Pub Date : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7129051
Lettl Jiří, Posta Pavel, Bauer Jan
Compared matrix converter with indirect frequency converter, the lacking DC-link accumulation element is its cardinal advantage in terms of volume and weight. On the other hand, in case of matrix converter the control system is much more complex. In the design of matrix converter switching pulse sequence generation the complicated IGBT's commutation process as well as modern sophisticated modulation strategies must be taken into account. System reliability is dependent on the selected commutation algorithm and the proposed modulation strategy significantly affects the maximal reachable output voltage amplitude and thus the whole connected drive dynamics. Times of commutation, semiconductor device minimal switch-on and switch-off times play the essential role, too.
{"title":"Some problems of matrix converter switching pattern generation design","authors":"Lettl Jiří, Posta Pavel, Bauer Jan","doi":"10.1109/RADIOELEK.2015.7129051","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7129051","url":null,"abstract":"Compared matrix converter with indirect frequency converter, the lacking DC-link accumulation element is its cardinal advantage in terms of volume and weight. On the other hand, in case of matrix converter the control system is much more complex. In the design of matrix converter switching pulse sequence generation the complicated IGBT's commutation process as well as modern sophisticated modulation strategies must be taken into account. System reliability is dependent on the selected commutation algorithm and the proposed modulation strategy significantly affects the maximal reachable output voltage amplitude and thus the whole connected drive dynamics. Times of commutation, semiconductor device minimal switch-on and switch-off times play the essential role, too.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131461260","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 : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7129028
Josef Vychodil, A. Chandra, T. Mikulášek, A. Prokeš, V. Derbek
This paper describes a time domain channel sounder based on pseudorandom binary sequences. The channel sounder system consists of several off-the-shelf laboratory instruments connected together and controlled from PC. Frequency band of interest is the unlicensed ultra wide band, 3-11 GHz. The system's parameters are discussed and compared to conventional solution, which uses vector network analyzer (VNA). Crucial feature of the proposed system is fast measurement speed. Example measurements are provided and compared to the measurements performed using the VNA.
{"title":"UWB time domain channel sounder","authors":"Josef Vychodil, A. Chandra, T. Mikulášek, A. Prokeš, V. Derbek","doi":"10.1109/RADIOELEK.2015.7129028","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7129028","url":null,"abstract":"This paper describes a time domain channel sounder based on pseudorandom binary sequences. The channel sounder system consists of several off-the-shelf laboratory instruments connected together and controlled from PC. Frequency band of interest is the unlicensed ultra wide band, 3-11 GHz. The system's parameters are discussed and compared to conventional solution, which uses vector network analyzer (VNA). Crucial feature of the proposed system is fast measurement speed. Example measurements are provided and compared to the measurements performed using the VNA.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133416722","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 : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7128989
J. Neburka, Zdenek Tlamsa, Vlastimil Benes, L. Polak, O. Kaller, L. Klozar, L. Bolecek, Ondrej Zach, Jan Kufa, J. Sebesta, T. Kratochvil
The number of wirelessly connected multimedia devices and different communication standards, supported by these devices, is rapidly increasing. However, the appropriate frequency bands (licensed and unlicensed) for data transmission by these standards are very limited. The rising density of wireless networks and their coexistence in the same or adjacent radio frequency (RF) spectrum can significantly decrease the quality of provided services. This paper deals with the study of coexistence between ZigBee (IEEE 802.15.4) and Wireless Fidelity (Wi-Fi) networks, including the IEEE 802.11b/g standards, which operate in the unlicensed Industrial, Scientific and Medical (ISM) band at 2.4 GHz. Firstly, a general simulation model was developed. Secondly, to verify results from simulation by measurement, an appropriate laboratory workplace in anechoic chamber was proposed and realized. Such setup and the measurement principle are briefly described in this paper too. Impact of the IEEE 802.11b/g networks on the ZigBee and vice versa is evaluated by dependence of bit error rate (BER) and error vector magnitude (EVM) on the power imbalance between power levels of considered RF signals, respectively.
