Cooperative relay security transmission method based on artificial noise interference

Abstract

The invention discloses a cooperative relay security transmission method based on artificial noise interference, wherein the whole transmission process is completed in two time slots; in the first time slot, an information source broadcasts available information fused with artificial noise to a relay and an eavesdropper, and before broadcasting, the artificial noise is pre-coded by a null space orthogonal base of a channel from the information source to the relay, and the available information is pre-coded by using a maximal ratio transmission strategy; and in the second time slot, the relay decodes and transmits the received information, and meanwhile the information source sends the artificial noise to interfere the receiving of the eavesdropper. According to the cooperative relay security transmission method based on artificial noise interference, as interferences are implemented in both the two transmission time slots for the eavesdropper, the reception signal-to-interference-and-noise-ratio of the eavesdropper can be effectively reduced, thereby the system security performance is enhanced, and the security transmission of the information is ensured; in addition, in order to improve the use ratio of the system power, the power can be set through working out the optimal power distribution factor of the system, and thereby the optimal system security performance can be achieved with the lowest power consumption.

Description

technical field [0001] The invention relates to the fields of wireless communication and physical layer security, in particular to a method for secure transmission of coordinated relay based on artificial noise scrambling. Background technique [0002] In recent years, due to the rapid popularization of mobile Internet, the performance requirements and service quality of wireless communication networks have been further improved. Due to the advantages of improving network capacity, signal coverage and transmission power utilization, cooperative relay has attracted much attention as a key technology for future wireless communication networks. However, the number of nodes in the cooperative relay system is large, the network structure is complex, and the openness is strong, which makes the security problem more complicated. Moreover, due to the current rapidly increasing computing power and the broadcast characteristics of wireless channels that may cause eavesdroppers to eav...

AI Technical Summary

Problems solved by technology

In a more practical cooperative relay communication scenario with passive eavesdropping nodes, it is usually difficult for the sender to obtain complete eavesdropper channel state information, and it is impossible to use technologies such as cooperative beamforming based on eavesdropper channel state information to improve system security performance

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