Full duplex cognitive multiple-input-multiple-output relay cooperation method in non-ideal channel state

Abstract

The invention discloses a full duplex cognitive multiple-input-multiple-output relay cooperation method in a non-ideal channel state, and belongs to the technical field of multi-antenna full duplex wireless transmission. Firstly, according to a channel estimation model in a first time slot non-ideal channel state, a secondary user transmitter selects and configures an optimal antenna to send a signal to a secondary user relay node under a primary user interference temperature constraint condition, and a full duplex destination node transmits a directional interference signal to an eavesdropping user in a zero-forcing beamforming mode; then, according to a channel estimation model in a second time slot non-ideal channel state; and the secondary user relay node forwards data to the full-duplex destination node under the constraint condition of the interference temperature of the primary user, any LB antenna in the full-duplex destination node receives signals, and the remaining NB-LB antenna of the full-duplex destination node transmits artificial interference to an eavesdropping user. According to the method, the physical layer security transmission performance of the full duplex cognitive wiretapping network under the non-ideal channel is effectively improved, and the risk that the whole network system is wiretapped is reduced.

Description

technical field [0001] The invention belongs to the technical field of multi-antenna full-duplex wireless transmission, and in particular relates to a full-duplex cognitive multi-input multi-output relay cooperation method under a non-ideal channel state. Background technique [0002] In recent years, with the increasing shortage and waste of spectrum resources, cognitive radio technology has emerged. The emergence of cognitive radio can effectively alleviate the problem of spectrum resource shortage. Among them, the shared spectrum resource under the interference temperature constraint is mainly that the secondary users share the spectrum resource of the primary user without affecting the service quality of the primary user. Then, the frequent interaction of spectrum resources will inevitably lead to information security issues, and physical layer security technology, as an anti-eavesdropping transmission technology, has attracted the attention of scholars. [0003] In fac...

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Problems solved by technology

[0005] Technical problem: In view of the existing problems of poor security performance and high risk of eavesdropping during the transmission process of the physical layer of the full-duplex cognitive eavesdropping network under the non-ideal channel state, the present invention p...

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