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Method for detecting and suppressing Gaussian fitting linear frequency-modulated jamming in direct sequence spread spectrum (DSSS) communication system

A linear frequency modulation and Gaussian fitting technology, applied in transmission systems, multi-frequency code systems, electrical components, etc., can solve problems such as heavy computational burden and large search space.

Inactive Publication Date: 2011-01-19
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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  • Method for detecting and suppressing Gaussian fitting linear frequency-modulated jamming in direct sequence spread spectrum (DSSS) communication system
  • Method for detecting and suppressing Gaussian fitting linear frequency-modulated jamming in direct sequence spread spectrum (DSSS) communication system
  • Method for detecting and suppressing Gaussian fitting linear frequency-modulated jamming in direct sequence spread spectrum (DSSS) communication system

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[0095] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0096] 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 chirp interference exists, use the short-time Fourier transform to construct a two-dimensional time-frequency map, and track the peak line trajectory, and use linear regression technology to obtain the peak line equation parameters and roughly estimate the chirp slope and the rotation angle α of the fractional Fourier transform; (3) Verify the assumption and parameter optimization: perform the fractional Fourier transform according to the parameter α, if there is a significant peak, the detection is successful, and iteratively optimize the parameters, using an iterative Gaussian approximation The combin...

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Abstract

The invention provides a method for detecting and suppressing Gaussian fitting linear frequency-modulated jamming in a direct sequence spread spectrum (DSSS) communication system. The characteristic that data frequency spectrum transmitted in an information channel in the DSSS communication system is similar to white noise is used, if the linear frequency-modulated jamming is exerted, a strong peak value exists on an instantaneous energy frequency spectrum and an obvious peak value line exists in a time-frequency energy distribution plane. At the receiving end of the DSSS communication system, the extreme point of each time point in the time-frequency energy distribution plane is tracked, so that the track of the peak value line is obtained. A linear regression technology is used to acquire parameters of the peak value so as to roughly estimate linear frequency-modulated slope rate and rotation angle alpha of fractional Fourier transform. According to the parameter alpha, the fractional Fourier transform is carried out on a signal, and an iterative Gaussian fitting process is used to exactly search to obtain the optimal alpha. The wave absorbing processing is performed in the optimal fractional Fourier transform domain so as to suppress the linear frequency-modulated jamming. The de-noised signals are output to the follow-up 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 ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04L27/26
Inventor 尹清波申丽然郭黎利张晓林任立群齐琳
Owner HARBIN ENG UNIV
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