CSI Sensing with Fixed AGC Gain for Stable Wireless Detection
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Solution Overview
Problem
Current wireless communication devices experience significant fluctuations in CSI due to varying AGC gains, leading to low precision in target sensing applications such as human body presence detection and posture recognition.
Innovation Solution
A method where a first node processes multiple sensing packets based on a fixed AGC gain during the sensing mode, stabilizing the CSI and improving its accuracy for target sensing. Additionally, the node updates the AGC gain periodically based on preset conditions to adapt to changing environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wireless communication device adjusts gains of various components in the receive path through the AGC component based on power of each sensing packet, then the signal power can be normalized, but the obtained CSI fluctuates greatly and precision is low
Solution Approach 1:
The patent segments the processing of sensing packets by separating sensing mode from non-sensing mode. In sensing mode, a fixed AGC gain is applied to multiple sensing packets simultaneously, rather than adjusting gain for each individual packet. This segmentation allows the system to maintain consistent gain settings across multiple packets, reducing CSI fluctuations while still normalizing signal power.
Solution Approach 2:
The patent implements dynamic switching between two different AGC processing strategies: fixed gain mode for sensing operations and adaptive gain mode for normal communication. The system dynamically selects the appropriate processing mode based on the current operational context, allowing optimal performance for both sensing precision and communication reliability.
2Stability of the object's composition
If a fixed AGC gain is used for processing multiple sensing packets, then CSI stability is improved, but the system must switch between different processing modes for sensing and communication
Solution Approach 1:
The patent makes the AGC component multi-functional by enabling it to operate in two distinct modes: fixed gain mode for sensing applications and adaptive gain mode for normal communication. This universality allows a single AGC component to serve both sensing and communication functions optimally, rather than requiring separate dedicated components for each function.
Solution Approach 2:
The patent changes the operational parameter of the AGC component from always-adaptive to conditionally-fixed. By modifying the gain adjustment behavior based on operational mode (sensing vs. communication), the system achieves improved CSI stability without fundamentally redesigning the AGC architecture, thereby limiting the increase in device complexity.
3Adaptability or versatility
If the AGC gain is updated periodically based on preset conditions, then the system adapts to changing environments, but additional processing overhead is introduced
Solution Approach 1:
The patent implements periodic updates of the fixed AGC gain based on preset conditions such as elapsed time, number of processed packets, or environmental changes. Rather than continuously adjusting the gain, the system performs updates at periodic intervals, which reduces processing overhead while still maintaining adaptability to changing environments.
Solution Approach 2:
The patent incorporates feedback mechanisms where the system monitors preset conditions (time elapsed, packet count, environmental parameters) and uses this feedback to determine when to update the AGC gain. This feedback-driven approach ensures the system adapts to environmental changes only when necessary, minimizing unnecessary processing time while maintaining environmental adaptability.
Data Source
AI summary
Methods and nodes are provided, an example method including, when a first node is in a sensing mode, receiving, by the first node, at least one first signal frame from a second node. The example method further includes processing, by the first node, the at least one first signal frame based on a same automatic gain control (AGC) gain. The example method further includes obtaining, by the first node, channel state information (CSI) based on at least one processed first signal frame.