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LFM signal modulation parameter estimation method under Alpha stable distribution noise

A signal modulation and stable distribution technology, which is applied in pilot signal distribution, digital transmission system, frequency modulation carrier system, etc., can solve the problem of high complexity of LFM signal modulation parameter estimation, time-frequency aggregation dependent parameter selection, and poor time-frequency aggregation and other problems, to achieve the effect of improving time-frequency aggregation, suppressing impulse noise, and good recognition effect

Active Publication Date: 2018-03-13
XIDIAN UNIV +1
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Problems solved by technology

[0003] In summary, the existing problems in the existing technology are: the existing time-frequency analysis methods have poor time-frequency aggregation, or the time-frequency aggregation depends heavily on parameter selection. In addition, the LFM signal modulation parameter estimation technology under non-Gaussian noise Higher complexity and lower reliability

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  • LFM signal modulation parameter estimation method under Alpha stable distribution noise
  • LFM signal modulation parameter estimation method under Alpha stable distribution noise
  • LFM signal modulation parameter estimation method under Alpha stable distribution noise

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[0038] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0039]The LFM signal has a large time-width-bandwidth product, which makes the LFM signal have a certain anti-Doppler ability compared to other signals. Therefore, LFM is often used as a synchronization signal in underwater acoustic communication systems, and the spread spectrum based on LFM The application of the system in medium and long-distance underwater acoustic communication is also gradually increasing.

[0040] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0041] Such as figure 1 As shown, the method for estimating the modulat...

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Abstract

The invention belongs to the technical field of non-stationary signal modulation and analysis, and discloses an LFM signal modulation parameter estimation method under alpha stable distribution noise.The method comprises the following steps of carrying out generalized extension linear chirplet transform on a received LFM signal to obtain a time-frequency analysis image; carrying out Radon transform on the time-frequency analysis image, calculating a maximum value of the time-frequency analysis image, and estimating an angle estimation frequency modulation slope corresponding to the maximum value; and constructing a demodulation reference signal by utilizing the frequency modulation slope, multiplying the demodulation reference signal by an original signal to obtain a demodulation signal,carrying out generalized Fourier transform on the demodulation signal, and estimating an initial frequency by utilizing the position of the maximum value. When a generalized signal-to-noise ratio is larger than 0dB, a normalized mean square error of the frequency modulation slope estimation of the LFM signal is smaller than -33dB; and when the generalized signal-to-noise ratio is larger than -6dB,the normalized mean square error of the initial frequency estimation of the LFM signal is less than or equal to -22.4dB.

Description

technical field [0001] The invention belongs to the technical field of non-stationary signal modulation analysis, in particular to a method for estimating LFM signal modulation parameters under Alpha stable distributed noise. Background technique [0002] Linear Frequency Modulation (LFM) signal is a typical non-stationary signal, which is widely used in radar, sonar, geological exploration and biomedical systems. At the same time, the LFM signal has a large time-width-bandwidth product, which makes the LFM signal have a certain anti-Doppler ability compared with other signals. Therefore, LFM is often used as a synchronization signal in underwater acoustic communication systems, and the LFM-based The application of spread spectrum system in medium and long-distance underwater acoustic communication is also gradually increasing. Center frequency and frequency modulation slope are the basic parameters to characterize the frequency characteristics of LFM signals, so the estima...

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Application Information

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IPC IPC(8): H04L27/14H04L27/16H04L5/00
CPCH04L5/0048H04L27/14H04L27/16
Inventor 张俊林刘明骞
Owner XIDIAN UNIV
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