2019 IEEE International Scientific-Practical Conference Problems of Infocommunications, Science and Technology (PIC S&T), 2019
Novel method of radio relay link bandwidth capacity improvement based on spatial signal processin... more Novel method of radio relay link bandwidth capacity improvement based on spatial signal processing by the wave front of the electromagnetic wave are presented. Test results of a variant of one-hop simplex radio relay link lab prototype with spatial signal processing both in the transmitting and receiving sites are shown. This prototype provides simultaneous parallel wireless transmission of two DVB-C radio signals with 64-QAM modulations at bit rates of 41.25 Mbps over 8 MHz bandwidth with the same carrier frequency of 10.56 GHz and with the same electromagnetic waves polarization at distance of 8 meters. This prototype can be used for research the possibility of radio frequency resource reuse and bandwidth capability improvement for radio relay links by applying spatial signal processing techniques.
2020 IEEE International Conference on Problems of Infocommunications. Science and Technology (PIC S&T), 2020
This paper discusses the issue of DVB-S2 digital television signal generation from a transport TV... more This paper discusses the issue of DVB-S2 digital television signal generation from a transport TV stream using an Nuand BladeRF x40 SDR transceiver operating under the GNURadio software environment. The quality of the generated DVB-S2 signal was evaluated in the process of its demodulation and decoding using the Prof 7500 DVB-S2 satellite TV signals receiver, running under the control of CrazyScan and TSReader programs. Research results showed the possibility of generating a DVB-S2 signal with standard roll-off factors of 0.2 and even with roll-off factors of 0.1 and 0.05, which is equivalent to reducing the frequency band occupied by a DVB-S2 signal with constant symbol rate to 8.3% and 12.5% respectively or transport stream bitrate increase up to 9,1% and 14,3% with constant DVB-S2 signal bandwidth. Also its shown that roll-off values usage less than 0.05 reduces DVB-S2 signal bandwidth but this leads to the signal-to-noise ratio degradation by 2…2.5 dB. This paper will be useful ...
2018 International Conference on Information and Telecommunication Technologies and Radio Electronics (UkrMiCo), 2018
This paper presents a variant of “point-to-point” unidirectional microwave wireless communication... more This paper presents a variant of “point-to-point” unidirectional microwave wireless communication system prototype with spatial signal processing both in the transmitting and receiving devices. This prototype provides simultaneous parallel transmission over a wireless communication channel of two DVB-C digital television signals at a speed of 41 Mbit/s each in the same radio frequency band and with the same electromagnetic wave polarization. This prototype can be used for research the possibility of radio frequency resource reuse in radio-relay systems by applying spatial signal processing methods. The proposed prototype of unidirectional wireless communication system can be useful for radio-relay systems developers.
This report proposes a new method for expanding the stopband of pseudocombline bandpass filters (... more This report proposes a new method for expanding the stopband of pseudocombline bandpass filters (BPF). This BPF contains resonators from segments of half-wave transmission lines, both ends of which are open. Half-wave (λ/2) resonators are parallel to each other without mutual offset. This BPF design is compact enough, and the absence of short-circuited ends provides some advantage. The disadvantage of such BPF is a lot of spurious passbands and not wide enough stopband located between the main bandpass and first spurious bandpass. The proposed method is based on the features of the input functions of half-wave resonators for various coordinates of connection to these resonators. To obtain a wide stopband, spurious passbands associated with higher (parasitic) resonant frequencies 2f0, 3f0, 4f0, etc. are consistently eliminated. To do this, the resonators are connected to each other at special points located at a certain distance from the open ends of the resonators. Using the suggest...
