Single-Device RF Sensing With Concurrent Transmit and Receive
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Solution Overview
Problem
Existing RF sensing technologies require two wireless devices for channel capture, which limits their application in scenarios with only a single device or low wireless traffic, and introduces interoperability issues and ambiguity in motion detection.
Innovation Solution
A single wireless device is used for concurrent transmission and reception, eliminating the need for a second device and reducing ambiguity by utilizing a single-chain transmit and receive operation with RF sensing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two wireless devices are used for channel capture, then RF sensing can be performed, but device complexity and interoperability issues increase
Solution Approach 1:
The patent combines transmit and receive functions into a single wireless device. The transceiver is configured to concurrently perform transmission on a first channel and reception on a second channel, eliminating the need for separate transmit-only and receive-only devices. This merging resolves the technical contradiction by maintaining RF sensing capability while reducing the number of devices from two to one.
Solution Approach 2:
The wireless device is designed with universal functionality to both transmit and receive RF signals simultaneously through its transceiver. The transceiver can operate in full-duplex mode, handling both transmission and reception functions within a single device architecture. This multi-functionality eliminates interoperability issues between separate devices and reduces system complexity.
2Reliability
If two wireless devices are used for channel capture, then RF sensing can be performed, but motion detection ambiguity increases
Solution Approach 1:
The single wireless device captures channel state information from signals it transmits and receives. By using its own transmitted signal as the reference and comparing it with the received signal, the device creates a feedback loop that eliminates ambiguity about which device is moving. The channel capture process uses the known transmitted signal to precisely measure changes in the wireless channel caused by motion.
3Adaptability or versatility
If concurrent transmit and receive is performed on the same channel, then single-device operation is enabled, but self-interference increases
Solution Approach 1:
The patent segments the channel into at least two different channels - a first channel for transmission and a second channel for reception. This frequency or spatial segmentation allows the transceiver to concurrently transmit and receive without the transmitted signal overwhelming the received signal, thereby reducing self-interference while enabling single-device operation.
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 RF sensing in single-device scenarios and improves motion detection accuracy by removing interoperability issues and ambiguity, allowing applications like indoor mapping and user gesture detection.
Implementation Method 1
receiving a reflected signal with the receive channel on the wireless device at a second time, such that the reflected signal is based on the radio frequency signal reflecting from the object
Implementation Method 2
determining the distance to the object based at least in part on a difference between the first time and the second time
Data Source
AI summary
Techniques are provided for radio frequency (RF) sensing. An example method for determining a distance to an object with radio frequency sensing includes: setting a receive gain of a receive channel on a wireless device to a first level; transmitting at least one RF signal a first number of times with a transmit channel on the wireless device; receiving a leakage signal with the receive channel at a first time, where the receive gain is set to the first level; setting the receive gain of the receive channel to a second level; receiving at least one reflected signal with the receive channel at a second time; and determining the distance to the object based at least in part on a difference between the first time and the second time.