scholarly journals Simulation model of the transmission path for 5G NR base station

2020 ◽  
Vol 23 (3) ◽  
pp. 38-44
Author(s):  
A. K. Movchan ◽  
◽  
E. V. Rogozhnikov ◽  
E. M. Dmitriev ◽  
S. A. Novichkov ◽  
...  
Keyword(s):  
Base Station ◽  
Design Environment ◽  
Software Environment ◽  
Nonlinear Parameters ◽  
Fifth Generation ◽  
Input And Output ◽  
Amplifier Model ◽  
Nonlinear Amplifier ◽  
Measurement Results ◽  
Vector Magnitude

The article presents the results of modeling an analog radio path of a fifth-generation cellular base station in the NI AWR Design Environment. The validation of the power amplifier model was performed in the AWR software environment. The validation is based on the comparison of measurement results for the nonlinear parameters of the amplitude characteristics of the microwave amplifier obtained on the amplifier model, with the results obtained during mathematical modeling of the nonlinear amplifier. The results of measuring the vector magnitude error between the input and output signals in the radiopath model are presented.

HYGIENIC ASSESSMENT OF ELECTROMAGNETIC RADIATION LEVELS OF BASE STATIONS,INSTALLED ON THE ROOFS OF BUILDINGS AND THE TERRITORY OF LAND PLOTS IN TASHKENT

2021 ◽  
Vol 2 (5) ◽  
pp. 5-11
Author(s):  
G. A. Tashpulatova ◽  
◽  
A. N. Krasavin
Keyword(s):  
Public Health ◽  
Electromagnetic Radiation ◽  
Flux Density ◽  
Energy Flux ◽  
Mobile Communications ◽  
Base Station ◽  
Base Stations ◽  
Cellular Communications ◽  
Measurement Results ◽  
Energy Flux Density

This article is about instrumental measurements of the FR EMR energy flux density. The measurement results were analyzed with the division of the data obtained by the purpose of buildings and the height of the antenna equipment placement, a hygienic assessment of the RF EMR levels created by the equipment of base stations of cellular communications, installed on the roofs of residential and public buildings and adjacent territories of Tashkent is given. A proposal is made on the rational placement of radio engineering facilities.Keywords:electromagnetic field; electromagnetic safety; base station for mobile communications; protection of public health; sanitary supervision

scholarly journals On the performance of non-orthogonal multiple access (NOMA) using FPGA

2020 ◽  
Vol 10 (2) ◽  
pp. 2151
Author(s):  
Mohamad Abdulrahman Ahmed ◽  
Khalid F. Mahmmod ◽  
Mohammed M. Azeez
Keyword(s):  
Gaussian Noise ◽  
Interference Cancellation ◽  
Multiple Access ◽  
Additive White Gaussian Noise ◽  
Base Station ◽  
Rate Performance ◽  
Allocation Mechanism ◽  
Close Match ◽  
Fifth Generation ◽  
Field Programmable

In this paper,  non-orthogonal multiple access (NOMA) is designed and implemented for the fifth generation (5G) of multi-user wireless communication.  Field-programmable gate array (FPGA) is considered for the implementation of this technique for two users. NOMA is applied in downlink phase of the base-station (BS) by applying power allocation mechanism for far and near users, in which one signal contains the superposition of two scaled signals depending on the distance of each user from the BS.  We assume an additive white Gaussian noise (AWGN) channel for each user in the presence of the interference due to the non-orthogonality between the two users’ signals. Therefore, successive-interference cancellation (SIC) is exploited to remove the undesired signal of the other user. The outage probability and the bit-error rate performance are presented over different signal-to-interference-plus-noise ratio (SINR). Furthermore, Monte-Carlo simulations via Matlab are utilized to verify the results obtained by FPGA, which show exact-close match.

scholarly journals Base Station Selection for Hybrid TDOA/RTT/DOA Positioning in Mixed LOS/NLOS Environment

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4132
Author(s):  
Zhongliang Deng ◽  
Hanhua Wang ◽  
Xinyu Zheng ◽  
Lu Yin
Keyword(s):  
Selection Method ◽  
Base Station ◽  
Line Of Sight ◽  
Positioning Accuracy ◽  
Channel Condition ◽  
Fifth Generation ◽  
Hybrid Positioning ◽  
Channel Conditions ◽  
Geometric Dilution Of Precision ◽  
Value Changes

The fifth generation (5G) cellular communication system is designed to support Time Difference of Arrival (TDOA), Round-Trip Time (RTT), and Direction of Arrival (DOA) measurements for indoor positioning. To mitigate the positioning error caused by non-line-of-sight (NLOS), existing base station selection methods identify channel conditions and only use line-of-sight (LOS) signals for positioning. However, different selected base station combination would lead to a different geometric dilution of precision (GDOP), base station selection based only on channel condition is not fully applicable for the hybrid positioning. This paper derives the GDOP for the hybrid TDOA, RTT, and DOA positioning, and proposes a GDOP-assisted base station selection method, which is based on both channel conditions and GDOP value changes. The simulation shows that using the proposed base station selection method could lead to higher positioning accuracy than base station selection based only on channel condition. In the simulation, in the side region of the scenario, where the change of selected base station combination causes a notable increment in GDOP value, the positioning accuracy improvement caused by the proposed method is greater than that in the center region.

