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Sistema de Comunicação PLC: uma análise de capacidade
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Esta dissertação foi desenvolvida para se estudar o comportamento de redes PLC (Power Line
Communication), no que respeita à capacidade do canal em diferentes contextos de utilização.
Para isso, estudou-se como funciona a comunicação PLC, qual a sua utilização atual, que tipo
de aplicações é que foram desenvolvidas de modo a utilizar este tipo de tecnologia, quais as
normas existentes, e os constrangimentos que a sua utilização pode apresentar.
Após esta pesquisa sobre comunicação em linhas de potência, decidiu-se utilizar um modelo de
canal PLC já desenvolvido, de modo a avaliar qual a relação entre os valores de débito binário
obtido e a distância entre os módulos emissor e recetor. Após avaliação de diversos modelos
que utilizam diferentes tipos de abordagem, foi decidido utilizar um modelo baseado e aferido
com recursos a medições efetuadas em ambiente real, permitindo obter resultados relativamente
realistas e ser modificado de modo a ser executado com diferentes condições.
Este modelo foi desenvolvido em torno das normas 47 FCC parte 15 e CISPR 22, e baseia-se
num canal composto por dois modems PLC ligados em duas tomadas elétricas que comunicam
entre si.
Por forma a permitir obter os resultados pretendidos, o modelo existente foi modificado de modo
a permitir executar múltiplas simulações com base numa configuração inicial de parâmetros de
simulação.
Com as simulações efetuadas foi possível obter diferentes resultados quer numéricos, quer
gráficos, que permitiram avaliar o desempenho deste tipo de sistema.
Verificou-se que nos três cenários de aplicação analisados: curta, média e longa distância entre
os dois modems, os valores mais elevados de débito binário são obtidos no cenário de menor
distância, e os valores mais baixos no cenário de longa distância entre modems. Em termos
gerais para uma distância de 10 m entre modems o valor de débito binário obtido é da ordem
dos 210 Mbps. Para distâncias da ordem dos 40 m o valor obtido é de 6 Mbps.
Com base nos resultados das simulações efetuadas nesta dissertação é proposto um modelo
analítico do canal PLC.
This dissertation was developed in order to study the behaviour of PLC (Power Line Communication) networks, in terms of channel capacity in different contexts. To do so, PLC communication works were studied, namely, what are its current use, what type of applications were designed to use this type of technology, what are the existing standards, and the restrictions that its use may present. After this research on power line communications, it was decided to use an already developed PLC channel model to study the relation between the achievable datarate and the distance between the transmitter and the receiver. After the evaluation of several models, based on different types of approaches, it was decided to use a model, assessed with measurements in real environments, allowing to obtain realistic results and being modified in order to be configured with different simulation parameters. This model was developed based on 47 FCC part 15 and CISPR 22 standards and is based on a channel composed of two PLC modems connected to two electrical outlets. From the performed simulations it was possible to obtain different numerical and graphical results allowing two evaluate the performance of such kind of system. It was found that in the three application scenarios being studied: short, medium and long distance between the two modems, the highest values of bitrate are obtained in the scenario of shortest distance, and the worst values in the scenario of long distance between modems. Globally, for distances up to 10 m between the modems the obtained datarate is of the order of 210 Mbps. For a distance of 40 m the obtained value is 6 Mbps. From the simulation results an analytical model of the PLC channel is proposed.
This dissertation was developed in order to study the behaviour of PLC (Power Line Communication) networks, in terms of channel capacity in different contexts. To do so, PLC communication works were studied, namely, what are its current use, what type of applications were designed to use this type of technology, what are the existing standards, and the restrictions that its use may present. After this research on power line communications, it was decided to use an already developed PLC channel model to study the relation between the achievable datarate and the distance between the transmitter and the receiver. After the evaluation of several models, based on different types of approaches, it was decided to use a model, assessed with measurements in real environments, allowing to obtain realistic results and being modified in order to be configured with different simulation parameters. This model was developed based on 47 FCC part 15 and CISPR 22 standards and is based on a channel composed of two PLC modems connected to two electrical outlets. From the performed simulations it was possible to obtain different numerical and graphical results allowing two evaluate the performance of such kind of system. It was found that in the three application scenarios being studied: short, medium and long distance between the two modems, the highest values of bitrate are obtained in the scenario of shortest distance, and the worst values in the scenario of long distance between modems. Globally, for distances up to 10 m between the modems the obtained datarate is of the order of 210 Mbps. For a distance of 40 m the obtained value is 6 Mbps. From the simulation results an analytical model of the PLC channel is proposed.
Descrição
Palavras-chave
Telecomunicações Linhas de Potência Power Line Communication Débito Binário Telecommunications Powerline Power Line Communication Datarate