Motor Vehicle Communication Device Orthogonal Polarization Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The coexistence of telematics systems and toll collection systems in motor vehicles is hindered by signal disturbances due to overlapping frequency ranges, leading to unreliable communication between motor vehicles and toll stations, particularly when the telematics system's transmission signal interferes with the toll collection system's signal reception.
Innovation Solution
A communication device in motor vehicles that reduces transmission power based on the reception of orthogonally polarized electromagnetic waves, allowing it to detect the presence of a toll station and adjust transmission power to avoid interference, thereby ensuring undisturbed communication between the toll station and the ETC-OBU without requiring position data of the toll stations or vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the telematics system transmits a transmission signal with high power to ensure communication reliability, then the communication connection between motor vehicles is improved, but the toll collection system's signal reception is disturbed
Solution Approach 1:
The communication device dynamically adjusts its transmission power based on real-time detection of toll station signals. The device switches between high power transmission (for general communication) and low power transmission (when toll station signal is detected), making the transmission power adaptive rather than static to resolve the contradiction between communication reliability and interference prevention
Solution Approach 2:
The communication device uses feedback from detecting the toll station's orthogonally polarized signal to control its own transmission power. The detection result feeds back to the control unit, which then adjusts the transmission power accordingly, creating a closed-loop control system that prevents interference while maintaining communication functionality
2Object-affected harmful factors
If the telematics system deactivates in the area of a toll station to avoid interference, then the toll collection system operates undisturbed, but the communication functionality is lost
Solution Approach 1:
The communication device segments its operation into different transmission power modes: high power mode for normal communication and low power mode for areas where toll stations are detected. This segmentation allows the system to maintain communication functionality in most areas while preventing interference only when necessary, rather than completely deactivating
Solution Approach 2:
The transmission power is adjusted locally based on the specific situation detected by the communication device. Instead of a global deactivation, the system applies low power transmission only in the local area where a toll station signal is detected, while maintaining high power transmission in other areas, thus preserving communication functionality where it is needed
3Object-affected harmful factors
If position data of toll stations is used to control transmission power, then the interference prevention is improved, but the device complexity increases
Solution Approach 1:
The communication device performs self-detection of the toll station signal using its own reception unit, eliminating the need for external position data databases or complex processing systems. The device serves itself by using its reception capabilities to automatically trigger appropriate transmission power levels without requiring additional data sources
Solution Approach 2:
The orthogonally polarized signal from the toll station acts as an intermediary that carries information about the presence of a toll station. Instead of requiring the device to process complex position data, the polarized signal serves as a direct mediator that triggers the appropriate transmission power adjustment through simple detection and feedback mechanisms
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables reliable communication between motor vehicles and toll stations by reducing transmission power when a toll station is detected, preventing signal interference and ensuring the function of the toll collection system is maintained without the need for position data, thus improving the coexistence of CV2X and ETC systems.
Implementation Method 1
a communication device (32, 34) for arrangement in a motor vehicle (14, 16, 18), wherein the communication device (32, 34) is formed to communicate at least with at least one other motor vehicle or at least one stationary receiver, for which purpose a wireless communication connection based on linearly polarized electromagnetic waves is used
Implementation Method 2
reduces transmission power depending on the reception of a reception signal, which uses, with respect to the linearly polarized electromagnetic waves, electromagnetic waves at least partially orthogonally polarized hereto
Data Source
AI summary
The present disclosure relates to a method for operating a communication device of a motor vehicle. The communication device communicates with at least one other motor vehicle or at least one stationary receiver, wherein for this purpose, a wireless communication connection based on linearly polarized electromagnetic waves is used. In order to use the communication connection, a transmission signal is transmitted with a specified transmission power by the communication device, and the transmission power is reduced on the basis of the reception of a reception signal by means of the communication device, said reception signal using electromagnetic waves which are at least partly orthogonally polarized relative to the linearly polarized electromagnetic waves.