UWB Signal Reception Time Estimation for Accurate Ranging
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Solution Overview
Problem
Existing technologies for determining the distance between devices using ultra-wideband signals lack accuracy in measuring distances and angles.
Innovation Solution
A communication device and method that utilizes a wireless communication section to receive signals, correlate them at designated intervals, convert data matrices into expanded modal and signal matrices, and estimate reception times using iterative calculations with a regularization parameter, adjusting its value based on reception status to improve measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional correlation methods are used to determine signal reception time, then the measurement process is simple, but the distance measurement accuracy is insufficient
Solution Approach 1:
The patent segments the signal processing into multiple stages: initial correlation computation, matrix expansion, iterative refinement with regularization parameters, and multi-stage calculation. This segmentation allows the system to achieve high measurement precision by breaking down the complex estimation process into manageable steps, each optimizing specific aspects of the signal analysis.
Solution Approach 2:
The patent transforms the problem from simple time-domain correlation to a multi-dimensional matrix optimization problem. By expanding the correlation results into matrices and applying iterative calculations with regularization parameters, the system operates in an expanded mathematical space that enables more precise distance measurement through dimensional analysis and optimization.
2Measurement precision
If simple correlation computation is used, then the processing speed is fast, but the reception time estimation accuracy is insufficient
Solution Approach 1:
The patent performs preliminary correlation computation to obtain initial results, then uses these results as input for subsequent matrix expansion and iterative refinement. This preliminary action provides a starting point that guides the more computationally intensive iterative calculations, reducing the overall computation time while maintaining high accuracy in reception time estimation.
Solution Approach 2:
The patent implements continuous iterative calculation with regularization parameters that refine the reception time estimation progressively. Instead of a single computation step, the system continuously improves the estimation through multiple iterations, maintaining useful computational action throughout the process to achieve both accuracy and efficiency.
3Adaptability or versatility
If fixed regularization parameter is used in iterative calculation, then the calculation process is simple, but the adaptation to different reception conditions is poor
Solution Approach 1:
The patent makes the regularization parameter dynamic by adjusting it based on reception status during the iterative calculation process. Instead of using a fixed parameter, the system adapts the regularization parameter to match different signal conditions, improving the system's versatility and adaptability to various reception scenarios while managing complexity through structured parameter control.
Data Source
AI summary
A communication device comprising: a wireless communication section configured to wirelessly receive a signal from another communication device; and a control section configured to estimate a reception time of the second signal based on the expanded signal matrix that minimizes the predetermined norm, wherein the control section executes the iterative calculation separately at a plurality of stages, sets a value of the regularization parameter used for the iterative calculation at or after a second stage of the plurality of stages to a value of the regularization parameter or more used for the iterative calculation at a previous stage, and changes the value of the regularization parameter based on a reception status of the second signal during the iterative calculation at or after the second stage.