RF Sensing CIR Alignment via Tap Selection
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Solution Overview
Problem
Current wireless communication systems face challenges in providing consistent channel impulse response (CIR) reports for radio frequency (RF) sensing applications, leading to inaccurate identification of target objects and their movements due to inconsistent channel measurements across packets.
Innovation Solution
The method involves a responding device estimating a CIR from received signals and selecting specific taps based on a configuration for consistent CIR reports, which are then transmitted to an initiating device for alignment across multiple packets to accurately identify target objects and their movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If channel impulse response reports are generated from multiple packets without alignment, then more measurement data is available, but measurement precision deteriorates due to inconsistent channel measurements
Solution Approach 1:
The patent applies preliminary action by selecting and indicating specific reference taps in the channel impulse response reports before the alignment process. The responding device identifies and reports the indices of strongest or significant taps, which the initiating device then uses as reference points to align multiple CIR reports. This pre-selection of reference points enables consistent alignment across multiple packets, transforming the raw measurement data into precisely aligned measurements that accurately represent target object characteristics.
2Loss of information
If all taps in the channel impulse response are reported, then complete channel information is provided, but device complexity increases due to processing and transmitting all taps
Solution Approach 1:
The patent applies the extraction principle by selecting only the most significant taps from the channel impulse response for reporting. The responding device identifies taps based on criteria such as strongest amplitude or significant reflection characteristics, and reports only these selected taps along with their indices. This extraction of essential information maintains the completeness of relevant channel information while dramatically reducing the processing burden and data transmission requirements compared to reporting all taps.
Solution Approach 2:
The patent applies local quality by treating different taps in the channel impulse response differently based on their significance. Instead of uniformly processing all taps, the system identifies and prioritizes specific local regions or individual taps that contain the most important reflection information. This selective approach allows the system to focus computational resources on the most informative portions of the channel response, reducing overall complexity while preserving essential information.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, an initiating device may transmit a signal that includes multiple packets. The initiating device may receive, from a responding device, a channel impulse response (CIR) report for each packet of the multiple packets. The initiating device may align, using one or more taps in the CIR report for each packet, the CIR reports across the multiple packets to identify a target object, a location of the target object, or a movement of the target object. The initiating device may perform an action based at least in part on the target object, the location of the target object, or the movement of the target object. Numerous other aspects are described.