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Calibration of a Planar Scanner for Near-field Antenna Measurements

Calibration of a Planar Scanner for Near-Field Antenna Measu...

引用

2020 systems of signals generating and processing in the field of on board communications

作者： Snastin, M.V. Dobychina, E.M. Moscow Aviation Institute National Research University Moscow Russia

ISBN: (纸本)9781728147727

The main goal of the work is to increase the near field measurement accuracy of antennas characteristics by performing calibration of planar scanner. This becomes possible when using the phaseless switching method for the diagnostics of amplitude and phase scanning errors. The novelty of the proposed solution lies in the fact that the phase state changing of the channel under calibration is performed without the usage of phase shifters by digital methods only. During the research process a simulation model of the calibration process was developed. That model was shown the convergence of the algorithm for any values of phase and amplitude errors. Special software for automatic estimation of measurement errors was developed. Experimental studies of a planar scanner in an anechoic chamber were carried out. The obtained results turn it possible to reduce the amplitude and phase measurement errors in the process of moving the scanner to values corresponding to the industrial standards of high-end devices. © 2020 IEEE.

关键词： Calibration

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Construction of a Communication Channel with UAVs Based on Direct Sequence Spread Spectrum signals

Construction of a Communication Channel with UAVs Based on D...

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2024 systems of signals generating and processing in the field of on board communications, SOSG 2024

作者： Chirov, D.S. Lobov, E.M. Chertova, O.G. Bazylev, M.V. Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (纸本)9798350383614

Unmanned aerial vehicles (UAV) are actively used to solve various problems: monitoring the earth's surface, delivering goods, relaying signals, special military tasks, etc. A feature of UAV monitoring of the earth's surface is the need to transmit the video stream recorded by the on-board optical-electronic system of the device to a ground control point in real time. To transmit high-quality video, a radio channel with high information transmission speed is required. The construction of such communication channels is possible through the use of signals with complex signal-code structures. One of the ways to increase the efficiency of information transmission and construct complex signal-code structures is to use the method of expanding the signal spectrum. This article discusses the option of building a communication channel with medium-range unmanned aerial vehicles based on direct sequence spread spectrum (DSSS) signals. It has been shown that it is possible to build a communication channel with a UAV with a speed of up to 150 Mbit/s on a range of more than 100 km when using not very long pseudorandom sequence (PRS). The use of longer PRS will significantly reduce the communication range, but will significantly increase the energy secrecy of the channel, which is important for special-purpose UAVs. ©2024 IEEE.

关键词： Spectrum efficiency

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Modeling of Nonlinear Distortions in 5G NR systems

Modeling of Nonlinear Distortions in 5G NR Systems

引用

2021 systems of signals generating and processing in the field of on board communications, SOSG 2021

作者： Kulygin, S.V. Kazachkov, V.O. Moscow Aviation Institute National Research University Moscow Russia

ISBN: (纸本)9780738130897

Due to the peculiarities of the physical level of 5G NR (Fifth Generation New Radio) systems, nonlinear distortion of the amplifying path is one of the main negative affecting on the signal. Existing mathematical models of amplifier nonlinearities in the context of their application in the simulation of fifth-generation signals require adaptation. The work proposes the coefficients for nonlinear distortion of power amplifiers for Saleh and Ghorbani models. Based on the simulation model developed in MA TLAB, the spectral characteristics of the simulated processes of nonlinear distortion, amplitude-amplitude and amplitude-phase distortions, as well as the effect of nonlinearity on the noise immunity of the system (the dependence of the bit error rate (BER) from the signal-to-noise ratio (SNR)) for the 5G NR signal of the second numerology (200 MHz signal bandwidth) for all types of modulation supported by the standard on sub carrier frequencies (QPSK, 16QAM, 64QAM, 256QAM) are studied. © 2021 IEEE.

关键词： Bit error rate

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Optimal traffic routing in radiofrequency applications using machine learning

Optimal traffic routing in radiofrequency applications using...

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2018 systems of signals generating and processing in the field of on board communications

作者： Kondybayeva, Almagul Baurzhanovna Ositis, Anastasia Petrovna Kalashnikov, Evgeniy Alexandrovich Department of Automated Control Systems National University of Science and Technology 'Misis' Leninsky Prospect 4 Moscow119991 Russia International Telecommunication Academy Line 2-name of Organization Acronyms Acceptable ul. Prechistenka 4 b. 2 Moscow119034 Russia

