FM0 code decoding method and device

Abstract

The invention relates to the field of communication, and discloses an FM0 code decoding method and device. The method comprises the following steps: acquiring a bit window width between two adjacent maximum values in FM0 coded data; buffering data to be decoded corresponding to the bit window width in a data buffer, and buffering flag bit data corresponding to the bit window width in a flag buffer, wherein the bit window width, the data to be decoded and the flag bit data correspond one by one; synchronizing the buffered data to be decoded in order to confirm which two adjacent bits in the data to be decoded represent one code element; and reading the data to be decoded and the flag bit data from the data buffer and the flag buffer by two bits once in sequence, and performing error correction and decoding on the read data to be decoded according to the read flag bit data. Through adoption of the FM0 code decoding method and device, the FM0 code decoding reliability can be enhanced; the FM0 code decoding speed can be increased; and the receiving sensitivity is increased.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for decoding FMO codes. Background technique [0002] The full name of FM0 code is biphase interval code code, which is characterized by the use of level changes in a bit window to represent different logics. If the level is only flipped at the beginning of the bit window, and the other positions are not flipped, it means logic "1"; if the level flips both at the beginning of the bit window and in the middle of the bit window, it means logic "0". ". According to the FM0 encoding rule, it can be found that no matter whether the transmitted symbol is "0" or "1", flipping needs to occur at the beginning of the bit window. [0003] The traditional way to decode the FM0 code is to capture each edge (including rising and falling edges) through a comparator, and then decode it, such as figure 1 shown. The implementation method of this decoding is simple, but the...

AI Technical Summary

Problems solved by technology

If the edge of the interference signal is also collected during decoding, it will cause errors in the entire decoding beat, resulting in complete errors in subsequent decoding

This leads to the fact that in practical applications, the decoder cannot work normally in a relatively harsh electromagnetic environment.

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