in an indoor environment can be recognized by analyzing and quantifying irregularities in the radio signature. In order to quantify the information in terms of human presence, we present a novel human presence detection method based on information entropy extracted from a sequence of received signal strength samples. As opposed to existing smart home solutions that incorporate a complex set of sensors for human detection, the proposed method is solely based on radio irregularity phenomenon, without modifying the original environment. An additional level of sensor intelligence is introduced without sensors and installation costs, or specific training procedures for end-consumers.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"15 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":"132220044","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.2013.6704935
L. Gavrilovska, V. Atanasovski
Radio Environment Maps (REM) are lately emerging as a technical enabler and facilitator of dynamic spectrum access and cognitive radio scenarios. Their usage fosters many operational wireless network procedures such as spectrum access, spectrum sharing, resource usage optimization etc. Additionally, REMs are foreseen as a supplementary tool for regulation of spectrum usage. This paper covers both theoretical and practical aspects of efficient REM system design and REM construction in general. It showcases the synergy between spectrum sensing techniques and geolocation database approaches towards accurate and up-to-date radio field estimation. Furthermore, the paper provides details on recent research advances in the area of REM construction, Radio Interference Fields (RIF) derivation, source localization and propagation modelling. Finally, it analyzes several use-cases of practical implementation of REMs proving its capabilities to serve as an enabler for flexible spectrum management in future wireless networks.
{"title":"Dynamic REM towards flexible spectrum management","authors":"L. Gavrilovska, V. Atanasovski","doi":"10.1109/TELSKS.2013.6704935","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704935","url":null,"abstract":"Radio Environment Maps (REM) are lately emerging as a technical enabler and facilitator of dynamic spectrum access and cognitive radio scenarios. Their usage fosters many operational wireless network procedures such as spectrum access, spectrum sharing, resource usage optimization etc. Additionally, REMs are foreseen as a supplementary tool for regulation of spectrum usage. This paper covers both theoretical and practical aspects of efficient REM system design and REM construction in general. It showcases the synergy between spectrum sensing techniques and geolocation database approaches towards accurate and up-to-date radio field estimation. Furthermore, the paper provides details on recent research advances in the area of REM construction, Radio Interference Fields (RIF) derivation, source localization and propagation modelling. Finally, it analyzes several use-cases of practical implementation of REMs proving its capabilities to serve as an enabler for flexible spectrum management in future wireless networks.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"2 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":"114035325","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.2013.6704900
D. Milovanovic, Z. Miličević, Z. Bojkovic
The coding efficiency of three generations of video coding standards is compared by means of PSNR and subjective testing results. A unified approach is applied to the analysis of designs of MPEG-H HEVC, H.264/MPEG-4 AVC, and H.262/MPEG-2 Video reference implementation. The results of subjective tests for selected HD format sequences indicate that HEVC encoders can achieve equivalent subjective broadcast quality as encoders that conform to AVC when using approximately 50% less bit rate on average. Bitrate reduction based on PSNR and complexity based on encoding/decoding time of HM8 MP vs. AVC HP vs. MPEG-2 MP are tested at bitrates of 2, 3, 4.5, 7 and 10 Mbit/s using the encoding constraints typical for broadcasting applications.
通过PSNR和主观测试结果比较了三代视频编码标准的编码效率。采用统一的方法分析了MPEG-H HEVC、H.264/MPEG-4 AVC和H.262/MPEG-2视频参考实现的设计。对选定的HD格式序列的主观测试结果表明，HEVC编码器在平均使用约50%的比特率时，可以达到与符合AVC的编码器相当的主观广播质量。基于PSNR的比特率降低和基于编码/解码时间的复杂性HM8 MP vs. AVC HP vs. MPEG-2 MP在2,3,4.5,7和10mbit /s的比特率下使用广播应用的典型编码约束进行了测试。
{"title":"MPEG video deployment in digital television: HEVC vs. AVC codec performance study","authors":"D. Milovanovic, Z. Miličević, Z. Bojkovic","doi":"10.1109/TELSKS.2013.6704900","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704900","url":null,"abstract":"The coding efficiency of three generations of video coding standards is compared by means of PSNR and subjective testing results. A unified approach is applied to the analysis of designs of MPEG-H HEVC, H.264/MPEG-4 AVC, and H.262/MPEG-2 Video reference implementation. The results of subjective tests for selected HD format sequences indicate that HEVC encoders can achieve equivalent subjective broadcast quality as encoders that conform to AVC when using approximately 50% less bit rate on average. Bitrate reduction based on PSNR and complexity based on encoding/decoding time of HM8 MP vs. AVC HP vs. MPEG-2 MP are tested at bitrates of 2, 3, 4.5, 7 and 10 Mbit/s using the encoding constraints typical for broadcasting applications.","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":"125822930","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.2013.6704926
S. Tatu, K. Wu
A short review of the six-port theory for usual applications in down-conversion, direct modulation, and direction finding techniques is presented in this paper. Implementations of the circuit in various mature fabrication technologies, covering millimeter wave frequencies up to 94 GHz, are exemplified. Circuit characterisation method using a precision network analyser and on-wafer measurements are described in details. Measurement results of various passive circuits, from a novel power-divider to a 60 GHz six-port circuit, are discussed, validating very good S-parameter and qi point performances. System measurements, using a six-port front-end imbedded in 77 GHz heterodyne FMCW radar, conclude the paper.
{"title":"Six-port technology and applications","authors":"S. Tatu, K. Wu","doi":"10.1109/TELSKS.2013.6704926","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704926","url":null,"abstract":"A short review of the six-port theory for usual applications in down-conversion, direct modulation, and direction finding techniques is presented in this paper. Implementations of the circuit in various mature fabrication technologies, covering millimeter wave frequencies up to 94 GHz, are exemplified. Circuit characterisation method using a precision network analyser and on-wafer measurements are described in details. Measurement results of various passive circuits, from a novel power-divider to a 60 GHz six-port circuit, are discussed, validating very good S-parameter and qi point performances. System measurements, using a six-port front-end imbedded in 77 GHz heterodyne FMCW radar, conclude the paper.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"97 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":"123464066","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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