ISBN: (纸本)9781538656228

At present, the problem of switching from traditional circuit-switched networks to packet-switched networks (NGN) is one of the most urgent for telecom operators in radiofrequency applications. Perspective developments in the field of IP communications are connected with the creation of integrated solutions that allow the development of next-generation networks to maintain existing connections and ensure uninterrupted operation in any telephone access network: on the infrastructure of copper pairs, through optical channels, wireless (WiMAX, WiFi) and wired (ETTH, PLC and etc.) of the network. According to the concept of 'non-destructive' transition to NGN, such solutions should allow point-to-point transfer of certain segments to new technologies in radiofrequency applications without drastically changing the entire structure of the network. In particular, solutions for a 'nondestructive' transition to NGN must meet the following requirements: • Integration into the existing network of the operator, support not only for new transport technology, but also for the familiar management model;• Fully modular architecture with the capabilities of geographical distribution and redundancy;• The ability to flexibly increase productivity by purchasing licenses and adding servers to the system;• The possibility of introducing new types of services in the shortest possible time;• Compliance with the requirements of the legislation on network architecture [1-5]. Routing to date is determined not by formal rules and descriptions typical of networks of previous generations, but by customer requirements and economic considerations of the telecoms operator. To optimize the operation of networks in radiofrequency applications, various routing methods are being developed, ensuring a balanced load of all network resources. Among foreign scholars studying this problem, it is worthwhile to highlight D. Awduche, J. Malcolm, J. Agogbua, M. O'Dell, J. McManus, S. Hiroyuki, M. Yasuhiro, Y. M

关键词： Network routing

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Research of the Influence of Nonlinearity of Capacitance-Voltage Characteristics of field-Effect Transistors on Nonlinear Distortions in Distributed Amplifiers

Research of the Influence of Nonlinearity of Capacitance-Vol...

引用

2021 systems of signals generating and processing in the field of on board communications, SOSG 2021

作者： Ivanyushkin, R.Y. Shmakov, N.D. Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (纸本)9780738130897

The model of distributed power amplifier, built on field-effect transistors of model MRF 9045, is presented. AM -AM characteristic and AM - PM characteristic investigated on the basis of this amplifier circuit are presented. The construction of a distributed power amplifier circuit for simplified modeling of parametric nonlinear distortion is discussed. Simplified models of this type of amplifiers for the HF and UHF ranges are given. In a simplified model for the HF range, the parametric capacitances are built on the basis of the capacitance-voltage characteristics on the field-effect transistor of model BLF 278. In the simplified model for the UHF range, the parametric capacitances are built on the basis of the capacitance-voltage characteristics on the field-effect transistor of model MRF 9045. The features of constructing a simplified model of a distributed gain amplifier are discussed. On the basis of simplified models of parametric nonlinear distortion amplifiers, several cases of the influence of parametric capacitances are investigated such as: the influence of the input parametric capacitance, as well as the influence of the output parametric capacitance. The result of the research is the amplitude and phase-amplitude characteristics. The reasons for parametric nonlinear distortions and methods of their linearization are discussed. Further research tasks are presented. © 2021 IEEE.

关键词： Power amplifiers

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High Efficiency Power Amplifier for IoT Applications: RF Path

High Efficiency Power Amplifier for IoT Applications: RF Pat...

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2020 systems of signals generating and processing in the field of on board communications

作者： Varlamov, O.V. Gromorushkin, V.N. Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (纸本)9781728147727

IoT devices must remain operational for 10 years with one set of batteries. Most power is typically consumed by an RF power amplifier, which is necessary for transmitting data over a wireless radio channel in 5G networks. For this reason, the task of increasing the efficiency of an RF power amplifier is relevant. High efficiency can be achieved by using active element switching modes in combination with 'synthetic' amplification methods. This article analyzes the energy characteristics of a Class D switching power amplifier with a filter for two configurations: voltage mode and current mode for various transistor saturation times (Duty Ratio). Based on the analysis of time diagrams, integral equations are written, the solution of which allows us to derive calculation formulas. The results of calculations are presented. It is shown that the mode of working with meanders is most advantageous, while the VMCD circuit should work at τsat≤π, and in the CMCD circuit should work at τsat≥π. © 2020 IEEE.

关键词： 5G mobile communication systems

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Monitoring of RF-field Strength in the Environment by Mobile Telecommunications in the Moscow

Monitoring of RF-Field Strength in the Environment by Mobile...

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2023 systems of signals generating and processing in the field of on board communications, SOSG 2023

作者： Yelizarov, A.A. Ikonnikova, D.M. Katsnelson, A.I. Gromova, P.I. Ilyanova, D.S. National Research University Higher School of Economics Moscow Russia

ISBN: (纸本)9798350397727

The growing popularity and use of the wireless Internet of Things and cyber-physical systems increase the demand for "green"technologies in the field of mobile telecommunications. To be completely wireless, such devices need an integrated RF energy harvesting system that ensures efficient recharging of the batteries and accumulators used in them. This article provides an assessment of the coverage areas of mobile operators in Moscow and the Moscow region by the frequency ranges used, taking into account the power distribution. An experimental study of the RF-field strength of telecommunication equipment was carried out using a log periodic antenna (KM6-600/6000) with linear polarization and a portable spectrum analyzer with an Arinst SSA-TG R2 tracking generator. The results of attenuation of electromagnetic waves of GSM and Wi-Fi bands under various environmental conditions are obtained, which is of interest for the development of effective intelligent harvesting systems. © 2023 IEEE.

