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Time-Domain Adaptive Narrowband Interference Suppression Filter and Method with Bilateral Tap Structure

A tap structure, narrow-band interference technology, applied in the field of time-domain adaptive narrow-band interference suppression filter and filtering, can solve the problems of DSSS signal damage, system performance degradation, etc., to ensure normal working performance, save system resources, and occupy less resources Effect

Inactive Publication Date: 2016-06-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

As a result, not only narrow-band interference signals are suppressed, but useful DSSS signals are also damaged, and system performance is reduced

Method used

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  • Time-Domain Adaptive Narrowband Interference Suppression Filter and Method with Bilateral Tap Structure
  • Time-Domain Adaptive Narrowband Interference Suppression Filter and Method with Bilateral Tap Structure
  • Time-Domain Adaptive Narrowband Interference Suppression Filter and Method with Bilateral Tap Structure

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Embodiment Construction

[0038] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0039] This specific implementation manner takes a common DS / BPSK receiver as an example.

[0040] figure 1 Each functional block of the DS / BPSK receiver is shown. The RF front-end processing module receives all visible signals through the antenna, and after being filtered and amplified by the pre-filter and pre-amplifier, it is mixed with the sine wave local oscillator signal generated by the local oscillator and down-converted to an intermediate frequency (IF) signal, and then through a digital-to-analog (A / D) converter with a bit width of 12 bits, the intermediate frequency signal is converted into a discrete-time digital intermediate frequency sample.

[0041] The time-domain adaptive narrowband interference suppression filter proposed by the present invention belongs to a component part of the digital signal processor, and its position in the system...

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Abstract

The invention discloses a time domain self-adaptation narrow-band interference suppression filter of a double-side tap structure and a method. In the time domain self-adaptation narrow-band interference suppression filter of the double-side tap structure, the weight of a center tap is one, the weights of a left tap adjacent to the center tap and a right tap adjacent to the center tap are zero, and the weights of the rest of the taps in all levels are updated with LMS arithmetic iteration. By means of the time domain self-adaptation narrow-band interference suppression filter and the method, correlations, caused by sampling at the Nyquist rate, between adjacent sampling values of DSSS signals can be avoided, so that narrow-band interference suppression is achieved, and meanwhile useful signals are not damaged; the normal working performance of the system is guaranteed.

Description

technical field [0001] The invention relates to a direct sequence spread spectrum system interference suppression technology in the field of digital signal processing, in particular to a time-domain self-adaptive narrow-band interference suppression filter and filtering method based on a spaced bilateral tap structure. Background technique [0002] Direct Sequence Spread Spectrum (DSSS for short) technology is widely used in satellite navigation and other fields due to its good concealment and ability to resist multipath and multiple access interference. However, during operation, the direct sequence spread spectrum system will be subject to interference from the natural environment and man-made. When it exceeds the system spreading gain, additional interference suppression measures are required to intervene to ensure the normal working performance of the system. One of the conventional narrowband interference suppression technologies in spread spectrum systems is the time-d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707
Inventor 柯晟罗士荀王帅刘泳庆王爱华邵晓田
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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