This paper discusses the issue of DVB-S2 digital television signal generation from a multi-progra... more This paper discusses the issue of DVB-S2 digital television signal generation from a multi-program transport TV stream using an Nuand BladeRF x40 SDR transceiver operating under the GNURadio software environment. The quality of the generated DVB-S2 signal was evaluated in the process of its demodulation and decoding using the Prof 7500 DVB-S2 satellite TV signals receiver, running under the control of CrazyScan and TSReader programs. Research results showed the possibility of generating a DVB-S2 signal with standard roll-off factors of 0.2 and even with roll-off factors of 0.1 and 0.05, which is equivalent to reducing the frequency band occupied by a DVB-S2 signal with constant symbol rate to 8.3% and 12.5% respectively or transport stream bitrate increase up to 9,1% and 14,3% with constant DVB-S2 signal bandwidth. Also its shown that roll-off values usage less than 0.05 reduces the the DVB-S2 signal bandwidth but leads to the signal-to-noise ratio degradation by 6..10 dB. This pape...
A block diagram and electric circuit of impulse radio ultrawideband signal generator based on ste... more A block diagram and electric circuit of impulse radio ultrawideband signal generator based on step recovery diode are presented. The simulation results of the impulse radio ultrawideband signal generator with step recovery diode indicates the possibility of receiving at its output an impulse radio ultrawideband signal with a time duration less than 1 nanosecond, $0. 3-2.5$ GHz frequency bandwidth and a pulse amplitude that does not exceed $0.3\cdots 0.45$ voltages. A prototype of impulse radio ultrawideband signal generator printed-circuit board also was developed, manufactured and tested. Test results shown that this prototype can generate impulse radio ultrawideband signal which occupies $0. 6-2.7$ GHz frequency bandwidth. This paper may be useful for impulse radio ultrawideband wireless communication system developers and researchers.
Radio Electronics & Info Communications (UkrMiCo), 2016 International Conference, 2016
– The version of the modification of the classic bearing Capon's algorithm is presented to determ... more – The version of the modification of the classic bearing Capon's algorithm is presented to determine the position (the bearing and the distance) of the sources of radiation and their subsequent spatial selection as in the far and in the near and intermediate wave zones of the antenna array for analysis by the monitoring system.
Telecommunication sciences (Information and telecommunication sciences), 2012
The mathematical modeling of amplitude and phase distribution of the electromagnetic fields at th... more The mathematical modeling of amplitude and phase distribution of the electromagnetic fields at the aperture of the receiving antenna system has been performed. The possibility of frequency reuse in radio relay link under condition when two transmitters operate simultaneously on the same frequency and with same polarization is substantially investigated by using the phenomenon of phase front curvature of electromagnetic wave. An effective approach to optimal spatial processing of two radio signals from two transmitters at the receiving side of radio relay link is developed. The mathematical expressions allowing the theoretical analysis of spatial processing of radio relay link signals are obtained. The results of theoretical investigations are extensively discussed. The references for practical application of obtained results at the development of microwave link equipment are given.
Background. Talking about evolution of passive radar systems and multifunction antenna systems, i... more Background. Talking about evolution of passive radar systems and multifunction antenna systems, it is necessary to acknowledge that distributed antenna systems (DAS) are supposed to be widely spread in the very near future in many areas of human activity, such as organization of high-quality mobile communication in large offices, shopping centers, fitness buildings and so on. Structurally, DAS consist of different groups of antennas and base stations with active and passive repeaters of radio signals. Generally, mutual location of such antennas and base stations can be chosen experimentally according to the criterion of service area maximization. For the further quality of service improvement, it is necessary to use smart antennas in DAS as basic structure elements. The use of smart antennas will allow tracking the subscriber`s (or SOR – source of radiation) location by means of direction-finding (DF) and to increase radiation power of radio signal towards SOR thus decreasing interference to other subscribers. It is important to note that amplitude methods of DF are unacceptable in this case because base stations have antenna beam patterns which are rather wide. Use of phase methods for direction finding is actual but constrained because of electromagnetic waves (EMW) multipath propagation and large DF errors caused by the following reason – it happens that SOR is located in Fresnel zone of direction-finder antenna system. So, consideration of the phenomenon of EMW front curvature in DAS is very important in order to construct direction-finders. Objective. Consideration of EMW phase front sphericity (curvature) and its influence on the accuracy of SOR coordinates determination measured by DAS phase methods. Scheme technical decisions of phase direction-finders (PDF) based on this process are also represented. Methods. To study the effect of the EMW phase front curvature on the