Interference resisting method for communication receiver based on blind signal separation and system thereof

Abstract

The invention discloses a communication receiver anti-interference method on the basis of blind signal separation and a system thereof, wherein the method comprises: utilizing a positive-negative 45 degree dual polarization antenna module to receive signals, changing a two way high frequency signal into an intermediate frequency analog signal, outputting an intermediate frequency digital signal by the intermediate frequency analog signal through analogue / digital conversion and after an orthogonal transformation module, then, carrying out digital down conversion, abstracting, filtering, and the like, transforming into a DSP baseband complex signal, obtaining a statistical independent signal after two ways are separated by the complex signal after passing through a linear blind signal separation algorithm module, carrying out self-adaptive equalization processing to a two way estimating signal after blind separation, counteracting crosstalk in a communication channel, utilizing a known modulation and demodulation method to demodulate a two way independent signal, analyzing a two way signal, and abstracting a useful signal. The invention does not need to use any other reference signals, adopts the linear blind signal separation algorithm to estimate the two way independent separation signal, the calculation complexity is low, and the disturbance to the communication receiver under the condition of low signal-to-noise ratio can be eliminated.

Description

technical field [0001] The invention relates to communication technology, in particular to a communication receiver anti-interference method and system based on blind signal separation. Through the application of this technology, interference can be effectively eliminated and communication quality can be improved. Background technique [0002] The earliest origin of blind signal processing is the famous cocktail party problem (CPP, cocktail party problem) proposed by Colin Cherry, which refers to the extraordinary ability of humans to pay attention to and identify one of the sound sources in a noisy environment. With the recent development of blind signal separation technology, there are various better solutions to the cocktail party problem. In recent years, the research on blind signal processing has become an attractive hot issue in the field of signal processing. Blind signal separation is an important aspect of blind signal processing. It refers to identifying the syst...

AI Technical Summary

Problems solved by technology

But for the actual wireless communication channel, each element of the mixing matrix can no longer be regarded as a constant, the received signal may be convolution aliasing, and there is inter-symbol interference. In this case, the linear blind signal separation method is used for anti-interference The effect will be affected, but if blind deconvolution technology is adopted, it is not very realistic in terms of algorithm complexity and calculation amount in the existing technology

[0008] In the currently published interference suppression method based on blind separation, the blind signal extraction device mentioned in the public specification of the patent CN101034900A by Civil Aviation University of China, for the radio frequency receiving module, it is mentioned that two channels of VHF signals are received by dual antennas , and then carry out follow-up processing. At this point, it should be pointed out that the dual antennas are used to receive two VHF signals. The placement of the dual antennas needs to meet certain requirements. Two identical aliased signals are received, making subsequent blind signal separation a pathological situation

Moreover, the location of the antenna limits the flexible application of the receiver

Images