Apparatus and method for frequency modulation interference suppression

Abstract

The invention discloses an interference signal suppression method of the frequency modulation classification. (a) The received signal is processed with log transformation and the instantaneous phase estimated value of the interference signal is obtained through the imaginary part of the signal; (b) the received signal is demodulated by the instantaneous phase estimated value of the interference signal; (c) a narrow-band filter is designed according to the output signal in procedure (b) and the output signal in procedure (b) is filtered to obtain the instantaneous amplitude estimated value; (d) the interference signal is reconstructed through the instantaneous phase estimated value obtained in procedure (a) and the instantaneous amplitude estimated value obtained in procedure (c); (e) the interference signal estimated component obtained in procedure (d) is eliminated from the original received signal to obtain the output signal after the interference signal is suppressed. The inventionalso discloses an interference signal suppression device of the frequency modulation classification; based on the theoretical derivation and the simulation experiment in the interference signal suppression method and device of the frequency modulation classification, when the frequency of the amplitude modulation item in the frequency modulation classification interference is low and the interference-to-signal ratio is less than 0dB, the interference suppression method is adopted to ensure the interference-to-signal ration to close to +3dB after the interference suppression; the receiving of the communication signal and the navigational positioning signal under the spread spectrum system is fulfilled completely.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a method and device for suppressing frequency modulation interference. Background technique [0002] Modern communication receivers and navigation receivers (such as GPS) are mostly based on electromagnetic wave reception in open space, and electromagnetic interference is one of the important factors affecting their receiving performance. Most of the modern communication receiver systems have certain anti-interference performance (such as spread spectrum receivers, wideband / ultra-wideband receivers, frequency hopping receivers, etc.), and have adopted a variety of anti-interference measures and means (such as time-domain filtering, Frequency domain filtering, spatial filtering, etc.), interference suppression capability is one of the important indicators to measure modern communication receivers. [0003] With the development of communication technology and the expa...

AI Technical Summary

Problems solved by technology

Since the spectrum of FM interference signals is generally wide, and the signal coverage in the time domain and frequency domain is large, it is difficult to achieve the best interference suppression performance based on filtering; when the interference signal is relatively large, the power advantage of the interference signal can be great The processing gain of the receiving system (such as spreading gain, matched filter gain, etc.) is weakened to a certain extent. The above-mentioned methods have great limitations for FM interference

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