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High Efficientcy 1.5 kW LDMOS HF Broadband Radio Transmitter

High Efficientcy 1.5 kW LDMOS HF Broadband Radio Transmitter

引用

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

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

ISBN: (纸本)9780738130897

The design of HF radio transmitters with a power more than 300W requires the use of summing devices that combine the powers of individual amplifiers. The use of combiners leads to the complication of the transmitter and increase its dimensions and weight, which is very critical for onboard equipment. Attempts to develop a broadband amplifier with a power 1500... 1800 W on a modern LDMOS transistor revealed certain difficulties associated with the parasitic parameters of a powerful amplifier. To achieve high output power of a transistor amplifier, it is necessary to reduce the load resistance of the output circuit of the final stage. In this case, the negative influence of the parasitic parameters of the output oscillatory circuit increases. The dissipation inductance of the transformer-short circuit and the mounting inductance in a class AB linear amplifier cause an increased voltage level of the even harmonics of the oscillatory voltage at the transistor drains, which reduces the attainable power of the amplifier while maintaining its safe mode of operation. The energy stored in parasitic inductances in switching amplifiers can lead to the destruction of transistors by self-induction voltage. In this article, we propose a mode of operation of transistors in a switching mode, which ensures high energy efficiency and full use of transistors in terms of power. The proposed mode can be successfully applied as part of an amplifier implemented using the Envelope Elimination and Restoration method (EER, also known as the Kahn technique). This method are most preferred for use in onboard devices where the supply power is limited. © 2021 IEEE.

关键词： Power amplifiers

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Constellations of Discrete Modulation Laws that have the Maximum Information Capacity per Symbol under Peak Power Limitation

Constellations of Discrete Modulation Laws that have the Max...

引用

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

作者： Shorin, O.A. Shorin, A.O. Bokk, G.O. Moscow Technical University of Communications and Informatics Moscow Russia Ojsc NIRIT-XINWEI Telecom Technology Moscow Russia

ISBN: (纸本)9780738130897

Calculation was made of optimal structures for constellations of discrete modulation where the maximum information quantity is provided per one symbol. Results were achieved for regular practical application conditions with limitation on the peak power of the transmitted signal. It is established that multi-ring constellations with a different number of points on each of the rings are optimal. It is shown that with an increase in the signal-to-noise ratio, the optimal multi-ring structure of constellation undergoes changes consisting in a gradual increase in the radii of the inner rings, the appearance of new positions in the vicinity of the center of the constellation and an increase in the total number of constellation points. Rings located farther from the center of the constellation always have a larger number of points than rings located closer to the center. It is found that the typical QPSK modulation, starting with a signal-to-noise ratio of 5 dB, loses to the optimal constellations in terms of the information capacity of a single symbol by a value of 0.67 dB or more in the representation of effective losses for the useful signal level. Is found that the information capacity of the optimal multi-ring constellation practically does not depend on the initial phases of the uniform points positions distributions on rings. It is also established that for each signal-to-noise ratio there is a minimum value of points of the optimal constellation starting from which the information capacity not increase. © 2021 IEEE.

关键词： Quadrature phase shift keying

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Two-Frequency Reflectometric Initialization of the Upstream Central Wavelength in Transport WDM-PON Domain for 5G Mobile Radio Access Networks

Two-Frequency Reflectometric Initialization of the Upstream ...

引用

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

作者： Morozov, O.G. Makarov, I.A. Vasilets, A.A. Sarvarova, L.M. Alushina, S.G. Kazan National Research Technical University Named after A.N. Tupolev-KAI Kazan Russia Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (纸本)9780738130897

Tuning the wavelength of a colorless laser transmitter, used to build an upstream channel in the WDM-PON transport domain of a 5G mobile radio access network, to the wavelength of the maximum transmission of its multiplexer channel is implemented by a number of regulated and proactive procedures. The first include the procedures associated with the construction of the AMCC control and management channel, regulated by the ITU-T G.989.3 recommendation. The second is the construction of systems with probing of the complete structure of the ascending channel of the pass and reflective types. The main attention in the article will be paid to the consideration of reflective type systems. Broadband and single-frequency reflective methods for tuning direct modulation lasers: VSCEL, DFB, DBR, and external modulation lasers: integral module on InP-substrate, with direct detection and heterodyne reception are analyzed, their advantages and disadvantages are determined. The transition to modulation reflectometric methods of tuning is substantiated, for which one-, two- and three-frequency technologies for multiplexer probing based on EML lasers with scanning are proposed. The use of both latter methods makes it possible to increase the signal-to-noise ratio, sensitivity and accuracy of multiplexer spectral characteristics measurements, and, consequently, the accuracy of tuning the wavelength of a colorless laser transmitter to the central wavelength of one of multiplexer channels. © 2021 IEEE.

