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Narrow-band interference suppression method and device

A narrowband interference and suppression device technology, applied in transmission systems, electrical components, etc., can solve the problems of spread spectrum signal damage, large spread spectrum signal damage, energy leakage, etc., to avoid incomplete interference suppression, reduce energy leakage, and improve performance effect

Active Publication Date: 2013-01-30
PEKING UNIV
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Problems solved by technology

However, since the interference and the spread spectrum signal are not distinguished during processing, and the narrowband interference will leak energy in the FFT process, the algorithm will inevitably damage the spread spectrum signal, and the greater the interference, the greater the damage to the spread spectrum signal

Method used

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  • Narrow-band interference suppression method and device

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Embodiment Construction

[0034] Such as figure 1 As shown, the narrowband interference suppression method in a kind of spread spectrum system of the present invention is described in detail now, and its steps include:

[0035] 1) At the receiving end, the analog received signal is sampled by the ADC (analog-to-digital converter) to generate a discrete sequence, expressed as r(n), r(n)=s(n)+v(n)+w(n) , where n is the discrete sequence number, s(n) is the spread spectrum signal, v(n) is the narrowband interference signal, and w(n) is Gaussian white noise in the channel;

[0036] 2) Send the received signal r(n) into the time-domain adaptive filter, predict the narrowband interference signal v(n), and obtain the predicted narrowband interference signal

[0037] 3) The predicted narrowband interference Multiply by factor k (0≤k≤1) and subtract from received signal to get signal s 1 (n), s 1 ( n ) = ...

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Abstract

The invention relates to a narrow-band interference suppression method and a narrow-band interference suppression device. The device comprises an adaptive filter module, a fast Fourier transformation module, a narrow-band interference suppression module and a fast inverse Fourier transformation module. The method comprises the following steps of: 1) forecasting a dispersion sequence obtained through sampling to obtain a narrow-band interference forecast signal according to an adaptive algorithm; 2) multiplying the narrow-band interference forecast signal by a factor K to obtain a forecast factor signal, and subtracting the forecast factor signal from a received signal to obtain a first signal; 3) transforming the first signal to a frequency domain, and performing frequency domain wave trapping processing on the first signal in the frequency domain; and 4) converting the first signal subjected to frequency domain wave trapping into a second signal in a time domain, and inputting the second signal into a spread spectrum signal demodulator to finish narrow-band interference suppression. By the method, the shortcoming that a time domain adaptive filter cannot completely suppress the interference is overcome; and energy leakage in a frequency domain wave trapper is reduced.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a narrow-band interference suppression method in a spread spectrum system. Background technique [0002] The spread spectrum communication system has a certain anti-interference ability, but when the spread spectrum gain in the spread spectrum system is small or the interference intensity is large, it is very necessary to adopt an effective interference detection and suppression strategy at the receiving end of the spread spectrum system. According to different processing domains, the existing narrowband interference (Narrowband Interference, NBI) suppression algorithms can be divided into two categories: estimation and removal methods in the time domain and localization and suppression methods in the transform domain. [0003] Specifically, the time-domain algorithm generally uses the difference in correlation (that is, predictability) between the spread spectrum signal and ...

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Application Information

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IPC IPC(8): H04B1/71
Inventor 赵辉叶楠张诚赵玉萍李斗李红滨
Owner PEKING UNIV
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