A unidirectional full-duplex mimo relay antenna selection secure transmission method

Abstract

A method for selecting safe transmission of one-way full-duplex MIMO relay antenna is disclosed. The full-dual MIMO relay system comprises a source, a relay, a destination node and an eavesdropper. The source, the relay, the destination node and the eavesdropper are configured with multiple antennas. The transmission of information is completed in one time slot, comprising the following steps: acquiring the number of transmitting antennas of the source and the number of receiving antennas of the relay; obtaining the number of transmit antennas for the relay; based on the number of transmittingantennas of the source, the number of receiving antennas of the relay and the number of transmitting antennas of the relay, obtaining the reception signal-to-noise ratio of the destination and the reception signal-to-interference-noise ratio of the eavesdropper; obtaining the instantaneous safety capacity of the full-duplex MIMO relay system based on the received signal-to-noise ratio of the destination and the received signal-to-interference-noise ratio of the eavesdropper. By selecting the optimal transmitting and receiving antennas, the method of the invention not only optimizes the signal-to-noise ratio of the relay reception, but also takes into account the weakening of the signal-to-interference-to-noise ratio of the eavesdropper reception, thereby effectively improving the safety capacity of the whole system.

Description

technical field [0001] The invention relates to the field of wireless communication and physical layer security, in particular to a one-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 inform...

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Problems solved by technology

[0005] However, the existing research rarely combines the two technologies. Usually, the relay cooperative communication technology or the antenna selection technology is used unilaterally, which can only improve the security performance of the system to a limited extent. For example, there is no relay model in literature [9], and the antenna selection scheme Only considering the antenna selection of the multi-antenna sending node and multi-antenna receiving node, although the receiving signal-to-noise ratio of the destination is improved, the receiving signal-to-interference-noise ratio of the eavesdropper has no effect, and the security performance of the entire system is limited.

In order to improve the security performance of the system, the traditional relay cooperative communication technology often sends artificial noise to interfere with eavesdroppers. Usually, a precoding scheme is used, which makes the system complex and cumbersome to operate. For example, literature [6] uses the artificial noise precoding scheme to pass the middle Although sending artificial noise to interfere with eavesdroppers can improve system security performance, compared with the antenna selection scheme, the system complexity is high and it is inconvenient to analyze; traditional antenna technologies such as beamforming technology, such as the beamforming scheme in [5], By weighting and combining the signals received by the multi-antenna relay to form the required ideal signal, although the system performance can be improved, compared with the antenna selection scheme, the system requires a strong signal processing capability, which will greatly increase the equipment cost. and power consumption, these defects have brought challenges to improve the performance of communication systems

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