Amplitude shift keying demodulation method, device and equipment and computer readable storage medium

Abstract

The invention discloses an amplitude shift keying (ASK) demodulation method, an ASK demodulation device, ASK demodulation equipment and a computer readable storage medium. The method comprises the following steps: sampling an envelope signal according to a set frequency to obtain an envelope detection data stream, wherein the envelope signal is obtained after envelope detection processing is carried out on a signal to be demodulated; wherein the envelope detection data stream comprises a plurality of bits; each bit comprises M sampling values; obtaining a first average value of forward N bitsof the first bit and a second average value of backward N bits of the first bit; determining a forward decision result of the first bit based on the first average value and the M sampling values of the first bit, and determining a backward decision result of the first bit based on the second average value and the M sampling values of the first bit; determining a judgment mode matched with the first bit based on the forward judgment result and the backward judgment result; and obtaining a demodulation result based on the judgment result corresponding to each first bit in the envelope detectiondata stream.

Description

technical field [0001] The present invention relates to the technical field of signal modulation and demodulation, in particular to an amplitude shift keying (ASK, AmplitudeShift Keying) demodulation method, device, equipment and a computer-readable storage medium. Background technique [0002] In the field of signal modulation technology, the modulation method in which the amplitude variation of the carrier signal is controlled by a digital baseband signal is called ASK, and it can also be called digital amplitude modulation. ASK represents digital signals "1" and "0" by changing the amplitude of the carrier signal. For example, the amplitude A1 of the carrier signal represents the digital signal "1", and the amplitude A2 of the carrier signal represents the digital signal "0". For ASK demodulation, envelope detection is usually used to demodulate the modulated signal. The specific process includes: filtering the modulated signal, envelope detection, sampling and judgment, ...

AI Technical Summary

Problems solved by technology

However, in some specific application scenarios, for example, in the 5G fronthaul optical transmission channel, the average power of the optical signal transmitted by the transmitting end as the carrier signal is variable, then the modulation received by the receiving end of the transmission channel The average power of the signal also changes. In this case, certain problems are brought about in the sampling judgment process in the demodulation process: if a fixed judgment level is used, misjudgment will inevitably occur when the optical signal power changes; Dynamic level judgment, but the design of its hardware circuit is relatively complicated, and most of the dynamic judgments are to adjust the judgment level after the average power of the optical signal is found, which will cause the judgment result to be invalid for a period of time

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