Low signal-to-noise ratio short preamble burst signal demodulation system and method

Abstract

The present invention discloses a low signal-to-noise ratio short preamble burst signal demodulation system and method. A burst signal detection module detects in real time whether a received signal includes an MPSK signal, if the received signal includes the MPSK signal, an initial position and an ending position of the MPSK signal are offered; then, a coarse frequency synchronization and time synchronization module realizes time synchronization point tracing and coarse frequency offset correction of the signal according to the preamble of the burst signal and the initial position of the MPSK signal; then, sampling timing synchronization and fine frequency offset compensation and phase offset correction are respectively performed by a timing synchronization module and a fine frequency synchronization module on the signal; and finally, a phase unwrapping and de-mapping module completes phase unwrapping and bit decoding. According to the method, time synchronization of the demodulation system is before timing sampling synchronization, a parameter estimation module is reused, while the processing time is not increased, the accuracy of coarse frequency estimation and time synchronization is greatly improved, and hardware resource consumption is reduced greatly.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a demodulation system and method of a short preamble burst signal with a low signal-to-noise ratio. Background technique [0002] The burst communication system has been widely used in various fields such as mobile communication, emergency communication, and satellite communication. The biggest feature of burst communication is that the initiation time of communication is uncertain, and in some application scenarios, there is even the possibility of random changes in communication duration and signal power. , one of the main tasks of the burst communication receiver is to detect the signal within the specified time and give the estimated value of related parameters. For the communication between high-speed moving carriers such as satellites and missiles, that is, in a high-dynamic environment, there are The strong Doppler effect, which brings severe challenges t...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a demodulation system and method of a low signal-to-noise ratio short preamble burst signal, aiming at solving the problem of the signal-to-noise ratio E s / N 0 The problem of signal demodulation in the MPSK modulation burst communication system of less than or equal to 2dB, the burst dynamic range is less than or equal to 10dB, and the preamble length is less than or equal to 32 modulation symbols, and the frame loss rate is less than 1×10 -4 , The demodulation loss is less than 0.5dB technical index

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