Study on Design and Experiment of SAW Device Based on MSC

2011 ◽  
Vol 135-136 ◽  
pp. 954-959
Author(s):  
Chang Bao Wen ◽  
Yong Feng Ju ◽  
Li Liu ◽  
Ya Fei Jiang ◽  
Chen Zhao ◽  
...  
Keyword(s):  
Modular Design ◽  
Center Frequency ◽  
Network Analyzer ◽  
Test Results ◽  
Design Environment ◽  
Actual Measurement ◽  
Measurement Results ◽  
Data Output ◽  
Output Module ◽  
Good Agreement

In the design process of surface acoustic wave (SAW) device based on multistrip coupler (MSC), the characteristics of interdigital transducer (IDT) and device can not been directly achieved, and the layout structure of device can not be observed and checked. To solve some problems, the design platform of SAW device based MSC was realized in the Matlab design environment using the modular design. The design platform of SAW device based MSC consists of layout simulation module, characteristics simulation module and data output module. By means of realizing a SAW device based MSC with center frequency at 51.293MHz, the comparison and analysis between the design results and the actual test results are presented. Experiments results confirm that the platform can correctly design the device layout. The device characteristics achieved by the design platform are in good agreement with the actual measurement results by the network analyzer.

Research on the Application of Linearization Pre-Distortion Technique for Memoryless Power Amplifier

2014 ◽  
Vol 687-691 ◽  
pp. 3521-3524
Author(s):  
Su Wang ◽  
Lang Zheng ◽  
Ze Ming Yang ◽  
Cai Zhong
Keyword(s):  
Power Amplifier ◽  
Nonlinear Problems ◽  
Error Vector Magnitude ◽  
Matlab Simulation ◽  
Distortion Model ◽  
Simulation Process ◽  
Input And Output ◽  
Output Amplitude ◽  
Amplifier Linearization ◽  
Vector Magnitude

In order to improve the nonlinear problems of power amplifier, this paper discussed about the nonlinear characteristic of power amplifier without memory and put forward a kind of new pre-distortion model. The MATLAB simulation process was being used to obtain the input and output amplitude curves, and calculated the normalized mean square error NMES and error vector magnitude EVM, the results show that the power amplifier linearization improved after pre-distortion processing.

scholarly journals Comparison of 6 Diode and 6 Transistor Mixers Based on Analysis and Measurement

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
J. Ladvánszky ◽  
K. M. Osbáth
Keyword(s):  
Field Effect Transistors ◽  
Input Power ◽  
Bipolar Transistors ◽  
Large Signal ◽  
Design Environment ◽  
Third Order ◽  
The Third ◽  
Wide Range ◽  
Measurement Results ◽  
Versus Input

Our goal is to overview semiconductor mixers designed for good large signal performance. Twelve different mixers were compared utilizing pn diodes, bipolar transistors, and/or junction field effect transistors. The main aspect of comparison is the third-order intercept point (IP3), and both circuit analysis and measurement results have been considered. IP3 has been analyzed by the program AWR (NI AWR Design Environment) and measured by two-tone test (Keysight Technologies). We provide three ways of improvement of large signal performance: application of a diplexer at the RF port, reduction of DC currents, and exploiting a region of RF input power with infinite IP3. In addition to that, our contributions are several modifications of existing mixers and a new mixer circuit (as illustrated in the figures). It is widely believed that the slope of the third-order intermodulation product versus input power is always greater than that of the first-order product. However, measurement and analysis revealed (as illustrated in the figures) that the two lines may be parallel over a broad range of input power, thus resulting in infinite IP3. Mixer knowledge may be useful for a wide range of readers because almost every radio contains at least one mixer.

scholarly journals A Study on Massive Mimo 5G Challenges

2020 ◽  
Author(s):  
Kanchana Devi A ◽  
Bhuvaneswari B
Keyword(s):  
Network Architecture ◽  
Massive Mimo ◽  
Channel Model ◽  
High Reliability ◽  
High Energy ◽  
Base Station ◽  
High Signal ◽  
Fifth Generation ◽  
5G Network ◽  
Mimo Technology

Massive MIMO is a advance of MIMO technology. M-MIMO use hundreds of Base station (BS) to simultaneously serve multiple users. It combines with millimeter wave (mmWave) to provide huge spectral efficient, high reliability and high energy efficiency. Massive MIMO gives huge antennas, high signal strength, less noise reduction and also using better channel model. This paper discusses the detail description of fifth generation (5G) network architecture and to improve massive MIMO in existing technology.

