Pub Date : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092436
A. Serov, A. Shatokhin, N. Serov
Currently, the most informative parameters of electric power are active, reactive and apparent power in the considered frequency band. To measure the parameters of active and reactive power, the application of the method based on averaging of instantaneous power is the most widespread. One of the reasons of the measurement error of these parameters is related to the nonlinearity of the ADC conversion function. To reduce this error in practice, it is required to apply such expensive procedures as individual calibration, which is difficult in the case of mass-produced devices. As a rule, in the electric power measurement instruments, an ADC of successive approximation is used. The shape of the ADC nonlinearity is close to random, which makes it difficult to use polynomial functions for approximation of nonlinearity. This article proposes a method of approximation the ADC nonlinearity by using a random function. Analytical expressions are obtained for the estimation of the measurement error of power parameters caused by the nonlinearity of ADC conversion function. By Matlab software package the simulation modeling is performed. The simulation results are confirmed the validity of the obtained analytical relations. It is shown that the proposed error analysis technique can significantly reduce the final estimation of measurement error of the electric power parameters in comparison with the existing estimation methods.
{"title":"Approximation of ADC Nonlinearity by a Random Function in the Case of Measurement of Electric Power Parameters","authors":"A. Serov, A. Shatokhin, N. Serov","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092436","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092436","url":null,"abstract":"Currently, the most informative parameters of electric power are active, reactive and apparent power in the considered frequency band. To measure the parameters of active and reactive power, the application of the method based on averaging of instantaneous power is the most widespread. One of the reasons of the measurement error of these parameters is related to the nonlinearity of the ADC conversion function. To reduce this error in practice, it is required to apply such expensive procedures as individual calibration, which is difficult in the case of mass-produced devices. As a rule, in the electric power measurement instruments, an ADC of successive approximation is used. The shape of the ADC nonlinearity is close to random, which makes it difficult to use polynomial functions for approximation of nonlinearity. This article proposes a method of approximation the ADC nonlinearity by using a random function. Analytical expressions are obtained for the estimation of the measurement error of power parameters caused by the nonlinearity of ADC conversion function. By Matlab software package the simulation modeling is performed. The simulation results are confirmed the validity of the obtained analytical relations. It is shown that the proposed error analysis technique can significantly reduce the final estimation of measurement error of the electric power parameters in comparison with the existing estimation methods.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"312 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115075306","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092356
B. Bonev, P. Petkov, Luboslava Dimcheva
A fractal Yagi-Uda antenna operating in the 800–960 MHz frequency band is developed and examined in this work. Improvement of bandwidth is achieved through usage of modification of Minkowski fractal - combination of first and second order of the fractal. The SWR, gain, front-to-back ratio and radiation pattern are simulated and compared with these of classic Yagi-Uda antenna. Real model is also assembled and SWR was measured and compared with simulated one.
{"title":"Modified Minkowski Fractal Yagi-Uda Antenna","authors":"B. Bonev, P. Petkov, Luboslava Dimcheva","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092356","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092356","url":null,"abstract":"A fractal Yagi-Uda antenna operating in the 800–960 MHz frequency band is developed and examined in this work. Improvement of bandwidth is achieved through usage of modification of Minkowski fractal - combination of first and second order of the fractal. The SWR, gain, front-to-back ratio and radiation pattern are simulated and compared with these of classic Yagi-Uda antenna. Real model is also assembled and SWR was measured and compared with simulated one.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116596736","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092360
M. Kovalchuk, K. Pitaš, O. Fiser
The height of rain and the zero isotherm height serves as an important parameter to define the satellite link length in the rain volume. This enables to estimate the important rain attenuation. We introduce 5 known models of rain height and computed the zero and minus 15°C isotherme heights in Prague. The typical height of zero isotherm in Prague (-15°C isotherm) varies around 3,5 km (6 km, respectively). We also compared data from seventies with 2019 data. We concluded that now the zero isotherm height is higher (global warming acknowledgement).
{"title":"Rain height study to predict satellite link rain attenuation","authors":"M. Kovalchuk, K. Pitaš, O. Fiser","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092360","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092360","url":null,"abstract":"The height of rain and the zero isotherm height serves as an important parameter to define the satellite link length in the rain volume. This enables to estimate the important rain attenuation. We introduce 5 known models of rain height and computed the zero and minus 15°C isotherme heights in Prague. The typical height of zero isotherm in Prague (-15°C isotherm) varies around 3,5 km (6 km, respectively). We also compared data from seventies with 2019 data. We concluded that now the zero isotherm height is higher (global warming acknowledgement).","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121903654","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092438
Radim Zedka, T. Gotthans, R. Maršálek, J. Blumenstein, Marek Bobula
This paper presents a new approach for evaluating the differences between SC-FDE and OFDM in MISO Clarke/Gans Rayleigh fading channel. At first, base-band models of SC and OFDM are elaborated and principles of STBC encoding and decoding are described in the MISO fading channel. The Clark/Gans Rayleigh fading channel is then defined and extended to create MISO multi-path frequency-selective channel. BER performances are simulated in MATLAB for different level crossing rates and both systems are compared in terms of PMEPR.
