Secure transmission method adopting information source and relay-combined transmitting antenna selection

Abstract

The invention relates to a secure transmission method adopting information source and relay-combined transmitting antenna selection. The method includes the following steps that: in a first time slot, and an information source obtains channel state information from a relay and selects an antenna which makes the received signal to noise of the relay maximum to broadcast confidential signals according to the channel state information, and other three nodes receive signals through adopting maximal-ratio combining; in a second time slot, the relay adaptively decodes a forwarding protocol, when the relay can correctly decode the forwarding protocol, the relay obtains channel state information from an information sink and selects one antenna which makes the received signal to noise of the information sink maximum to forward confidential signals according to the channel state information from the information sink; and when the relay cannot correctly decode the forwarding protocol, the information source obtains the channel state information from the information sink and selects an antenna which makes the received signal to noise of the information sink maximum to retransmit the confidential signals in the first time slot, and the information sink and the relay receive the signals with maximal-ratio combining. According to the method of the invention, transmitting antenna selection technology is adopted to maximize the received signal to noise ratio of the relay or the information sink, and the received signal to noise ratio of an eavesdropper can be decreased, and low complexity and high security can be achieved.

Description

technical field [0001] The invention relates to the fields of wireless communication and physical layer security, in particular to a safe transmission method for information source relay joint transmission antenna selection. Background technique [0002] In recent years, with the rapid popularization of high-speed wireless networks and the rapid development of cloud computing, traditional encryption technologies that rely on complex mathematical algorithms may face difficulties in the more open wireless communication process, and the security of wireless transmission is facing great challenges. In order to ensure the secure transmission of the network, the physical layer security technology that makes full use of the physical characteristics of wireless communication networks (such as spatial characteristics and time-varying characteristics) has become a research hotspot. The early research content of the physical layer security technology mainly involves the information sou...

AI Technical Summary

Problems solved by technology

Although some people have used the transmit antenna selection technology in the cooperative relay network, the scheme is designed in the case that there is no eavesdropper or there is no direct path from the source to the sink.

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