Multi-gear code rate adaptive demodulation system and method based on neural network

Abstract

The invention provides a multi-gear code rate adaptive demodulation system and method based on a neural network so as to solve the technical problems of high complexity of realization of an existing multi-gear code rate adaptive demodulation system and large computation amount of a demodulation method. In the demodulation system, an ADC sampling module samples an analog modulation signal; a code element feature point extraction module carries out detection on phase jump points of the sampled signal by utilizing a one-dimensional convolution neural network trained by a neural network construction module; a code rate estimation module estimates code rate of the sampled signal according to the detection result; a signal-to-noise ratio estimation module estimates signal-to-noise ratio of the sampled signal; a controller module selects low-pass filter coefficients and an interpolation structure of a demodulation module according to the code rate estimation result and the signal-to-noise ratio estimation result, and calculates sampling rate conversion ratio of the demodulation module; and finally, the demodulation module carries out demodulation on the sampled signal according to the selected low-pass filter coefficients and the interpolation structure as well as the calculated sampling rate conversion ratio.

Description

technical field [0001] The invention belongs to the technical field of digital communication, and relates to a multi-level code rate adaptive demodulation system and method based on a neural network, which can be used for a phase shift key whose carrier rate is known and the code rate changes in the known multi-level code rate control (PSK) demodulation system. Background technique [0002] Digital modulation and demodulation technology is an essential part of digital communication systems. The so-called modulation refers to the process of loading the baseband signal onto a higher frequency carrier signal in order to facilitate the transmission of the baseband signal; demodulation is the inverse of modulation. The process is the process of recovering the original baseband signal from the modulated signal, while digital modulation and demodulation uses digital signal processing methods to achieve modulation and demodulation. [0003] According to the different carrier parame...

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Problems solved by technology

[0006] The present invention aims at the shortcomings of the above-mentioned existing systems and methods, and proposes a multi-level code rate adaptive demodulation system and method based on neural networks, utilizing the characteristics that PSK modulation signals have only limited phases and neural networks can be used for classification, Estimate the code rate of the sampled signal with an unknown code rate gear, so as to realize the adaptive demodulation of multi-code rate, which is used to solve the high complexity and demodulation of the existing multi-code rate adaptive demodulation system The method is computationally intensive for technical issues

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