Power Line MIMO Impedance Matching Using Reflection Sensing
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Solution Overview
Problem
Current power line communication modems face challenges due to variations in input impedances at different locations and changing network topologies, which affect signal transmission and reception in power line networks, particularly in MIMO schemes where electromagnetic interference and strong signal reflections are prevalent.
Innovation Solution
A device and method for power line communication that includes a transmitter and receiver with sensors to determine reflection parameters and impedance matching units to adjust output and input impedances of multiple ports to match the impedance of power line transmission and reception paths, ensuring efficient signal transmission and reception across various frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO schemes are used to improve data rate and coverage, then signal transmission performance is improved, but electromagnetic interference and signal reflections increase
Solution Approach 1:
The patent employs feedback mechanisms where the system measures reflection parameters and impedance characteristics of the power line network, then adjusts transmission signals accordingly. This allows the MIMO system to adapt to changing network conditions and minimize interference while maintaining high data rates.
Solution Approach 2:
The system dynamically changes transmission parameters such as signal frequency, amplitude, and phase based on measured network conditions. By adjusting these parameters in real-time, the system optimizes performance across multiple transmission paths while reducing electromagnetic interference and signal reflections.
2Reliability
If impedance matching is performed for multiple power line paths, then signal transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple impedance matching operations into a unified process. By measuring reflection parameters once and using this information to match impedances across multiple transmission paths simultaneously, the system achieves efficient signal transmission without proportionally increasing device complexity.
Solution Approach 2:
The impedance matching unit is designed to handle multiple power line paths with a single measurement of reflection parameters. This multi-functional approach allows the same hardware components to serve multiple transmission paths, reducing overall device complexity while maintaining transmission efficiency.
3Measurement precision
If reflection parameters are measured at each frequency individually, then impedance matching precision is improved, but measurement time increases
Solution Approach 1:
The system performs preliminary measurements of reflection parameters that can be applied across multiple frequencies. By capturing comprehensive reflection data in advance and using this information for impedance matching at different frequencies, the system maintains precision while reducing the time required for repeated measurements.
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.