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Title: Estudo de transmissão de dados em faixa larga sobre redes de energia elétrica
Other Titles: Data transmission over power lines
Keywords: broadband over power line;  BPL;  OFDM;  ruído impulsivo;  broadband over power line;  BPL;  OFDM;  impulsive noise
Issue Date: 17-Dec-2010
Abstract: Nowadays, the use of power lines has been extensively studied as a medium for transmitting high data rates to deliver broadband services. This new communication system is known as BPL (Broadband over Power Line) in the USA and Brazil and PLC (Power Line Communications) in Europe. Under the economical point of view, the advantage of BPL is associated to the penetration of power line networks everywhere, increasing the capillarity of the conventional telecommunication systems. Consequently, the cost for making accessible Internet and other services to the great public is significantly lower. However, there are important technical problems for communications over power lines, such as signal attenuation, multipath propagation and noise. Based on the characteristics of the BPL channel, this dissertation deals with the analysis these problems, emphasizing particularly the effects of selective fading and impulsive noise. In this study, the existing regulation of the Brazilian agencies ANEEL and ANATEL was taken into account. The technique OFDM (Orthogonal Frequency Division Multiplex) was used to combat the selective fading. QPSK, 8PSK and 16QAM modulations were employed in the simulations of the BPL channel considering the additive white Gaussian noise (AWGN) alone and together with the impulsive noise. In both cases the best performance were achieved with 16QAM. However, when the impulse noise was introduced, the need for correcting codes was observed to maintain the bit error rate below 10-3 without an excessive increase of the signal-to-noise ratio.
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