Downlink cooperative secure transmission method for star-ground hybrid communication network

Abstract

The invention discloses a downlink cooperative secure transmission method for a star-ground hybrid communication network. The method comprises the following steps: firstly constructing channel gain error models of a ground base station to a satellite legal node, a satellite eavesdropping node, and a ground base station node under non-ideal channel state information; then constructing a secure transmission problem which uses the node maximum transmission rate of the minimum signal to interference and noise ratio of the ground base station as an objective function, has the minimum signal to interference and noise ratio of the satellite legal node greater than the threshold, and uses the limited transmitting power of the base station as a constraint condition; transforming the signal to interference and noise ratio optimization problem into a semi-definite programming problem, designing an optimization algorithm to solve a ground station base beamforming vector; and finally transmitting the signal multiplied by the beamforming vector by the ground base station to achieve maximum synergistic interference to the satellite eavesdropping node. The method reduces the sensitivity of the network to channel state information errors and improves the reliability and confidentiality of the network.

Description

technical field [0001] The invention relates to the technical field of satellite-ground hybrid communication network, in particular to a downlink coordinated secure transmission method of the star-ground hybrid communication network. Background technique [0002] Due to the broadcasting characteristics of satellite communication, satellite eavesdropping nodes in the satellite-ground hybrid communication network can intercept legitimate satellite signals without sending signals, and satellite legal nodes and gateway stations cannot know the channel status information of satellite eavesdropping nodes and cannot actively interfere with them . From the perspective of information theory, physical layer security technology introduces ground cooperative jamming nodes without knowing the state information of the eavesdropping channel. It only needs to know the channel state information of the satellite's legitimate nodes, and uses the secure transmission method of cooperative jammin...

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Problems solved by technology

[0003] At present, with regard to the problem of secure transmission in satellite communication networks, the power control and beamforming schemes under the confidentiality rate constraints are usually analyzed and studied. By assuming the non-ideal channel state information of the eavesdropping nodes, a safe transmission scheme with minimum satellite transmission power is designed, and research The joint optimization method of satellite transmission power allocation and downlink beamforming constructs an optimization model with the goal of secrecy rate to

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