Robust wireless energy-carrying relay cooperation security communication method

Abstract

The invention discloses a robust wireless energy-carrying relay cooperative secure communication method, which comprises the following steps of: constructing a wireless sensor network system model of wireless energy-carrying relay cooperation, and subtracting the channel capacity of the strongest eavesdropper from the channel capacity of a legal receiving end to obtain a system secrecy rate; and converting the solving process into a problem of maximizing the secrecy rate under the worst condition, and efficiently solving the problem through an iterative optimization algorithm to obtain a vector and a relay power distribution factor. According to the method, a problem is modeled into a maximum and minimum problem, a slack variable is introduced, the problem is converted into an upper-layer problem and a lower-layer problem, and the upper-layer problem is converted into a standard convex problem through conversion in a fractional quadratic programming form; and an iterative algorithm is designed to solve the two problems at the same time so as to obtain the optimal beam forming vector at the relay. And then an optimal power distribution factor of the relay is obtained by using one-dimensional search. According to the method, the secrecy rate when the relay cannot acquire perfect channel state information of an eavesdropper can be remarkably improved.

Description

[0001] The invention relates to the technical field of wireless sensor network communication, in particular to a robust wireless energy-carrying relay cooperative safety communication method. Background technique [0002] With the advancement of wireless communication technology, wireless sensor network (WSN) technology has been fully developed, and a large number of wireless sensors have been put into use. Due to the size limitation of wireless sensors, they can only be equipped with a single antenna, and cannot use multiple-input multiple-output (MIMO) technology. Beamforming obtains spatial gain for better transmission performance. However, there are often a large number of nodes in the Internet of Things. Using these nodes, relay cooperation technology can provide a feasible solution to the above problems, that is, use other nodes in the Internet of Things to act as relays for cooperative information transmission to obtain good results. Space diversity gain. However, coop...

AI Technical Summary

Problems solved by technology

It solves the problem of severe system performance degradation caused by not considering the eavesdropper and failing to obtain the perfect channel state information relayed to the eavesdropper in the prior art

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