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Multi-feed-source satellite interference suppression method based on spectrum sensing

A multi-feed satellite, interference suppression technology, applied in the field of communication, can solve the problems of time-varying, complex, weak signal at the satellite receiving end, etc., to achieve the effect of improving the signal-to-interference-noise ratio, reducing the number of beamforming times, and reducing the computational complexity

Active Publication Date: 2019-08-20
XI AN JIAOTONG UNIV
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Problems solved by technology

The angle of the target signal at the satellite end can be regarded as known, but the interference received has complex and time-varying characteristics. Therefore, when using the interference suppression technology based on the interference DOA signal, it is necessary to estimate the multi-source interference DOA, and the signal at the satellite receiving end is relatively large. Weak, so there is a need for an algorithm that can adapt and quickly adjust the interference suppression parameters according to the received signal in the case of small SNR

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  • Multi-feed-source satellite interference suppression method based on spectrum sensing
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  • Multi-feed-source satellite interference suppression method based on spectrum sensing

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Embodiment Construction

[0050] see figure 1 , is the scenario of a cognitive satellite communication system based on multi-feed and multi-beam. The invention provides a multi-feed satellite interference suppression method based on spectrum sensing. The multi-feed satellite receiving end has M receiving feed sources, and the multi-feed multi-beam satellite can be equivalent to a multi-antenna satellite. Then the satellite terminal signal receive as figure 2 shown. The angle of arrival of the target signal is θ 0 , the angle of arrival of the i-th interference signal is θ i , both noise and signal obey independent cyclic complex Gaussian distributions, namely

[0051] see image 3 , the concrete steps of a kind of spectrum sensing-based multi-feed satellite interference suppression method of the present invention are as follows:

[0052] S1. After filtering and sampling the continuous sensing data received by M receiving feeds at the multi-feed satellite receiving end, an M×L-dimensional baseb...

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Abstract

The invention discloses a multi-feed-source satellite interference suppression method based on spectrum sensing, and the method comprises the steps: a multi-feed-source satellite receiving end receiveing M pieces of continuous sensing data received by feed sources, and carrying out the filtering and sampling, and obtaining an M * L-dimensional baseband equivalent discrete time signal matrix X; judging whether an interference signal exists or not by using spectrum sensing according to the obtained baseband equivalent discrete time signal matrix X; if the interference signal exists, generating abeam forming vector [omega] by using a known target signal angle 0 and a target signal autocorrelation matrix RXX according to a linear constraint minimum variance criterion; processing the basebandequivalent discrete time signal vector X by using the beam forming vector; and completing interference suppression. The method is convenient for subsequent software processing, and can adaptively suppress the satellite complex signal on the basis of increasing a small calculated amount according to a linear constraint minimum variance criterion through design.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a multi-feed satellite interference suppression method based on spectrum sensing. Background technique [0002] With the development of communication technology, the service coverage of the ground mobile communication network has been able to extend to most land areas, but due to the influence of factors such as geography and operating costs, there are still many blind spots in the coverage area, which cannot satisfy people's real-time communication. In these areas, satellite mobile communication technology has unique advantages. Therefore, the idea of ​​space-space integration has been proposed, and the satellite mobile communication system is an effective supplement to the ground mobile communication system. At the same time, in wars and major natural disasters, the ground mobile communication system is extremely vulnerable to damage, and the satellite mobile ...

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Application Information

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IPC IPC(8): H04B7/08H04B7/0408H04B17/382H04B7/185
CPCH04B7/0408H04B7/086H04B7/18532H04B17/382
Inventor 范建存班勇罗新民张莹
Owner XI AN JIAOTONG UNIV
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