Wireless Ranging Feedback Using Subcarrier CSI Compression
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Solution Overview
Problem
Existing wireless communication technologies face challenges in implementing reliable ranging due to limitations in feedback mechanisms for channel state information, particularly in scenarios like passive entry passive start (PEPS) systems, where accurate positioning and measurement are crucial.
Innovation Solution
A ranging method and apparatus that employs flexible feedback mechanisms for channel state information, allowing for various feedback manners such as interpolation, grouping, and calibration to enhance measurement reliability and accuracy, utilizing OFDM symbols and feedback methods like linear or cubic spline interpolation, and subcarrier grouping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel state information of all valid subcarriers is fed back, then measurement accuracy is improved, but feedback data amount increases
Solution Approach 1:
The patent segments the feedback process into multiple feedback manners (first feedback manner, second feedback manner, third feedback manner) that provide different levels of detail. The first feedback manner provides detailed CSI of all valid subcarriers for high accuracy, while the second and third feedback manners provide summarized or representative CSI for reduced data amount, allowing the system to select appropriate granularity based on requirements.
Solution Approach 2:
The patent changes the parameter of feedback detail level by introducing multiple feedback manners with different aggregation levels. The system can dynamically adjust the feedback parameter from detailed subcarrier-level CSI to grouped or representative CSI, thereby balancing measurement accuracy against feedback data amount according to specific scenario requirements.
2Device complexity
If a single fixed feedback manner is used, then system complexity is reduced, but ranging reliability and flexibility are limited
Solution Approach 1:
The patent introduces dynamic adaptability by defining multiple feedback manners that can be selected based on different scenarios. The system transitions from a static single feedback manner to a dynamic multi-manner system where the appropriate feedback mode can be chosen according to channel conditions, ranging requirements, and data budget constraints, thereby improving ranging reliability without excessive complexity.
Solution Approach 2:
The patent creates a universal feedback framework that encompasses multiple feedback manners within a single system. This multi-functional feedback mechanism can adapt to different ranging scenarios, channel conditions, and accuracy requirements, making the system universally applicable while maintaining manageable complexity through standardized procedures.
3Reliability
If signal measurement is performed by using a symbol as a granularity, then ranging reliability is improved, but processing complexity increases
Solution Approach 1:
The patent segments the ranging measurement process into symbol-level operations, where each symbol in the ranging frame is measured independently to obtain channel state information. This segmentation enables more reliable measurements by capturing channel variations at the symbol level, while the standardized measurement procedure keeps processing complexity manageable.
Data Source
AI summary
A ranging method, apparatus, and system are disclosed, to implement reliable ranging. A first node measures a first ranging frame to obtain first measurement information, and the first node sends second measurement information based on the first measurement information and a first feedback manner. In other words, a form in which the first node feeds back measurement information needs to be determined based on a measurement result of the first node and the first feedback manner.