accuracy of determining the coordinates of the SOR analytical dependencies are synthesized. Calculations of the direction characteristics, errors in determining the phase shifts between the antenna elements of the phase direction-finder, as well as the error in determining the distance to SOR in the Fresnel zone as a function of the range to SOR and its bearing were made based on MathCad 14 program. Results. During the process of SOR angular coordinates determination in Fresnel zone with use of EMW phase front curvature оn the basis of planar antenna array, it is necessary to execute consistently two operations: 1) to define the fact of presence of EMW phase front curvature; 2) to switch PDF from the mode of bearing and tilt angles estimation (when it is in plane phase front) to the mode of bearing and tilt angles estimation (and also distance to SOR if needed) with phase front curvature of EMW. Taking into account the analysis relating to errors of bearing angle measurements in Fresnel zone (depending on the location of rough, but exact bases, for three-element sparse LAA) it is possible to conclude that their position doesn't impact on exactness of bearing angle measuring in PDF. But to support more exact determination of SOR distance they must be placed in the center of exact, but ambiguous bases of PDF. Conclusions. Failure to take into account EMW phase front curvature from SOR harmonic signal leads to errors of SOR coordinate calculation under conditions of its location in Fresnel zone and absence of other SORs. Knowledge of distance to SOR can be used in passive radar systems, in radio monitoring systems of radio interference sources which have bearing angles equal with useful SOR ones, but located on different distances from useful SOR. This knowledge can also be used in mobile communication networks to strengthen signal level on certain distance with EMW energy focusing, in vehicle control systems on the basis of the satellite navigation systems etc.
Background. Currently digital microwave radio relay links operating in centimeter bands and in th... more Background. Currently digital microwave radio relay links operating in centimeter bands and in the lower part of millimeter bands (3.4-40.5 GHz) are widely used in the leading countries to construct their telecommunication infrastructure. Taking into account the lack of spectrum in these frequency bands and growing necessity to transmit high-rate applications with the help of brand-new radio relay equipment of the world leading manufacturers of such equipment, tendency to operate in higher parts of millimeter bands is becoming more real and practicable. At the same time, the terahertz band (100-3000 GHz) which is not used at the present time (because of complexity of construction of radio relay equipment that could operate in this band) is also very perspective for introduction of the future radio relay equipment (for the reason of high information capacity of 100-3000 GHz band). The Research Telecommunication Institute of the National Technical University of Ukraine and the Institute of Electronics and Communications of the Ukrainian Academy of Science developed the prototype of the transceiver for operation in the lower part of the terahertz band (130-132 GHz band). For this reason there was a necessity to conduct research concerning operation of the prototype in 130-132 GHz band (that is to test quality of operation of separate blocks of transceiver by changing parameters of transmitting signals passing through it). Objective. The purpose of the research is the parameters variation of multichannel digital broadcasting TV signals based on DVB-C standard when TV signal is transmitted through the 130 GHz transceiver prototype. DVB-C standard has been chosen for this research to have opportunity to analyze signals with different modulation schemes (from QAM-64 to QAM-256), which allowed investigating the influence of certain prototype node parameters on the signal parameters that were transmitted through it Methods. To conduct the research the experimental installation has been constructed with several parts in it (transceiver, subsystem for generation of DVB-C television signals, subsystem for measurement of DVB-C television signal parameters). The research has been conducted in three stages using a step-by-step approach with application of one-channel, two-channel and three-channel signals of DVB-C standard. Results. Results of the research showed that the use of the transceiver (that has common heterodyne for transmitting and receiving parts) in the lower part of terahertz band (130 GHz) permits to transmit three TV broadcasting channels of DVB-C standard in 24 MHz bandwidth with transmission rate of 125 Mbit/s with high subjective quality of all TV programs. Conclusions. The results of the research demonstrated high quality of digital TV signals transmission by means of transceiver constructed for application in terahertz band (130-132 GHz). The reason for such conclusion is that harmonic distortions have not been observed and phase noise of heterodyne has not led to significant channel symbols distortion on signal constellation. The next step in future research will include the research of the quality of DVB-C signal transmission for cases when terahertz radio link is used and specific heterodynes are applied in transmitting and receiving parts of the transceiver prototype. In the future the transceiver can be used for construction of digital microwave radio relay links in terahertz band for transmission and reception of digital TV signals with high rate both for broadcasting and other applications such as Internet.
