UWB Ranging Direct-Path Detection Through Cipher Correlation
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Solution Overview
Problem
Existing UWB communication systems lack effective methods to accurately identify the direct path of data packets between a transmitter and a receiver, particularly in the presence of noise and malicious attacks, which can lead to inaccurate time-of-arrival calculations.
Innovation Solution
A method for UWB communication systems that involves generating and comparing cipher sequences at the transmitter and receiver, analyzing correlations in received data, and applying criteria to identify a first correlation peak in accumulator data to determine the direct path, using threshold values and diagnostic checks to ensure accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correlation analysis is performed on received UWB signals to identify direct path, then time-of-arrival calculation accuracy is improved, but the system becomes vulnerable to noise and malicious attacks that create false correlation peaks
Solution Approach 1:
The patent applies preliminary action by performing diagnostic checks and applying acceptance criteria to correlation peaks before accepting them for time-of-arrival calculation. The system evaluates multiple criteria (amplitude threshold, signal-to-noise ratio, consistency across multiple packets) in advance to verify that a detected peak represents the true direct path, thereby preventing noise and malicious interference from corrupting the measurement.
Solution Approach 2:
The patent implements feedback mechanisms by continuously monitoring correlation peak characteristics and comparing them against dynamically updated thresholds and criteria. The system uses historical data from multiple packets to refine its understanding of legitimate signal patterns versus interference, adjusting acceptance criteria based on observed signal characteristics and environmental conditions.
2Reliability
If multiple acceptance criteria are applied to verify correlation peaks, then reliability of direct path identification is improved, but device complexity increases due to additional processing steps
Solution Approach 1:
The patent applies segmentation by dividing the verification process into distinct, modular criteria checks: amplitude threshold evaluation, signal-to-noise ratio calculation, consistency verification across packets, and temporal plausibility checks. Each criterion operates as an independent decision point, allowing the system to systematically evaluate multiple aspects of signal validity without creating a monolithic complex process.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting threshold values and acceptance criteria based on signal characteristics, environmental conditions, and historical performance data. The system adapts parameters such as amplitude thresholds, correlation window sizes, and minimum packet counts required for verification, optimizing the balance between reliability and processing complexity for different operational scenarios.
Data Source
AI summary
A method for use in a wireless communication system comprising a transmitter and a receiver, the method comprising receiving, in the receiver, data comprising a plurality of channel-distorted synchronization codes and plurality of channel-distorted cipher codes, generating a receiver cipher sequence, the receiver cipher sequence comprising a plurality of receiver cipher codes, analyzing the received data to identify correlations between the plurality of channel-distorted cipher codes in the received data and the plurality of receiver cipher codes, accumulating the identified correlations as accumulator data in an accumulator, identifying one or more peaks in the accumulator data, identifying a first correlation peak in the accumulator data that meets one or more criteria and using the first correlation peak to identify the first path of a data packet from the transmitter.