A full-duplex scrambling transmission method in an untrusted relay network

Abstract

The invention discloses a full duplex scrambling transmission method in an untrusted relay network, which is applied to a wireless communication system including three nodes of an information source, a relay and a destination node, and the relay is an untrusted relay. The method comprises the following steps: in a first time slot, transmitting information to the relay and the destination node by the information source, and receiving information source information by the destination node and transmitting an interference signal to the relay; in a second time slot, amplifying the signal received in the first time slot by the relay by adopting an amplify-and-forward protocol, after that, forwarding the signal to the destination node; performing self-interference cancellation by the destination node according to estimated channel information, and performing maximal-ratio combining on information received in the first time slot and the second time slot; and calculating the instantaneous security capacity of the system according to the received signal to noise of the relay in the first time slot and the received signal to noise of the destination node in the two time slots. The method of the invention can not only make the information source send the information to the destination node efficiently, but also make the destination node effectively interfere with the relay node to receive useful information, so as to maximize the security capacity of the system.

Description

technical field [0001] The invention relates to the fields of wireless communication and physical layer security, in particular to a full-duplex scrambling transmission method in an untrusted relay network. The invention relates to the field of wireless communication physical layer security and cooperative communication, in particular to a transmission method based on full-duplex destination scrambling untrusted relay under cooperative interference. 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 securit...

AI Technical Summary

Problems solved by technology

However, when the relay is an untrusted relay, it has a great impact on the security performance of the system

When the untrusted relay uses the decoding and forwarding protocol to transmit, the relay node will receive more accurate information than the destination end, which will result in the inability to obtain the positive security capacity of the system

Therefore, the untrusted relay communication system generally uses the amplification and forwarding protocol for information forwarding, but the security capacity of the system will not be greatly improved

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