{"title":"Study of the coexistence between ZigBee and Wi-Fi IEEE 802.11b/g networks in the ISM band","authors":"J. Neburka, Zdenek Tlamsa, Vlastimil Benes, L. Polak, O. Kaller, L. Klozar, L. Bolecek, Ondrej Zach, Jan Kufa, J. Sebesta, T. Kratochvil","doi":"10.1109/RADIOELEK.2015.7128989","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7128989","url":null,"abstract":"The number of wirelessly connected multimedia devices and different communication standards, supported by these devices, is rapidly increasing. However, the appropriate frequency bands (licensed and unlicensed) for data transmission by these standards are very limited. The rising density of wireless networks and their coexistence in the same or adjacent radio frequency (RF) spectrum can significantly decrease the quality of provided services. This paper deals with the study of coexistence between ZigBee (IEEE 802.15.4) and Wireless Fidelity (Wi-Fi) networks, including the IEEE 802.11b/g standards, which operate in the unlicensed Industrial, Scientific and Medical (ISM) band at 2.4 GHz. Firstly, a general simulation model was developed. Secondly, to verify results from simulation by measurement, an appropriate laboratory workplace in anechoic chamber was proposed and realized. Such setup and the measurement principle are briefly described in this paper too. Impact of the IEEE 802.11b/g networks on the ZigBee and vice versa is evaluated by dependence of bit error rate (BER) and error vector magnitude (EVM) on the power imbalance between power levels of considered RF signals, respectively.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130591338","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 : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7128984
Filip Holík, J. Horalek, Sona Neradova, Stanislav Zitta, Martin Novak
Information is the essential building block of society and is found in each field of business. They can represent a business plan, personnel data, manufacturing know-how, financial transactions and many others. Information is part of company assets and thus has to be protected. This article describes methods of deploying security standards in a business environment. The practical part of the article describes implementation of Information Security Management System in a real automotive company located in the Czech Republic.
{"title":"Methods of deploying security standards in a business environment","authors":"Filip Holík, J. Horalek, Sona Neradova, Stanislav Zitta, Martin Novak","doi":"10.1109/RADIOELEK.2015.7128984","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7128984","url":null,"abstract":"Information is the essential building block of society and is found in each field of business. They can represent a business plan, personnel data, manufacturing know-how, financial transactions and many others. Information is part of company assets and thus has to be protected. This article describes methods of deploying security standards in a business environment. The practical part of the article describes implementation of Information Security Management System in a real automotive company located in the Czech Republic.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"238 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116000063","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 : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7128979
D. Matousek, Bohumil Brtnik, T. Zálabský
The RLCG meter is usually constructed from separate analogue oscillator as a source of test signal and two phase detectors that obtain real and imaginary part. In some cases the real and imaginary parts are calculated by using DFT (Discrete Fourier Transform). More sophisticate solution is described in this paper. Proposed solution is based on fully digital conception, when test signal is generated in digital form and this signal (in the same form) is simply used for phase detection.
{"title":"Proposed method of realization of RLCG meter","authors":"D. Matousek, Bohumil Brtnik, T. Zálabský","doi":"10.1109/RADIOELEK.2015.7128979","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7128979","url":null,"abstract":"The RLCG meter is usually constructed from separate analogue oscillator as a source of test signal and two phase detectors that obtain real and imaginary part. In some cases the real and imaginary parts are calculated by using DFT (Discrete Fourier Transform). More sophisticate solution is described in this paper. Proposed solution is based on fully digital conception, when test signal is generated in digital form and this signal (in the same form) is simply used for phase detection.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114158304","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 : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7129032
A. Mishra
The effort to use existing communication systems as radars and vice versa has been there since the last great war. The current work describes a new way to use the existing communication systems to sense the change in the environment. This kind of radar, named as CommSens by the author, can be used in tasks like crop growth monitoring, disaster monitoring, sea state monitoring etc. The key to this technology lies in the use of pilot signal in the communication signal frames to monitor the channel and thereby estimate the change in the channel state.
{"title":"CommSense: Radar system using existing communication infrastructure to sense the environment","authors":"A. Mishra","doi":"10.1109/RADIOELEK.2015.7129032","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7129032","url":null,"abstract":"The effort to use existing communication systems as radars and vice versa has been there since the last great war. The current work describes a new way to use the existing communication systems to sense the change in the environment. This kind of radar, named as CommSens by the author, can be used in tasks like crop growth monitoring, disaster monitoring, sea state monitoring etc. The key to this technology lies in the use of pilot signal in the communication signal frames to monitor the channel and thereby estimate the change in the channel state.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125359605","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 : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7129013
M. Stanek, Tomas Smatana
This paper presents the comparison of five commonly used methods for fundamental frequency detection in speech signal, exactly in vocal and melodic instrument signals. The efficiency of chosen method is verified on known set of musical notes performed by bass clarinet. The highest efficiency in fundamental frequency detection was reached by AutoCorrelation (ACF) and Modified AutoCorrelation (MACF) functions. Self-repairing algorithm is also described in this paper and it can be defined as a useful tool for correction of inaccurately found fundamental frequencies related to relevant musical notes. For correct pitch detection and self-repairing algorithm function, as the most appropriate segment length can be set as a half value of the shortest known musical note in analysed signal. Due to high efficiency and low computational preformance, the combination of ACF, MACF respectively, with self-repairing algorithm supplemented by some fundamental frequency changing method can be used as an effective almost real-time tool for tuning and other musical applications.
