High-speed burst digital demodulation method and device

Abstract

The present invention provides a method and device for high-speed burst digital demodulation, wherein the method includes: processing the received signal through a front-end preprocessing module; filtering the preprocessed signal through a matched filter module; The matched and filtered signal is dynamically adjusted through the digital AGC module; the adjusted signal is sent to the burst detection and capture module; the captured burst signal is passed through the timing synchronization module to obtain the best sampling point and become single The data of the symbol rate is sent to the carrier recovery module; and the data processed by timing synchronization and carrier recovery are passed through the symbol decision module for symbol decision, thereby completing the entire burst demodulation process. The scheme of the invention can improve the burst demodulation efficiency, has good expansibility, and has advantages in burst capture, signal synchronization, running speed, and hardware and software implementation.

Description

technical field [0001] The present invention relates generally to the field of satellite communications. More specifically, the present invention relates to a method and device for high-speed burst digital demodulation of satellite communications. Background technique [0002] The first generation of communication satellites of the International Telecommunications Satellite Organization was put into commercial use in 1965, which marks that communication satellites have really entered a new stage of practicality, improvement and development. Over the years, in the fields of global communication, national defense communication, emergency communication, mobile communication, radio and television, and communication in remote areas, satellite communication systems have been fully and rapidly developed and play a key role. With the continuous expansion of the application field of satellite communication, people continue to explore the new system and new technology of satellite co...

AI Technical Summary

Problems solved by technology

[0005] The uplink signal of the satellite comes from different user terminals in the multimedia network, and there are problems such as Doppler frequency shift and oscillator accuracy, which will cause the carrier of the received signal to be incompletely synchronized with the local carrier, and there will be a certain deviation, resulting in The phase changes sharply, seriously affecting the performance of the burst demodulation system

[0006] At present, during burst communication transmission, a preamble word with a specific pattern is usually inserted in front of each burst data packet for clock and carrier synchronization. The preamble word as system overhead reduces data transmission efficiency. For short burst data packets, transmission Lower efficiency, not suitable for burst communication systems

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