Adaptive Mode Switching for Wireless Power and Information Transmission
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Solution Overview
Problem
Existing dual-mode simultaneous wireless power/information transmission systems face challenges in optimizing energy harvesting efficiency and data transmission rate, particularly in low power IoT environments, where the energy harvesting efficiency and data transmission rate vary based on battery status and received signal power, and the duty-cycling operation for self-powering is not effectively considered.
Innovation Solution
An adaptive mode switching method and apparatus that selectively switches between single tone and multi-tone modes based on the reception environment, using an energy harvesting unit, single tone and multi-tone information receiving units, and an adaptive mode switching control unit to optimize transmission rate and energy efficiency by determining a communication mode and modulation index, and controlling a time-division switch to adjust the duty ratio and modulation index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a mode switching threshold value is used to increase energy harvesting efficiency in the receiver, then energy harvesting efficiency is improved, but the optimum data transmission rate cannot be guaranteed
Solution Approach 1:
The patent implements dynamic mode switching between single-tone and multi-tone communication modes based on real-time received signal power measurements. The receiver adapts its communication mode dynamically rather than using a fixed threshold, allowing it to optimize both energy harvesting efficiency and data transmission rate according to current channel conditions. This dynamic adaptation resolves the contradiction by enabling the system to achieve high energy harvesting when signal power is low while maintaining adequate data transmission rates when signal power is high.
2Adaptability or versatility
If dual mode simultaneous wireless power/information transmission is used, then both power and information can be transmitted simultaneously, but the system cannot effectively consider duty-cycling operation for self-powering
Solution Approach 1:
The patent introduces duty-cycling operation where the receiver periodically switches between energy harvesting mode and information decoding mode. This periodic action allows the low-power device to harvest energy during dedicated time slots and decode information during other slots, making self-powering feasible. The duty cycle ratio can be adjusted based on battery status and channel conditions, enabling effective implementation of duty-cycling in dual mode SWIPT systems.
3Productivity
If single tone mode is used for high received signal power, then data transmission rate is improved, but energy harvesting efficiency decreases
Solution Approach 1:
The patent implements dynamic mode selection where the receiver measures received signal power and adaptively switches between single-tone and multi-tone modes. When received signal power is high, the system uses single-tone mode to achieve high data transmission rates. When received signal power is low, the system switches to multi-tone mode to maximize energy harvesting efficiency. This dynamic adaptation based on real-time channel conditions resolves the contradiction between data transmission rate and energy harvesting efficiency.
4Loss of energy
If multi-tone mode is used for low received signal power, then energy harvesting efficiency is improved, but data transmission rate decreases
Solution Approach 1:
The patent implements dynamic mode selection where the receiver measures received signal power and adaptively switches between single-tone and multi-tone modes. When received signal power is low, the system uses multi-tone mode to achieve high energy harvesting efficiency. When received signal power is high, the system switches to single-tone mode to maximize data transmission rate. This dynamic adaptation based on real-time channel conditions resolves the contradiction between energy harvesting efficiency and data transmission rate.
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 maintains optimal energy harvesting and data transmission rates by consistently updating the mode switching threshold value according to the reception environment, ensuring efficient operation of low power devices by balancing transmission rate and energy efficiency, and enabling self-powering through adaptive duty cycling.
Implementation Method 1
an energy harvesting unit which harvests an energy from a received signal which simultaneously transmits wireless power and information
Data Source
AI summary
The present disclosure relates to an adaptive mode switching method for simultaneous wireless power/information transmission operating in a dual mode and an apparatus for performing the same. The adaptive mode switching apparatus for simultaneous wireless power/information transmission operating in a dual mode includes: an energy harvesting unit; a single tone information receiving unit; a multi-tone information receiving unit; a time-division switch; and an adaptive mode switching control unit which determines a communication mode and a modulation index based on a battery status, the magnitude of the received signal, and a data transmission rate and controls the time-division switch in accordance with the selected communication mode and modulation index. It is possible to overcome a limited energy transmission area of simultaneous wireless power/information transmission (SWIPT) using a single tone in a low power IoT environment and a low transmission rate of a peak-to-average power ratio (PAPR)-based SWIPT using a multi-tone.