2014 24th International Crimean Conference Microwave & Telecommunication Technology, 2014
Theoretical possibilities of increasing capacity of a single-interval radio relay line by means o... more Theoretical possibilities of increasing capacity of a single-interval radio relay line by means of the physical phenomenon of phase front curvature of electromagnetic waves are presented. Location of repeaters of radio relay stations (RRS) in Fresnel zone is the main condition. The scheme for implementation of this method and results of modeling distances (bases) up to additional antennas of repeaters of RRS for different signal/noise + interference ratio (SNIR) are shown as well.
2014 24th International Crimean Conference Microwave & Telecommunication Technology, 2014
The present paper concerns the circuit implementation of a phase radio direction finder for coord... more The present paper concerns the circuit implementation of a phase radio direction finder for coordinate determination of radiation sources with harmonic signals. The use of sparse linear antenna arrays and radiation source are examined. The feature of this radio direction finder is an ability to operate in the frequency band. The basic relations for the direction-finding characteristics, which allow providing the operation of the radio direction finder in the frequency range using measured wavelength and implementation of the demodulation unit on broadband quadrature bridges.
Practical methods for the measuring devices creation which allow determining new information para... more Practical methods for the measuring devices creation which allow determining new information parameter in the microwave systems - difference of the phase differences (double phase difference) are shown.
Microwave and Telecommunication Technology, 2006. CriMiCO '06. 16th International Crimean Conference, 2006
Structure scheme of the radiation sources discrimination system with using curvature of the front... more Structure scheme of the radiation sources discrimination system with using curvature of the front of the electromagnetic wave is shown with possibility of jammer suppression and its location determination
Microwave & Telecommunication Technology, 2005 15th International Crimean Conference, 2005
The possibility of interference suppression using difference in spherical waves of signal and int... more The possibility of interference suppression using difference in spherical waves of signal and interference is shown. Both interference level suppression and signal attenuation characteristics are presented.
There is an actual problem of finding new or improvement of the position determination methods (P... more There is an actual problem of finding new or improvement of the position determination methods (PDM) of the RS in the radio engineering systems (RES). There are many PDM methods in RES. But it is also submitted in the work about possibility of the location determination (bearing and range) using curvature of the electromagnetic wave front without showing mathematical formulas for its calculation. So the main object of this report to view PDM features with mathematical formulas for bearing and range of the RS derivation and its calculation error estimation by using curvature of the electromagnetic wave front.
Theoretical possibility of jammer and signal sources’ discrimination procedure is shown by using ... more Theoretical possibility of jammer and signal sources’ discrimination procedure is shown by using requirements for radiation sources discrimination system (SDS).
Space-time processing (STP) methods for interference cancellation and signal extraction using fou... more Space-time processing (STP) methods for interference cancellation and signal extraction using four-dimensional matrices are shown.
Peculiarities of the determination of location of the radiation source based on the curvature of ... more Peculiarities of the determination of location of the radiation source based on the curvature of the front of its electromagnetic wave are discussed.
Approaches and technical solutions used for determining coordinates of radiation source with harm... more Approaches and technical solutions used for determining coordinates of radiation source with harmonic signal located in intermediate zone (Fresnel zone) of linear antenna array that is a part of phase coordinates determination system are considered.
