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A Multi-feed Satellite Interference Suppression Method Based on Spectrum Sensing

A multi-feed satellite and interference suppression technology, which is applied in the field of communication, can solve the problems of weak, time-varying, and complex signals at the satellite receiving end, and achieve the effects of reducing the number of beamforming times, improving the signal-to-interference-noise ratio, and reducing the amount of calculation

Active Publication Date: 2021-05-28
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

Method used

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  • A Multi-feed Satellite Interference Suppression Method Based on Spectrum Sensing
  • A Multi-feed Satellite Interference Suppression Method Based on Spectrum Sensing
  • A Multi-feed 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. The continuous sensing data received by M receiving feed sources at the multi-feed source satellite receiving end is filtered and sampled to obtain M×L-dimensional baseband equivalent Discrete-time signal matrix X; use spectrum sensing to determine whether the interference signal exists according to the obtained baseband equivalent discrete-time signal matrix X; if the interference signal exists, use the known target signal angle θ according to the linearly constrained minimum variance criterion 0 and the target signal autocorrelation matrix R XX Generate a beamforming vector ω; use the beamforming vector to process the baseband equivalent discrete-time signal vector X; complete interference suppression. The invention is convenient for subsequent software processing, and can self-adaptively suppress satellite complex signals by designing the minimum variance criterion based on linear constraints and adding less calculation amount.

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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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