关键词： Indium phosphide

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The Concept of a Multi-Beam Radar in the Smart City Air Traffic Control System

The Concept of a Multi-Beam Radar in the Smart City Air Traf...

引用

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

作者： Lavrov, A.A. Antonov, I.K. Ovchinnikov, V.G. Nikonenko, A.V. Chirov, D.S. BG-Optics Moscow Russia Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (纸本)9780738130897

The article provides insight into the technical implementation and characteristics of a multi-beam surveillance radar designed to work as part of the small-sized unmanned aerial vehicle traffic control complex in a 'smart city'. In the article, it is pointed out that the advantages of this type of radar are a long range, resistance to weather conditions, quick changeover of the frame in a wide scanning area. The proposed technical concept is the one of the radar, which provides detecting drones at a range of up to 10 km. The description includes the design of the receiving phased array antenna and the structure of the receiving channel. The requirements for the dynamic range of the receiver are well justified, and the need to use automatic gain time control to expand the scan area in the range is clearly illustrated. The required parameters and characteristics of the equipment mainly correspond to the existing models of survey radars and the models being developed and are quite achievable with a modern technical base. The article presents characteristics of a multi-beam radar experimental sample and the results of its tests at observing drones. The tests have proven the predicted characteristics, and demonstrated the ability to effectively suppress reflections from the ground, as well as gave credence to the calculated detection range parameters and the strong immunity of the radar to bad weather conditions. The materials provided in the article are supported with the radar images received in course of the experiments. © 2021 IEEE.

关键词： Air traffic control

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Features of the Data Modeling Method of the Composite Filter Algorithm

Features of the Data Modeling Method of the Composite Filter...

引用

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

作者： Chernova, I.V. Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (纸本)9780738130897

Methods for modeling input data for the filter of statistical processing of target motion parameters are considered. The inputs are measurements some coordinates of the phase vector and variance or standard deviations of these measurements. When debugging the filter in laboratory conditions, these the inputs are commonly referred to as the measurement model and the error model of those measurements. It is very important that these models are as close as possible to real measurements and their standard deviations. The closer the model is to real data, the more accurate the filter will work, although of course, no model can match the actual data perfectly. For this reason, always after testing on model data, the transition to real data entails some deterioration in the filter's performance. To this circumstance it is necessary to be ready and perhaps it makes sense in laboratory tests to lay the features of real work, when situations are possible when measurements do not come at all, and the standard deviations take on abnormally high values. In this article discusses measurement models in an additive form - an exact value plus a normally distributed random variable with zero mathematical expectation and some standard deviations. These random variables are independent as the coordinates of one vector and independent with respect to the coordinates of another vector one random process. Such a model of errors is due to the presence of many factors independently introducing an error (interference) and their summation. The article discusses the methodology for obtaining the root-mean-square measurement by the true coordinates and obtaining a measurement model based on these standard deviations. The standard deviation model for each the radar station can have its own, and therefore it is important to know which station will track the target. When designing an escort filter, it is important also test it with different standard deviation models. The modeling features of the

关键词： Kalman filters

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Power Efficient Real-Time Traffic Signal Classification for Autonomous Driving Using FPGAs

Power Efficient Real-Time Traffic Signal Classification for ...

引用

International conference on communications, Signal processing, and their Applications (ICCSPA)

作者： Rashed Al Amin Md Shahi Amran Hossain Leon Tjard Schmid Veit Wiese Roman Obermaisser Institute for Embedded Systems University of Siegen Siegen Germany

ISBN: (数字)9798350384819

ISBN: (纸本)9798350384826

The significant advancements in research within the domain of Advanced Driver-Assistance systems (ADAS) have been significantly propelled by the integration of Artificial Intelligence (AI) and Deep Learning (DL). The detection and classification of traffic signals are pivotal for ensuring driver safety and comfort, prompting the development of numerous detection and classification methodologies in recent times. Convolutional Neural Networks (CNNs) and field Programmable Gate Arrays (FPGAs) have individually demonstrated notable efficacy in signal processing, image detection, and image classification tasks. However, the amalgamation of CNNs and FPGAs for traffic signal classification offers enhanced flexibility, accuracy, and resource efficiency. This study proposes a software-hardware co-design approach for the development of a resource-efficient real-time traffic signal classification system tailored for FPGAs utilizing the CNN algorithm. The software implementation has been carried out within the TensorFlow framework, while the hardware implementation is executed via the Xilinx Vivado 2023.1 platform and rigorously evaluated using the Xilinx ZCU102 FPGA board. Experimental findings demonstrate that the traffic signal classification accuracy can attain approximately 99.98% at a frame rate of 84139 frames per second (FPS) on the FPGA platform, with a power consumption of 4.4W. The exceptionally low latency and heightened accuracy exhibited by the proposed system render it highly advantageous for ADAS and other safety-critical applications.

