Research on frame synchronization technology of terminal asynchronous serial communication

This paper studies and designs a method of frame synchronization sequence detection using "0x7D86" as asynchronous serial communication. The method combines the high level of L symbols of frame interval as the symbol of frame synchronization. It is a frame synchronization protocol combining time interval and byte filling. The probability of false detection and missing detection of frame synchronization sequence under random error or burst interference and clock mismatch, and the relationship between error probability, number of high level interval and false alarm probability and missing alarm probability are studied. In the case of high bit error probability, fuzzy matching method is added to reduce the missing alarm probability. The results show that the detection method can greatly reduce the false alarm probability and missing alarm probability, and improve the stability and performance of asynchronous serial communication between terminal devices.