2019 IEEE International Scientific-Practical Conference Problems of Infocommunications, Science and Technology (PIC S&T), 2019
Novel method of radio relay link bandwidth capacity improvement based on spatial signal processin... more Novel method of radio relay link bandwidth capacity improvement based on spatial signal processing by the wave front of the electromagnetic wave are presented. Test results of a variant of one-hop simplex radio relay link lab prototype with spatial signal processing both in the transmitting and receiving sites are shown. This prototype provides simultaneous parallel wireless transmission of two DVB-C radio signals with 64-QAM modulations at bit rates of 41.25 Mbps over 8 MHz bandwidth with the same carrier frequency of 10.56 GHz and with the same electromagnetic waves polarization at distance of 8 meters. This prototype can be used for research the possibility of radio frequency resource reuse and bandwidth capability improvement for radio relay links by applying spatial signal processing techniques.
2020 IEEE International Conference on Problems of Infocommunications. Science and Technology (PIC S&T), 2020
This paper discusses the issue of DVB-S2 digital television signal generation from a transport TV... more This paper discusses the issue of DVB-S2 digital television signal generation from a transport TV stream using an Nuand BladeRF x40 SDR transceiver operating under the GNURadio software environment. The quality of the generated DVB-S2 signal was evaluated in the process of its demodulation and decoding using the Prof 7500 DVB-S2 satellite TV signals receiver, running under the control of CrazyScan and TSReader programs. Research results showed the possibility of generating a DVB-S2 signal with standard roll-off factors of 0.2 and even with roll-off factors of 0.1 and 0.05, which is equivalent to reducing the frequency band occupied by a DVB-S2 signal with constant symbol rate to 8.3% and 12.5% respectively or transport stream bitrate increase up to 9,1% and 14,3% with constant DVB-S2 signal bandwidth. Also its shown that roll-off values usage less than 0.05 reduces DVB-S2 signal bandwidth but this leads to the signal-to-noise ratio degradation by 2…2.5 dB. This paper will be useful ...
2018 International Conference on Information and Telecommunication Technologies and Radio Electronics (UkrMiCo), 2018
This paper presents a variant of “point-to-point” unidirectional microwave wireless communication... more This paper presents a variant of “point-to-point” unidirectional microwave wireless communication system prototype with spatial signal processing both in the transmitting and receiving devices. This prototype provides simultaneous parallel transmission over a wireless communication channel of two DVB-C digital television signals at a speed of 41 Mbit/s each in the same radio frequency band and with the same electromagnetic wave polarization. This prototype can be used for research the possibility of radio frequency resource reuse in radio-relay systems by applying spatial signal processing methods. The proposed prototype of unidirectional wireless communication system can be useful for radio-relay systems developers.
This report proposes a new method for expanding the stopband of pseudocombline bandpass filters (... more This report proposes a new method for expanding the stopband of pseudocombline bandpass filters (BPF). This BPF contains resonators from segments of half-wave transmission lines, both ends of which are open. Half-wave (λ/2) resonators are parallel to each other without mutual offset. This BPF design is compact enough, and the absence of short-circuited ends provides some advantage. The disadvantage of such BPF is a lot of spurious passbands and not wide enough stopband located between the main bandpass and first spurious bandpass. The proposed method is based on the features of the input functions of half-wave resonators for various coordinates of connection to these resonators. To obtain a wide stopband, spurious passbands associated with higher (parasitic) resonant frequencies 2f0, 3f0, 4f0, etc. are consistently eliminated. To do this, the resonators are connected to each other at special points located at a certain distance from the open ends of the resonators. Using the suggest...
