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Impulse noise (IN) is one of the major impairments for data transmission over power lines. For power line communications (PLC) systems with bandwidths in the high kHz to MHz range, IN occurs in bursts. As long as those bursts are sufficiently short compared to a signal-processing (e.g. coding) frame, there is hope to successfully mitigate IN. In this paper, we introduce a new IN mitigation technique...
We compare the performance of different powerline communication (PLC) systems under various realistic noise conditions, namely white noise, periodic impulsive noise in the time-domain, and narrowband co-channel interference. We base the study on narrowband (<; 500 kHz) PLC based on OFDM in general, with specific focus on two prominent PLC industrial specifications for e-metering applications: PRIME...
Noise in the power line channel can not be described by additive white Gaussian noise (AWGN). This channel suffers from impulsive noise and other narrow-band interferences. Impulsive noise, in particular, can degrade the performance of OFDM-based power line communication (PLC) systems significantly. Therefore, channel coding is important to combat the impairments in this hostile medium. Interleaving...
In this paper, we implement Bose-Chaudhuri-Hocquenghen (BCH) coding to study the performance of Power Line Channel (PLC) impaired by impulsive noise and AWGN. Quadrature amplitude modulation (QAM) is employed and orthogonal frequency division multiplexing (OFDM) is used as a transmission scheme. Block truncation coding (BTC) is used for the compression of the image. A comparison is made between uncoded...
Narrowband communications over power lines has been in use for automatic meter reading (AMR) of electric, gas, and water meters. The major hurdle in the widespread use of this medium is the time varying nature of the channel and impairments such as the presence of colored background noise and large impulse noises in time and frequency domains. In this paper, we model the extremely noisy channel environment...
In this paper we investigate the performance of array codes and in particular generalised array codes (GAC) and row and column array codes (RAC) as coding schemes in the power line communications (PLC) environment. We apply different code rates and modulation techniques and we examine how these codes perform in the hostile channel of power lines in terms of BER (bit error rate) versus Eb / N0 (signal...
OFDM is the digital modulation scheme that multiplexes multiple orthogonal sub-carriers that are digitally modulated. One of the schemes that improve the performance of OFDM transmission is the sub-carrier adaptive modulation scheme. In order to perform sub-carrier adaptive modulation, it is necessary to transmit the allocation information of modulation schemes for each sub-carrier and this degrades...
In OFDM transmission, it is possible to adoptively control transmission scheme of each sub-carrier according to the transmission channel because each sub-carrier in OFDM is orthogonally arranged in frequency domain. Although this sub-carrier independent adaptive modulation scheme is very efficient, it is necessary to transmit allocation information of modulation scheme, coding scheme and so on. In...
This paper proposes an improved decoding technique to remove impulsive noise effects on broadband powerline communication systems. Presented contribution deals with Home Plug 1.0 OFDM-based PLC scheme in presence of impulsive noise modeled by a stochastic distribution approximation. In order to improve receiver BER regarding impulsive noise effect and to reduce the complexity processing, a decoding...
In this paper we study how power line communications are affected by different coding techniques. We investigate the case of LDPC coding scheme and its application to the PLC channel. The modulation method applied is BPSK while the transmission technique used is OFDM. We study regular LDPC codes, which is the worst case scenario concerning the performance of LDPC codes. The OFDM symbol size is initially...
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