scholarly journals LTE FDD AND SRD EQUIPMENT COMPATIBILITY IN 2500 MHZ BAND / LTE FDD IR SRD ĮRENGINIŲ SUDERINAMUMAS 2500 MHZ RUOŽE

2014 ◽  
Vol 6 (2) ◽  
pp. 206-210
Author(s):  
Evaldas Stankevičius
Keyword(s):  
Frequency Band ◽  
Short Range ◽  
Electromagnetic Compatibility ◽  
Base Stations ◽  
Software Systems ◽  
Frequency Channel ◽  
Channel Distribution ◽  
Mobile Stations ◽  
Communication Devices ◽  
Downlink Channels

This paper examines the LTE mobile communication base stations possible interfering effects on short range communication devices operating in ISM frequency band. LTE network is running in 2500–2690 MHz frequency band, where frequency channel distribution is used. Downlink channels are assigned to base stations and formed in 2620–2680 MHz band, uplink channels are assigned to mobile stations and formed in 2500–2560 MHz band. Short range communication devices operate in 2400–2483.5 MHz frequency range. The main problem of this study – the interference probability and magnitude. Real equipment was simulated using two different modelling software systems for investigation of electromagnetic compatibility: ICS Telecom and Seamcat. The modelling results show that LTE BS have minimum or no impact on operation of short range communication devices in ISM frequency band. Nagrinėjamas LTE mobiliojo ryšio bazinių stočių galimas interferencinis poveikis nedidelio veikimo nuotolio įrenginiams. LTE tinklas veikia 2500–2690 MHz dažnių ruože, naudojamas dažninis kanalų dalijimas. Žemynkrypčiai kanalai, priskiriami bazinėms stotims, formuojami 2620–2680 MHz ruože, aukštynkrypčiai kanalai, priskiriami mobiliosioms stotims, formuojami 2500–2560 MHz ruože. Trumpojo veikimo nuotolio įrenginiai veikia 2400–2483,5 MHz dažnių ruože. Pagrindinė šio tyrimo problema – galima interferencija ir jos mastas. Realus įrenginių veikimas modeliuojamas dviejomis skirtingomis programomis, kurios skirtos elektromagnetiniam suderinamumui tirti: ICS Telecom ir Seamcat.

EMC PROVISION PROBLEMS OF RAILWAY LTE-1800 COMMUNICATION NETWORKS FOR THE NONSTANDARDIZED FREQUENCY BAN

2020 ◽  
Author(s):  
С.В. ТЕРЕНТЬЕВ ◽  
М.А. ШЕЛКОВНИКОВ ◽  
В.О. ТИХВИНСКИЙ ◽  
Е.Е. ДЕВЯТКИН
Keyword(s):  
Communication Networks ◽  
Frequency Band ◽  
Electromagnetic Compatibility ◽  
Band 3 ◽  
Access Networks ◽  
Base Stations ◽  
Radio Access Networks ◽  
Mobile Operator ◽  
Radio Access ◽  
The Subject

Предметом статьи является исследование электромагнитной совместимости (ЭМС) базовых станций LTE нестандартизованного частотного диапазона 1785-1805 МГц с временным дуплексом (TDD) для технологической связи на железныхдорогах и базовых станций LTE-1800 с частотным дуплексом (FDD) операторов мобильной связи частотного диапазона Band 3. Актуальность исследований обусловлена будущим внедрением технологической сети LTE-1800 TDD для организации беспроводной связи на железных дорогах и разработкой условий ЭМС с существующими сетями радиодоступа E-UTRAN FDD операторов мобильной связи, работающих в примыкающих частотных диапазонах 1710-1785 и 1805-1880 МГц. The subject of this article is a study of electromagnetic compatibility (EMC) conditions of LTE-1800 TDD base stations for railways technological communications in the non-standardized frequency band 1785-1805 MHz and LTE-1800 FDD base stations of traditional mobile operator networks of the Band 3 frequency band. The relevance of the research is due to the future deployment of technological railway LTE-1800 TDD communication networks and the development of EMC conditions with the existing E-UTRAN FDD radio access networks of mobile operators operating in the adjacent frequency ranges 1710-1785 MHz and 1805-1880 MHz.

scholarly journals Electromagnetic Compatibility Studies: LTE BS vs. Aeronautical Radionavigation Services in 694-790 MHz Frequency Band