This paper discusses the issue of DVB-S2 digital television signal generation from a multi-progra... more This paper discusses the issue of DVB-S2 digital television signal generation from a multi-program transport TV stream using an Nuand BladeRF x40 SDR transceiver operating under the GNURadio software environment. The quality of the generated DVB-S2 signal was evaluated in the process of its demodulation and decoding using the Prof 7500 DVB-S2 satellite TV signals receiver, running under the control of CrazyScan and TSReader programs. Research results showed the possibility of generating a DVB-S2 signal with standard roll-off factors of 0.2 and even with roll-off factors of 0.1 and 0.05, which is equivalent to reducing the frequency band occupied by a DVB-S2 signal with constant symbol rate to 8.3% and 12.5% respectively or transport stream bitrate increase up to 9,1% and 14,3% with constant DVB-S2 signal bandwidth. Also its shown that roll-off values usage less than 0.05 reduces the the DVB-S2 signal bandwidth but leads to the signal-to-noise ratio degradation by 6..10 dB. This pape...
A block diagram and electric circuit of impulse radio ultrawideband signal generator based on ste... more A block diagram and electric circuit of impulse radio ultrawideband signal generator based on step recovery diode are presented. The simulation results of the impulse radio ultrawideband signal generator with step recovery diode indicates the possibility of receiving at its output an impulse radio ultrawideband signal with a time duration less than 1 nanosecond, $0. 3-2.5$ GHz frequency bandwidth and a pulse amplitude that does not exceed $0.3\cdots 0.45$ voltages. A prototype of impulse radio ultrawideband signal generator printed-circuit board also was developed, manufactured and tested. Test results shown that this prototype can generate impulse radio ultrawideband signal which occupies $0. 6-2.7$ GHz frequency bandwidth. This paper may be useful for impulse radio ultrawideband wireless communication system developers and researchers.
Radio Electronics & Info Communications (UkrMiCo), 2016 International Conference, 2016
– The version of the modification of the classic bearing Capon's algorithm is presented to determ... more – The version of the modification of the classic bearing Capon's algorithm is presented to determine the position (the bearing and the distance) of the sources of radiation and their subsequent spatial selection as in the far and in the near and intermediate wave zones of the antenna array for analysis by the monitoring system.
Telecommunication sciences (Information and telecommunication sciences), 2012
The mathematical modeling of amplitude and phase distribution of the electromagnetic fields at th... more The mathematical modeling of amplitude and phase distribution of the electromagnetic fields at the aperture of the receiving antenna system has been performed. The possibility of frequency reuse in radio relay link under condition when two transmitters operate simultaneously on the same frequency and with same polarization is substantially investigated by using the phenomenon of phase front curvature of electromagnetic wave. An effective approach to optimal spatial processing of two radio signals from two transmitters at the receiving side of radio relay link is developed. The mathematical expressions allowing the theoretical analysis of spatial processing of radio relay link signals are obtained. The results of theoretical investigations are extensively discussed. The references for practical application of obtained results at the development of microwave link equipment are given.
Background. Talking about evolution of passive radar systems and multifunction antenna systems, i... more Background. Talking about evolution of passive radar systems and multifunction antenna systems, it is necessary to acknowledge that distributed antenna systems (DAS) are supposed to be widely spread in the very near future in many areas of human activity, such as organization of high-quality mobile communication in large offices, shopping centers, fitness buildings and so on. Structurally, DAS consist of different groups of antennas and base stations with active and passive repeaters of radio signals. Generally, mutual location of such antennas and base stations can be chosen experimentally according to the criterion of service area maximization. For the further quality of service improvement, it is necessary to use smart antennas in DAS as basic structure elements. The use of smart antennas will allow tracking the subscriber`s (or SOR – source of radiation) location by means of direction-finding (DF) and to increase radiation power of radio signal towards SOR thus decreasing interference to other subscribers. It is important to note that amplitude methods of DF are unacceptable in this case because base stations have antenna beam patterns which are rather wide. Use of phase methods for direction finding is actual but constrained because of electromagnetic waves (EMW) multipath propagation and large DF errors caused by the following reason – it happens that SOR is located in Fresnel zone of direction-finder antenna system. So, consideration of the phenomenon of EMW front curvature in DAS is very important in order to construct direction-finders. Objective. Consideration of EMW phase front sphericity (curvature) and its influence on the accuracy of SOR coordinates determination measured by DAS phase methods. Scheme technical decisions of phase direction-finders (PDF) based on this process are also represented. Methods. To study the effect of the EMW phase front curvature on the