Full duplex multi-antenna destination node interference transmission method based on optimum antenna selection

Abstract

The invention discloses a full duplex multi-antenna destination node interference transmission method based on optimum antenna selection. The method comprises the steps that a destination end estimates a channel according to pilot information, thereby obtaining channel state information; the destination end selects a group of transceiving antennas with the maximum secure capacity from N antennas configured to the destination end through utilization of the channel state information; in a first time slot, an information source sends information to a relay and the destination end, and the destination end receives the information of the information source and moreover sends an interference signal to the relay; in a second time slot, the relay amplifies the signal received in the first time slot through adoption of an amplification and forwarding protocol and then forwards the amplified signal to the destination end, and the destination end carries out self-interference elimination; the destination end carries out maximal-ratio combination on the information received in the first time slot and the second time slot and calculates the secure capacity; and an optimum power allocation factor is obtained according to the secure capacity. According to the method, the full duplex multi-antenna destination node interference and antenna selection methods are combined, and through selection, the system can obtain the optimum transceiving antenna pairs with the maximum secure rates.

Description

technical field [0001] The present invention relates to the field of wireless communication and physical layer security, in particular to a full-duplex multi-antenna destination node interference transmission method based on optimal antenna selection. Background technique [0002] With the rapid development of network technology, the increasingly complex network structure makes the secure transmission of information more vulnerable to threats. Although methods such as high-level security protocols and encryption algorithms based on key systems 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. The 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...

AI Technical Summary

Problems solved by technology

However, when the relay is an untrusted relay, it has a very large 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 node, 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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