{"title":"SC-FDE and OFDM in MISO Frequency-Selective Fading Channels","authors":"Radim Zedka, T. Gotthans, R. Maršálek, J. Blumenstein, Marek Bobula","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092438","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092438","url":null,"abstract":"This paper presents a new approach for evaluating the differences between SC-FDE and OFDM in MISO Clarke/Gans Rayleigh fading channel. At first, base-band models of SC and OFDM are elaborated and principles of STBC encoding and decoding are described in the MISO fading channel. The Clark/Gans Rayleigh fading channel is then defined and extended to create MISO multi-path frequency-selective channel. BER performances are simulated in MATLAB for different level crossing rates and both systems are compared in terms of PMEPR.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125058053","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092437
M. Potocný, Michal Sovcík, V. Stopjaková
As always-on wireless sensing nodes become more and more common, improved AC/DC power conversion solutions for the output loads below 1 W are in increasing demand. Existing commercial solutions suffer from poor efficiency under these conditions, therefore a new approach is necessary. In our previous work, we proposed an AC/DC conversion stage optimized for these conditions specifically. It offers higher power efficiency and lower no-load consumption when compared to existing designs. The proposed conversion stage was since implemented and manufactured in a high-voltage CMOS process. The aim of this paper is to describe the process of measurement and verification of the manufactured samples. The development of the necessary test hardware, in a form of dedicated printed circuit boards, is also included in this paper. As the testing of the converter integrated circuit is still ongoing, only preliminary results are included so far.
{"title":"Development of test equipment for evaluation of low-power AC/DC converter ASIC","authors":"M. Potocný, Michal Sovcík, V. Stopjaková","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092437","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092437","url":null,"abstract":"As always-on wireless sensing nodes become more and more common, improved AC/DC power conversion solutions for the output loads below 1 W are in increasing demand. Existing commercial solutions suffer from poor efficiency under these conditions, therefore a new approach is necessary. In our previous work, we proposed an AC/DC conversion stage optimized for these conditions specifically. It offers higher power efficiency and lower no-load consumption when compared to existing designs. The proposed conversion stage was since implemented and manufactured in a high-voltage CMOS process. The aim of this paper is to describe the process of measurement and verification of the manufactured samples. The development of the necessary test hardware, in a form of dedicated printed circuit boards, is also included in this paper. As the testing of the converter integrated circuit is still ongoing, only preliminary results are included so far.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127406271","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092428
Michal Sovcík, V. Stopjaková, D. Arbet, M. Potocný
This paper proposes implementation of on-chip digital calibration for a variable gain amplifier. It does not require additional setting or test, and therefore, it is autonomous. The calibrated amplifier can be used in continuous operation, while the ‘ping-pong’ technique is utilized. The prototype chip was fabricated in a standard 130 nm CMOS technology, and it operates under the supply voltage of 0.6 V. It is aimed at cancellation of VGA input offset voltage VIOFF. Implemented system was verified through Monte Carlo and corner analysis at the design phase. After fabrication the experimental measurements took place over 10 packaged samples. Its results quite well fits between corners of simulations. The measured calibrated VGA exhibits the input offset voltage from 13 μ$V$ to 167 μV. In order to evaluate the contribution of implemented calibration method, the experimental measurements were also carried out over not calibrated VGA samples. These results reveal VIOFFμ = 403 μ$V$ and σ = 3,45 mV.
{"title":"Autonomous On-Chip Digital Calibration for Analog ICs in Nanotechnologies","authors":"Michal Sovcík, V. Stopjaková, D. Arbet, M. Potocný","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092428","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092428","url":null,"abstract":"This paper proposes implementation of on-chip digital calibration for a variable gain amplifier. It does not require additional setting or test, and therefore, it is autonomous. The calibrated amplifier can be used in continuous operation, while the ‘ping-pong’ technique is utilized. The prototype chip was fabricated in a standard 130 nm CMOS technology, and it operates under the supply voltage of 0.6 V. It is aimed at cancellation of VGA input offset voltage VIOFF. Implemented system was verified through Monte Carlo and corner analysis at the design phase. After fabrication the experimental measurements took place over 10 packaged samples. Its results quite well fits between corners of simulations. The measured calibrated VGA exhibits the input offset voltage from 13 μ$V$ to 167 μV. In order to evaluate the contribution of implemented calibration method, the experimental measurements were also carried out over not calibrated VGA samples. These results reveal VIOFFμ = 403 μ$V$ and σ = 3,45 mV.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127886700","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092379
M. Pecovský, M. Sokol, P. Galajda
This paper deals with the design of an active low pass filter for M-sequence UWB radars. The proposed filter realized in the form of an application-specific integrated circuit uses a modified Sallen-Key topology, exploiting a Cherry-Hooper amplifier in place of an operational amplifier and employs varactors enabling the tuning of the filter cutoff frequency. The feasibility of the concept is proven by simulation and on-die measurement results. According to the measurements, the low pass filter with nominal cutoff frequency of 1 GHz and slope of 10 dB per octave was obtained in the cost-efficient 0.35 µm SiGe BiCMOS technology which is suitable for the integration of the whole M-sequence radar system on a single chip.
