Dynamic PLC Signal Filtering for Multi-Band Reception Quality
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Solution Overview
Problem
Existing PLC signal reception devices face challenges in effectively receiving and decoding signals from multiple coexisting frequency bands, such as CENELEC-A and FCC, due to interference, which hinders their use in diverse electrical networks without modification.
Innovation Solution
A PLC signal reception device with a filtering stage and processing circuit that dynamically configures itself based on the preamble analysis of incoming frames to optimize reception and rejection of signals from different frequency bands, ensuring excellent signal-to-noise ratio and compatibility with multiple bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the filtering stage is configured to let through both first PLC signals (CENELEC-A band) and second PLC signals (FCC band) simultaneously, then the device can communicate in multiple frequency bands, but the reception quality deteriorates due to interference from coexisting signals
Solution Approach 1:
The filtering stage is configured dynamically based on the detected frequency band. The processing circuit analyzes the preamble of received frames to identify whether they belong to CENELEC-A or FCC band, then automatically adjusts the filter configuration accordingly. This dynamic adaptation allows the device to maintain optimal reception quality while supporting multiple frequency bands.
Solution Approach 2:
Different filtering characteristics are applied locally for different frequency bands. The filter is optimized with specific passband and stopband characteristics tailored to each band (CENELEC-A: 35-91 kHz, FCC: 154-488 kHz). This localized optimization ensures that each band receives appropriate filtering treatment, maximizing signal quality while rejecting out-of-band interference.
2Reliability
If the filtering stage uses a fixed configuration optimized for one frequency band, then the reception quality for that band is improved, but the device cannot effectively receive signals from other frequency bands
Solution Approach 1:
The filter configuration transitions from static to dynamic. The processing circuit continuously monitors incoming signals, identifies the active frequency band through preamble analysis, and reconfigures the filtering stage in real-time. This enables the same hardware to be optimally adapted to different frequency bands without requiring multiple dedicated receivers.
Solution Approach 2:
A single filtering stage is designed to serve multiple frequency bands through reconfigurable parameters. By making the filter universal and adaptable to different bands (CENELEC-A, FCC, ARIB), the device achieves multi-functionality without requiring separate filtering paths for each band, reducing complexity while maintaining performance.
3Reliability
If the device dynamically reconfigures the filtering stage for each received frame based on preamble analysis, then the signal-to-noise ratio is optimized, but the processing time and complexity increase
Solution Approach 1:
The filtering stage is pre-configured with multiple preset filter profiles corresponding to different frequency bands. Instead of performing complex real-time optimization calculations, the system simply selects and switches between pre-optimized filter configurations based on the detected band. This preliminary preparation significantly reduces processing complexity while maintaining optimal SNR performance.
Solution Approach 2:
The system employs feedback through preamble analysis to automatically detect the active frequency band and trigger appropriate filter reconfiguration. This closed-loop approach ensures the filter is always optimally configured for the current signal without requiring manual intervention or complex adaptive algorithms, balancing performance with simplicity.
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 reception of PLC signals from multiple frequency bands with improved signal quality and reduced interference, allowing the device to operate seamlessly in networks using multiple bands without disturbance, thus enhancing its market versatility.
Implementation Method 1
a filtering stage connected to an input of the reception device and configurable according to at least two modes including a default mode, in which the filtering stage lets through at least first PLC signals included in a first frequency band and second PLC signals included in a second frequency band distinct from the first frequency band
Data Source
Figure 1
Figure 2a~2c
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AI summary
PLC signal receiving device, comprising: - a filtering stage (3) connected to an input (E) of the receiving device and configurable according to at least two modes including a default mode, in which the filtering stage (3) allows at least of the first PLC signals included in a first frequency band and of the second PLC signals included in a second frequency band distinct from the first frequency band to pass, and a first selection mode, in which the filtering stage allows the first PLC signals to pass and prevents the second PLC signals from passing;- a processing circuit (4) connected to the filtering stage (3) and arranged to receive PLC signal frames, and, for each received frame, to analyze a preamble of the frame so as to determine whether the frame is a frame of first PLC signals or second PLC signals, and to dynamically configure the filtering stage (3) in the first selection mode if the frame is a frame of first PLC signals so as to optimize the reception and decoding of said frame.;