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Adaptive filtering narrow-band interference suppression method with Doppler first-order change rate

A technology of adaptive filtering and adaptive filtering, applied in the field of communication, can solve the problems of inability to correctly estimate the interference situation, affecting the time-domain anti-interference performance, etc., and achieve the effect of improving the anti-interference performance and simple structure

Inactive Publication Date: 2020-08-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] For the defects in the existing technology: in the presence of Doppler and Doppler first-order rate of change, the time-domain adaptive filtering narrowband interference suppression method cannot correctly estimate the interference situation, which seriously affects the time-domain anti-interference performance

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  • Adaptive filtering narrow-band interference suppression method with Doppler first-order change rate
  • Adaptive filtering narrow-band interference suppression method with Doppler first-order change rate
  • Adaptive filtering narrow-band interference suppression method with Doppler first-order change rate

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Embodiment Construction

[0051] In order to describe in detail the technical content, achieved goals and effects of the present invention, the technical solutions in this embodiment will be clearly and completely described below in conjunction with the embodiments and accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0052] In direct sequence spread spectrum systems, the correlation characteristics of narrowband interference are much stronger than the signal itself. The basis of time domain adaptive filter anti-jamming algorithm is based on the strong correlation of narrowband interference. The interference is estimated in the state of superposition of narrowband interference and removed in the time domain....

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Abstract

The invention discloses an adaptive filtering narrow-band interference suppression method with a Doppler first-order change rate, and belongs to the technical field of communication. The adaptive filtering narrow-band interference suppression method comprises the steps that: a communication system receiving end inputs a received signal to an ADC module, the signal received by the communication receiving end is subjected to analog-to-digital conversion, digital down-conversion, low-pass filtering and an extraction module, and then data obtained after extraction is transmitted to a dechirp module; fractional Fourier transform is used for estimating the initial frequency offset and a frequency offset first-order change rate of the signal, a value output by the extraction module is compensatedby using the estimated value, and the signal is subjected to interpolation and then time-domain adaptive filtering anti-interference processing, thereby realizing time-domain adaptive filtering anti-interference in the presence of the Doppler first-order change rate, and improving the anti-interference performance of the communication system. According to the adaptive filtering narrow-band interference suppression method, an LMS adaptive filtering method is utilized to carry out time-domain anti-interference on the communication signal after frequency offset and frequency offset first-order change rate compensation, the structure is simple, and the implementation is easy.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to an adaptive filtering narrowband interference suppression method with Doppler first-order rate of change. Background technique [0002] Direct Sequence Spread Spectrum (DSSS) is to broaden the spectrum of the transmission signal with a pseudo-random sequence to improve the reliability of the communication system. It has the advantages of anti-interference, low interception, good confidentiality, and can realize code division multiple access communication. It is widely used in fields such as military and civilian communications. Although the direct-sequence spread spectrum technology has a certain anti-interference ability, but when the interference intensity exceeds the processing gain of the spread-spectrum signal, an interference suppression algorithm must be used to ensure the performance of the system. [0003] The interference suppression algorithm is divided into trans...

Claims

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Application Information

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IPC IPC(8): H04B1/71
CPCH04B1/71H04B1/7101
Inventor 王帅金鑫宋哲方金辉杨瑄赫卢琨闫伟豪卜祥元安建平
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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