Signal energy simultaneous interpretation relay transmission method in physical layer security communication

Abstract

The invention discloses a relay transmission method for simultaneous transmission of information and energy in physical layer security communication. The implementation steps are as follows: 1) a source node sends an energy signal, an unreliable relay node and a destination node collect energy, and calculate the optimal energy Collection time ratio αH; 2) In the first (1‑αH)T / 2 time slot, the source node sends the information signal xs, the destination node sends the interference signal xz, and the unreliable relay node receives the signal; 3) In the second In a (1-αH)T / 2 time slot, the unreliable relay node forwards the received mixed signal, and the destination node receives the signal; 4) the destination node performs self-interference cancellation on the mixed signal forwarded by the unreliable relay node, and Information detection is performed on the signal after the interference is eliminated. The invention can effectively prolong the network service life of the relay network, has low implementation complexity and high transmission security, and can be used in a physical layer secure relay cooperative communication system.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a relay transmission method for signal energy simultaneous interpretation in physical layer security communication. Background technique [0002] Due to the broadcast nature of wireless transmission, information transmission faces the risk of being eavesdropped by unauthorized eavesdropping nodes. Traditional encryption technology guarantees the security of information transmission through the generation and interaction of high-level keys in the network. However, this is usually based on the premise that the computing power of the nodes is limited, and the system complexity and signaling overhead are relatively large. According to information theory, physical layer security communication makes full use of the physical layer characteristics of wireless channels, so that the eavesdropping nodes can not obtain effective information, and the legitimate nodes can successfully re...

AI Technical Summary

Problems solved by technology

The disadvantages of this technical solution are: firstly, this method uses iterative reorganization to select two modes of relay amplification and forwarding and noise forwarding, and its computational complexity is relatively high; secondly, this method uses multiple In succession mode, its power consumption is large and the utilization rate of energy resources is low, which is not conducive to the realization of

The shortcomings of this method are: firstly, the relay node of this method needs channel estimation in each transmission period, and the transmission of signaling information brings additional energy overhead to the relay system; secondly, this method adopts the variable optimal Power split ratio ρ * and 1-ρ * , so that the power amplifier of the relay node works in a larger linear power amplification range, the circuit design complexity is high, and it is not easy to implement

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