2014 ◽  
Vol 6 (1) ◽  
pp. 38-44 ◽  
Author(s):  
Evaldas Stankevičius ◽  
Šarūnas Oberauskas
Keyword(s):  
Monte Carlo ◽  
Frequency Band ◽  
Electromagnetic Compatibility ◽  
Software Tool ◽  
Statistical Simulation ◽  
Mobile Services ◽  
Separation Distance ◽  
Base Stations ◽  
Simulation Monte Carlo ◽  
Two Phases

Abstract This paper presents the sharing analysis of the 694–790 MHz frequency band for Mobile services IMT and Aeronautical radio-navigation services (ARNS) using SEAMCAT (established by CEPT) software based on the statistical simulation (Monte-Carlo) method. In 2012 the World Radiocommunication Conference (WRC-12) decided to allocate the 694–790 MHz frequency band (the so-called 700 MHz band) to mobile services IMT (excluding aeronautical mobile) after WRC-15 conference. But this agreement raises electromagnetic compatibility problems, which should be solved until WRC-15 [1]. This study was carried out in two phases: first applying theoretical analysis, then statistical Monte-Carlo simulations with SEAMCAT software tool in order to verify results obtained in theoretical approach. Analytical calculations shows that the required protection distances between ARNS stations and the MS base stations are 132 km. The obtained results from SEAMCAT simulations indicate that separation distance should be above 100 km. These results illustrate that the systems are not electromagnetically compatible. The possible mitigation technic could be antenna pattern correction.

scholarly journals Trajectories and Resource Management of Flying Base Stations for C-V2X

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 811 ◽  
Author(s):  
Silvia Mignardi ◽  
Chiara Buratti ◽  
Alessandro Bazzi ◽  
Roberto Verdone
Keyword(s):  
Cellular Network ◽  
Short Range ◽  
Base Stations ◽  
Trajectory Design ◽  
Radio Resource ◽  
Traffic Distribution ◽  
Communication Devices ◽  
Sensing Application ◽  
Application Requirements ◽  
Mobile Base

In a vehicular scenario where the penetration of cars equipped with wireless communication devices is far from 100% and application requirements tend to be challenging for a cellular network not specifically planned for it, the use of unmanned aerial vehicles (UAVs), carrying mobile base stations, becomes an interesting option. In this article, we consider a cellular-vehicle-to-anything (C-V2X) application and we propose the integration of an aerial and a terrestrial component of the network, to fill the potential unavailability of short-range connections among vehicles and address unpredictable traffic distribution in space and time. In particular, we envision a UAV with C-V2X equipment providing service for the extended sensing application, and we propose a UAV trajectory design accounting for the radio resource (RR) assignment. The system is tested considering a realistic scenario by varying the RRs availability and the number of active vehicles. Simulations show the results in terms of gain in throughput and percentage of served users, with respect to the case in which the UAV is not present.

scholarly journals Utilizing Context in Location-Aware Short-Range Wireless Communication

2010 ◽  
Vol 2010 ◽  
pp. 1-12 ◽  
Author(s):  
Vesa A. Korhonen ◽  
Ritva Pyykkönen
Keyword(s):  
Wireless Communication ◽  
Information Search ◽  
Short Range ◽  
Human Interaction ◽  
Preliminary Design ◽  
Data Filtering ◽  
Web Based ◽  
Communication Devices ◽  
Search Tool ◽  
Additional Value

We discuss how a short-range wireless communication service implemented for modern mobile communication devices can provide additional value for both the consumer and the service/product provider. When used as an information search tool, such systems allow services and products being promoted at the location they are available. For the customer, it may provide a “digitally augmented vision”, an enhanced view to the current environment. With data filtering and search rules, this may provide a self-manageable context, where the user's own personal environment and preferences to the features available in the current surroundings cooperate with a direct connection to the web-based social media. A preliminary design for such service is provided. The conclusion is that the method can generate additional revenue to the company and please the customers' buying process. In addition to the marketing, the principles described here are also applicable to other forms of human interaction.

scholarly journals Optimizing a Secure Two-Way Network with Non-Linear SWIPT, Channel Uncertainty, and a Hidden Eavesdropper

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1222
Author(s):  
Pham Viet Tuan ◽  
Pham Ngoc Son ◽  
Tran Trung Duy ◽  
Sang Quang Nguyen ◽  
Van Quang Binh Ngo ◽  
...  
Keyword(s):  
Base Stations ◽  
Artificial Noise ◽  
Power Splitting ◽  
Transmission Power ◽  
Channel State ◽  
Downlink Beamforming ◽  
Non Linear ◽  
Channel Information ◽  
Downlink Channels

