Bidirectional and duplex MIMO (Multiple Input Multiple Output) relay antenna selection and safety transmission method

Abstract

The invention discloses a bidirectional and duplex MIMO (Multiple Input Multiple Output) relay antenna selection and safety transmission method. A duplex MIMO relay system comprises a user A, a user B, a relay and an eavesdropper, wherein the user A, the user B, the relay R and the eavesdropper E are provided with a plurality of antennas; the method comprises the following steps: acquiring a transmitting antenna of the user A, a transmitting antenna of the user B and a receiving antenna of the relay; acquiring a receiving antenna of the user A, a receiving antenna of the user B and a transmitting antenna of the relay; acquiring a receiving signal-to-noise ratio of the user A, a receiving signal-to-noise ratio of the user B and a receiving signal-to-noise ratio of the eavesdropper E based on the transmitting antenna and the receiving antenna of the user A, the transmitting antenna and the receiving antenna of the user B and the receiving antenna and the transmitting antenna of the relay; acquiring an instantaneous safety capacity of the duplex MIMO relay system based on the receiving signal-to-noise ratio of the user A, the receiving signal-to-noise ratio of the user B and the receiving signal-to-noise ratio of the eavesdropper E. According to the bidirectional and duplex MIMO relay antenna selection and safety transmission method, optimal transmitting and receiving antennas areselected and the safety capacity of the whole system can be effectively improved.

Description

technical field [0001] The invention relates to the fields of wireless communication and physical layer security, in particular to a two-way full-duplex MIMO (multiple-input multiple-output) relay antenna selection security transmission method. Background technique [0002] In the course of the development of wireless communication technology, various security communication technologies have also developed accordingly. The physical layer security is based on Shannon's theory of channel coding technology, which uses the complex spatial characteristics and time-varying characteristics of wireless channels to realize the secure transmission of information. Wyner originally proposed the concept of physical layer security and its related indicators [1] . Subsequently, the physical layer security technology developed rapidly, especially the relay cooperative communication technology and antenna selection technology are increasingly used to ensure the secure transmission of infor...

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Problems solved by technology

[0005] However, the existing research rarely combines the two technologies. Usually, the two-way relay cooperative communication technology or the antenna selection technology is used unilaterally, especially the antenna selection technology, which is rarely used. These can only improve the security performance of the system to a limited extent.

In order to improve the security performance of the system, the traditional two-way relay cooperative communication technology often sends artificial noise to interfere with eavesdroppers, and usually uses a precoding method. For example, in the literature [7], multi-antenna dual sources interfere with multiple antennas by emitting artificial noise Although the untrusted relay increases the average security rate of the system, compared with the antenna selection method, the system complexity is high and the operation is cumbersome; traditional antenna technologies such as beamforming technology, such as the multi-antenna two-way In the trusted relay system, the relay uses beamforming technology to maximize the system security rate by optimizing the beamforming matrix. Although the system performance can be improved, compared with the antenna selection method, the system requires the system to have a strong signal processing capability. Greatly increase the cost and power consumption of equipment, these defects have brought challenges to improve the performance of the communication system

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