{"title":"Comparison of fundamental frequency detection methods and introducing simple self-repairing algorithm for musical applications","authors":"M. Stanek, Tomas Smatana","doi":"10.1109/RADIOELEK.2015.7129013","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7129013","url":null,"abstract":"This paper presents the comparison of five commonly used methods for fundamental frequency detection in speech signal, exactly in vocal and melodic instrument signals. The efficiency of chosen method is verified on known set of musical notes performed by bass clarinet. The highest efficiency in fundamental frequency detection was reached by AutoCorrelation (ACF) and Modified AutoCorrelation (MACF) functions. Self-repairing algorithm is also described in this paper and it can be defined as a useful tool for correction of inaccurately found fundamental frequencies related to relevant musical notes. For correct pitch detection and self-repairing algorithm function, as the most appropriate segment length can be set as a half value of the shortest known musical note in analysed signal. Due to high efficiency and low computational preformance, the combination of ACF, MACF respectively, with self-repairing algorithm supplemented by some fundamental frequency changing method can be used as an effective almost real-time tool for tuning and other musical applications.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116818683","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 : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7129015
Yamin Li, Dianhong Wang, Weimin Zhang
Determined by the generating mechanism of AE event, AE signal has significant energy characteristics which can be used for identification. In this paper, a real-time embedded crack identification system of brittle material is designed and implemented. The system is fully functional that integrates AE signal acquisition, de-noising, signal extraction, characteristic recognition and alarm. In addition, an Energy-ratio based signal processing method is developed on the basis of statistical analysis of numerous brittle material crack data. Both the proposed system and method are verified on a test-bed deployed in a factory workshop. Experiment results show that the method has a satisfying identification accuracy and real-time performance in the noisy environment.
{"title":"Real-time identification of brittle material crack under high pressure based on AE signal analysis","authors":"Yamin Li, Dianhong Wang, Weimin Zhang","doi":"10.1109/RADIOELEK.2015.7129015","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7129015","url":null,"abstract":"Determined by the generating mechanism of AE event, AE signal has significant energy characteristics which can be used for identification. In this paper, a real-time embedded crack identification system of brittle material is designed and implemented. The system is fully functional that integrates AE signal acquisition, de-noising, signal extraction, characteristic recognition and alarm. In addition, an Energy-ratio based signal processing method is developed on the basis of statistical analysis of numerous brittle material crack data. Both the proposed system and method are verified on a test-bed deployed in a factory workshop. Experiment results show that the method has a satisfying identification accuracy and real-time performance in the noisy environment.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130673863","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 : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7129024
Anatolii Omelchenko, Oleksii Fedorov
Estimators for polynomial regression coefficients in case when correlation function of observation noise is not completely known have been considered. It was shown that sufficient statistics to define i-th order regression coefficient with respect to equidistantly spaced samples are finite differences of the same order. The major attention was paid to research into roundoff noises influence on precision of polynomial regression coefficients computation.
{"title":"Polynomial regression coefficients estimation in finite differences space","authors":"Anatolii Omelchenko, Oleksii Fedorov","doi":"10.1109/RADIOELEK.2015.7129024","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7129024","url":null,"abstract":"Estimators for polynomial regression coefficients in case when correlation function of observation noise is not completely known have been considered. It was shown that sufficient statistics to define i-th order regression coefficient with respect to equidistantly spaced samples are finite differences of the same order. The major attention was paid to research into roundoff noises influence on precision of polynomial regression coefficients computation.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128122091","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 : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7128998
A. Gleser, O. Ondrácek
This paper reviews sustainable developments and new trends in process visualization methods - especially the use for the RFID (radio frequency identification system) technology. Starting from the motivation for developing a new process visualization method named Glauto process chain paradigm in chapter I. Afterwards is be found an overview about existing process visualization methods. The next chapter introduces the research objective for the Glauto method and defines the position in the existing landscape of methods for process visualization. Several experts' opinions by a survey to several companies and research facilities, which are using process modeling and - analyzing methods, are used as a basis to develop the new method. Afterwards the procedure of process recording with Glauto as well as process types and key figures for Glauto will be defined. Next is to be found a sample for process visualization with Glauto. It contains the operation block diagrams as well as basic operations, connecting- and logic symbols.
{"title":"Process visualization methods for RFID systems","authors":"A. Gleser, O. Ondrácek","doi":"10.1109/RADIOELEK.2015.7128998","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7128998","url":null,"abstract":"This paper reviews sustainable developments and new trends in process visualization methods - especially the use for the RFID (radio frequency identification system) technology. Starting from the motivation for developing a new process visualization method named Glauto process chain paradigm in chapter I. Afterwards is be found an overview about existing process visualization methods. The next chapter introduces the research objective for the Glauto method and defines the position in the existing landscape of methods for process visualization. Several experts' opinions by a survey to several companies and research facilities, which are using process modeling and - analyzing methods, are used as a basis to develop the new method. Afterwards the procedure of process recording with Glauto as well as process types and key figures for Glauto will be defined. Next is to be found a sample for process visualization with Glauto. It contains the operation block diagrams as well as basic operations, connecting- and logic symbols.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128365330","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：