Half-duplex relay network secure transmission method based on time-division energy collection

Abstract

The invention discloses a half-duplex relay network secure transmission method based on time-division energy collection. The method comprises an information source, a relay and a plurality of sink nodes. All nodes are single antennas. A signal secure transmission process is finished in three time slots. In a first time slot, a relay node converts radio frequency signals sent by the information source into energy through an energy collection technology; in a second time slot, the information source sends useful information to the relay; in a third time slot, the relay broadcasts the received signals to sinks; the energy collected by the first relay is fully used for information forwarding in the third time slot, and the relay works in a half-duplex work mode in the three time slots; and the relay selects one user with the maximum received signal to noise ratio from a plurality of users, as a legal user for service, and the rest unselected users are potential eavesdropping users. According to the method, a cooperation technology and a time-division energy collection technology are combined, the received signal to noise ratio of an eavesdropping channel is reduced, and the security performance of the network is improved.

Description

technical field [0001] The invention relates to the fields of wireless communication and physical layer security, in particular to a half-duplex relay network security transmission method based on time-division energy collection. Background technique [0002] With the rapid development of network technology, the increasingly complex network structure makes the safe transmission of information more vulnerable to threats. Although methods such as high-level security protocols and encryption algorithms based on the key system can improve information security to a certain extent, they cannot overcome the adverse effects of the broadcast characteristics of wireless channels and rapidly increasing computing power on information security. Physical layer security technology ensures the security of information transmission directly from the physical layer by making full use of the complex spatial and time-varying characteristics of wireless channels. [0003] Multi-user diversity is...

AI Technical Summary

Problems solved by technology

[0004] In recent years, the research on energy harvesting technology in wireless networks has received extensive attention. For relay networks that are not convenient for large-scale use of wired energy supply, such as sensor networks, the traditional method is to use battery power, but it will cause network maintenance in the later period. The cost is high, and the battery needs to be replaced or recharged regularly

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