Signal energy synchronous transmission relay transmission method in physical layer safety communication

Abstract

The invention discloses a signal energy synchronous transmission relay transmission method in physical layer safety communication. The method comprises the following implementation steps that: 1) a source node transmits an energy signal and calculates an optimal energy collection time scale alpha<H>, and an unreliable relay node and a destination node collect energy; 2) in a first (1-alpha<H>)T / 2 time slot, the source node transmits an information signal x<s>, the destination node transits an interference signal x<z>, and the unreliable relay node receives the signals; 3) in a second (1-alpha<H>)T / 2 time slot, the unreliable relay node forwards the received mixed signals, and the destination node receives the signals; 4) the destination node performs adaptive interference cancellation for the mixed signals forwarded by the unreliable relay node, and performs information detection on the signals of which interference is cancelled. The method provided by the invention can effectively prolong network service life of a relay network, and has low implementation complexity and high transmission safety, thus, the method can be used for a physical layer safety relay collaborative 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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