关键词： Accuracy Software algorithms Pattern classification Signal processing algorithms Real-time systems Software Safety Convolutional neural networks Artificial intelligence field programmable gate arrays

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Near-field Measurement System for the Upper Mid-Band

Near-Field Measurement System for the Upper Mid-Band

引用

Asilomar conference on signals, systems & Computers

作者： Ali Rasteh Raghavendra Palayam Hari Hao Guo Marco Mezzavilla Sundeep Rangan Tandon School of Engineering New York University Brooklyn NY USA Department of Electrical Engineering Chalmers University of Technology Gothenburg Sweden Dipartimento di Elettronica Informazione e Bioingegneria (DEIB) Politecnico di Milano Milan Italy

ISBN: (数字)9798350354058

ISBN: (纸本)9798350354065

The upper mid-band (or FR3, spanning 6–24 GHz) is a crucial frequency range for next-generation mobile networks, offering a favorable balance between coverage and spectrum efficiency. From another perspective, the systems operating in the near-field in both indoor environment and outdoor environments can support line-of-sight multiple input multiple output (MIMO) communications and be beneficial from the FR3 bands. In this paper, a novel method is proposed to measure the near-field parameters leveraging a recently developed reflection model where the near-field paths can be described by their image points. We show that these image points can be accurately estimated via triangulation from multiple measurements with a small number of antennas in each measurement, thus affording a low-cost procedure for near-field multi-path parameter extraction. A preliminary experimental apparatus is presented comprising 2 transmit and 2 receive antennas mounted on a linear track to measure the 2 × 2 MIMO channel at various displacements. The system uses a recently-developed wideband radio frequency (RF) transceiver board with fast frequency switching, an FPGA for fast baseband processing, and a new parameter extraction method to recover paths and spherical characteristics from the multiple 2 × 2 measurements.

关键词： Antenna measurements Switches Apertures Reflection MIMO Transceivers Frequency measurement Velocity measurement Wideband Parameter extraction

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Multi-Station Access Based on signals with Non-Harmonic Subcarriers

Multi-Station Access Based on Signals with Non-Harmonic Subc...

引用

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

作者： S. F. Gorgadze T. M. Gut D. V. Dzhurin Moscow Technical University of Communications and Informatics Moscow Russia

The following topics are dealt with: road traffic; transportation; optimisation; road vehicles; probability; traffic engineering computing; telecommunication traffic; road safety; fibre optic sensors; and radio receiv... 详细信息

关键词： Location awareness Correlation Constellation diagram Frequency modulation Frequency-domain analysis Communication channels Bandwidth

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Fractional Power Spectrums in Diagnostics of On-board Electronic Equipment of Monitoring, Measuring and Temperature Regulating systems

Fractional Power Spectrums in Diagnostics of On-Board Electr...

引用

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

作者： Afanasiev, V.V. Loginov, S.S. Kazan National Research Technical University Named after A. N. Tupolev - KAI Kazan Russia

ISBN: (纸本)9781728147727

In this work, the development and research of the method and means of technical diagnostics of electronic equipment of the on-board monitoring, measuring and regulating temperature systems with thermocouple sensors according to fractional power spectra of signals were performed. The physical processes that cause typical malfunctions of low-frequency onboard electronic equipment with thermocouple sensors are investigated. Peculiarities of non-harmonic spectral analysis of signals and diagnostics of low-frequency electronic equipment of on-board systems for monitoring, measuring and regulating temperatures systems by fractional power spectra of signals are considered. © 2020 IEEE.

关键词： Power spectrum

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Artificial Intelligence for Information Security

Artificial Intelligence for Information Security

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

作者： Erokhin, S.D. Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (纸本)9781728147727

The article analyzes the possibilities of using artificial intelligence technologies to ensure information security. The advantages of using machine learning for processing information security events are shown. A review of modern commercial information protection products that use artificial intelligence technologies is conducted. © 2020 IEEE.

关键词： Support vector machines

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