Orthogonal Polarization for Vehicle Wireless Communication Interference
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Solution Overview
Problem
Existing vehicle-to-vehicle communication systems face challenges in stabilizing communication quality due to interference between radio channels, particularly when multiple devices on the same moving body communicate simultaneously, leading to communication delays and instability.
Innovation Solution
A wireless communication system that employs multiple frequency channels with orthogonal polarization planes for signal transmission and reception, allowing for efficient channel resource management and reduced interference between channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carrier sensing is performed to avoid radio resource collision, then communication reliability is improved, but communication delay becomes unstable and communication speed decreases
Solution Approach 1:
The patent segments the communication system into multiple independent transceivers (first transceiver and second transceiver) that operate on different frequency channels. Each transceiver performs carrier sensing independently on its own channel, allowing simultaneous communication without mutual interference. This segmentation eliminates the need for one transceiver to wait for the other, thereby maintaining high reliability while reducing communication delay.
Solution Approach 2:
The patent introduces frequency channel diversity as an additional dimension for resource allocation. By using different frequency channels (first frequency channel and second frequency channel) for different transceivers, the system creates orthogonal communication paths that do not interfere with each other. This dimensional separation allows multiple communications to proceed simultaneously without carrier sensing conflicts, improving both reliability and reducing delay.
2Loss of time
If transmission power is reduced to suppress carrier sensing delay, then communication delay is reduced, but communication quality deteriorates due to external noise
Solution Approach 1:
The patent divides the communication system into multiple transceivers operating on separate frequency channels. Each transceiver can transmit at sufficient power levels on its dedicated channel without causing interference to others, eliminating the need to reduce transmission power. This segmentation allows maintaining high transmission power for reliable communication while avoiding carrier sensing delays.
Solution Approach 2:
The patent creates multiple copies of the communication function through different transceivers on different frequency channels. Each transceiver is a complete communication unit that can operate independently with full transmission power. This copying approach allows the system to maintain high power transmission for reliability while avoiding the delays associated with carrier sensing on shared channels.
3Reliability
If multiple frequency channels are used for communication, then communication reliability is improved, but channel interference occurs due to signal leakage between adjacent channels
Solution Approach 1:
The patent extracts and eliminates the interference problem by assigning different polarization planes to different frequency channels. The first transceiver uses one polarization plane while the second transceiver uses an orthogonal polarization plane. This extraction of the polarization dimension creates natural isolation between channels, removing the harmful interference effect of signal leakage while maintaining multiple frequency channels for high reliability.
Solution Approach 2:
The patent creates a composite communication system that combines frequency channel diversity with polarization diversity. By using both different frequency channels and different polarization planes, the system creates a multi-dimensional orthogonal separation that provides both frequency diversity for reliability and polarization isolation to prevent interference. This composite approach leverages multiple physical dimensions to simultaneously achieve high reliability and minimize channel interference.
4Productivity
If simultaneous communication is performed on the same radio resource, then communication efficiency is improved, but radio resource collision occurs leading to destabilization of communication quality
Solution Approach 1:
The patent segments the radio resource space into multiple independent frequency channels with different polarization planes. Each transceiver is assigned to a specific segment (frequency channel + polarization plane combination), allowing simultaneous communication without resource collision. This segmentation enables multiple communications to proceed in parallel while maintaining resource isolation, thereby achieving both high efficiency and high reliability.
Solution Approach 2:
The patent adds polarization plane as an additional dimension for resource separation beyond frequency channels. By utilizing both frequency and polarization dimensions, the system creates a four-dimensional resource space (two frequency channels × two polarization planes). This dimensional expansion allows more communications to occur simultaneously without interference, improving communication efficiency while maintaining quality through orthogonal separation.
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 approach stabilizes communication quality by minimizing interference and maintaining reliable communication even at short inter-vehicle distances, enhancing the reliability and speed of vehicle-to-vehicle communication.
Implementation Method 1
a polarization plane of a signal used in some of the frequency channels and a polarization plane of a signal used in the other frequency channels are orthogonal to each other
Data Source
AI summary
In a wireless communication device, which is mounted on a vehicle and performs wireless communication with a wireless communication device as a communication target using a plurality of frequency channels, the plurality of frequency channels includes a first channel and a second channel, and the first channel uses at least a radio signal of a polarization plane orthogonal to a polarization plane of a radio signal in the second channel.