Blind estimation method for underdetermined hybrid frequency hopping parameters based on time frequency diagram correction

A time-frequency diagram and blind estimation technology, applied in baseband system components, transmission systems, electrical components, etc., can solve the problems of poor performance, great influence of signal-to-noise ratio, and high algorithm complexity, and achieve improved anti-noise capability, The effect of clear time-frequency diagram and accurate estimation

Inactive Publication Date: 2015-04-01
XIDIAN UNIV +1
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Problems solved by technology

This type of method has a huge time-frequency atomic dictionary and high algorithm complexity
At present, most algorithms are only suitable for the parameter estimation of a single frequency hopping signal. The characteristic matrix joint approximate optimization algorithm can separate multiple frequency hopping signals, and then use the time-frequency analysis method to estimate the parameters of multiple frequency hopping signals. But this method is only suitab

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  • Blind estimation method for underdetermined hybrid frequency hopping parameters based on time frequency diagram correction
  • Blind estimation method for underdetermined hybrid frequency hopping parameters based on time frequency diagram correction
  • Blind estimation method for underdetermined hybrid frequency hopping parameters based on time frequency diagram correction

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[0031] The embodiments of the present invention will be described in detail below in conjunction with the drawings and examples. The drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention. Invention does not constitute an improper limitation of the present invention.

[0032] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0033] Step 1 Perform short-time Fourier transform on the received observation signal x(t) to obtain its time-frequency matrix as follows:

[0034] X ^ ( p , q ) = Σ t = p · L ...

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Abstract

The invention discloses a blind estimation method for underdetermined hybrid frequency hopping parameters based on time frequency diagram correction in order to mainly solve the problem of large estimation errors caused by a poor signal to noise ratio in the prior art. The method comprises the following implementation steps: (1) performing short-time Fourier transformation on a signal to obtain a time frequency matrix of an observed signal; (2) calculating an energy matrix of the time frequency matrix; (3) correcting the time frequency diagram; (4) estimating frequency hopping signal parameters according to the corrected time frequency diagram. The method disclosed by the invention can be used for obtaining a clear time frequency diagram at a low signal to noise ratio, has the advantage of improving the estimation precision of the frequency hopping signal parameters, and can be applied to various frequency hopping communication scenes.

Description

technical field [0001] The invention belongs to the field of signal processing, in particular to an underdetermined mixed frequency hopping parameter blind estimation method, which can be used in the fields of frequency hopping communication reconnaissance, non-cooperative frequency hopping communication, military communication and the like. Background technique [0002] In recent years, frequency hopping communication technology has been widely used in various communication scenarios due to its strong anti-interference ability, good confidentiality and easy networking. One of the main tasks of researching frequency hopping communication technology is to estimate the characteristic parameters of frequency hopping signals. [0003] At present, the method based on time-frequency analysis is a commonly used method for blind estimation of frequency-hopping signal parameters. This type of method first uses some time-frequency analysis tools such as short-time Fourier change WVD, ...

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Application Information

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IPC IPC(8): H04B1/715H04L25/02
Inventor 付卫红熊超黑永强刘乃安李晓辉陈杰虎杨博
Owner XIDIAN UNIV
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