accuracy of determining the coordinates of the SOR analytical dependencies are synthesized. Calculations of the direction characteristics, errors in determining the phase shifts between the antenna elements of the phase direction-finder, as well as the error in determining the distance to SOR in the Fresnel zone as a function of the range to SOR and its bearing were made based on MathCad 14 program. Results. During the process of SOR angular coordinates determination in Fresnel zone with use of EMW phase front curvature оn the basis of planar antenna array, it is necessary to execute consistently two operations: 1) to define the fact of presence of EMW phase front curvature; 2) to switch PDF from the mode of bearing and tilt angles estimation (when it is in plane phase front) to the mode of bearing and tilt angles estimation (and also distance to SOR if needed) with phase front curvature of EMW. Taking into account the analysis relating to errors of bearing angle measurements in Fresnel zone (depending on the location of rough, but exact bases, for three-element sparse LAA) it is possible to conclude that their position doesn't impact on exactness of bearing angle measuring in PDF. But to support more exact determination of SOR distance they must be placed in the center of exact, but ambiguous bases of PDF. Conclusions. Failure to take into account EMW phase front curvature from SOR harmonic signal leads to errors of SOR coordinate calculation under conditions of its location in Fresnel zone and absence of other SORs. Knowledge of distance to SOR can be used in passive radar systems, in radio monitoring systems of radio interference sources which have bearing angles equal with useful SOR ones, but located on different distances from useful SOR. This knowledge can also be used in mobile communication networks to strengthen signal level on certain distance with EMW energy focusing, in vehicle control systems on the basis of the satellite navigation systems etc.
Background. Currently digital microwave radio relay links operating in centimeter bands and in th... more Background. Currently digital microwave radio relay links operating in centimeter bands and in the lower part of millimeter bands (3.4-40.5 GHz) are widely used in the leading countries to construct their telecommunication infrastructure. Taking into account the lack of spectrum in these frequency bands and growing necessity to transmit high-rate applications with the help of brand-new radio relay equipment of the world leading manufacturers of such equipment, tendency to operate in higher parts of millimeter bands is becoming more real and practicable. At the same time, the terahertz band (100-3000 GHz) which is not used at the present time (because of complexity of construction of radio relay equipment that could operate in this band) is also very perspective for introduction of the future radio relay equipment (for the reason of high information capacity of 100-3000 GHz band). The Research Telecommunication Institute of the National Technical University of Ukraine and the Institute of Electronics and Communications of the Ukrainian Academy of Science developed the prototype of the transceiver for operation in the lower part of the terahertz band (130-132 GHz band). For this reason there was a necessity to conduct research concerning operation of the prototype in 130-132 GHz band (that is to test quality of operation of separate blocks of transceiver by changing parameters of transmitting signals passing through it). Objective. The purpose of the research is the parameters variation of multichannel digital broadcasting TV signals based on DVB-C standard when TV signal is transmitted through the 130 GHz transceiver prototype. DVB-C standard has been chosen for this research to have opportunity to analyze signals with different modulation schemes (from QAM-64 to QAM-256), which allowed investigating the influence of certain prototype node parameters on the signal parameters that were transmitted through it Methods. To conduct the research the experimental installation has been constructed with several parts in it (transceiver, subsystem for generation of DVB-C television signals, subsystem for measurement of DVB-C television signal parameters). The research has been conducted in three stages using a step-by-step approach with application of one-channel, two-channel and three-channel signals of DVB-C standard. Results. Results of the research showed that the use of the transceiver (that has common heterodyne for transmitting and receiving parts) in the lower part of terahertz band (130 GHz) permits to transmit three TV broadcasting channels of DVB-C standard in 24 MHz bandwidth with transmission rate of 125 Mbit/s with high subjective quality of all TV programs. Conclusions. The results of the research demonstrated high quality of digital TV signals transmission by means of transceiver constructed for application in terahertz band (130-132 GHz). The reason for such conclusion is that harmonic distortions have not been observed and phase noise of heterodyne has not led to significant channel symbols distortion on signal constellation. The next step in future research will include the research of the quality of DVB-C signal transmission for cases when terahertz radio link is used and specific heterodynes are applied in transmitting and receiving parts of the transceiver prototype. In the future the transceiver can be used for construction of digital microwave radio relay links in terahertz band for transmission and reception of digital TV signals with high rate both for broadcasting and other applications such as Internet.
