Pub Date : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936478
L. Klozar, J. Prokopec
Signal propagation and path losses are the key elements of wireless network design. This paper describes tuning process of empirical propagation path loss models for typical environments (urban, suburban, open areas). The Hata based models were compared with data measured in Brno. Model corrections were suggested and tested for GSM frequency band. The correction is aimed on the short range propagation in cellular networks. For model fitting to the measured data and for a deviation error estimation was used the mean square error (MSE). The tuned propagation model was used for localization in cellular network using particle swarm optimization (PSO) technique and geometrical technique.
{"title":"Propagation path loss models for mobile communication","authors":"L. Klozar, J. Prokopec","doi":"10.1109/RADIOELEK.2011.5936478","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936478","url":null,"abstract":"Signal propagation and path losses are the key elements of wireless network design. This paper describes tuning process of empirical propagation path loss models for typical environments (urban, suburban, open areas). The Hata based models were compared with data measured in Brno. Model corrections were suggested and tested for GSM frequency band. The correction is aimed on the short range propagation in cellular networks. For model fitting to the measured data and for a deviation error estimation was used the mean square error (MSE). The tuned propagation model was used for localization in cellular network using particle swarm optimization (PSO) technique and geometrical technique.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128197350","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936454
M. Liptaj, P. Galajda, M. Kmec
The paper deals with the recent developments of a differential amplifier designed in 0.35 μm SiGe BiCMOS technology from Austriamicrosystems, Austria (AMS). The amplifier is a part of the manufactured chip, which also contains a pair of low noise amplifiers and digital frequency divider. The manufactured chip will be a part of the set of ASIC circuits designed for implementation in the recent UWB radar system architectures.
{"title":"Recent fully differential amplifier in 0.35 μm SiGe BiCMOS technology for UWB applications","authors":"M. Liptaj, P. Galajda, M. Kmec","doi":"10.1109/RADIOELEK.2011.5936454","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936454","url":null,"abstract":"The paper deals with the recent developments of a differential amplifier designed in 0.35 μm SiGe BiCMOS technology from Austriamicrosystems, Austria (AMS). The amplifier is a part of the manufactured chip, which also contains a pair of low noise amplifiers and digital frequency divider. The manufactured chip will be a part of the set of ASIC circuits designed for implementation in the recent UWB radar system architectures.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117112669","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936445
O. Baran, M. Kasal, P. Vagner, T. Urbanec
This paper deals with the investigation of a simultaneous incidence of the thermal noise and the phase noise in a BPSK/SSB communication system, while the receiver filter bandwidth is being decreased. The way of phase noise modeling is shown. A new approach of the evaluation of the behavior of both noise types is established. It gives derivations of noise powers in significant points of the communication system. The system is also modeled in Matlab and simulation results are compared with calculations, while a good agreement is achieved.
{"title":"Effect of filtration on phase noise in communication systems","authors":"O. Baran, M. Kasal, P. Vagner, T. Urbanec","doi":"10.1109/RADIOELEK.2011.5936445","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936445","url":null,"abstract":"This paper deals with the investigation of a simultaneous incidence of the thermal noise and the phase noise in a BPSK/SSB communication system, while the receiver filter bandwidth is being decreased. The way of phase noise modeling is shown. A new approach of the evaluation of the behavior of both noise types is established. It gives derivations of noise powers in significant points of the communication system. The system is also modeled in Matlab and simulation results are compared with calculations, while a good agreement is achieved.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116208122","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936405
A. Badescu, T. Petrescu, O. Fratu, A. Săftoiu, I. Brancus, B. Mitrica, O. Sima, I. Lazanu, S. Halunga, G. Toma
We are investigating the possibility to reconstruct the energy and direction of cosmic neutrinos from the measured voltage of the radio signals emitted. The detector based on the Askaryan effect is built in salt so all propagation effects that affect the characteristics of the generated radio signal should be characterized. Measurements are also influenced by the properties of antenna so its behavior is briefly discussed. We have considered that limitations in resolution of the electronic system is given by ADC and presented its influence on the recovery of direction of the incoming neutrino.
