Anti-interference method and system

Abstract

The invention discloses an anti-interference method. The method includes the following steps that: narrowband interference of instant branch frequency-domain signals and time-delayed branch frequency-domain signals are filtered out; the anti-interference filter weight of the instant branch frequency-domain signals or time-delayed branch frequency-domain signals of which the narrowband interference is filtered out is calculated; and anti-interference filtering processing is performed on the instant branch frequency-domain signals and the time-delayed branch frequency-domain signals of which the narrowband interference is filtered out by using the anti-interference filter weight. The invention also provides an anti-interference system. With the anti-interference method and the system of the invention adopted, the significant digits of anti-interference input signals can be effectively reduced, resources required by back-end processing can be decreased, the degree of freedom of anti-interference can be increased, and an anti-interference ability can be still enabled when the total amount of broadband interference and narrowband interference is greater than the number of array elements.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, to an anti-jamming method and system, in particular to an anti-jamming method and system for pre-filtering narrow-band interference. Background technique [0002] Wireless communication technology plays an increasingly important role in the field of modern communication, but because the wireless signal is extremely weak, it is vulnerable to various natural or man-made interferences and cannot be used. Therefore, it is necessary to introduce interference suppression technology to improve the resistance of wireless communication systems. Interference ability. In view of the limited anti-jamming effect of the current anti-jamming technology purely in the air domain, time domain, and frequency domain, it is necessary to use a combination of multiple anti-jamming methods. [0003] Space-frequency joint anti-jamming is the current anti-jamming method with better anti-jamming per...

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Problems solved by technology

[0003] Space-frequency joint anti-jamming is the current anti-jamming method with better anti-jamming performance. A large number of domain data bits will result in insufficient precision or high resource usage during anti-interference processing

[0004] An anti-jamming method in the prior art adopts frequency domain and space domain cascading method. Firstly, the frequency domain method is used to suppress narrowband interference, and then beamforming is realized in the space domain. The implementation process needs to be transformed into After the narrowband interference is removed in the frequency domain, it is transformed to the time domain for spatial filtering. Although the degree of freedom of anti-interference can be increased, the disadvantages of the above-mentioned prior art are: the design and implementation are relatively complicated, and the advantages of FFT changes are not fully utilized. At the same time, due to the loss of phase information, the signal after narrow-band filtering will not be very effective in the anti-interference processing of the airspace.

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