本文研究了m序列超宽带雷达有源低通滤波器的设计。所提出的滤波器以特定应用集成电路的形式实现，使用改进的萨伦- key拓扑，利用Cherry-Hooper放大器代替运算放大器，并采用可变容差器实现滤波器截止频率的调谐。仿真和模内测量结果验证了该概念的可行性。根据测量结果，采用具有成本效益的0.35 μ m SiGe BiCMOS技术，获得了标称截止频率为1 GHz、斜率为10 dB /倍频的低通滤波器，适用于将整个m序列雷达系统集成在单芯片上。
{"title":"Integrated Low Pass Filter for M-Sequence UWB Radars","authors":"M. Pecovský, M. Sokol, P. Galajda","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092379","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092379","url":null,"abstract":"This paper deals with the design of an active low pass filter for M-sequence UWB radars. The proposed filter realized in the form of an application-specific integrated circuit uses a modified Sallen-Key topology, exploiting a Cherry-Hooper amplifier in place of an operational amplifier and employs varactors enabling the tuning of the filter cutoff frequency. The feasibility of the concept is proven by simulation and on-die measurement results. According to the measurements, the low pass filter with nominal cutoff frequency of 1 GHz and slope of 10 dB per octave was obtained in the cost-efficient 0.35 µm SiGe BiCMOS technology which is suitable for the integration of the whole M-sequence radar system on a single chip.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114279547","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092344
J. Gotthans, T. Gotthans, R. Maršálek
Fire detection from video has become possible and more feasible in prevention of fire disaster due to deep convolutional neural networks (CNNs) and embedded processing hardware. Artificial intelligence (AI) methods generally require more computational time and hardware with powerful graphical processing unit (GPU). In this paper, we propose cost-effective deep CNN architecture for fire detection from video with respect to computational performance of Jetson Nano from NVIDIA. In our paper we compare CNN networks (AlexNet and SqueezeNet) with our proposed CNN architecture. The proposed CNN architecture finds equilibrium between efficiency and accuracy for target system (Jetson Nano). We used CNNs which show high accuracy and low loss.
{"title":"Deep Convolutional Neural Network for Fire Detection","authors":"J. Gotthans, T. Gotthans, R. Maršálek","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092344","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092344","url":null,"abstract":"Fire detection from video has become possible and more feasible in prevention of fire disaster due to deep convolutional neural networks (CNNs) and embedded processing hardware. Artificial intelligence (AI) methods generally require more computational time and hardware with powerful graphical processing unit (GPU). In this paper, we propose cost-effective deep CNN architecture for fire detection from video with respect to computational performance of Jetson Nano from NVIDIA. In our paper we compare CNN networks (AlexNet and SqueezeNet) with our proposed CNN architecture. The proposed CNN architecture finds equilibrium between efficiency and accuracy for target system (Jetson Nano). We used CNNs which show high accuracy and low loss.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"16 7-8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131528965","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092359
P. Kadera, T. Mikulášek, Jiri Hruska, J. Lacik
The paper presents hyperbolic lens horn antenna for fixed-beam millimeter wave backhaul system. The frequency ranges of 71/76 GHz and 81/86 GHz (E-band) which are perspective for the future point-to-point 5G communications are fully covered. The dielectric material of high-density polyethylene (HDPE) with εr = 2.29 and tanδ = 0.0008 is used for lens design and the stepped rectangular to circular waveguide transition is designed to feed the antenna. The measured realized gain of proposed antenna exceeds 39 dBi, side-lobe suppression in both E and H planes is above 22.1 dB, what helps with directing the point-to-point microwave links, antenna is also relatively light with weight of only 2.4 kg and can comply with radiation pattern envelope of standard ETSI in class 2 (3).
{"title":"Hyperbolic Lens Horn Antenna for Fixed-Beam E-Band Communication","authors":"P. Kadera, T. Mikulášek, Jiri Hruska, J. Lacik","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092359","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092359","url":null,"abstract":"The paper presents hyperbolic lens horn antenna for fixed-beam millimeter wave backhaul system. The frequency ranges of 71/76 GHz and 81/86 GHz (E-band) which are perspective for the future point-to-point 5G communications are fully covered. The dielectric material of high-density polyethylene (HDPE) with εr = 2.29 and tanδ = 0.0008 is used for lens design and the stepped rectangular to circular waveguide transition is designed to feed the antenna. The measured realized gain of proposed antenna exceeds 39 dBi, side-lobe suppression in both E and H planes is above 22.1 dB, what helps with directing the point-to-point microwave links, antenna is also relatively light with weight of only 2.4 kg and can comply with radiation pattern envelope of standard ETSI in class 2 (3).","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134182694","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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