RF Signal Differentiation for Wireless Power and Data Transmission
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently transmitting power and data between a base station and a passive transponder due to signal noise competition, requiring complex and costly circuitry, especially in applications like keyless entry and vehicle operation.
Innovation Solution
The system employs signal differentiation techniques, such as separate antenna coils, frequency differentiation, phase modulation, and signal subtraction/cancellation, to mitigate noise interference and accurately detect data signals, allowing for effective communication of power and data using radio frequency signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single radio frequency signal is used to transmit both power and data, then the system complexity is reduced, but signal noise interference increases and data detection accuracy deteriorates
Solution Approach 1:
The patent segments the radio frequency signal transmission into separate channels: a first RF signal carries power and a second RF signal carries data. By separating the power and data transmission paths, the system avoids noise interference between the two functions while maintaining relatively simple overall circuitry architecture.
Solution Approach 2:
The patent introduces an intermediary approach by using a combined RF signal that carries both power and data simultaneously through modulation techniques. This mediator signal allows both power and data to coexist in the same transmission medium without requiring completely separate physical channels.
2Power
If the power supplied by the base station is increased to ensure adequate power delivery over distance, then the power transmission effectiveness is improved, but the signal noise increases and competes with data signals
Solution Approach 1:
The patent segments the power and data signals into separate RF signals. The first RF signal is optimized for power transmission with sufficient power levels, while the second RF signal carries data at lower power levels without being affected by the high power transmission noise.
Solution Approach 2:
The patent changes the parameters of the RF signals by using different modulation schemes and frequency characteristics for power and data transmission. The power signal uses parameters optimized for energy delivery, while the data signal uses parameters optimized for noise-resistant detection.
3Measurement precision
If complex circuitry is used to separate power and data signals, then data detection accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
The patent uses an intermediary combined RF signal approach where both power and data are transmitted through a unified communication interface. This mediator architecture simplifies the overall system design compared to completely separate power and data systems, while still achieving adequate detection accuracy through signal processing techniques.
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 enables reliable and efficient communication of power and data between the base station and transponder, reducing noise interference and simplifying circuitry, thus improving the operational efficiency and cost-effectiveness of wireless communication systems.
Implementation Method 1
a first radio frequency signal is communicated between a base station and a transponder powered by the base station
Implementation Method 2
the transponder that receives the first radio frequency signal from the base station and uses power in the first radio frequency signal to generate and transmit a second radio frequency signal
Data Source
AI summary
Communications between a base station and a transponder that is powered by the base station are effected using a signal differentiation approach. A first radio frequency signal is communicated between the base station and the transponder to power the transponder, with the first radio frequency signal including noise and data for authenticating communications between the base station and the transponder. A second radio frequency signal is communicated between the base station and the transponder, with the second radio frequency signal including data for authenticating communications between the base station and the transponder. The detection of noise presented via the first radio frequency signal is mitigated while detecting data in the second radio frequency signal, via signal differentiation.