PLC Receiver Filtering for Multi-Band Interference Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electric meters designed to communicate via power-line communication (PLC) face challenges in receiving PLC signals effectively when multiple frequency bands, such as CENELEC A and FCC bands, share the same power grid, leading to disrupted signal quality due to interference from other frequency bands.
Innovation Solution
A device with a filtering stage and processing circuit that dynamically configures itself to optimize the receipt of PLC signals by analyzing the preamble of each frame, allowing it to distinguish between different frequency bands and adapt the filtering mode to minimize interference, ensuring excellent signal-to-noise ratio for both CENELEC A and FCC signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the filtering stage passes both first PLC signals (CENELEC A band) and second PLC signals (FCC band) simultaneously in default mode, then the device can receive signals from multiple frequency bands, but the receiving quality of first PLC signals deteriorates due to interference from second PLC signals
Solution Approach 1:
The filtering stage is configured to dynamically switch between different filtering modes based on the detected PLC signal frequency band. The processing circuit analyzes the preamble of received frames to identify whether first PLC signals (CENELEC A band) or second PLC signals (FCC band) are present, and accordingly configures the filtering stage in first selection mode or second selection mode. This dynamic adaptation resolves the contradiction by allowing the system to maintain high receiving quality for the active frequency band while preserving the ability to communicate across multiple bands.
Solution Approach 2:
The filtering stage applies different filtering characteristics tailored to each frequency band. In first selection mode, the filter is optimized for CENELEC A band signals, while in second selection mode, it is optimized for FCC band signals. This localized optimization of filtering properties for each specific frequency band ensures high receiving quality without interference from other bands, while the system as a whole maintains versatility across multiple bands.
2Reliability
If the filtering stage is configured in first selection mode to stop second PLC signals and pass only first PLC signals, then the receiving quality of first PLC signals is optimized, but the device cannot receive second PLC signals simultaneously
Solution Approach 1:
The processing circuit periodically analyzes the preamble of received PLC signal frames to determine which frequency band is currently active. Based on this periodic detection, the filtering stage is reconfigured in real-time to match the detected band. This periodic monitoring and dynamic reconfiguration allows the system to maintain high receiving quality for the active band while preserving the ability to switch to and receive signals from other bands when they become active.
3Reliability
If the device uses a fixed filtering configuration for a single frequency band, then the receiving quality for that band is optimized, but the device cannot communicate in power grids using other frequency bands
Solution Approach 1:
The filtering stage is designed with multi-functionality to handle multiple frequency bands. It can be configured in different selection modes (first selection mode for CENELEC A band, second selection mode for FCC band) depending on the detected signal type. This universal design allows the same hardware filtering stage to serve multiple frequency bands, achieving both high receiving quality for the active band and compatibility with different power grid standards.
Solution Approach 2:
The filtering characteristics of the filtering stage are dynamically changed based on the detected PLC signal frequency band. The processing circuit analyzes the preamble to identify the frequency band and accordingly adjusts the filtering parameters (passband, stopband, cutoff frequencies) to match the active band. This parameter adaptation enables the device to maintain optimized receiving quality across different frequency bands without requiring separate fixed configurations for each band.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the electric meter to receive PLC signals from multiple frequency bands with improved signal quality and reduced noise, allowing seamless communication without disruption, even when bands share the same power grid.
Implementation Method 1
a filtering stage linked to an input of the receiving device and configurable in at least two modes comprising a default mode, wherein the filtering stage passes at least first PLC signals included in a first frequency band and second PLC signals included in a second frequency band separate from the first frequency band
Implementation Method 2
a processing circuit linked to the filtering stage and arranged to receive frames of PLC signals, and, for each received frame, to analyse a preamble of the frame in order to determine if the frame is a frame of first PLC signals or of second PLC signals
Data Source
AI summary
A receiving device for receiving PLC signals, including a filtering stage linked to an input of the receiving device and configurable in at least two modes including a default mode, wherein the filtering stage passes at least first PLC signals included in a first frequency band and second PLC signals included in a second frequency band separate from the first frequency band, and a first selection mode, in which the filtering stage passes the first PLC signals and stops the second PLC signals; and a processing circuit linked to the filtering stage and arranged to receive frames of PLC signals, and, for each received frame, to analyse a preamble of the frame, and to dynamically configure the filtering stage in the first selection mode if the frame is a frame of first PLC signals.