Canceling Adjacent Channel Interference in V2X Waveforms
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Solution Overview
Problem
Existing solutions for reducing adjacent channel interference in vehicular communication systems, such as increasing energy levels of wireless messages, are inadequate as they still result in lost messages due to intense interference, particularly in Dedicated Short Range Communication (DSRC) systems used for Advanced Driver Assistance Systems (ADAS) and autonomous driving.
Innovation Solution
An interference management system that employs software installed in onboard vehicle computers to monitor and cancel out adjacent channel interference waveforms, allowing DSRC messages to be transmitted and received simultaneously across multiple channels without increasing energy levels, thereby eliminating interference and enabling full-duplex communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the energy level of wireless messages is increased to overcome adjacent channel interference, then the messages can be heard by recipients through interference, but the interference problem persists and some messages are still lost due to intense adjacent channel interference
Solution Approach 1:
The system captures the harmful adjacent channel interference waveform and uses it as a reference signal to generate an inverse waveform. This inverse waveform is then subtracted from the received signal to cancel out the interference, converting the harmful interference into a useful reference for elimination.
Solution Approach 2:
The patent introduces an interference management system as an intermediary component between the transmitter and receiver. This system includes an interference waveform generator and canceller that processes signals to remove interference before delivery, acting as a mediator that resolves the conflict between transmission and reception on adjacent channels.
2Productivity
If a single channel is used for both transmission and reception in full-duplex communication, then simultaneous send and receive is enabled, but adjacent channel interference occurs when transmitting on one channel and receiving on adjacent channels
Solution Approach 1:
The system captures the harmful adjacent channel interference waveform and uses it as a reference signal to generate an inverse waveform. This inverse waveform is then subtracted from the received signal to cancel out the interference, converting the harmful interference into a useful reference for elimination.
Solution Approach 2:
The interference management system performs preliminary anti-action by generating an inverse interference waveform before the actual reception occurs. This inverse waveform is prepared in advance and applied to cancel out the expected interference, preventing it from affecting the received signal.
Data Source
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AI summary
The disclosure describes embodiments for reducing adjacent channel interference for wireless vehicular messages. In some embodiments, a method includes monitoring, by an onboard vehicle computer, a channel of a Vehicle-to-Everything (V2X) radio for a V2X message. The method incudes determining waveform data describing a waveform that is measured on the channel by the onboard vehicle computer when monitoring the channel. The method includes determining interference data which describes an adjacent channel interference waveform which is measured on the channel by the onboard vehicle computer when monitoring the channel. The waveform includes the adjacent channel interference waveform. The method includes canceling out the adjacent channel interference waveform described by the interference data from the waveform described by the waveform data to generate digital data describing a version of the V2X message that substantially does not include the adjacent channel interference waveform, thereby reducing the adjacent channel interference for the V2X message.