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

A physical layer security and two-way relay technology, applied in the field of wireless physical layer security transmission, can solve the problem of untrustworthy relay itself, achieve the effect of resisting eavesdropping, ensuring safe transmission, and low resource consumption

Active Publication Date: 2015-12-16
XI AN JIAOTONG UNIV
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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

Method used

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

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[0031] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0032] refer to figure 1 , the wireless physical layer security transmission method assisted by constellation rotation in the bidirectional relay system of the present invention comprises the following steps:

[0033] 1) Estimating channel information, user node A and user node B select symbols carrying information from the rotated constellation, then construct a composite signal by injecting artificial noise, and then perform phase pre-compensation on the composite signal according to the estimated channel information, Get the composite signal S to be sent by user node A A and the composite signal S to be sent by the user node B B , the user node A and the user node B simultaneously transmit the composite signal S to be sent with the transmit power P, respectively. A and the composite signal S to be sent B forward to relay;

[0034] 2) The relay receives the sig...

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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...

Claims

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Application Information

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IPC IPC(8): H04W12/02H04L5/14H04B7/185
CPCH04B7/18565H04L5/14H04W12/02
Inventor 孙黎徐洪斌任品毅杜清河
Owner XI AN JIAOTONG UNIV
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