A decoding method and device for fm0 encoding

Abstract

This application discloses a decoding method and device for FMO encoding. The method comprises: obtaining a digital signal of a detected square wave in a bit window; constructing multiple bit windows for bits to be decoded in the digital signal; dividing each bit window into a plurality of bit window units, and determining each bit window Counting vector L and counting vector H of counting vector L and counting vector H; Determine multiple bit window level vectors corresponding to each bit window level change according to the coding rule of FM0; According to counting vector L and counting vector H of each bit window and each bit window Level vector, calculate the multiple similarities corresponding to each bit window; determine the target bit window level vector according to the multiple similarities corresponding to each bit window; determine the bit decoding to be decoded according to the target bit window level vector whether succeed. It solves the problem that under the condition of low signal-to-noise ratio, the signal after detection in the currently decoded bit window will be distorted to a certain extent due to the influence of noise, resulting in decoding failure.

Description

technical field [0001] The present application relates to the field of decoding digital signals in wireless digital communication, in particular, to a method and device for decoding FMO codes. Background technique [0002] The full name of FM0 encoding is biphase interval encoding. The encoding rule is that all high or all low levels in the bit window represent logic "1", and if the level flip occurs within the bit window, it represents logic "0". At the same time It is required that the level at the beginning of any bit window must be flipped. Because the FM0 encoding rule is symmetrical and simple, and the encoding and decoding process is easy to realize through hardware circuits, it is widely used in 5.8G radio frequency communication such as radio frequency identification (Radio Frequency Identification, referred to as FRID) and electronic non-stop charging. [0003] The current FM0 decoding algorithm usually uses the correlation algorithm of a single symbol in the bit ...

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Problems solved by technology

[0005] The main purpose of this application is to provide a decoding method and device for FMO coding, to solve the problem of low signal-to-noise ratio in the related art. A certain degree of distortion causes the problem of decoding failure

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