Random bit rate adaptive QPSK demodulation system and method
A demodulation system and code rate technology, applied in the field of QPSK demodulation system with adaptive code rate at any code rate, can solve the problems of low sampling rate utilization rate and poor adaptability of demodulation method, etc.
Active Publication Date: 2017-08-11
XIDIAN UNIV
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[0007] The purpose of the present invention is to overcome the above-mentioned defects in the prior art, and propose an arbitrary code rate adaptive QPSK demodulation system and method, which are used to solve the poor adaptability of the existing multi-level code rate adaptive demodulation system and the existing Technical Problem of Low Sampling Rate Utilization in Demodulation Method
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[0064] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0065] refer to figure 1 , an arbitrary code rate adaptive QPSK demodulation system, including a data acquisition module 1, an optimal sampling rate selection module 2, a filter coefficient generation module 3, an adaptive Costas loop module 4, a resampling module 5 and a bit synchronization decision output Module 6, the data acquisition module 1 and the optimal sampling rate selection module 2 form a closed-loop feedback structure, which is used to dynamically adjust the sampling frequency of the data acquisition module 1 according to the code rate estimation result of the digital signal converted from the analog modulation signal, in:
[0066] The data acquisition module 1 is used to convert the received analog modulation signal S according to the sampling clock of the module 1 converted into high-speed digital signal S 2 or low-speed dig...
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The invention provides a random bit rate adaptive QPSK demodulation system and method and aims to solve a problem of poor adaptability of a multi-bit rate adaptive demodulation system and technical problems of low sampling rate and low utilization rate existing in a demodulation method in the prior art. The system comprises a data acquisition module, an optimal sampling rate selection module, a filtering coefficient generation module, an adaptive Costas ring module, a re-sampling module and a bit alignment decision output module, wherein the data acquisition module and the optimal sampling rate selection module form a closed loop structure. The realization method comprises steps that a simulation modulation signal is sampled through a highest sampling rate to acquire a high-speed digital signal; a bit rate of the high-speed digital signal is estimated; optimal sampling frequency is calculated; the simulation modulation signal is sampled through the optimal sampling frequency to acquire a low-speed digital signal; digital down conversion and low pass filtering for the low-speed digital signal are carried out; integer sampling-rate conversion for the signal after filtering is carried out; bit synchronization for the signal after integer sampling-rate conversion is carried out, and decision output is lastly carried out to acquire an original code element.
Description
technical field [0001] The invention belongs to the technical field of digital communication, and relates to an arbitrary code rate self-adaptive QPSK demodulation system and method, which can be used in a QPSK demodulation system where the carrier rate has been agreed with the modulation end and the code rate is unknown and arbitrary. Background technique [0002] Digital communication technology has become the mainstream of contemporary communication technology, and in digital communication system, digital modulation and demodulation is an indispensable component and an important means of communication signal transmission technology. [0003] Digital modulation is a process in which a useful baseband signal is loaded onto a higher frequency carrier signal by means of digital signal processing. Digital demodulation is the inverse process of digital modulation. It is a process of extracting the original useful baseband signal from the modulated signal by using digital signal...
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IPC IPC(8): H04L27/227H04L27/233H04L27/38H04L25/02
CPCH04L25/0262H04L27/2273H04L27/2334H04L27/3827
Inventor 王海郑东莉张敏刘岩赵伟秦红波
Owner XIDIAN UNIV