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Demodulating method of binary carrier shift key-controlling system based on Hibert transform

A technology of frequency shift keying system and demodulation method, which is applied in the field of demodulation of binary frequency shift keying system based on Hilbert-Huang transform, and can solve the difficulty of physical implementation without giving the basis for discrimination of symbol polarity etc. to achieve flexible processing, good anti-noise performance, and simple physical implementation

Inactive Publication Date: 2009-06-03
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

This method is effective in signal detection, but its disadvantage is that if the amplitude spectrum is obtained through the autocorrelation function, the modulated signal needs to be sampled many times within the unit symbol width (in theory, the number of samples should tend to be infinite). There will be difficulties in physical realization of high bit rate data transmission in the system; although the modulation information of the signal can be identified from the distribution of the amplitude spectrum, there is no basis for judging the polarity of the symbol in the literature

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  • Demodulating method of binary carrier shift key-controlling system based on Hibert transform
  • Demodulating method of binary carrier shift key-controlling system based on Hibert transform
  • Demodulating method of binary carrier shift key-controlling system based on Hibert transform

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Embodiment Construction

[0027] Such as figure 2 As shown, in order to better understand the present invention, the implementation of the method will be further described below in conjunction with the accompanying drawings and specific embodiments. The example parameters are set as follows: set the binary frequency shift keying transmission sequence to be 1010 1010 1000 0110, and each symbol width for T s , when the symbol "0" is sent, the carrier frequency is f 1 =6000Hz, when sending symbol "1", the carrier frequency is f 2 =9200Hz, the signal-to-noise ratio is SNR=3dB, and the length of the received signal sequence is 16T s . The specific implementation process of this example is as follows:

[0028] 1) Firstly, band-pass filtering is performed on the signal sequence.

[0029] 2) Perform HHT processing on the received signal sequence to get the following image 3 The instantaneous frequency distribution of the signal is shown.

[0030] 3) In the time-frequency domain, the decision threshold...

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Abstract

The method includes: 1) the necessary band-pass filtering is made for received signal waveform in the binary frequency shift keying modulation; 2) a HHT processing is made for the processed signal waveform to get the instantaneous frequency distribution of the received signal waveform; 3) in time-frequency distribution domain, in term of given discrimination criterion, determining the polarity of received signal and completing demodulation.

Description

technical field [0001] The invention relates to a method in the field of radio technology, in particular to a demodulation method for a binary frequency shift keying (2FSK) system based on Hilbert-Huang transform (HHT). Background technique [0002] HHT is an adaptive non-stationary signal time-frequency analysis method, which includes empirical mode decomposition (EMD) and Hilbert (Hilbert) spectrum analysis two parts. Based on the changing characteristics of the signal itself, the method adaptively analyzes the instantaneous frequency distribution of the signal in the time-frequency domain. At present, the HHT method is mainly used in the analysis and processing of some non-stationary signals in nature (such as seismic waves, tides, sonar echoes, etc.). "The Empirical Mode Decomposition and the Hilbert Spectrum for Nonlinear and Non-stationary Time Series Analysis" published by Norden E. Huang and Steven R. Long et al. , Proc.R.Soc.Lond.A (1998) 454, 903-995), discusses ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/156
Inventor 金荣洪毛炜耿军平李家强
Owner SHANGHAI JIAO TONG UNIV
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