Wireless Power Path Identification Using Time-Reversed Multipath Signals
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Solution Overview
Problem
Current wireless charging technologies face challenges in efficiently delivering power over larger distances due to the need for precise location determination and signal transmission path computation in dynamic environments, which is complex and power-consuming.
Innovation Solution
The use of time reversal techniques based on arrival time diversity allows for coherent transmission signal generation and delivery by reversing the arrival times of incoming signals at an antenna array, enabling efficient power transmission without direct time of arrival measurements and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If wireless power transmission is performed at larger distances using sophisticated signal transmitting and receiving components, then power transmission capability is improved, but system complexity and power consumption increase
Solution Approach 1:
The patent applies time reversal technique by inverting the received signal waveform and transmitting it back to the original source. This inversion causes the signal to automatically compensate for multipath propagation effects and arrive back at the transmitter location with coherent combining, enabling simple retrodirective beamforming without complex phase and amplitude control circuits.
Solution Approach 2:
The system uses the client device's own transmitted signal as the reference for beamforming. The transmitter captures the signal, applies time reversal, and retransmits it, allowing the system to self-adjust to multipath conditions without requiring complex external calibration or control mechanisms.
2Measurement precision
If precise location determination and signal transmission path computation are performed in dynamic environments, then transmission accuracy is improved, but computational complexity and power consumption increase
Solution Approach 1:
The system uses the client device's own transmitted signal as the reference for beamforming. The transmitter captures the signal, applies time reversal, and retransmits it, allowing the system to self-adjust to multipath conditions without requiring complex external calibration or control mechanisms.
Solution Approach 2:
The patent changes the temporal parameter of the signal by applying time reversal to the received waveform. This parameter transformation automatically compensates for propagation delays and multipath effects, achieving precise signal focusing without complex computational algorithms for location determination.
3Reliability
If time reversal techniques are used to compensate for multipath propagation delays, then signal coherence is improved, but signal processing complexity increases
Solution Approach 1:
The patent applies time reversal technique by inverting the received signal waveform and transmitting it back to the original source. This inversion causes the signal to automatically compensate for multipath propagation effects and arrive back at the transmitter location with coherent combining, enabling simple retrodirective beamforming without complex phase and amplitude control circuits.
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 compensates for multipath propagation delays, ensuring that signals arrive at the destination simultaneously, thereby enhancing the efficiency and reliability of wireless power transmission while reducing power consumption.
Implementation Method 1
the signal transmitted from the client device may take multiple paths and thus arrive at the array of antennas at different times
Implementation Method 2
generating a coherent transmission signal by transmitting signals which are time reversed versions of the incoming signals at each antenna
Data Source
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AI summary
Various embodiments of the present technology relate generally to wireless power systems. More specifically, some embodiments relate to the use of time reversal techniques utilizing time diversity (e.g., different multipath arrivals at the same antenna) to achieve coherency from the same transmission node. For example, instead of initiating outgoing transmissions (e.g., power signals) at the same time, various embodiments can initiate the outgoing signals from the various antennas in a staggered timing that is a reversal of the arrival times of an incoming signal. As a result of staggering the start of the outgoing signals, the signals will arrive at the destination at approximately the same time even though they have traveled different paths having different propagation delays.