Using wireless high-speed communication channels to solve automation problems at the fields of Udmurtneft JSC

2020 ◽  
pp. 82-87
Author(s):  
S.G. Mukhametdinova ◽  
◽  
A.I. Korshunov ◽  
A.S. Trefilov ◽  
◽  
...  
Keyword(s):  
High Speed ◽  
Communication Channels

Increasing Noise Immunity of Electric Communication Channels in High-speed Telecommunication Systems

2014 ◽  
Vol 11 (Spl Edition Nov. 14) ◽  
pp. 277-279 ◽  
Author(s):  
Vladimir Mikhailovich Artyushenko ◽  
Tatyana Sergeevna Abbasova
Keyword(s):  
High Speed ◽  
Noise Immunity ◽  
Communication Channels ◽  
Telecommunication Systems

scholarly journals OPTIMIZATION OF THE STRUCTURE OF A MULTI-FREQUENCY MODEM

T-Comm ◽  
2021 ◽  
Vol 15 (6) ◽  
pp. 10-19
Author(s):  
Andrey V. Alyoshintsev ◽  
Keyword(s):  
Energy Efficiency ◽  
Spectral Efficiency ◽  
Data Transmission ◽  
High Speed ◽  
Communication Channels ◽  
Digital Transmission ◽  
Transmission System ◽  
Limited Communication ◽  
High Speed Data ◽  
Speed Data Transmission

The paper considers the solution to the problem of increasing the spectral efficiency of a digital transmission system with multifrequency modulation and optimal finite signals that do not cause intersymbol interference in various channels of a multifrequency modem. Applying the method of multi-frequency data transmission based on two-dimensional signal processing, high-speed data transmission is organized over frequency-limited communication channels based on wired technologies of the xDSL standard. The well-known and new modem, which is superior in efficiency to similar modems, are presented. In this paper, the modernization of a multifrequency modem with optimal finite signals based on quadrature amplitude modulation (QAM) is considered. The peculiarity of this structure is as follows: the use of new, synthesized optimal finite OFS-2 signals with increased noise immunity; in the application of the new structure of the multi-frequency modem MFM3; in the use of a frequency-limited GCS in the UEP DCS at the reception in order to compensate for the amplitude and phase distortions introduced by it. Comparative results of calculations of the spectral-energy efficiency of the considered multi-frequency modulated modem MFM3 with OFS-2 and narrow-band subcarriers are illustrated by the graphs in Fig. and presented in Table . Implementation of the new modem in digital telecommunications systems will significantly increase their spectral efficiency. The proposed approach can be used to organize high-speed data transmission over frequency-limited communication channels based on wired technologies of the xDSL standard. For the first time, an adaptive multi-channel digital transmission system with a new multi-frequency modem and new optimal second-type finite signals with increased spectral and energy efficiency has been developed, taking into account optimal estimates of the parameters of the direct communication channel transmitted via the feedback channel and used both in transmission (in the modulator) and reception (in the demodulator).

Using wireless high-speed communication channels to solve automation problems at the fields of Udmurtneft JSC

2020 ◽  
pp. 120-122
Author(s):  
S.G. Mukhametdinova ◽  
◽  
A.I. Korshunov ◽  
A.S. Трефилов ◽  
◽  
...  
Keyword(s):  
High Speed ◽  
Communication Channels

Complex-Valued Neural Networks for Equalization of Communication Channels

2009 ◽  
pp. 168-193
Author(s):  
Rajoo Pandey
Keyword(s):  
Neural Networks ◽  
Recurrent Neural Networks ◽  
High Speed ◽  
Communication Channels ◽  
Training Sequence ◽  
Multipath Channels ◽  
Multidimensional Space ◽  
High Speed Data ◽  
Complex Valued ◽  
New Algorithms

The equalization of digital communication channel is an important task in high speed data transmission techniques. The multipath channels cause the transmitted symbols to spread and overlap over successive time intervals. The distortion caused by this problem is called inter-symbol interference (ISI) and is required to be removed for reliable communication of data over communication channels. In this task of ISI removal, the signals are complex-valued and processing has to be done in a complex multidimensional space. The growing interest in complex-valued neural networks has spurred the development of many new algorithms for equalization of communication channels in the recent past. This chapter illustrates the application of various types of complex-valued neural networks such as radial basis function networks (RBFN), multilayer feedforward networks and recurrent neural networks for training sequence-based as well as blind equalization of communication channels. The structures and algorithms for these equalizers are presented and performances based on simulation studies are analyzed highlighting their advantages and the important issues involved.

Microfabrication research at the National Submicron Facility

1983 ◽  
Vol 41 ◽  
pp. 86-89
Author(s):  
E.D. Wolf
Keyword(s):  
Integrated Circuits ◽  
Particle Physics ◽  
High Speed ◽  
New Technology ◽  
High Energy ◽  
High Energy Particle ◽  
New Science ◽  
Wide Range ◽  
Intermediate Domain ◽  
Circuit Function

Most microelectronics devices and circuits operate faster, consume less power, execute more functions and cost less per circuit function when the feature-sizes internal to the devices and circuits are made smaller. This is part of the stimulus for the Very High-Speed Integrated Circuits (VHSIC) program. There is also a need for smaller, more sensitive sensors in a wide range of disciplines that includes electrochemistry, neurophysiology and ultra-high pressure solid state research. There is often fundamental new science (and sometimes new technology) to be revealed (and used) when a basic parameter such as size is extended to new dimensions, as is evident at the two extremes of smallness and largeness, high energy particle physics and cosmology, respectively. However, there is also a very important intermediate domain of size that spans from the diameter of a small cluster of atoms up to near one micrometer which may also have just as profound effects on society as “big” physics.

Vacuum System to Minimize the Specimen Contamination of High-Performance EM

1977 ◽  
Vol 35 ◽  
pp. 68-69
Author(s):  
N. Yoshimura ◽  
K. Shirota ◽  
T. Etoh
Keyword(s):  
Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
High Vacuum ◽  
Vacuum System ◽  
Pump System ◽  
Pumping System ◽  
Diffusion Pump ◽  
Almost All ◽  
Cascade Type

One of the most important requirements for a high-performance EM, especially an analytical EM using a fine beam probe, is to prevent specimen contamination by providing a clean high vacuum in the vicinity of the specimen. However, in almost all commercial EMs, the pressure in the vicinity of the specimen under observation is usually more than ten times higher than the pressure measured at the punping line. The EM column inevitably requires the use of greased Viton O-rings for fine movement, and specimens and films need to be exchanged frequently and several attachments may also be exchanged. For these reasons, a high speed pumping system, as well as a clean vacuum system, is now required. A newly developed electron microscope, the JEM-100CX features clean high vacuum in the vicinity of the specimen, realized by the use of a CASCADE type diffusion pump system which has been essentially improved over its predeces- sorD employed on the JEM-100C.

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