Wireless Preamble Encoding for Industrial Data Reliability
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Solution Overview
Problem
Conventional wireless network technologies, such as Bluetooth or IEEE 802.15.4, face challenges in providing high data transmission reliability with low latency in industrial environments due to high data packet loss rates caused by multipath signal propagation and electromagnetic noise, especially in machine control networks.
Innovation Solution
A method and device for wireless data packet transmission in control networks that switch between two operating modes: one using individual signal pulses for preamble encoding and another using repeated signal pulses to enhance signal recognition, reducing data packet loss by improving preamble recognition performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wireless network technologies (Bluetooth, IEEE 802.15.4) are used for machine control, then device complexity is reduced and ease of operation is maintained, but data transmission reliability deteriorates due to high data packet loss rates in industrial environments
Solution Approach 1:
The patent changes the waveform parameters by introducing a RAKE receiver that processes multiple signal paths with different time delays. The system divides the received signal into multiple paths and correlates each path with the known preamble sequence, accumulating energy from multipath components rather than treating them as interference. This parameter change in signal processing approach transforms the system's ability to handle industrial electromagnetic environments.
2Measurement precision
If conventional preamble detection methods are used, then device complexity is kept low, but measurement precision deteriorates due to incorrect preamble recognition in noisy industrial environments
Solution Approach 1:
The RAKE receiver implements feedback through correlation processing, where the received signal is continuously compared with the known preamble sequence. The correlation output provides feedback about signal quality and timing, allowing the receiver to accurately identify the preamble even in noisy conditions. This feedback mechanism enables precise measurement of signal arrival and improves preamble recognition accuracy.
Solution Approach 2:
The patent replaces simple energy detection methods with correlation-based detection. Instead of merely measuring signal energy thresholds, the system uses correlation processing to match the received signal with the expected preamble sequence. This substitution of detection mechanism dramatically improves measurement precision for preamble recognition in industrial environments with electromagnetic noise.
3Reliability
If simple energy detection receivers are used, then device complexity is reduced, but reliability deteriorates due to high data packet loss from incorrectly recognized preambles
Solution Approach 1:
The patent replaces energy detection receivers with correlation receivers. The correlation receiver compares the received signal with the known preamble sequence, providing robust detection even when signal energy is low or distorted by multipath effects. This substitution fundamentally improves reliability by making detection based on signal structure rather than simple energy thresholds, overcoming the limitations of energy detection in industrial environments.
Data Source
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AI summary
Method for wire-free transmission of data packets between network nodes in a control network, wherein the data packets each have a preamble for synchronization, which preamble consists of a predetermined number of preamble symbols; wherein, in a first operating mode (figure 5a), each preamble-subsymbol (Cj, Cj+1) of a preamble symbol in the preamble is coded by the phase angle of a transmitted single signal pulse; wherein, in a second operating mode (figure 5b), in order to increase the signal recognition performance, for the preamble which is transmitted in the data packet, a signal pulse sequence (SIF) for coding the preamble-subsymbol (Cj, Cj+1) is transmitted instead of a single signal pulse, in which signal pulse sequence (SIF) the single signal pulse is transmitted repeatedly.