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In this paper, a sub-optimal log probability ratio is proposed as soft decision information for the Viterbi decoding in OFDM based PLC system with differentially modulated QPSK, which requires average noise power on each subcarrier. A simple method to determine average noise power is described. Potential narrow band interferer, which may negatively affect the quality of the soft decision information,...
In this paper, an optimized time-frequency interleaving scheme is proposed to combat against the narrowband interference (NBI) and time-domain impulsive noise (TIN) for orthogonal frequency division multiplexing (OFDM) systems in power line communications (PLC). To improve both the anti-NBI and anti-TIN performance, we propose two criteria based on which the optimized interleaving scheme is designed:...
The paper deals with narrow band power line channel for low voltage access network in China. Major channel characteristics such as access impedances, interferences, and attenuations for frequency between 30–500 kHz are evaluated based on measurements results in a typical urban underground network. Coupling mode has a significant impact on the performance of narrow band power line communication. Comparison...
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