Secure communication method in non-orthogonal multiple access network assisted by intelligent reflecting surface

A non-orthogonal multiple access, access network technology, applied in the field of multi-user non-orthogonal multiple access network security, can solve the problem that the user's information is easy to be obtained by eavesdroppers, the security problem is serious, and the amount of eavesdroppers is attenuated. question

Pending Publication Date: 2021-04-16
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] Due to the broadcasting and openness of wireless networks, user information is easily obtained by eavesdroppers. In non-orthogonal multiple access networks assisted by reflective surfaces, the security problem is even more serious.
The introduction of the reflective surface provides an additional reflective link, and the...

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  • Secure communication method in non-orthogonal multiple access network assisted by intelligent reflecting surface
  • Secure communication method in non-orthogonal multiple access network assisted by intelligent reflecting surface
  • Secure communication method in non-orthogonal multiple access network assisted by intelligent reflecting surface

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Embodiment Construction

[0063] For a better understanding, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0064] figure 1 In the reflector-assisted NOMA network shown, set α BI = α r,k = 2, β = -30dB, r k = 1, σ 2 =-110dBm. The base station is located at (5m, 0m, 0m), and the reflecting surface is located at (0m, 50m, 20m). Legal users are randomly distributed in a circle with (5m, 50m, 0m) as the center and a radius of 5m. At the same time, in order to measure the security performance of the network, we assume that there is an external eavesdropper, and the channel state information of the eavesdropper cannot be obtained in the legitimate network.

[0065] Such as figure 2 As shown, in the case of different reflective element numbers N on the reflective surface, the security rate and eavesdropping rate of three legitimate users are compared. Set M=4, r k = 1, P S = 30dBm. From the simulation results, it ca...

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Abstract

The invention provides a secure communication method in a non-orthogonal multiple access network assisted by an intelligent reflecting surface, and belongs to the field of multi-user non-orthogonal multiple access network security. By superposing a proper amount of artificial noise in transmitted NOMA information and jointly optimizing an IRS reflection phase, a transmitted beam vector and an artificial noise vector, the sum of transmission rates of legal users is maximized. In addition, the artificial noise signal for controlling transmission can be completely eliminated by a serial interference elimination technology at each legal user side, so that eavesdropping is effectively inhibited under the condition of not influencing legal receiving. Compared with an OMA (Orthogonal Multiple Access) scheme without artificial noise and assisted by a traditional reflecting surface, the invention has the advantages that the network security performance can be remarkably improved, and the application value is very high.

Description

technical field [0001] The invention belongs to the field of multi-user non-orthogonal multiple access (NOMA) network security, and specifically relates to a non-orthogonal multiple access network assisted by an intelligent reflector by introducing artificial noise and jointly optimizing the phase of the intelligent reflector and transmitting beam Safe communication method for vector and artificial noise vector. Background technique [0002] In recent years, with the rapid development of metamaterials and microelectronic systems, reconfigurable and programmable metasurfaces have emerged and been widely used. Intelligent Reflecting Surface (IRS) is a two-dimensional metasurface composed of a large number of passive and reconfigurable reflective elements, which can adjust the direction and intensity of reflected electromagnetic waves by adjusting the coefficient of reflective elements through the control circuit. Reflective surfaces can be flexibly deployed, for example, on t...

Claims

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Application Information

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IPC IPC(8): H04W24/06H04W24/02
CPCY02D30/70
Inventor 王蔚赵楠邹德岳刘鑫
Owner DALIAN UNIV OF TECH
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