In this paper, the optimization of downlink beamforming vectors, uplink transmission power, and power-splitting factors is investigated for a secure two-way SWIPT network in the presence of a hidden eavesdropper and non-linear energy harvesting circuits over both perfect and imperfect channels. The eavesdropper is inactive, so its channel information is not available at the base stations (BSs). The purpose of artificial noise is to create downlink interference with the hidden eavesdropper as much as possible, while satisfying the quality of service for two-way communications. For perfect downlink channels, the semidefinite relaxation (SDR) technique is exploited, and the optimal matrices are proven to satisfy rank-1 conditions, thus providing the optimal beamforming vectors. For imperfect downlink channel state information, we propose an iterative algorithm with a penalty function to obtain the approximate rank-1 matrices. On uplink, we attain the optimal transmission power for users receiving maximum ratio transmission beamforming at the BSs. Eventually, the numerical experiments show the superiority of the proposed scheme, compared to a conventional scheme, in terms of signal-to-interference-plus-noise ratio at the eavesdropper.

An Adaptive Trustworthiness Modelling Approach for Ubiquitous Software Systems

2014 ◽  
Vol 8 (4) ◽  
pp. 44-61 ◽  
Author(s):  
Amr Ali-Eldin ◽  
Jan Van Den Berg ◽  
Semir Daskapan
Keyword(s):  
Information Disclosure ◽  
Short Range ◽  
Software Systems ◽  
Wireless Devices ◽  
Privacy And Security ◽  
Proposed Model ◽  
Disclosure Decisions ◽  
Processing Resources ◽  
Trust Models ◽  
Modelling Approach

With the growing interest in ubiquitous applications, attention should be given to privacy and trust issues. Since these environments are quite dynamic, and interactive where devices possess low computing resources, new trust models are required that suit this environment and help overcome its limitations. In this paper, the authors explore the possibility to settle trust in an adaptive way prior to any information disclosure to enable adaptive privacy and security. The proposed model is simulated in a commercial cluster scenario where users can clear all their payments with their short-range ubiquitous devices. In this domain, the authors assume that the user has to rely on what they call payment disclosure service (PDS) to control his or her disclosure decisions. The proposed model respects the limitations of wireless devices such as limited connectivity and processing resources, while enabling autonomous and secure operations.

scholarly journals Fast Frequency Sweep Technique Based on Segmentation for the Acceleration of the Electromagnetic Analysis of Microwave Devices

2019 ◽  
Vol 9 (6) ◽  
pp. 1118
Author(s):  
Juan Martinez ◽  
Angel Belenguer ◽  
Héctor Esteban
Keyword(s):  
Frequency Band ◽  
Rectangular Waveguide ◽  
Building Blocks ◽  
Frequency Sweep ◽  
Discrete Frequency ◽  
Natural Cubic Splines ◽  
Communication Devices ◽  
Waveguide Filter ◽  
Electromagnetic Solver

The characterization of communication devices in a certain frequency band can be accelerated if a fast frequency sweep technique is used instead of a discrete frequency sweep. Existing fast frequency sweep techniques are either complex or specific for a certain electromagnetic solver. In this work, a new fast frequency sweep method is proposed that consists in segmenting the device under analysis into simple building blocks. Each building block is characterized with a generalized (multimode) circuital matrix whose elements present a simple and flat frequency response that is interpolated using natural cubic splines with very few points. In this way, the response of each block along the whole frequency band is obtained efficiently and accurately with as many frequency points as desired. Then, the circuital matrices of all the blocks are cascaded and the circuital matrix of the whole device in obtained. The new fast frequency sweep was successfully applied to the analysis of different types of devices (all metallic rectangular waveguide filter, dielectric loaded rectangular waveguide filter, and substrate integrated waveguide filter). The computational times were reduced to 15% or 19%, depending on the device, when compared with a discrete frequency sweep using the same electromagnetic solver.

scholarly journals Effects of emission from different UWB short-range communication devices

2011 ◽  
Author(s):  
F. Arvin ◽  
H. A. Majid ◽  
S. J. Hashim ◽  
R. S. A. R. Abdullah ◽  
A. M. Ali ◽  
...  
Keyword(s):  
Short Range ◽  
Communication Devices
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