2014 24th International Crimean Conference Microwave & Telecommunication Technology, 2014
Theoretical possibilities of increasing capacity of a single-interval radio relay line by means o... more Theoretical possibilities of increasing capacity of a single-interval radio relay line by means of the physical phenomenon of phase front curvature of electromagnetic waves are presented. Location of repeaters of radio relay stations (RRS) in Fresnel zone is the main condition. The scheme for implementation of this method and results of modeling distances (bases) up to additional antennas of repeaters of RRS for different signal/noise + interference ratio (SNIR) are shown as well.
2014 24th International Crimean Conference Microwave & Telecommunication Technology, 2014
The present paper concerns the circuit implementation of a phase radio direction finder for coord... more The present paper concerns the circuit implementation of a phase radio direction finder for coordinate determination of radiation sources with harmonic signals. The use of sparse linear antenna arrays and radiation source are examined. The feature of this radio direction finder is an ability to operate in the frequency band. The basic relations for the direction-finding characteristics, which allow providing the operation of the radio direction finder in the frequency range using measured wavelength and implementation of the demodulation unit on broadband quadrature bridges.
Practical methods for the measuring devices creation which allow determining new information para... more Practical methods for the measuring devices creation which allow determining new information parameter in the microwave systems - difference of the phase differences (double phase difference) are shown.
Microwave and Telecommunication Technology, 2006. CriMiCO '06. 16th International Crimean Conference, 2006
Structure scheme of the radiation sources discrimination system with using curvature of the front... more Structure scheme of the radiation sources discrimination system with using curvature of the front of the electromagnetic wave is shown with possibility of jammer suppression and its location determination
Microwave & Telecommunication Technology, 2005 15th International Crimean Conference, 2005
The possibility of interference suppression using difference in spherical waves of signal and int... more The possibility of interference suppression using difference in spherical waves of signal and interference is shown. Both interference level suppression and signal attenuation characteristics are presented.
There is an actual problem of finding new or improvement of the position determination methods (P... more There is an actual problem of finding new or improvement of the position determination methods (PDM) of the RS in the radio engineering systems (RES). There are many PDM methods in RES. But it is also submitted in the work about possibility of the location determination (bearing and range) using curvature of the electromagnetic wave front without showing mathematical formulas for its calculation. So the main object of this report to view PDM features with mathematical formulas for bearing and range of the RS derivation and its calculation error estimation by using curvature of the electromagnetic wave front.
Theoretical possibility of jammer and signal sources’ discrimination procedure is shown by using ... more Theoretical possibility of jammer and signal sources’ discrimination procedure is shown by using requirements for radiation sources discrimination system (SDS).
Space-time processing (STP) methods for interference cancellation and signal extraction using fou... more Space-time processing (STP) methods for interference cancellation and signal extraction using four-dimensional matrices are shown.
Peculiarities of the determination of location of the radiation source based on the curvature of ... more Peculiarities of the determination of location of the radiation source based on the curvature of the front of its electromagnetic wave are discussed.
Approaches and technical solutions used for determining coordinates of radiation source with harm... more Approaches and technical solutions used for determining coordinates of radiation source with harmonic signal located in intermediate zone (Fresnel zone) of linear antenna array that is a part of phase coordinates determination system are considered.
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Papers by Gleb Avdeyenko