Satellite-ground fusion cooperative communication physical layer secure transmission method based on friendly interference

Abstract

The invention discloses a satellite-ground fusion cooperative communication physical layer secure transmission method based on friendly interference, and the method comprises the steps of calculatingthe output signal-to-noise ratio of a satellite to each ground fixed node according to a satellite signal received by each ground fixed node; enabling the ground fixed nodes of which the output signalto noise ratios are greater than a decoding threshold to form a relay node set used for decoding and forwarding the satellite signals; and enabling ground fixed nodes of which the output signal to noise ratios are smaller than the decoding threshold to form an interference node set used for sending the friendly interference to a ground eavesdropper so as to realize the safe transmission of the satellite information. Under the condition that the instantaneous information of a legal user link channel and the statistical information of an eavesdropper link channel are known, a virtual array formed by the relay node set and the interference node set is subjected to beamforming design, so that the maximum system security capacity is obtained. Compared with an existing relay selection method, the method has the advantage that the physical layer safety transmission performance of a satellite-ground fusion cooperative communication system can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication physical layer security, in particular to a physical layer security transmission method of satellite-ground fusion cooperative communication based on friendly interference. Background technique [0002] Satellite systems have attracted great attention due to their wide application in many fields such as broadcasting, navigation, national defense, rescue and disaster relief. However, obstructions present on the direct link between the satellite and ground users can cause shadowing effects. The shadowing effect is especially severe when the satellite elevation angle is low or when the user is indoors. [0003] To solve this problem, a satellite-ground integrated cooperative communication system is proposed in the prior art. In this system, the ground terminal receives the satellite signal through the ground relay node, and the inherent broadcast nature of wireless communication make...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and propose a physical layer security transmission method of satellite-ground fusion cooperative communication based on friendly interference, which solves the poor physical layer security performance existing in the existing relay selection method The problem

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