1,721,010 research outputs found
Adaptive hybrid circuit for enhanced echo cancellation in full duplex PLC
No full textIn-band full duplex power line communications (IBFD-PLC) is an attractive technology that can not only boost the communication throughput, but also help solving networking and security related issues. This paper is focused on the architectural design of IBFD-PLC modems and proposes the adoption of an adaptive analog hybrid to complement the existing technical solutions. Technical details on how to implement such hybrid are presented and its performance in terms of self-interference suppression is assessed. The results show that the proposed hybrid allows to reduce the amount of self-interference around 10 dB more than the solution already presented in the literature
Smart Grid Monitoring Using Power Line Modems: Effect of Anomalies on Signal Propagation
No full textAnalysis of High-Frequency Impedance Measurement Techniques for Power Line Network Sensing
No full textPower line network topology identification using admittance measurements and total least squares estimation
No full textIn this paper, we consider the identification of a smart grid network topology by means of admittance measurements performed at the network nodes. We show how the application of the transmission line theory allows the identification of the node-to-node connections. Thereby, a topology identification algorithm is presented. The identification error due to the network noise is reduced by performing repeated measurements, either at different time instants or over a set of frequencies, at each network node. The information is then fused by means of the total least square regression technique, which is also compared to a simpler estimator. A thorough analysis of the results is then presented, which shows good reliability of the proposed algorithm
Power line fault detection and localization using high frequency impedance measurement
No full textThe reliability and quality of electrical power networks are affected by the occurrence of electrical faults. In this paper, we propose a novel method to identify the occurrence of faults in distribution networks, based on impedance measurements performed at the central distribution office. The measurements can be performed using PLC modems that belong to the energy metering infrastructure. The fault is detected by means of continuous impedance monitoring and afterwards its distance from the central office is estimated using the same measurement traces, without requiring additional information. Different type of faults are tested, and the effect of the measurement bandwidth and the electrical noise on the measurement is also assessed
Full duplex power line communication modems for network sensing
No full textPower distribution networks have peculiar characteristics that make sensing and control challenging. The topo-logical structure is complex and often variable; different type of faults are common and often cause undetectable damage to the network; the power cables of aerial and especially those of buried lines are subject to aging that eventually causes degradation in power and signal distribution. In this paper, we show different techniques to monitor all these characteristics by leveraging the recently investigated in-band full duplex power line technology. As an explanatory example, we show simulation results about monitoring of the cable aging phenomenon. We also present a technique that can be used to precisely localize the detected faults or cable imperfections
Secure phy layer key generation in the asymmetric power line communication channel
No full textLeakage of information in power line communication (PLC) networks is a threat to privacy and security. A way to enhance security is to encode the transmitted information with the use of a secret key. If the communication channel exhibits common characteristics at both ends and these are unknown to a potential eavesdropper, then it is possible to locally generate a common secret key at the two communication ends without the need for sharing it through the broadcast channel. This is known as physical layer key generation. To this aim, known techniques have been developed exploiting the transfer function of symmetric channels. However, the PLC channel is in general not symmetric, but just reciprocal. Therefore, in this paper, we first analyze the characteristics of the channel to verify whether physical layer key generation can be implemented. Then, we propose two novel methods that exploit the reciprocity of the PLC channel to generate common information by the two intended users. This information is processed through different quantization techniques to generate secret keys locally. To assess the security of the generated keys, we analyze the spatial correlation of PLC channels. This allows verifying whether the eavesdropper’s channels are weakly correlated with the intended users’ channel. Consequently, it is found that the information leaked to a possible eavesdropper has very low correlation to the locally generated key. The analysis and proposed methods are validated on a measurement dataset
Smart Grid Monitoring Using Power Line Modems: Anomaly Detection and Localization
No full textThe main subject of this paper is the sensing of network anomalies that span from harmless impedance changes at some network termination to more or less pronounced electrical faults, considering also cable degradation over time. In this paper, we present how to harvest information about such anomalies in distribution grids using high frequency signals spanning from few kHz to several MHz. Given the wide bandwidth considered, we rely on power line modems as network sensors. We first discuss the front-end architectures needed to perform the measurement and then introduce two algorithms to detect, classify, and locate the different kinds of network anomalies listed above. Simulation results are finally presented. They validate the concept of sensing in smart grids using power line modems and show the efficiency of the proposed algorithms
In Band Full Duplex PLC: The role of the hybrid coupler
No full textIn Band Full Duplexing (IBFD) has recently become attractive for power line communications (PLC). In this paper we analyze the role of the first stage of a PLC-IBFD modem: The hybrid coupler. An analytical analysis of its influence on the signal transfer function is performed and some simulations using a measurement database are also included. Possible hardware implementation of a PLC hybrid coupler are finally discussed
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