Auxiliary Signal Design for Concurrent Wireless Power and Data
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Solution Overview
Problem
Current wireless communication systems face challenges in concurrently delivering energy and information to devices with different power and signal requirements, such as IoT devices and implantable devices, where passive and semi-passive receivers need optimized signal design to maximize energy harvesting efficiency while maintaining information receiver performance.
Innovation Solution
The system employs a base transmission signal and an auxiliary transmission signal with a high peak-to-average power ratio (PAPR) to enhance energy harvesting efficiency for EH devices without significantly impacting the overall signal PAPR, using narrowband energy harvesting signals and adaptive auxiliary signals that are signaled and adapted to mitigate interference with information receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a signal with high PAPR is transmitted to enhance energy harvesting efficiency, then energy harvesting efficiency is improved, but information receiver performance deteriorates due to interference
Solution Approach 1:
The transmitted signal is segmented into two distinct components: a base information signal and an auxiliary PAPR-enhancing signal. The base signal carries information for information receivers, while the auxiliary signal is specifically designed to enhance PAPR for energy harvesting receivers. This segmentation allows each signal component to be optimized for its specific purpose without compromising the other.
Solution Approach 2:
The auxiliary signal acts as an intermediary that mediates between the conflicting requirements of information transmission and energy harvesting. By introducing this intermediate signal component, the system can enhance energy harvesting efficiency through PAPR enhancement while the base signal continues to provide information transmission. The auxiliary signal is designed to be cancelable at information receivers, thus mediating the interference issue.
2Use of energy by moving object
If an auxiliary signal is added to enhance PAPR characteristics, then energy harvesting efficiency is improved, but signal complexity increases
Solution Approach 1:
The auxiliary signal is designed by changing specific parameters of the transmitted signal, particularly the PAPR parameter. By adjusting the PAPR characteristics of the auxiliary signal component, the system enhances energy harvesting efficiency without fundamentally changing the overall signal structure. The auxiliary signal parameters are optimized to provide PAPR enhancement while maintaining manageable complexity levels.
3Use of energy by moving object
If narrowband energy harvesting signals are used to provide high PAPR, then energy harvesting efficiency is improved, but overall signal bandwidth requirements increase
Solution Approach 1:
The auxiliary PAPR-enhancing signal is designed with local quality characteristics, being concentrated in specific frequency sub-bands rather than uniformly distributed across the entire bandwidth. This allows the signal to provide high PAPR in the regions where energy harvesting receivers operate, while maintaining a compact overall bandwidth structure. The local concentration of PAPR-enhancing characteristics optimizes energy harvesting without unnecessarily expanding the total signal bandwidth.
Data Source
AI summary
A base transmission signal and an auxiliary transmission signal may be used to (e.g., concurrently) improve a harvesting efficiency of an energy receiver while maintaining a prespecified performance level of an information receiver. An auxiliary transmission signal may be constructed. The construction of the auxiliary transmission signal may be signaled. An auxiliary transmission signal may be adapted. The adaptation of the auxiliary transmission signal may be signaled. An impact of auxiliary transmission signals on an information receiver's performance may be mitigated. One or more narrowband energy harvesting (EH) signals may be used, for example to provide a high peak to average power ratio (PARR) for EH devices (e.g., without significantly impacting overall transmitted signal PARR) characteristics. One or more narrowband auxiliary signals may be used, for example to enhance the PARR characteristics of an information signal sub-band.