Path Loss Of Propagation
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Ray Tracing and Applications to an Evaporation Duct Model Based on Data from Oceanographic Buoy Sensors
Abstract The two-dimensional ray tracing method allows an easy and fast modeling of tropospheric propagation in the microwave frequency range. A version of this method that determines ray trajectories, amplitudes and delays of the electromagnetic field, as well as the propagation loss in a two-dimensional inhomogeneous environment will be described. The impl
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2019-03
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2. Propagation Model for Path Loss Through Vegetated Environments at 700 – 800 MHz Band
Abstract In almost all literature about propagation models through vegetated environments, path loss has been proposed based on specimens of temperate clime conditions. In this work, a new propagation model is proposed, based on measurements, carried out on vegetated environments with tropical specimens. These environments are common on suburban and rural ar
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-03
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3. A Hybrid Path Loss Prediction Model based on Artificial Neural Networks using Empirical Models for LTE And LTE-A at 800 MHz and 2600 MHz
Abstract This article presents the analysis of a hybrid, error correction-based, neural network model to predict the path loss for suburban areas at 800 MHz and 2600 MHz, obtained by combining empirical propagation models, ECC-33, Ericsson 9999, Okumura Hata, and 3GPP's TR 36.942, with a feedforward Artificial Neural Network (ANN). The performance of the hyb
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
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4. Heuristics for the optimized deployment of small cells in next-generation networks
Abstract Heterogeneous Networks (HetNets) have been introduced as an alternative means of improving the overall network capacity. However, HetNets increase the complexity and cost of transport due to the large number of smallcells (SCs) that have to be connected, and hence, it is essential to investigate the best way to plan the joint deployment of radio and
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
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5. MÃtodo para avaliaÃÃo de aspectos de camada fÃsica e MAC de redes 802.11. / Method to evaluate physical and MAC layer aspects of 802.11 networks.
The present dissertation proposes a 802.11 network evaluation sequence which can be adopted, independently of the equipment used at the network. The log-distance path loss model is used for the environment characterization (by the model β parameter) where the network is evaluated. The specific objectives of each evaluation stage are presented and contex
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/12/2012
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6. Empirical propagation model to digital TV signals in Curitiba / Modelo de propagaÃÃo empÃrico para sinais de TV digital em Curitiba
The channel modeling is of crucial importance in determining the path loss of RF signals emitted by a transmitter. This work aimed at determining a channel model, by means of the analysis of measurement of the received signals levels from a TV Digital transmitter operating in the UHF range during a survey in the region of Curitiba. From the comparison of som
Publicado em: 2009
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7. Modelo 2,5D de predição de propagação para ambientes interiores utilizando o método do traçado de raios
A 2.5D ray-tracing propagation model is proposed to predict radio loss in indoor environment. Specifically, we opted for the Shooting and Bouncing Rays (SBR) method, together with the Geometrieal Theory of Diffrartion (GTD). Besides the line-of-sight propagation (LOS), we consider that the radio waves may experience reflection, refraction, and diffraction (N
Publicado em: 2005
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8. MEASUREMENT AND ANALYZE OF UWB INDOOR CHANNEL TEMPORAL DISPERSION IN SEVERAL ENVIRONMENT TYPES / MEDIDAS E ANÁLISE DA DISPERSÃO TEMPORAL DO CANAL DE PROPAGAÇÃO UWB INDOOR EM VÁRIOS TIPOS DE AMBIENTES
This work presents an analysis of the ultra wideband (UWB) channel temporal dispersion characteristics evaluated from the frequency sounding technique over a bandwidth of 850MHz at seven different indoor environment. In each environment, the channel temporal dispersions parameters were assessed in terms of mean delay, delay spread and coherence bandwidth. An
Publicado em: 2005
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9. APPLICATION OF COMPUTATIONALLY-INTENSIVE PROPAGATION MODELS TO THE PREDICTION OF PATH LOSSES DUE TO MOUNTAINOUS TERRAIN IN THE VHF FREQUENCY BAND / APLICAÇÃO DE MODELOS COMPUTACIONALMENTE INTENSIVOS NA PREVISÃO DAS PERDAS DE PROPAGAÇÃO DEVIDAS A TERRENOS IRREGULARES NA FAIXA DE VHF
Os efeitos da difração na propagação de ondas de rádio sobre terreno irregular em VHF e outras bandas a ser usado por futuras aplicações da TV digital são normalmente estimados usando um dos muitos modelos clássicos. Nesta dissertação é feita uma comparação dos erros cometidos na previsão do sinal recebido por três modelos de propagação com
Publicado em: 2005
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10. TECHNIQUE OF LAUNCHING OF RAYS IN THREE DIMENSIONS FOR THE PREVISÃO DE COBERTURA IN MICRO-CELULARES ENVIRONMENTS / TÉCNICA DE LANÇAMENTO DE RAIOS EM TRÊS DIMENSÕES PARA A PREVISÃO DE COBERTURA EM AMBIENTES MICRO-CELULARES
O estágio atual das comunicações móveis é caracterizado por um crescimento espetacular da demanda em todos os tipos de ambientes, tanto urbanos densos como suburbanos e rurais . Os planejadores destes sistemas necessitam ferramentas eficientes e economicamente viáveis para a caracterização e projeto deles. O grande objetivo de um bom planejamento é
Publicado em: 2002
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11. Cobertura celular : estatisticas de longo prazo e avaliação de metodos de predição
This work aimed the presentation, analysis and validation of methods for computing path loss of radio signals within the frequency range used by cellular mobile radio systems. The methods herein presented are characterized by taking into account as the main contributor for path loss, the propagation loss due to multiple diffraction as modeled in the work of
Publicado em: 2000