V2X Interference Cancellation for Multi-Channel Reception

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Solution Overview

Problem

Existing V2X communication systems face interference issues such as adjacent channel interference, self-interference, and combination interference, which hinder the accurate reception of wireless data, particularly in multi-channel V2X networks, and existing solutions like increasing energy levels are inadequate.

Innovation Solution

An interference reduction system that uses cancellation sequences to eliminate or reduce adjacent channel interference, self-interference, and combination interference, allowing for clear reception of V2X messages without increasing energy levels, by determining the type of interference and applying specific cancellation techniques for each.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the energy level of V2X messages is increased to overcome interference, then the messages can be heard even with interference present, but this solution is inadequate and still results in some V2X messages not being heard due to intense adjacent-channel interference, intense self-interference, or combination thereof

Engineering Contradiction:

ImproveV2X message reception reliabilityVSAvoidenergy level of V2X messages

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies interference cancellation techniques that convert the harmful interference signals into beneficial information. By detecting and analyzing the interference patterns from adjacent channels and self-interference, the system generates cancellation sequences that subtract these interference components from the received signal, thereby transforming the harmful interference into a means for improving reception reliability without increasing transmission energy

Inventive Principle:

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

Solution Approach 2:

The patent changes the processing parameters of the received signal by applying interference cancellation sequences. The system dynamically adjusts the cancellation parameters based on detected interference characteristics, transforming the signal processing approach from simple energy-based reception to sophisticated interference-aware reception that maintains reliability without requiring higher energy levels

Inventive Principle:

Principle #35Parameter changes

2Productivity

If multiple V2X channels are used for communication, then more data can be transmitted and received, but adjacent channel interference, self-interference, and combination interference are created that impede V2X communications

Engineering Contradiction:

ImproveV2X communication throughputVSAvoidinterference (adjacent channel, self-interference, combination interference)

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and removes the harmful interference components from the received V2X signals. By identifying and separating the interference signals from adjacent channels and self-interference sources, the system applies cancellation sequences to extract and eliminate these harmful factors, allowing multiple channels to operate simultaneously without degrading communication quality

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces interference cancellation sequences as intermediary elements between the interference sources and the V2X message reception. These cancellation sequences act as mediators that neutralize the harmful effects of adjacent channel interference and self-interference, enabling high-productivity multi-channel communication by filtering out interference before it degrades the received messages

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If interference cancellation techniques are applied to eliminate adjacent channel interference, self-interference, and combination interference, then V2X messages can be clearly and accurately received without increasing energy levels, but system complexity increases

Engineering Contradiction:

ImproveV2X message reception accuracyVSAvoidinterference reduction system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary interference cancellation actions before the actual V2X message reception and processing. By pre-detecting interference patterns and generating cancellation sequences in advance, the system removes interference components before they can degrade the message reception, thereby achieving high accuracy without requiring complex real-time processing during critical message reception windows

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3621207B1Simultaneous reception of vehicle-to-everything (V2X) messages over multiple channels in multi-channel v2x networks

Publication Date: 2022.06.01 TOYOTA JIDOSHA KK

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AI summary

The disclosure describes embodiments for reducing interference for wireless vehicular messages. In some embodiments, a method includes detecting a presence of an interference signal on a channel of a Vehicle-to-Everything (V2X) radio which obscures payload data that is included in a V2X message received via the channel. The method includes determining a source of the interference signal present on the channel. The method includes canceling out the interference signal from the V2X message using a cancellation sequence selected based on the source to generate a modified version of the V2X message including the payload data which is substantially unobscured by the interference signal. The method includes providing the modified version of the V2X message to a vehicle component so that the vehicle component provides its functionality based on the payload data and not the interference signal.