Ambient IoT Backscatter Modulation With Adaptive Symbol Duration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ambient Internet of Things (IoT) devices with low power consumption face challenges in efficient digital baseband modulation, particularly in backscattering communication, where modulation schemes are limited and power-efficient methods are needed.
Innovation Solution
A wireless transmit/receive unit (WTRU) is configured to determine an association between modulation order and symbol duration, transmit a calibration signal, and receive a signal to determine data bits based on phase, using line codes or subcarrier signals, with parameters derived from network configurations or previous transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If backscattering modulation is used in ambient IoT devices, then power consumption is reduced to microwatt levels, but modulation schemes are limited and power-efficient methods are needed
Solution Approach 1:
The patent implements dynamic adaptation of modulation order and symbol duration based on channel conditions and device capabilities. The system transitions from static modulation schemes to dynamic selection, allowing ambient IoT devices to adapt their modulation parameters (QPSK, 8PSK, 16QAM, etc.) and symbol durations according to real-time requirements, thereby resolving the contradiction between power efficiency and modulation flexibility
Solution Approach 2:
The patent changes key transmission parameters including modulation order (M=2, 4, 8, 16) and symbol duration (Ts) to optimize performance. By allowing these parameters to vary based on channel quality, device power constraints, and traffic requirements, the system achieves both power efficiency at microwatt levels and adaptable modulation schemes for different operational scenarios
2Device complexity
If fixed modulation schemes are used, then device complexity is reduced, but communication performance cannot be optimized for varying channel conditions
Solution Approach 1:
The patent performs preliminary configuration of modulation parameters through calibration signals exchanged between the reader and ambient IoT device. The reader transmits calibration signals, the device measures channel conditions, and both parties pre-determine optimal modulation orders and symbol durations before actual data transmission. This preliminary action enables performance optimization without requiring complex real-time decision-making during data transmission
Solution Approach 2:
The patent implements feedback mechanisms where the reader measures received signal quality and provides information to the device about optimal modulation parameters. The device also provides feedback about its capabilities and measured channel conditions. This bidirectional feedback enables the system to adapt modulation schemes to varying channel conditions while maintaining manageable device complexity through distributed intelligence
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
Enhances power efficiency and modulation accuracy in ambient IoT devices by adaptively determining modulation orders and symbol durations, optimizing communication performance.
Implementation Method 1
The devices may transmit using backscattering. In backscattering, a device reflects a received radio frequency (RF) signal after modulating the signal using a baseband signal.
Data Source
AI summary
A wireless transmit/receive unit (WTRU) may be configured to determine an association between a modulation order and a symbol duration. The WTRU may be configured to transmit a calibration signal. The WTRU may be configured to transmit a broadcast configuration message. The WTRU may be configured to receive a signal with a frequency corresponding to a chip duration. The WTRU may be configured to determine a modulation order of the received signal. The WTRU may be configured to determine data bits of the received signal based on a phase of the received signal over a duration of the symbol duration and the determined modulation order. The modulation order may be a number of phases that a device transmits using a line code or a subcarrier signal. A symbol duration may comprise one or more data bits or chips.