Power Line Communication Sync Using Preamble Frequency and Duty
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Solution Overview
Problem
Mobile devices using power line communication face issues with data transmission stability due to noise and require additional circuitry like PLL for synchronization, leading to potential data degradation or failure.
Innovation Solution
Mobile devices equipped with a power line communication module, frequency/duty detector, and control circuit to detect and utilize the frequency and duty of preamble signals for stable data transmission without separate clock lines or additional circuitry like PLL.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power line communication is used for data transmission, then communication capability is provided, but data transmission stability deteriorates due to noise
Solution Approach 1:
The patent applies preliminary action by detecting the frequency and duty cycle of the preamble signal before actual data transmission. The receiver performs frequency/duty detection during the preamble interval, then uses these detected parameters to configure the data reception process, thereby preparing the system in advance to handle noise conditions and improve transmission stability.
2Reliability
If PLL and additional circuitry are used for synchronization, then data transmission stability is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the need for complex PLL circuitry by using a simpler frequency/duty detection mechanism. Instead of implementing a full phase-locked loop system, the invention extracts only the essential frequency and duty cycle information from the preamble signal, achieving synchronization with significantly reduced circuit complexity.
Solution Approach 2:
The system performs self-service by using the preamble signal itself to provide the frequency and duty cycle information needed for synchronization. The receiver detects these parameters directly from the transmitted preamble without requiring external reference signals or complex locking mechanisms, making the system self-sufficient and simpler.
3Reliability
If separate connection terminals are used for power and data, then communication reliability is improved, but device size increases
Solution Approach 1:
The patent merges power and data communication functions into a single power line interface. By modulating data onto the power line signal and using frequency/duty detection to extract this information, the system combines what would traditionally require separate terminals into one unified connection, reducing device size while maintaining communication reliability.
Data Source
AI summary
A mobile device includes; a power line communication ( ) module that communicates data with an external device via a power line, receives a first preamble signal from the external device during a first preamble interval, receives a voltage signal as the data during a data reception interval following the first preamble interval, and demodulates the voltage signal to provide a demodulated voltage signal, a frequency/duty detector that detects a frequency and a duty of the first preamble signal, and a control circuit that performs signal a data determination operation on a demodulated voltage signal during a data period and using the first detected frequency and the first detected duty.