Pulse Shaping Device for Wideband CAN Communication
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Solution Overview
Problem
Existing CAN bus systems face challenges in achieving higher data rates beyond CAN-FD without requiring complex and costly software adaptations, especially in mixed networks with existing CAN user stations.
Innovation Solution
A user station equipped with a pulse shaping device to include a training sequence for determining channel characteristics and a correction device for signal correction, allowing for refined CAN signal structures and communication formats that enable higher data rates without additional systems, ensuring compatibility with existing CAN principles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If higher data rates beyond CAN-FD are implemented, then communication speed is improved, but device complexity increases due to software adaptation requirements
Solution Approach 1:
The patent changes physical layer parameters by introducing pulse shaping filters and training sequences in the signal transmission process. This allows achieving higher data rates (5-100 Mbit/s) through parameter optimization rather than software adaptation, resolving the contradiction between speed improvement and device complexity
Solution Approach 2:
The patent implements preliminary channel characteristic determination through training sequences before actual data transmission. This preliminary action enables the system to adapt to channel conditions and achieve higher data rates without requiring complex real-time software adaptation during operation
2Speed
If software adaptation is implemented for higher speeds, then data rate is improved, but cost increases due to complex software adaptation
Solution Approach 1:
The patent achieves higher data rates through parameter changes in the physical layer (pulse shaping, training sequences) rather than software adaptation. This approach reduces manufacturing costs by avoiding complex software development and validation processes while still achieving 5-100 Mbit/s data rates
3Adaptability or versatility
If mixed networks with existing CAN stations are maintained, then adaptability is improved, but signal integrity deteriorates at higher speeds
Solution Approach 1:
The patent applies local quality by introducing pulse shaping filters and training sequences specifically in the data portion of CAN-FD frames while maintaining the standard CAN protocol structure for arbitration and header sections. This allows higher speeds in the data segment while preserving compatibility with existing CAN stations for arbitration and control functions
Solution Approach 2:
The training sequence acts as an intermediary element that enables reliable high-speed communication in mixed networks. It provides channel characterization information that helps maintain signal integrity at higher data rates without requiring existing CAN stations to be aware of or participate in the enhanced protocol
Data Source
AI summary
A user station for a bus system and a method for broadband CAN communication are provided, in which the user station includes a pulse shaping device for shaping the pulse of a message so that the message includes a training sequence which includes pieces of information for determining the channel characteristic between the user station and a further user station of the bus system to which the message is to be transmitted, and/or a correction device for correcting a signal received by the user station based on a training sequence, which is included in a message shaped by a pulse shaping device of the further user station.