8FSK modulation and demodulation method based on 2G-ALE

Abstract

The invention provides an 8FSK modulation and demodulation method based on 2G-ALE. The 8FSK modulation and demodulation method comprises the steps that a sending end generates an ALE standard word according to instruction information; coding the information bit and the supervision bit according to a coding rule; performing bit-by-bit grouping interleaving on the code, and adding a flag bit code at the end of the code to generate interleaving code information; and performing redundant repetition on the interleaved coding information, and modulating the coding information after redundant repetition to generate a modulation signal. And the receiving end filters the modulation signal to generate a demodulation signal. And performing symbol synchronization, redundancy elimination processing and de-interleaving processing on the demodulation signal. And performing decoding processing according to a decoding rule to generate an ALE standard word, and generating instruction information through the ALE standard word. According to the 8FSK modulation and demodulation method based on the 2G-ALE, rapid detection, synchronization and processing of signals can be achieved, and good anti-noise performance and comprehensive channel quality are achieved.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a 2G-ALE-based 8FSK modulation and demodulation method. Background technique [0002] Shortwave communication plays an indispensable and important role in the fields of military and emergency communication. It is an earlier and widely used wireless communication method. With the development of communication technology, one of the cores of modern short-wave communication system research is the automatic link establishment system (Automatic Link Establishment, ALE), which focuses on self-adaptation and networking communication technology. Taking 2G-ALE system as an example, through The waveform detects the channel in real time, and realizes the automatic establishment of the link through the three-way handshake of calling, answering and confirming. The calling party repeatedly sends the paging signal at a specific time, while the called party continuously scans a...

AI Technical Summary

Problems solved by technology

However, the existing ALE system has a slow detection speed for signals, and at the same time has poor processing capabilities for signal parameters such as bit error rate, signal-to-noise ratio, and comprehensive channel quality, so it cannot meet the needs of actual use.

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