Demodulator Based on Geometric Feature Judgment of Shock Filtering Response of EBPSK Signal

Abstract

The invention provides a geometric feature discrimination demodulator based on EBPSK (Extended Binary Phase Shift Keying) signal impulse filter response, which comprises a digital impulse filter and a geometric feature discriminator, wherein the digital impulse filter consists of a pair of conjugate zeroes and at least two pairs of conjugate poles, the signal carrier frequency of the digital impulse filter is higher than the zero frequency but lower than all pole frequencies, the close degree between the zero frequency and the pole frequencies at least reaches to 10-3 magnitude of the signal carrier frequency, the geometric feature discriminator extracts and memorizes the geometric feature and the internal relation of signal waveforms enhanced through the impulse filter by use of an artificial neural network sorter, and makes a united decision on all corresponding sampling points of output waveforms of the EBPSK impulse filter within n (n is greater than or equal to 1) code element periods, thus, the demodulator can still keep the good demodulating performance in complex working conditions such as high Gaussian white noise, intersymbol interference and channel fading, and has strong robustness and adaptivity.

Description

technical field [0001] The invention relates to a digital communication system, in particular to a demodulator based on geometric feature judgment of EBPSK signal shock filter response, belonging to the field of digital communication and nonlinear signal processing Background technique [0002] 1. Inverted phase modulation and short cycle modulation [0003] The rapidly growing demand for broadband wireless services puts forward higher and higher requirements for wireless communication, which directly leads to more and more crowded radio frequencies in the air, especially with the third generation (3G) and fourth generation (4G) broadband mobile With the development of communication networks, the contiguous spectrum of lower frequency bands is almost exhausted. The auction price for the right to use 10MHz spectrum for 20 years in Europe has reached 4 billion euros. In my country, it is difficult to buy the most favorable frequency and bandwidth with money. Therefore, like ...

AI Technical Summary

Problems solved by technology

Although this is simple and classic, it only uses part of the information (amplitude of signal shock) or local information (position of signal shock) of EBPSK modulation signal shock filter response waveform.

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