BPL Subcarrier Usability Assessment via Impulse Response
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Solution Overview
Problem
Existing methods for evaluating the usability of subcarriers in BPL signals during ongoing operation are inadequate, as they require inactivity phases and fail to promptly respond to changing interfering signals, leading to potential interference with radio services.
Innovation Solution
A method that involves extracting received values from BPL subcarriers, equalizing them using an estimated transfer function, and determining symbol usability by analyzing the difference between received and processed signals, allowing for continuous assessment and adaptation during system operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the complete frequency spectrum is scanned before PLC activity to detect radio sources, then detection accuracy is improved, but the response time to changing interfering signals deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the impulse response of the transmission channel during PLC inactivity phases. This preprocessing allows the system to rapidly assess subcarrier usability during active PLC operation without performing complete spectrum scans, thus maintaining detection accuracy while enabling fast response to changing interfering signals.
Solution Approach 2:
The patent implements dynamics by transitioning from static pre-activity spectrum scanning to dynamic continuous assessment during PLC operation. The system continuously monitors subcarrier usability by comparing received signals with stored impulse responses, allowing real-time adaptation to changing radio interference conditions while maintaining PLC activity.
2Difficulty of detecting and measuring
If PLC activity is interrupted to perform spectrum scanning, then detection capability is improved, but system productivity deteriorates
Solution Approach 1:
The patent applies continuity of useful action by enabling simultaneous PLC transmission and interference detection. The system continuously assesses subcarrier usability during PLC operation by utilizing stored impulse responses and comparing them with currently received signals, eliminating the need to interrupt PLC activity for detection and maintaining continuous productive operation.
Solution Approach 2:
The patent uses preliminary action by pre-computing and storing the impulse response characteristics during inactivity phases. This preparation enables rapid continuous assessment during active PLC operation without requiring interruptions, thus maintaining both detection capability and system productivity.
3Reliability
If static notching is applied to protect radio services, then coexistence reliability is improved, but frequency spectrum utilization deteriorates
Solution Approach 1:
The patent implements dynamics by replacing static notching with dynamic subcarrier usability assessment. The system continuously evaluates each subcarrier's usability by comparing received signals with stored impulse responses, enabling real-time adaptation to changing radio interference conditions. This allows selective masking of only those subcarriers currently experiencing interference, optimizing frequency spectrum utilization while maintaining coexistence reliability.
Solution Approach 2:
The patent applies local quality by treating each subcarrier individually rather than applying blanket static notching. The system assesses and masks only specific subcarriers that are currently affected by radio interference, preserving the usability of other subcarriers in the same frequency range. This localized approach maintains coexistence reliability while maximizing overall frequency spectrum utilization.
Data Source
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AI summary
The invention relates to a method for evaluating the usability of a sub-carrier of a BPL (broadband power-line) signal, in particular in order to avoid mutual influencing of the BPL signal and a further signal, wherein the BPL signal has a plurality of sub-carriers and one symbol can be transmitted in each of the sub-carriers. Said method comprises the following steps: extracting a received value y[k] from a sub-carrier of a received BPL signal, rectifying the received value y[k] using an estimated transfer function Ĥ of the transmission channel, deciding on a symbol d[k] that is coded in the received value y[k], distorting the symbol d[k] using the estimated transfer function Ĥ of the transmission channel, calculating a difference between the received value y[k] and the processed signal d[k] ⋅ Ĥ, and deciding on the usability of the sub-carrier on the basis of the difference y[k] - d[k] ⋅ Ĥ.