Differential Manchester decoding circuit and method

Abstract

The invention belongs to the technical field of wireless communications and provides a differential Manchester decoding circuit and method. The circuit comprises: a waveform conversion unit for sampling a received square wave signal to obtain a high level or a low level and performing computing operations of different types on a sampling counter to convert the square wave signal into a triangular wave signal; a signal judgment unit for judging the high and low levels of the triangular wave signal by use of a preset high level threshold and a preset low level threshold, respectively, and recovering decoding clock and intermediate data by judging the wave crests and the wave troughs of the triangular wave signal; and a data decoding unit for performing twice sampling on the intermediate data with the decoding click and performing EXCLUSIVE OR processing on the sampled data to obtain decoded data. The differential Manchester decoding circuit is capable of eliminating the influence of clock skew by virtue of self-addition and self-subtraction of the sampling counter, and is simple in circuit structure and low in error code occurrence rate.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a differential Manchester decoding circuit and method. Background technique [0002] Manchester Encoding (Manchester Encoding, ME), also known as phase encoding, is a synchronous clock encoding technology commonly used in LAN transmission. Manchester coding is a coding method for synchronous transmission of data. There is a jump in the middle of each bit, jumping from low to high means 0, and jumping from high to low means 1; it can also be defined in the opposite way, jumping from low to high Change means 1, jumping from high to low means 0, and differential Manchester encoding has further improvement on the basis of Manchester encoding. In the code stream, the same direction as the previous jump is data 0, and the reverse is data 1. Such as figure 1 As shown, therefore, it is necessary to distinguish the long level and the short level in the receive...

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Problems solved by technology

[0004] The embodiment of the present invention provides a differential Manchester decoding circuit and method, aiming to solve the existing need for a more accurate sampling clock for counting, so as to judge the length of the jump edge and recover the clock, but in the actual circuit system , an accurate sampling clock may be difficult to achieve, leading to problems with higher bit error rates

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