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Quick chirp modulation interference detection and suppression method for direct-sequence spread-spectrum communication system

A technology for linear frequency modulation and communication systems, which can be used in transmission systems, electrical components, etc., and can solve problems such as heavy computational burden and large search space.

Inactive Publication Date: 2011-01-26
HARBIN ENG UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide a fast chirp interference detection and suppression method in a direct spread communication system that can overcome the problems of the existing chirp interference suppression method based on fractional Fourier transform, such as large search space and heavy calculation burden

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  • Quick chirp modulation interference detection and suppression method for direct-sequence spread-spectrum communication system
  • Quick chirp modulation interference detection and suppression method for direct-sequence spread-spectrum communication system
  • Quick chirp modulation interference detection and suppression method for direct-sequence spread-spectrum communication system

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Embodiment Construction

[0088] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0089] The principle block diagram of this method can be found in image 3 , including the following six stages: (1) Framing, truncating the data f(x) into shorter, overlapping data frames f 1 , f 2 ,..., f K-1 , f K ; (2) For each frame f i (x), assuming that the chirp interference exists, use the short-time Fourier transform to construct a two-dimensional time-frequency diagram to roughly estimate the chirp interference parameters, and obtain the chirp slope and the rotation angle α of the fractional Fourier transform; (3) verify the hypothesis and Parameter optimization: Carry out fractional Fourier transform according to parameter α. If there is a significant peak value, the detection is successful, and iteratively optimize the parameters, and use an iterative process to perform accurate search to obtain the linear frequency modulation interference slope a...

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Abstract

The invention provides a quick chirp modulation interference detection and suppression method for a direct-sequence spread-spectrum communication system. By taking full advantage of the characteristic that the data spectrum transmitted in a channel is similar to that of white noise in the direct-sequence spread-spectrum communication system, it is determined that a transient energy spectrum has high peak value and a time-frequency energy distribution plane must have obvious peak value lines due to the inference of a chirp modulation signal. The method comprises: at the receiving terminal of the direct-sequence spread-spectrum communication system, selecting several energy spectrum peak value points at different time on the time-frequency plane; roughly estimating a chirp constant and a rotation angle alpha of fractional order Fourier transform according to a linear rule; performing the fractional order Fourier transform (p=2alpha / pi) according to parameters; if an obvious peak value is detected, performing accurate search by using an iterative process, and performing wave-eliminating processing in a fractional order Fourier transform domain to suppress chirp modulation interference; and outputting the denoised signal to a subsequent processing process.

Description

technical field [0001] The invention belongs to the technical field of wireless data transmission and communication anti-interference, and relates to a method for detecting and suppressing chirp interference in direct sequence spread spectrum communication (direct spread communication for short). Background technique [0002] In the field of communication, interference suppression has always been a hot spot for researchers. At this stage, a large number of relatively mature theories and achievements have been made in narrowband interference suppression. The introduction of various research tools such as adaptive filtering, transform domain technology, and code-assisted technology provides more reliable and effective means for narrowband interference suppression. However, with the continuous deepening of research and the improvement of practical application requirements, broadband interference suppression has become a new research focus in this direction. In this case, the ...

Claims

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Application Information

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IPC IPC(8): H04B1/707
Inventor 申丽然尹清波郭黎利孙志国国强刘玉梅
Owner HARBIN ENG UNIV
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