LAE Passive Backscattering Beamformer for IoT SNR
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Solution Overview
Problem
Existing passive backscattering systems for IoT and 5G networks face challenges with low signal-to-noise ratio (SNR) and short communication distance due to the 1/d^4 Friis path loss, limiting their effectiveness in wide-scale deployment.
Innovation Solution
The implementation of a passive backscattering beamformer based on large-area electronics (LAE) technology, which enhances backscattered signal power through scalable aperture size, configurable beamforming, frequency-shift keying for SNR enhancement, and frequency division multiplexing for increased data bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If passive backscattering is used for low-power communication, then power consumption is reduced, but signal-to-noise ratio and communication distance deteriorate due to 1/d^4 Friis path loss
Solution Approach 1:
The patent transitions from isotropic scattering in all directions to directional beamforming by controlling phase and amplitude across multiple antenna elements. This spatial dimensionality transformation concentrates the backscattered energy in specific directions, achieving quadratic signal power enhancement with aperture size while maintaining passive operation.
Solution Approach 2:
The system divides the backscattering function across multiple antenna elements arranged in an array. Each element contributes to the overall beamforming pattern, allowing independent phase and amplitude control to achieve constructive interference in desired directions and destructive interference in others, thereby improving SNR without increasing power consumption.
2Reliability
If aperture size is increased to enhance signal power quadratically, then signal-to-noise ratio improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent integrates multiple antenna elements and their associated phase shifters and amplitude controllers into a single coherent array structure. This merging approach allows the system to achieve quadratic signal enhancement through coordinated operation of all elements, while the modular array architecture keeps the complexity manageable through standardized unit cells.
Solution Approach 2:
The system employs dynamically controllable phase shifters and amplitude controllers at each antenna element, allowing real-time adjustment of beamforming parameters. This dynamic control enables the aperture to be electronically reconfigured without physical movement, achieving adaptive beamforming that maximizes SNR while maintaining a fixed physical structure.
3Length of stationary object
If beamforming is implemented to enhance backscattered signal power, then communication distance increases, but system complexity and manufacturing precision requirements increase
Solution Approach 1:
The patent achieves beamforming by electronically adjusting phase and amplitude parameters at each antenna element rather than relying on precise physical positioning. This parameter-based control allows tolerance in manufacturing while maintaining beamforming performance, as the electronic calibration can compensate for physical variations in element positions and characteristics.
Solution Approach 2:
The system incorporates calibration and self-adjustment mechanisms that allow the beamforming array to automatically compensate for manufacturing variations. Through self-calibration procedures, the system optimizes its performance by adjusting phase and amplitude parameters to account for physical imperfections, reducing the impact of manufacturing precision limitations.
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
The LAE-based passive backscattering beamformer significantly increases SNR and communication distance by quadratically enhancing signal power with aperture size, while also improving data bandwidth and reliability.
Implementation Method 1
passive backscattering nodes that can piggyback on ubiquitous 2.4 GHz Wi-Fi signals
Implementation Method 2
introducing beamforming using large-area electronics (LAE) technology to achieve adequate and scalable aperture size
Implementation Method 3
frequency-shift keying for data modulation and SNR enhancement, by shifting the signal away from the incident interferer
Data Source
AI summary
Systems and methods disclosed herein provide for a passive backscattering beamformer based on large-area electronics (LAE). Low power is critical for distributed nodes in future IoT/5G networks. A key emerging solution is using ubiquitous 2.4 GHz Wi-Fi infrastructure with passive backscattering nodes, for low-power communication. LAE enables monolithic integration of devices over large and flexible substrates, with recent advances into the gigahertz regime opening new opportunities for wireless systems. An LAE passive backscattering beamformer is chosen that is capable of (1) enhancing the backscattered signal power in a scalable manner enabled by LAE's monolithic integrability over meter-scale area; (2) configuration between constructive/destructive beamforming; (3) frequency-shift keying for data modulation and SNR enhancement, by shifting the signal away from the incident interferer; and (4) frequency division multiplexing for increasing data bandwidth.