Channel Impulse Response Alignment for RF Object Tracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems lack efficient methods for accurately determining the location and movement of target objects using channel impulse responses (CIR) in radio frequency sensing.
Innovation Solution
The method involves estimating a CIR that represents signal reflections from objects as multiple taps, selecting taps within a specified time window, and transmitting a CIR report to identify the target object or its movement, while the initiating device aligns CIR reports across multiple packets to determine the object's location or movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel impulse response (CIR) is used for radio frequency sensing to identify target objects and their movement, then measurement precision is improved, but device complexity increases due to the need for aligning CIR reports across multiple packets from multiple transmit antennas
Solution Approach 1:
The patent applies preliminary action by pre-aligning the CIR reports before processing. The initiating device aligns the CIR reports from multiple packets using reference taps identified in advance, which simplifies the subsequent processing and reduces the complexity of real-time alignment operations.
Solution Approach 2:
The patent uses reference taps as an intermediary element to facilitate the alignment of CIR reports. These reference taps serve as mediator points that enable the initiating device to synchronize and align the impulse responses from multiple transmit antennas and packets, thereby improving measurement precision without directly managing the complex alignment process.
2Measurement precision
If multiple packets from multiple transmit antennas are transmitted to improve sensing accuracy, then measurement precision is improved, but loss of time increases due to the need to collect and align multiple CIR reports
Solution Approach 1:
The patent applies preliminary action by pre-aligning the CIR reports using reference taps before final processing. This preliminary alignment reduces the time required for subsequent processing operations, as the reports are already synchronized and ready for analysis, thereby reducing the overall time loss despite using multiple packets.
Solution Approach 2:
The patent replaces complex mechanical alignment processes with a more efficient method using reference taps and digital signal processing. Instead of time-consuming manual or iterative alignment procedures, the system uses automated reference-based alignment, which significantly reduces the time required to process multiple packets while maintaining high measurement precision.
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
This approach enables precise identification and tracking of target objects by aligning CIR reports, enhancing the accuracy of radio frequency sensing in wireless communication systems.
Implementation Method 1
estimating, from the signal, a channel impulse response (CIR) that represents signal reflections from one or more objects as multiple taps
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a responding device may receive a signal from an initiating device. The responding device may estimate, from the signal, a channel impulse response (CIR) that represents signal reflections from one or more objects as multiple taps. The responding device may select one or more taps, from the multiple taps, that are within a first time window that starts at a first offset from a reference point and that has a first specified time duration. The responding device may transmit, to the initiating device, a CIR report that indicates the one or more taps. Numerous other aspects are described.