scholarly journals THE MOBILE SYSTEM REDUCTION FOR THE VIBRATION CONTROL IMPLEMENTATION

2019 ◽  
pp. 16-24
Author(s):  
V. V. Lopatin
Keyword(s):  
Oil And Gas ◽  
Random Noise ◽  
Decisive Role ◽  
Mathematical Methods ◽  
National Importance ◽  
System Reduction ◽  
Input And Output ◽  
Measurement Results ◽  
Almost All ◽  
The Given

Since the mining and oil and gas industries play a decisive role in the Ukrainian economy, the adequacy and proper assessment of the accuracy of the monitoring is of great national importance. A mathematical model for the measurement of MSCs is constructed, which determines the sequence of mathematical operations that must be performed to obtain the quantitative characteristics of the objects of control. If there is a function that is a solution and that describes the object of the MSC, then it is a reduction to the ideal MSC. The solution of the problem of reduction (synthesis) MSC is realized by the choice of design and is provided with such a connection between the signals at its input and output MSC, which leads to the best results. This formulation of the problem of reducing the MSC has several disadvantages. The MSC measurement result is always influenced by a number of minor factors. Their effect leads to the fact that the measured value of a certain value is different from the value predicted by the model of measurement of the ISC on the noise (experiment error), which is random. The noise level of MSCs has a significant effect on the result of mathematical processing, and the less the noise, the better the result of the reduction of MSCs. Previously, the task of instrumentation was to create an MSC that provides the least distortion of the measurement results, while using mathematical methods to reduce instrumentation the task of reducing instrumentation noise is MSC. The given  solution is realized by the choice of design and is provided with such a connection between the input and output signals, which leads to a decrease in the level of random noise MSC. The description of MSC enhancement has the instability of the solution of the equation with respect to the initial data errors, which is a property of almost all integral equations and does not depend on the method of their solution. The proposed mathematical method of reduction of the mobile control system (MSC) as one of the variants of regularization of the incorrectly set problem arose and was further developed under the influence of the ideas of academician AN Tikhonov and Professor Yu.P. Pytiev .  The author suggests taking a different look at the control tasks and the accuracy of assessing the accuracy of MCSs by reducing the level of random noise. The author proposed the implementation of the MCS by choosing a design and providing such a connection between the signal at its input and output, which leads to the best results in solving reduction problems. The author proposed an adaptable model of MCSs using modern ideas and mathematical methods.

scholarly journals High-Order Dual-Port Quasi-Absorptive Microstrip Coupled-Line Bandpass Filters

2020 ◽  
Author(s):  
Xiaohu Wu ◽  
Xiaoguang Liu ◽  
Yingsong Li
Keyword(s):  
Transmission Line ◽  
Detailed Analysis ◽  
Bandpass Filters ◽  
Design Concept ◽  
Coupled Line ◽  
Input And Output ◽  
Quarter Wavelength ◽  
Measurement Results ◽  
In Series ◽  
Simultaneous Input

In this article, we present the first demonstration of distributed and symmetrical all-band quasi-absorptive filters that can be designed to arbitrarily high orders. The proposed quasi-absorptive filter consists of a bandpass section (reflective-type coupled-line filter) and absorptive sections (a matched resistor in series with a shorted quarter-wavelength transmission line). Through a detailed analysis, we show that the absorptive sections not only eliminate out-of-band reflections but also determine the passband bandwidth (BW). As such, the bandpass section mainly determines the out-of-band roll-off and the order of the filter can be arbitrarily increased without affecting the filter BW by cascading more bandpass sections. A set of 2.45-GHz one-, two-, and three-pole quasi-absorptive microstrip bandpass filters are designed and measured. The filters show simultaneous input and output absorption across both the passband and the stopband. Measurement results agree very well with the simulation and validate the proposed design concept.

Optimization in the Simulation Based Design Environment

2001 ◽  
Author(s):  
W. Aldo Kusmik
Keyword(s):  
Product Development ◽  
System Integration ◽  
Product Development Process ◽  
Naval Research ◽  
Design Environment ◽  
Software Environment ◽  
Complex Products ◽  
Office Of Naval Research ◽  
Simulation Based Design ◽  
Simulation Based

Abstract Simulation based design methodologies have the potential to streamline the development and continuous improvement of complex products by addressing three fundamental aspects of team-based product development initiatives: coordination, collaboration, and optimization. On-going research funded by the Office of Naval Research is seeking to augment its baseline simulation based design environment with enhanced system integration, visualization, and optimization capabilities that address these three aspects of the product development process. The inherent strengths of the existing software environment are being leveraged to support the development of these enhanced capabilities including Multi-Disciplinary Optimization methodologies that will enable the rapid convergence on high payoff system alternatives.

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