Method for improving security rate of untrusted relay carrier communication system

Abstract

The invention belongs to the technical field of information security, and discloses a method for improving security rate of an untrusted relay carrier communication system. The method comprises the following steps: constructing a model of a two-hop two-way relay network during the communication process; calculating a signal forwarded by the relay of a first time slot and the energy collected thereby; calculating the signals received by two sources in a second time slot and the signal-to-noise ratio and channel capacity thereof; calculating the instantaneous signal-to-noise ratio and corresponding channel capacity obtained by the two sources when eavesdropping the relay; calculating the security speed of the two sources to the channel of the relay; optimizing the security rate to find the best transmitted power of the two sources A and B and the proportional coefficient pi of the energy collected by the relay. The method is superior to equal power allocation, can make the reliability ofthe security rate be optimal, and is suitable for untrusted selfish relays.

Description

technical field [0001] The invention belongs to the technical field of information security, and in particular relates to a method for improving the security rate of an untrusted relay energy-carrying communication system. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: due to the ability to achieve hierarchical gain and expand the coverage of wireless networks, relay-assisted cooperative transmission has become a major research hotspot in recent years. However, the general research assumes that the relay is trustworthy. In practice, due to the complexity of the network structure and the additive interference in the transmission, the security of the relay is lower than that of the signal source. Relays may actually be eavesdroppers or malicious relays. This brings certain hidden dangers to secure communication. It is very necessary to improve the security of physical layer in eavesdropping relay. Under the...

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Problems solved by technology

[0005] (2) Prior art 2 considers a one-way relay system, and a two-way system has a more complex structure than a one-way system, and the expression of channel capacity and security capacity is complicated, so this technology is not suitable for a two-way system

[0008] Different from the one-way relay system, in the two-way relay system, two one-way communications are carried out in one channel at the same time, and the expression of channel capacity and safety capacity is complicated, which increases the difficulty of solving the optimization problem

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