Abstract
Advanced metering infrastructure (AMI) is an important application of smart grid communication technology used for the remote monitoring and control of smart meters. Broadband powerline communication (BB-PLC) systems could perhaps be used for AMI; however, impulsive noise (IN) greatly degrades performance. In addition to the fast Fourier transform (FFT)-based orthogonal frequency-division multiplexing (OFDM), IEEE 1901 specifications have defined the other physical layer called wavelet-based OFDM. Even though many existing studies have reported the IN mitigation algorithms for the FFT-based OFDM system, these approaches may not directly apply to the wavelet-OFDM-based PLC systems. In this paper, we propose a robust receiver for PLC systems based on wavelet-OFDM. The proposed receiver comprises a pre-IN mitigation block, an adaptive inverse discrete wavelet transform, and an iterative IN reconstruction block. The iterative cancellation of strong IN samples leads to a gradual improvement in the quality of the received signal. Instead of using the frequency domain approach, we reduce the inter-dependency of the channel estimation and per-subchannel equalization by using the time domain signal processing. Besides, we apply variable step-size adaptive algorithms to reduce the impact of IN during the training processes for the channel estimator and per-subchannel equalizer. In accordance with IEEE 1901 specifications, we built a simulation environment to evaluate the effectiveness of the proposed method. Simulation results demonstrated that conventional blanking devices fall short in terms of IN mitigation, and that the proposed scheme is able to achieve performance values approaching those obtained in cases without IN.
Highlights
With an advanced metering infrastructure (AMI), researchers have shown that broadband powerline communication (BB-PLC) systems are applicable to backhaul communication [1] and service quality estimation [2]
We evaluated the performance of the proposed impulsive noise (IN) mitigation algorithm by establishing transmitters for use in a wavelet-orthogonal frequency-division multiplexing (OFDM) PLC system in accordance with IEEE 1901 specifications [11]
This paper proposes an enabling technology for BB-PLC-based AMI
Summary
With an advanced metering infrastructure (AMI), researchers have shown that broadband powerline communication (BB-PLC) systems are applicable to backhaul communication [1] and service quality estimation [2]. Many IN mitigation schemes have been proposed for FFT-OFDM-based PLC systems. PLC systems was proposed in Reference [22], which simultaneously considered the channel estimation, channel equalization, and IN mitigation issues in the frequency domain. In Reference [23], the authors used a linear precoder at the transmitter and applied overlapped frequency-domain equalizers to mitigate IN for wavelet-OFDM-based PLC systems. We proposed an adaptive analysis filter bank, comprised of the DWT block and adaptive per-subchannel equalizers, such that the channel is equalized in the time domain for each subchannel In this way, no additional FFT operation is required to perform equalization in the frequency domain. Note that a wavelet-based OFDM system does not implement guard interval and causes performance degradation in the multipath PLC channels.
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