CDMA communication anti-interference system based on frequency domain filtering

Abstract

The invention discloses a CDMA communication anti-interference system based on frequency domain filtering. The CDMA communication anti-interference system comprises a signal preprocessing portion, a frequency domain processing portion and a post-processing portion, wherein the signal preprocessing portion comprises an A / D collector, a digital down-converter, a low-pass filter and an extractor which are connected in sequence; the frequency domain processing portion comprises two routes, one route comprises a windowing device, an FFT device, a threshold value generating and spectral line processing device, an IFFT device and 50% delay device which are connected in sequence, the other route comprises a 50% delay device, a windowing device, an FFT device, a threshold value generating and spectral line processing device and an IFFT device which are connected in sequence, and finally, the two routes are connected with an adding device simultaneously; the post-processing portion comprises an interpolation device, a filter, a digital up-converter and a D / A converter which are connected in sequence. The invention further discloses a CDMA communication anti-interference method based on frequency domain filtering. By means of the system and the method, the anti-interference ability of the system is effectively enhanced.

Description

technical field [0001] The invention belongs to the technical field of communication system anti-jamming, and relates to a frequency-domain filtering-based CDMA communication anti-jamming system, and the invention also relates to a frequency-domain filtering-based CDMA communication anti-jamming method. Background technique [0002] CDMA communication is a kind of spread spectrum communication. Spread spectrum communication itself has a certain inhibitory effect on interference, especially narrowband interference. Because in the process of despreading, the frequency band of interference is broadened and the magnitude of interference is reduced. Therefore, the current spread The frequency communication system has been widely used in mobile communication systems. [0003] Although the inherent spread spectrum gain of the spread spectrum communication system itself can provide a certain ability to resist narrowband interference, the electromagnetic field environment in which th...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a CDMA communication anti-jamming system based on frequency domain filtering, which solves the problem that the performance of the CDMA communication system will obviously decline or even fail to work normally when subjected to narrow-band interference with relatively high power under the existing technical conditions

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