Wireless Power In-Band Channel Equalization for Higher Data Rates
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Solution Overview
Problem
Wireless power transfer systems face bandwidth limitations due to physical and electrical constraints, leading to suboptimal communication channels that can result in inter-symbol interference and degraded communication quality.
Innovation Solution
The method involves a wireless power transmitter receiving a characterizing signal from the receiver, computing parameters such as time constant and damping value, and applying equalizing filter taps to enhance the communication channel bandwidth, allowing for higher data rate communications by compensating for channel filtering effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If in-band communications are used for wireless power transfer, then power can be transferred wirelessly, but bandwidth limitations occur due to physical and electrical constraints
Solution Approach 1:
The system performs preliminary channel characterization by transmitting a characterizing signal before normal communication. This advance measurement allows the receiver to compute channel parameters (time constant, damping value) and determine equalization filter taps in advance, so that when high-rate communication begins, the bandwidth limitations have already been compensated for through the pre-computed equalization filters
Solution Approach 2:
The system changes the electrical parameters of the communication channel by applying equalization filters that modify the frequency response. The filter taps are computed based on measured channel parameters (time constant τ and damping ζ), and these filters effectively change the electrical characteristics of the channel to compensate for its inherent bandwidth limitations, allowing higher data rate communication
2Productivity
If higher data rate communications are attempted, then communication bandwidth increases, but inter-symbol interference increases due to channel filtering effects
Solution Approach 1:
The system uses feedback by having the receiver measure the actual channel response to a characterizing signal and communicate this information back to the transmitter. The receiver computes the channel parameters and equalization filter taps based on this measured feedback, then applies these filters to the received signals to compensate for inter-symbol interference and maintain communication quality at higher data rates
Solution Approach 2:
Equalization filter taps are computed in advance during a training phase before high-rate communication begins. This preliminary computation of equalization parameters allows the system to pre-compensate for channel effects, enabling higher data rates without excessive inter-symbol interference during actual data transmission
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
This approach effectively increases the available bandwidth of the communication channel, reducing inter-symbol interference and improving communication quality by adapting to various physical and electrical conditions.
Implementation Method 1
a wireless power transmitter coil that receives the AC output voltage from the inverter and delivers power to a wireless power receiver by magnetic coupling
Data Source
AI summary
A wireless power transmitter can receive the results of a characterizing signal transmitted by the wireless power receiver, compute at least two parameters of a model characterizing an in-band communications channel based on the received results of the characterizing signal transmitted by the wireless power receiver, compute a plurality of equalizing filter taps from the at least two parameters, and apply the computed equalizing filter to subsequent signals received by the wireless power transmitter via the in-band communications channel. A first parameter can correspond to a time constant of the channel, and a second parameter can correspond to a damping value of the communications channel. The wireless power transmitter can transmit to a wireless power receiver a request to transmit a characterizing signal through the in-band communication channel, wherein the characterizing signal transmitted by the wireless power receiver is sent in response to the transmitted request.