Wireless Sensing Self-Coupling Cancellation
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Solution Overview
Problem
Current wireless sensing methods rely on paired devices to analyze RF characteristics, which can be affected by self-interference, leading to inaccurate object location, direction, and speed measurements.
Innovation Solution
A method and device for wireless sensing that transmit a wireless signal to be scattered by an object, process the scattered signal to reduce or remove self-coupling interference, and determine object location, direction, and speed using a single transceiver device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current wireless sensing methods use paired devices to analyze RF characteristics, then device functionality is achieved, but self-interference reduces measurement precision
Solution Approach 1:
The patent measures and characterizes the self-coupling channel to create a digital spatial filter that actively cancels self-interference. By converting the harmful self-interference into a measurable and cancelable component, the system achieves high-precision sensing using a single device without requiring paired devices.
2Measurement precision
If paired devices are used for wireless sensing, then measurement accuracy is maintained, but device complexity and system configuration increase
Solution Approach 1:
The patent combines the transmitter and receiver into a single transceiver device, merging functions that traditionally required separate paired devices. By integrating both transmission and reception capabilities in one device and implementing self-interference cancellation, the system simplifies deployment while maintaining sensing accuracy.
Solution Approach 2:
The single transceiver device performs multiple functions: it acts as both a wireless router for WLAN communication and an intruder alarm for security monitoring. This multi-functionality eliminates the need for separate dedicated sensing devices, reducing system complexity.
3Ease of operation
If self-coupling is not compensated, then device operation is simpler, but noise in received signal increases
Solution Approach 1:
The system performs preliminary measurement and characterization of the self-coupling channel before actual sensing operations. By pre-computing the digital spatial filter based on measured self-coupling parameters, the system prepares the interference cancellation mechanism in advance, maintaining operational simplicity during actual use while effectively reducing noise.
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
Enables more accurate measurements of object location, direction, and speed by reducing self-interference, allowing a single device to function as both a wireless router and an intruder alarm without the need for paired devices.
Implementation Method 1
transmitting a wireless signal such that the transmitted wireless signal is scattered by an object so as to produce a scattered signal
Implementation Method 2
The self-coupling component may be received by the receiver directly from the transmitter. Self-coupling may arise because incomplete antennae matching or a portion of the transmitted signal may be reflected from discontinuities in the atmosphere in the vicinity of the transmitter as well as the mutual electromagnetic coupling between as a result of nearfield at the transmitter and receiver arrays.
Data Source
AI summary
There is herein provided a provided a method of wireless sensing that can include, at a transmitter which is a component of a transceiver device, transmitting a wireless signal such that the transmitted wireless signal is scattered by an object so as to produce a scattered signal, at a receiver which is a component of the transceiver device, receiving the scattered signal, performing processing on the wireless signal before it is transmitted and/or on the received scattered signal, the processing including an indication of self-coupling occurring at the transceiver device, following the processing, using the received signal to determine information relating to the object, the information including one or more of: a location of the object; a direction of movement of the object; or a speed of the object.