关键词： Energy harvesting

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Analysis of the Effect of Multiplicative Noise on the Patterns of Phased and Synthesized Antenna Arrays

Analysis of the Effect of Multiplicative Noise on the Patter...

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2023 systems of signals generating and processing in the field of on board communications, SOSG 2023

作者： Volovach, V.I. Artyushenko, V.M. Volga Region State University of Service Informational and Electronic Service Department Togliatty City Russia Technological University Information Technology and Management Systems Department Korolev City Russia

ISBN: (纸本)9798350397727

The influence of multiplicative noise on the directional patterns of phased and synthesized antenna arrays is analyzed. Multiplicative noise is regarded as a source of fast phase and amplitude distortion of signals received or radiated by the antenna. It is shown that multiplicative noise changes the multiplier of the array. Expressions of the directional pattern of the phased array exposed to multiplicative noise are obtained, taking into account the aperture distribution of phasing errors, as well as a generalized directional pattern of the array with phase shifters. The features of arrays with delay lines are described, and an expression for determining the directional pattern of such arrays is obtained. The features of synthesized antenna arrays are considered. The directional pattern of a focused antenna array under the influence of multiplicative noise is analyzed. Expressions for the directional pattern are obtained taking into account the time of the relative delay of signal reception relative to the central element of the array. It is shown that the obtained expressions for the phased antenna array and the array with phase shifters are also valid for synthesized antenna arrays. © 2023 IEEE.

关键词： Phase shifters

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Measuring Far-field Radiation Patterns of Digital Beamforming Antenna Arrays

Measuring Far-Field Radiation Patterns of Digital Beamformin...

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2024 systems of signals generating and processing in the field of on board communications, SOSG 2024

作者： Djigan, V.I. Department of Integrated Circuits Design Methodology Institute for Design Problems in Microelectronics of RAS Moscow Russia

ISBN: (纸本)9798350383614

A method of the antenna array far-field Radiation Pattern (RP) measurement is considered. This method is designed for the usage with the receiving Digital Beamforming Antenna Arrays (DBAA). Such type of antenna arrays typically does not have a radiofrequency output. Hence, the standard methods of the RP measurement, based on the radiation and the reception of the monochromatic probing signal, cannot be used for the DBAA RP measurement. The proposed method assumes the radiation of a probing signal modulated by a pseudo-noise sequence and the base-band processing of the DBAA output signal by means of a matched filter or a correlator. The paper presents the description of the measurement setup and the mathematical explanation of the measuring procedure. It has been shown that the accuracy of the RP measurement depends on the Signal-to-Noise Ratio (SNR) at the outputs of the DBAA channel receivers, the number of the array channels and the number of the pseudo-noise sequence symbols. The accuracy increases on 3 dB each time as the number of the array antennas or the pseudo-noise sequence symbols is doubled. This result is confirmed by the simulation of the RP measurement of the eight and the sixteen channel linear antenna arrays with the usage of the maximum length pseudo-noise sequence of 1023 and 2047 symbols. ©2024 IEEE.

关键词： Beamforming

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Detection of signals with a Random Moment of Occurrence Using the Cumulative Sum Algorithm

Detection of Signals with a Random Moment of Occurrence Usin...

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2021 systems of signals generating and processing in the field of on board communications, SOSG 2021

作者： Volovach, V.I. Artyushenko, V.M. Volga Region State University of Service Togliatty Russia Technological University Korolev Russia

ISBN: (纸本)9780738130897

A method for detecting signals with a random moment of occurrence based on the algorithm of cumulative sums with a reflecting screen under the influence of non-Gaussian noise is presented. An example of detecting a signal exposed to non-Gaussian quasi-deterministic additive noise is used for obtaining the dependences of the probability of false detection on the value of the signal-to-noise ratio for different values of the detection threshold. An increase in the detection threshold value, as well as the value of the signal-to-noise ratio, leads to a decrease in the probability of false detection. It is shown that the case of coordinated noise has the highest probability of correct detection. The algorithm for detecting a signal against the background of pulse noise and fluctuating non-Gaussian noise is analyzed and curves for probability of correct detection are obtained. It is found that the mismatch of the cumulative sum algorithm and the real density of probability distribution of noise leads to a decrease in the probability of correct detection. It is shown that the cumulative sum algorithm allows not only to solve the problem of detecting a signal in real time, but is also simple enough to be used when solving some practical problems. © 2021 IEEE.

关键词： Probability density function

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