Vehicle Radio Transmission Channel Change Detection With Phase-Stable I/Q Data

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Solution Overview

Problem

Existing methods for detecting changes in a vehicle's transmission channel system are hindered by technical tolerances and inaccuracies, leading to false or undetected changes due to high dynamic components in in-phase and quadrature-phase data, making it difficult to accurately identify real changes in the channel.

Innovation Solution

A method involving the transmission of broadband signals, determination of phase-stable in-phase and quadrature-phase data, and rotation of channel pulse responses by a defined phase angle to stabilize the data, allowing for accurate detection of changes in the transmission channel system.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If frequency deviation compensation is performed for each individual frame using I&Q demodulation, then phase stability within each frame is improved, but phase stability between multiple frames deteriorates due to different reference adjustments

Engineering Contradiction:

Improvephase stabilityVSAvoiddetection accuracy

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent applies preliminary action by determining a common reference phase angle from multiple channel pulse responses before performing rotation. This reference phase angle is determined in advance and used consistently across all frames, eliminating the need for different reference adjustments per frame and ensuring phase stability between frames.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent merges multiple channel pulse responses to determine a common reference phase angle that represents the average phase characteristics across all frames. This combined reference is then used for rotating all channel pulse responses, creating unified phase stability across the entire dataset rather than treating each frame independently.

Inventive Principle:

Principle #5Merging (Combining)

2Device complexity

If technical tolerances and inaccuracies in transmitter and receiver components are present, then device complexity is reduced, but measurement precision deteriorates due to apparent changes in transmission channel

Engineering Contradiction:

Improvesystem simplicityVSAvoidchannel change detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent converts the harmful effect of technical tolerances and apparent channel changes into a beneficial process by using rotation based on a common reference phase angle. This rotation aligns all channel pulse responses to a consistent reference, causing the apparent changes due to tolerances to cancel out while preserving real physical changes in the transmission channel.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent introduces a common reference phase angle as an intermediary that mediates between the transmitter and receiver measurements. This reference serves as a stable intermediate reference frame that eliminates the direct impact of component tolerances and frequency deviations on the measurement accuracy.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If phase rotation is applied to stabilize in-phase and quadrature-phase data, then detection reliability is improved, but device complexity increases due to additional processing steps

Engineering Contradiction:

Improvedetection reliabilityVSAvoidsignal processing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by rotating the channel pulse responses in the complex plane based on phase angles. This transformation changes the phase parameter of the signal while preserving its magnitude and information content, stabilizing the in-phase and quadrature-phase data without requiring complex hardware modifications.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12452105B2Method for detecting a change in a communications channel system of a vehicle, RF module, radio system and vehicle with radio system

Publication Date: 2025.10.21 HELLA GMBH & CO KGAA

AI summary

A method for detecting a change in a transmission channel system of a vehicle. The method includes: transmitting a broadband transmission signal; receiving a signal; determining in-phase data and quadrature-phase data of a channel pulse response of the transmission channel system; determining a respective actual phase angle of the plurality of channel pulse responses at a characteristic location; determining a respective phase rotation angle of the plurality of channel pulse responses; rotating the plurality of channel pulse responses in a limited viewing area of a delay time direction; and detecting the change in the transmission channel system based on a change in the in-phase data and/or the quadrature-phase data.