Impact of Effective Antenna Pattern on Radio Frequency Exposure Evaluation for 5G Base Station with Directional Antennas

2020 ◽  
Author(s):  
Kamil Bechta ◽  
Christophe Grangeat ◽  
Jinfeng Du
Keyword(s):  
Radio Frequency ◽  
Directional Antennas ◽  
Base Station ◽  
Antenna Pattern ◽  
Exposure Evaluation

Effects of directional antennas at the base station on the Doppler spectrum

1997 ◽  
Vol 1 (2) ◽  
pp. 40-42 ◽  
Author(s):  
P. Petrus ◽  
J.H. Reed ◽  
T.S. Rappaport
Keyword(s):  
Directional Antennas ◽  
Base Station ◽  
Doppler Spectrum

scholarly journals Improved Algorithms for Data-Gathering Time in Sensor Networks II: Ring, Tree, and Grid Topologies

2009 ◽  
Vol 5 (5) ◽  
pp. 463-479 ◽  
Author(s):  
Yoram Revah ◽  
Michael Segal
Keyword(s):  
Data Gathering ◽  
Directional Antennas ◽  
Base Station ◽  
Sensor Nodes ◽  
Delivery Time ◽  
Packet Delivery ◽  
Central Node ◽  
Hazard Detection ◽  
Wide Range ◽  
Efficient Data

We address the problem of gathering information in sensor webs consisting of sensors nodes, wherein a round of communication sensor nodes have messages to be sent to a distant central node (called the base station) over the shortest path. There is a wide range of data gathering applications like target and hazard detection, environmental monitoring, battlefield surveillance, etc. Consequently, efficient data collection solutions are needed to improve the performance of the network. In this article, we take into account the fact that interference can occur at the reception of a message at the receiver sensor. In order to save redundant retransmissions and energy, we assume a known distribution of sources (each node wants to transmit at most one packet) and one common destination. We provide a number of scheduling algorithms jointly minimizing both the completion time and the average packet delivery time. We define our network model using directional antennas and consider Ring, Tree, and Grid Network (and its generality) topologies. All our algorithms run in low-polynomial time.

scholarly journals Exposure Perception as a Key Indicator of Risk Perception and Acceptance of Sources of Radio Frequency Electromagnetic Fields

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Frederik Freudenstein ◽  
Peter M. Wiedemann ◽  
Tim W. C. Brown
Keyword(s):  
Risk Perception ◽  
Radio Frequency ◽  
Linear Regression Analysis ◽  
Base Station ◽  
Base Stations ◽  
Main Determinant ◽  
Main Research ◽  
Online Study ◽  
Exposure Reduction ◽  
Key Indicator

The presented survey was conducted in six European countries as an online study. A total of 2454 subjects participated. Two main research questions were investigated: firstly, how does the cognitive, moral, and affective framing of radio frequency electromagnetic field (RF EMF) exposure perception influence RF EMF risk perception? Secondly, can the deployment of mobile phone base stations have greater acceptance with RF EMF exposure reduction? The findings with respect to the first question clearly indicated that the cognitive framed exposure perception is the main determinant of RF EMF risk perception. The concomitant sensitivity to exposure strength offers an opportunity to improve the acceptance of base stations by exposure reduction. A linear regression analysis supported this assumption: in a fictional test situation, exposure reduction improved the acceptance of base stations, operationalized as the requested distance of the base station from one’s own home. Furthermore, subjects with high RF EMF risk perception were most sensitive to exposure reduction. On average, a 70% exposure reduction reduced the requested distance from about 2000 meters to 1000 meters. The consequences for risk communication are discussed.

scholarly journals Enhanced Transmit-Antenna Selection Schemes for Multiuser Massive MIMO Systems

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Byung-Jin Lee ◽  
Sang-Lim Ju ◽  
Nam-il Kim ◽  
Kyung-Seok Kim
Keyword(s):  
Computational Complexity ◽  
Radio Frequency ◽  
Spectral Efficiency ◽  
Massive Mimo ◽  
Mimo Systems ◽  
Antenna Selection ◽  
Base Station ◽  
Base Stations ◽  
Transmit Antenna Selection ◽  
Selection Scheme

Massive multiple-input multiple-output (MIMO) systems are a core technology designed to achieve the performance objectives defined for 5G wireless communications. They achieve high spectral efficiency, reliability, and diversity gain. However, the many radio frequency chains required in base stations equipped with a high number of transmit antennas imply high hardware costs and computational complexity. Therefore, in this paper, we investigate the use of a transmit-antenna selection scheme, with which the number of required radio frequency chains in the base station can be reduced. This paper proposes two efficient transmit-antenna selection (TAS) schemes designed to consider a trade-off between performance and computational complexity in massive MIMO systems. The spectral efficiency and computational complexity of the proposed schemes are analyzed and compared with existing TAS schemes, showing that the proposed algorithms increase the TAS performance and can be used in practical systems. Additionally, the obtained results enable a better understanding of how TAS affects massive MIMO systems.

Design of Radio Frequency Link in Automatic Test System for Multimode Mobile Communication Base Station

2015 ◽  
Vol 25 (14) ◽  
pp. 1540032
Author(s):  
Weipeng Zhang
Keyword(s):  
Radio Frequency ◽  
Mobile Communication ◽  
Test System ◽  
Base Station ◽  
Base Stations ◽  
Automatic Test ◽  
Automatic Test System ◽  
Link Functions ◽  
Noise Filter ◽  
General Module

A modularized design for the radio frequency (RF) link in automatic test system of multimode mobile communication base station is presented, considering also the characteristics of wireless communication indices and composition of signals of base stations. The test link is divided into general module, time division duplex (TDD) module, module of spurious noise filter, module of downlink intermodulation, module of uplink intermodulation and uplink block module. The composition of modules and link functions are defined, and the interfaces of the general module and the module of spurious noise filter are described. Finally, the estimated gain budget of the test link is presented. It is verified by experiments that the system is reliable and the test efficiency is improved.

scholarly journals Экспериментальная модель многолучевого устройства для наблюдения в радиосвете

2021 ◽  
Vol 47 (12) ◽  
pp. 38
Author(s):  
А.С. Дмитриев ◽  
М.М. Петросян ◽  
А.И. Рыжов
Keyword(s):  
Radio Frequency ◽  
Directional Antennas ◽  
Experimental Device ◽  
Primary Processing

The possibility of creation of biological eye analogue working in radio-frequency is considered in order to observe the environment using artificial radiolight. In accordance with its biological prototype, this analogue consists of system of sensitive elements (retina), lens-like focusing element and the set of directional antennas that are used for primary processing of received noise-like ultrawideband radiation. The experimental device of this type is proposed and its performance is demonstrated.

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