Wireless Frequency Synchronization via Master-Slave Tables
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining communication quality due to noise interference, particularly when using fixed operating frequencies, and the frequency hopping mechanism is limited by the need for frequent frequency switching and reliable information transmission.
Innovation Solution
A communication system where a master device periodically sends synchronous messages to slave devices at intervals, allowing them to synchronously switch operating frequencies according to a frequency table, ensuring effective synchronization even in unsatisfactory communication conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping mechanism is adopted to enhance anti-noise capability, then communication reliability is improved, but device complexity increases due to frequent frequency switching and information transmission requirements
Solution Approach 1:
The master device pre-generates and stores frequency tables containing sequences of operating frequencies before communication begins. These pre-prepared frequency tables are then distributed to slave devices, eliminating the need for each device to independently calculate and switch frequencies in real-time, thus reducing the complexity of frequency management while maintaining reliable frequency hopping for noise avoidance
Solution Approach 2:
The master device acts as an intermediary that centralizes the frequency hopping control function. It generates frequency tables, manages frequency switching timing, and distributes this control information to all slave devices. This intermediary approach consolidates the complexity in one device while allowing slave devices to operate with simpler logic, reducing overall system complexity while maintaining reliability
2Reliability
If operating frequency is switched frequently to avoid noise interference, then communication quality is improved, but loss of time increases due to frequent synchronization messages
Solution Approach 1:
The system implements periodic frequency switching based on pre-defined frequency tables with predetermined time intervals. The master device sends synchronous messages at regular periodic intervals rather than continuously, allowing devices to switch frequencies in synchronized periodic cycles. This periodic approach ensures communication quality by avoiding noise through frequency diversity while minimizing time loss by establishing predictable, rhythmic synchronization rather than continuous communication overhead
3Reliability
If frequency hopping information is transmitted frequently to maintain synchronization, then frequency coordination is improved, but loss of information increases when communication quality is unsatisfactory
Solution Approach 1:
Frequency tables containing complete frequency hopping sequences are pre-generated and stored in the master device before communication begins. These comprehensive frequency tables are transmitted to slave devices in advance or periodically updated, ensuring that all devices have the necessary frequency coordination information readily available without requiring frequent real-time transmissions, thus reducing information loss when communication conditions are poor
Solution Approach 2:
Slave devices are designed to autonomously store and utilize received frequency tables for their own frequency switching operations. Once a slave device receives a frequency table from the master device, it independently manages its frequency hopping according to the stored information without needing continuous verification or updates from the master device. This self-service capability ensures that frequency synchronization is maintained even when communication quality deteriorates, as devices rely on their locally stored frequency information
Data Source
AI summary
A communication system, a master device, and a communication method are provided. The communication system includes a master device and at least one slave device. The master device periodically sends a plurality of synchronous messages at intervals of a first predetermined time. The at least one slave device respectively receives the corresponding synchronous messages via wireless communication. The master device and the at least one slave device synchronously switch an operating frequency of wireless communication according to a frequency table.