Vehicle V2V Communication Pad Data Insertion for Multi-Path Interference
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Solution Overview
Problem
Conventional V2V communication systems experience performance degradation at short distances, particularly around 100 m, due to interference from signals reflected off road surfaces, leading to increased packet error rates and instability in communication for safety and autonomous driving.
Innovation Solution
The proposed solution involves a vehicle control method that uses pad data based on GNSS to improve communication performance by inserting pad data into data frames when the distance between vehicles falls within a predetermined range, effectively blocking noise signals and optimizing data frame utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional V2V communication is used to secure communication performance at 300m distance, then long-distance communication is improved, but short-distance communication performance deteriorates due to multi-path interference
Solution Approach 1:
The patent applies different communication strategies based on distance conditions. When the distance between vehicles is determined to be in the short-distance range (approximately 100m), the system activates specific interference mitigation techniques including adjusting transmission parameters and applying signal processing methods to counteract multi-path effects, while using conventional methods for long-distance communication
Solution Approach 2:
The system dynamically changes communication parameters such as transmission power, modulation scheme, and coding rate based on the detected distance between vehicles. When short-distance communication is detected, parameters are adjusted to optimize performance in multi-path environments, thereby resolving the contradiction between long-distance reliability and short-distance interference
2Ease of operation
If data frames with fixed structure are used for communication scheduling, then communication organization is simplified, but noise from other data signals causes interference
Solution Approach 1:
The patent introduces a preamble sequence before each data frame that contains synchronization information and signaling about the upcoming data frame structure. This preliminary action allows receiving vehicles to prepare for incoming data, identify the start position accurately, and distinguish between different data frames, thereby preventing interference while maintaining fixed structure benefits
Solution Approach 2:
The system uses a dedicated synchronization sequence and signaling field as an intermediary between the fixed data frame structure and the variable communication conditions. This intermediary provides timing information and frame identification that enables proper synchronization without requiring variable frame structures, thus resolving the interference issue while preserving scheduling simplicity
Data Source
AI summary
A vehicle includes a communicator and a controller electrically connected to the communicator. The controller is configured to identify a distance between a vehicle and the other vehicle communicatively connected to the vehicle, insert a pad data into at least one data frame based on the identified distance, and transmit the at least one data frame into which the pad data is inserted to the other vehicle through the communicator.