RF Signal Diffuser for Multipath Sensing Coverage
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Solution Overview
Problem
Conventional RF sensing techniques are constrained by their radio environments, limiting the number of transmission channels for multi-dimensional information about human postures and requiring optimization of reconfigurable intelligent surfaces (RIS) for high recognition accuracy.
Innovation Solution
An RF system with a first node and an RF signal diffuser that reflects RF signals in multiple directions to generate additional paths for a multipath channel, ensuring uniform distribution of wireless energy and reducing blind spots, allowing improved RF-based sensing coverage and occupancy detection consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional RF sensing techniques are used, then the system structure remains simple, but the number of transmission channels is limited and blind spots exist in the sensing area
Solution Approach 1:
The patent introduces an RF signal diffuser as an intermediary component that reflects RF signals to create additional multipath channels. This diffuser acts as a mediator between the transmitter and receiver, generating virtual transmission paths without requiring complex multi-antenna arrays or reconfigurable intelligent surfaces, thus increasing channel diversity while maintaining system simplicity
Solution Approach 2:
The patent utilizes spatial reflection dimensions by positioning the RF signal diffuser at specific locations and angles to create additional signal paths. By exploiting the dimensional space for signal reflection rather than adding more transmitting antennas, the system increases the number of effective transmission channels through spatial multipath propagation
2Area of stationary object
If the number of paths is increased to improve coverage, then blind spots are reduced, but the contribution of each individual path is reduced
Solution Approach 1:
The patent creates a more uniform distribution of signal energy across the sensing area by introducing multiple reflected paths through the RF signal diffuser. This homogenizes the signal contribution across different spatial locations, reducing the dominance of any single strong path and improving overall sensing reliability through balanced multipath diversity
3Measurement precision
If reconfigurable intelligent surfaces are used to optimize transmission channels, then recognition accuracy improves, but the system complexity and optimization difficulty increase
Solution Approach 1:
The patent replaces complex, expensive reconfigurable intelligent surfaces with a simpler RF signal diffuser structure that achieves similar or comparable performance. The diffuser provides sufficient multipath channel diversity without requiring intelligent configuration or optimization algorithms, effectively substituting a complex adaptive system with a simpler static or passive structure
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 system enhances spatial richness and fine-tunes RF-based sensing by increasing the number of paths, reducing path bias, and enabling high-value functions like vital sign detection, with a simpler structure than multi-antenna arrays.
Implementation Method 1
The RF signal diffuser is configured for reflecting the RF signal in multiple directions in order to generate additional paths for a multipath channel based on the RF signal
Data Source
AI summary
The present invention relates to an RF system (100) with a first node (10) and an RF signal diffuser (40). The first node (10) is configured for transmitting an RF signal (30). The RF signal diffuser (40) is configured for reflecting the RF signal (30) in multiple directions in order to generate additional paths (38) for a multipath channel based on the RF signal (30). The RF signal diffuser (40) and the first node (10) are arranged with a distance (50) to each other and are configured such that at least one of the additional paths (38) of the multipath channel has sufficient transmission power for performing RF-based sensing in a sensing area (60). The RF system (100) is configured for performing RF-based sensing based on at least two paths (36, 38) of the multipath channel including at least the one of the additional paths (38).