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Manchester receiving decoding method and circuit based on bit delimitation

A decoding method and a decoding circuit technology, which are applied in the field of Manchester receiving and decoding methods and circuits, can solve problems such as data decoding errors, and achieve the effects of resisting the interference of decoding circuits and improving reliability and sensitivity.

Inactive Publication Date: 2019-02-12
广东中成卫星微电子发展有限公司
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  • Application Information

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Problems solved by technology

The conventional decoding method is to decode by the number of pulses in half a cycle. When multiple pulses are combined (smeared) in the demodulated data, data decoding errors will occur.

Method used

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  • Manchester receiving decoding method and circuit based on bit delimitation
  • Manchester receiving decoding method and circuit based on bit delimitation
  • Manchester receiving decoding method and circuit based on bit delimitation

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Embodiment Construction

[0028] The present invention will be further described through specific examples below, and the following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0029] Such as figure 1 Shown, a kind of Manchester receiving decoding method based on bit delimitation of the present invention comprises the following steps:

[0030] Step 1: Reshape the analog demodulated data; use 13.56Mhz clock signal for resampling, and count the high level of data, ignore the pulses less than two 13.56Mhz clock pulses, and filter out 73*N ns or less glitch signal.

[0031] Step 2: Carry out bit scanning for the received data 128*n / fc, n=1, 2, 3.....; the bit scanning circuit starts at a fixed time after the end of encoding and sending, if the last bit of data sent is "1" Then start after (84 / fc+128*9); if the last bit of data sent is "0", then start after (20 / fc+128*9); fc is a 13.56Mhz clock.

[0032] Step 3: Compare the inte...

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Abstract

The invention discloses a Manchester receiving decoding method and circuit based on bit delimitation. The method comprises the steps of shaping analog demodulated data; carrying out bit scan 128*n / fc,wherein the n is equal to 1, 2, 3 and the like; comparing integral levels in a first half bit (0-64 / fc) and a second half bit (65-128 / fc) in a valid bit window space, comparing the integral levels with set thresholds, and judging whether a data bit is 1 or 0; and carrying out bit output, and outputting a valid bit value. According to the method and the circuit, data receiving link decoding reliability and sensitivity are improved, and interference of circuit noises to the decoding circuit can be resisted.

Description

technical field [0001] The invention relates to a receiving decoding method and its circuit, in particular to a Manchester receiving decoding method and its circuit based on bit demarcation. Background technique [0002] Manchester Encoding (Manchester Encoding) is a synchronous clock encoding technology, which is widely used in data transmission. Contactless smart card data conforming to the ISO14443typeA standard is encoded in Manchester. [0003] The ideal data after demodulation by the analog circuit is as follows: image 3 As shown, but due to the interference of other parts of the circuit and the small received signal, the actual demodulated data is as follows Figure 4 shown. The conventional decoding method is to decode by the number of pulses in half a cycle. When multiple pulses are combined (smeared) in the demodulated data, errors will occur in data decoding. Contents of the invention [0004] The technical problem to be solved by the present invention is to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L7/00H03M5/12
CPCH03M5/12H04L1/0036H04L1/0045H04L7/0079
Inventor 郝春杰李鹏飞
Owner 广东中成卫星微电子发展有限公司
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