{"title":"Propagation effects on radio signals emitted in salt by neutrino-induced electromagnetic showers","authors":"A. Badescu, T. Petrescu, O. Fratu, A. Săftoiu, I. Brancus, B. Mitrica, O. Sima, I. Lazanu, S. Halunga, G. Toma","doi":"10.1109/RADIOELEK.2011.5936405","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936405","url":null,"abstract":"We are investigating the possibility to reconstruct the energy and direction of cosmic neutrinos from the measured voltage of the radio signals emitted. The detector based on the Askaryan effect is built in salt so all propagation effects that affect the characteristics of the generated radio signal should be characterized. Measurements are also influenced by the properties of antenna so its behavior is briefly discussed. We have considered that limitations in resolution of the electronic system is given by ADC and presented its influence on the recovery of direction of the incoming neutrino.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129147313","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936465
Z. Kolka, D. Biolek, V. Biolková
The paper deals with a frequency-domain model of memristor and its use for the steady-state analysis by means of the harmonic-balance method. The model is based on a polynomial approximation of its flux-charge constitutive relation, allowing analytical formulation of relations between spectral components of stimulus and response, both for periodic and quasi-periodic steady-state conditions. It is not necessary to transform signals between the time and the frequency domains to obtain the memris-tor response. The paper shows a simple implementation of a single-tone model in Matlab using convolution operators. Example analyses demonstrate the model validity.
{"title":"On steady-state analysis of circuits with memristors","authors":"Z. Kolka, D. Biolek, V. Biolková","doi":"10.1109/RADIOELEK.2011.5936465","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936465","url":null,"abstract":"The paper deals with a frequency-domain model of memristor and its use for the steady-state analysis by means of the harmonic-balance method. The model is based on a polynomial approximation of its flux-charge constitutive relation, allowing analytical formulation of relations between spectral components of stimulus and response, both for periodic and quasi-periodic steady-state conditions. It is not necessary to transform signals between the time and the frequency domains to obtain the memris-tor response. The paper shows a simple implementation of a single-tone model in Matlab using convolution operators. Example analyses demonstrate the model validity.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124128556","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936484
G. A. Rasek, Martin Gabrǐsák
The operating environment of aircraft is characterised by relevant Radio Frequency (RF)-fields. The potential RF exposure of aircraft is commonly called the High Intensity Radiated Fields (HIRF) environment. Aircraft functionality in the HIRF environment is a necessity to reach certification. One effect when operating in the HIRF environment are RF cable bundle and wire currents inside the aircraft. Prior to installation of avionics inside an aircraft this potential threat is tested on equipment and system level via the Bulk Current Injection (BCI) technique. The BCI technique is a substitution method. The conducted injection is used to generate the RF currents on the cable bundles and wires directly. The development of the BCI technique and associated test levels over the last years are discussed in the present paper. In particular the RF current generated with the BCI technique is compared to the one during RF field exposure. A comparison to results for Indirect Effects of Lightning (IEL) is provided.
{"title":"Wire bundle currents for High Intensity Radiated Fields (HIRF) and Indirect Effects of Lightning (IEL) with focus on Bulk Current Injection (BCI) test","authors":"G. A. Rasek, Martin Gabrǐsák","doi":"10.1109/RADIOELEK.2011.5936484","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936484","url":null,"abstract":"The operating environment of aircraft is characterised by relevant Radio Frequency (RF)-fields. The potential RF exposure of aircraft is commonly called the High Intensity Radiated Fields (HIRF) environment. Aircraft functionality in the HIRF environment is a necessity to reach certification. One effect when operating in the HIRF environment are RF cable bundle and wire currents inside the aircraft. Prior to installation of avionics inside an aircraft this potential threat is tested on equipment and system level via the Bulk Current Injection (BCI) technique. The BCI technique is a substitution method. The conducted injection is used to generate the RF currents on the cable bundles and wires directly. The development of the BCI technique and associated test levels over the last years are discussed in the present paper. In particular the RF current generated with the BCI technique is compared to the one during RF field exposure. A comparison to results for Indirect Effects of Lightning (IEL) is provided.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125660519","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936429
I. Hertl, M. Vavrda, Pavel Hanulak
The design of Rotman lens for ESM sensor application in operation band 32–38 GHz is demonstrated in the paper. Initial design made in Remcom's Rotman Lens Designer is confronted with the full-wave analysis in CST Microwave Studio as well as with the results of experimental measurements. Rotman lens was tested as a broadband replacement of conventional waveguide reflective phasers intended for the sensor. Parameters of realized prototype are presented and methods of increasing its performance of the structure are outlined.
