Constellation rotation assisted wireless physical layer secure transmission method in two-way relay system

Abstract

The invention discloses a constellation rotation assisted wireless physical layer secure transmission method in a two-way relay system. The constellation rotation assisted wireless physical layer secure transmission method comprises: 1) channel information is established, a user node A and a user node B select symbols carrying information from a rotated constellation, inject manual noise to construct a composite signal, carry out phase pre-compensation on the composite signal according to the estimated channel information to obtain a composite signal SA to be sent by the user node A and a composite signal SB to be sent by the user node B, and meanwhile respectively send the composite signal SA to be sent and the composite signal SB to be sent at transmitting power P; 2) a relay receives the signals sent by the user node A and the user node B to obtain a mixed signal yB; 3) the relay amplifies the obtained mixed signal and broadcasts the mixed signal to the user node A and the user node B; and 4) the user node A and the user node B detect the mixed signal. The constellation rotation assisted wireless physical layer secure transmission method disclosed by the invention can be used for effectively resisting the eavesdropping behavior of incredible relays.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a wireless physical layer security transmission method assisted by constellation rotation in a two-way relay system. Background technique [0002] In the past few years, two-way cooperative networks have received extensive attention due to the advantages of high spectral efficiency. However, most of the existing works only focus on techniques to enhance communication reliability, such as network coding, relay routing, and beamforming design, etc., and rarely address security issues in two-way relay systems from the perspective of the physical layer. [0003] At present, the research on the untrusted relay problem in the two-way relay system mainly involves the achievable privacy rate in the Gaussian eavesdropping channel, the selection strategy of cooperative relay and jammer, and the joint design of beamforming and artificial noise, etc. Most of these schemes It is...

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Problems solved by technology

However, most of the existing work only focuses on techniques to enhance communication reliability, such as network coding, relay routing, and beamforming design, etc., and rarely addresses security issues in two-way relay systems from the perspective of the physical layer.

[0003] At present, the research on the untrusted relay problem in the two-way relay system mainly involves the achievable privacy rate in the Gaussian eavesdropping channel, the selection strategy of cooperative relay and jammer, and the joint design of beamforming and artificial noise. It is assumed that the eavesdropper is an independent individual outside the network. However, in some application scenarios, the relay itself may not be trusted. It is not only a facilitator of the communication process, but also a potential eavesdropper.

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