A method for decoding and processing external signals at the receiving end based on zero-crossing detection during am demodulation

Abstract

The invention relates to a method for realizing decoding processing of a receiving end external signal based on zero-crossing detection in an amplitude demodulation (AM) process. The method comprises the following steps: (1) performing statistics to obtain a positive value count and a negative value count of a signal through a zero-crossing detection method; (2) correcting a waveform of the signal according to the positive value count and the negative value count, and performing statistics to obtain a correct positive value count and a correct negative value count; (3) performing bit 0 decision and bit 1 decision according to the correct positive value count and the correct negative value count; (4) decoding a complete frame according to a bit 0 decision result and a bit 1 decision result; and (5) performing frame checkout on the complete frame. Through adoption of the method for realizing decoding processing of the receiving end external signal based on the zero-crossing detection in the AM process, an original demodulation circuit does not need to be changed; all decoding work is finished with only a small quantity of hardware circuits; modification becomes convenient; the resource consumption is low; and the bit error rate is lowered greatly compared with a conventional algorithm. The method basically conforms to a current actual engineering requirement.

Description

technical field [0001] The present invention relates to the field of computers, in particular to modulation and demodulation technology, in particular to a method for decoding and processing an external signal at a receiving end based on zero-crossing detection in an AM demodulation process. Background technique [0002] In the wireless charging and transmitting circuit, the signal is demodulated to form a waveform similar to the two-way differential coding. The code rate of the two-way differential coding is fixed at 2K, the "1" code jumps twice in one cycle, and the "0 code" is in the Jump once in a cycle. In practical applications, due to the noise interference of wireless transmission, electromagnetic interference of equipment, etc., the actual demodulated signal will not be so perfect, and the definition of bit 0 and bit 1 is often very vague. Once an error occurs in the decoding process, the entire All packets are lost, which is very inefficient for real-time wireless...

AI Technical Summary

Problems solved by technology

[0004] Although the traditional solutions can improve the decoding quality to a certain extent, they are only for a certain type of signal with special rules. If the signal is changed, the effect will be compromised, and the demodulation part adds an orthogonal channel, and the decoding Some compensation statistics will increase system overhead

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