{"title":"Rotman lens design for millimeter-wave sensor application","authors":"I. Hertl, M. Vavrda, Pavel Hanulak","doi":"10.1109/RADIOELEK.2011.5936429","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936429","url":null,"abstract":"The design of Rotman lens for ESM sensor application in operation band 32–38 GHz is demonstrated in the paper. Initial design made in Remcom's Rotman Lens Designer is confronted with the full-wave analysis in CST Microwave Studio as well as with the results of experimental measurements. Rotman lens was tested as a broadband replacement of conventional waveguide reflective phasers intended for the sensor. Parameters of realized prototype are presented and methods of increasing its performance of the structure are outlined.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130322961","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936424
L. Dordová, O. Wilfert
The paper is focused on the comparison of Top Hat and Gaussian beam properties from the perspective of received optical power. Gaussian beam is very well known, so there isn't necessary to describe it, on the other hand Top Hat beam, which is created from Gaussian beam, isn't used so widely. Creation of Top Hat is briefly described in this contribution. The main point of the contribution is comparison of received optical power of both types of beams when the beams are redirected by transmitter motion or atmospheric transmission media. Calculations are provided for four receiving lens diameters.
{"title":"Impact of the optical intensity beam profile on received power in conditions of beam wandering","authors":"L. Dordová, O. Wilfert","doi":"10.1109/RADIOELEK.2011.5936424","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936424","url":null,"abstract":"The paper is focused on the comparison of Top Hat and Gaussian beam properties from the perspective of received optical power. Gaussian beam is very well known, so there isn't necessary to describe it, on the other hand Top Hat beam, which is created from Gaussian beam, isn't used so widely. Creation of Top Hat is briefly described in this contribution. The main point of the contribution is comparison of received optical power of both types of beams when the beams are redirected by transmitter motion or atmospheric transmission media. Calculations are provided for four receiving lens diameters.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130279834","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936389
Vit Becvar, M. Bláha, J. Macháč
This paper presents an originally designed planar resonator that shows at the same time negative electric polarizability and magnetic polarizability. The resonator is composed as a combination of electric and magnetic planar resonators. Consequently it is a useful building block for a double negative volumetric metamaterial. The magnetic element is a split ring resonator, and the electric element is an electric dipole terminated by an inductor. The response of the single resonator is strongly anisotropic. A proper spatial arrangement of these resonators can make the response isotropic. The design process has been verified experimentally.
{"title":"Planar resonator with negative electric and magnetic polarizabilities","authors":"Vit Becvar, M. Bláha, J. Macháč","doi":"10.1109/RADIOELEK.2011.5936389","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936389","url":null,"abstract":"This paper presents an originally designed planar resonator that shows at the same time negative electric polarizability and magnetic polarizability. The resonator is composed as a combination of electric and magnetic planar resonators. Consequently it is a useful building block for a double negative volumetric metamaterial. The magnetic element is a split ring resonator, and the electric element is an electric dipole terminated by an inductor. The response of the single resonator is strongly anisotropic. A proper spatial arrangement of these resonators can make the response isotropic. The design process has been verified experimentally.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134364552","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936476
M. Guzan
This item compares the boundary surface and stable manifold of a ternary memory. It points out to their consistency in the case of conventional saddle singularity. The other case, however, occurs at the second saddle — so called virtual. Then the boundary surface calculated using grid method differs from the stable manifold calculated by backward integration technique. The suggested procedure of calculating the stable manifold is hard for calculating and depicting a large number of trajectories — carriers of information about the stable manifold. After calculating the trajectories, stable manifold itself is depicted using the contour lines in the projection into u1, u2 plane.
{"title":"Boundary surface and stable manifold in sequential circuits","authors":"M. Guzan","doi":"10.1109/RADIOELEK.2011.5936476","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936476","url":null,"abstract":"This item compares the boundary surface and stable manifold of a ternary memory. It points out to their consistency in the case of conventional saddle singularity. The other case, however, occurs at the second saddle — so called virtual. Then the boundary surface calculated using grid method differs from the stable manifold calculated by backward integration technique. The suggested procedure of calculating the stable manifold is hard for calculating and depicting a large number of trajectories — carriers of information about the stable manifold. After calculating the trajectories, stable manifold itself is depicted using the contour lines in the projection into u1, u2 plane.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129540503","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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