Backscatter Positioning Timing for Energy-Harvesting Devices
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Solution Overview
Problem
In wireless communication systems, energy harvesting devices face challenges in accurately determining the timing of backscatter signal transmission, leading to increased complexity and reduced reliability in positioning measurements due to unknown transmission times.
Innovation Solution
An energy transfer device transmits parameters including an identifier and a time offset to an energy harvesting device, enabling it to apply a backscattering function and transmit a backscattered positioning signal based on the received time offset, allowing the energy transfer device to calculate the energy harvesting device's position based on the time of reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the energy harvesting device transmits backscatter signal without precise timing information, then the device complexity is reduced, but the positioning measurement reliability deteriorates
Solution Approach 1:
The energy transfer device transmits timing information (time offset) to the energy harvesting device before the backscatter transmission occurs. This preliminary provision of timing parameters enables the energy harvesting device to synchronize its backscatter signal transmission accurately, resolving the contradiction by maintaining device simplicity while ensuring positioning reliability through pre-configured timing information.
2Measurement precision
If the energy transfer device provides detailed timing parameters, then the positioning accuracy is improved, but the signaling overhead increases
Solution Approach 1:
The patent transmits timing information in the form of a time offset parameter rather than complete timing sequences. This parameter transformation approach conveys essential timing synchronization information with minimal signaling overhead, enabling accurate positioning measurements while maintaining efficient communication between devices.
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 simplifies the positioning process by reducing complexity and improving reliability by ensuring synchronized backscatter signal transmission, enhancing the accuracy of energy harvesting device location determination.
Implementation Method 1
A wireless device may harvest energy from received signals and may use the harvested energy to perform backscattered transmissions
Implementation Method 2
wireless devices may communicate with one another via energy harvesting and backscatter communication
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some wireless communications systems, a first wireless device, such as an energy harvesting device, may receive, from a second wireless device, such as an energy transmitting device, parameters associated with backscattering a positioning signal, the parameters including an identifier associated with the first wireless device and an indication of a time offset associated with transmission of a backscattered positioning signal. The first wireless device may receive the positioning signal based on the identifier and transmit the backscattered positioning signal based on applying a backscattering function to the positioning signal in accordance with the offset. The second wireless device may calculate a position of the first wireless device based on a time of reception of the backscattered positioning signal and the time offset.