Multi-Port Power Line Impedance Matching Using Reflection Sensing
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Solution Overview
Problem
Current power line communication modems face challenges due to strong variations in input impedances at different locations and changing network topologies, which affect signal transmission and reception in power line networks, especially when using single input-single output schemes.
Innovation Solution
A device and method for power line communication that includes a transmitter and receiver with a sensor to determine reflection parameters and impedance matching units to match the output/input impedances of multiple ports to the power line transmission/reception paths, ensuring efficient signal transmission and reception by adapting impedance at each frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If impedance matching is performed for each frequency individually, then signal transmission quality is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting impedance matching parameters across different frequency ranges. The system divides the frequency spectrum into multiple ranges and applies different impedance matching strategies to each range, optimizing signal transmission quality while managing device complexity through selective parameter adjustment rather than complete individual matching at every frequency point.
2Productivity
If MIMO schemes are implemented to improve data rate and coverage, then communication performance is improved, but susceptibility to impedance variations and EMI increases
Solution Approach 1:
The patent implements dynamics by making the impedance matching adaptive and frequency-dependent. The system dynamically adjusts the impedance matching characteristics based on the operating frequency range, allowing the MIMO system to maintain optimal performance across different frequencies while reducing susceptibility to impedance variations and electromagnetic interference through frequency-selective matching.
Data Source
AI summary
A device for power line communication is provided, including a transmitter adapted to transmit signals on at least two of a plurality of power line transmission paths of a power line network; a sensor adapted to determine one or a plurality of reflection parameters of one of the plurality of power line transmission paths; and a transmission impedance matching unit adapted to match the output impedance of at least two output ports of the device which each couple to one of the plurality of transmission paths to the impedance of the at least two of the power line transmission paths based on the one or the plurality of reflection parameters. Further, a device including a corresponding reception impedance matching unit is provided and corresponding methods for transmitting and receiving signals.