A Downlink Collaborative Secure Transmission Method for Satellite-Ground Hybrid Communication Network

Abstract

The invention discloses a downlink coordinated secure transmission method of a satellite-ground hybrid communication network. The method is as follows: first construct the channel gain error model from the ground base station to the satellite legal node, the satellite eavesdropping node, and the ground base station node under the non-ideal channel state information; then use the channel gain error model as a sample reflecting the non-ideal channel state information, Construct the security transmission problem with the node transmission rate maximization of the minimum signal-to-interference-noise ratio of the ground base station as the objective function, the minimum signal-to-interference-noise ratio of the satellite legal node is greater than the threshold value, and the base station transmission power is limited as the constraint conditions; then the signal-to-interference The noise ratio optimization problem is transformed into a semi-positive definite programming problem, and an optimization algorithm is designed to solve it to obtain the beamforming vector of the ground base station; finally, the signal sent by the ground base station is multiplied by the beamforming vector to achieve the maximum cooperative interference to the satellite eavesdropping nodes. The invention 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 obtain the beamforming weight vector, but it does not consider the introduction of ground cooperative interference method; about the secure transmission in the satellite-ground hybrid communication network problem, the optimization solves the outage probability and secrecy rate under ground interference, but does not consider the problem of non-ideal channel state information

Therefore, the existing method is not suitable for the secure transmission scenario of downlink non-ideal channel state information in the satellite-ground hybrid communication network

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