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Intelligent reflection surface assisted terahertz safety communication system design method

A reflective surface, system design technology, applied in security devices, transmission systems, wireless communications, etc., can solve the problems of traversal search algorithm consumption, high computational complexity, etc., to achieve easy implementation, low computational complexity, and improved security rates. Effect

Active Publication Date: 2020-06-30
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

One of the most direct adjustment methods is to use the traversal search algorithm to find the maximum security rate by traversing and comparing the possible phase combinations of all array elements on the smart reflective surface, but the traversal search algorithm consumes extremely high computational complexity

Method used

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  • Intelligent reflection surface assisted terahertz safety communication system design method
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  • Intelligent reflection surface assisted terahertz safety communication system design method

Examples

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Embodiment

[0079] In this embodiment, a Matlab simulation platform is used for experiments.

[0080] The purpose of this example is achieved through the following steps:

[0081] S1. Setting parameters of a terahertz multi-input single-output secure communication system assisted by an intelligent reflective surface. The system parameters in this example are as follows: frequency band f=0.22THz, number of base station antennas N BS =128, the number of intelligent reflective surface arrays N IRS =32, discrete phase set Channel H t 、h ru 、h re 、h du 、h de geometric channel model

[0082]

[0083] Among them, the number of paths L=3, the path gain physical angle θ IRS and θ BS Uniformly distributed in [0,2π]. array response vector

[0084]

[0085] where d=λ / 2=c / (2f), c=3×10 8 m / s. The expressions of other array responses can refer to a(θ BS ), channel h ru 、h re 、h du 、h de The expression of can refer to H t . In addition, set the signal-to-noise ratio SNR = ρ / ...

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Abstract

The invention belongs to the technical field of high-frequency wireless communication, and particularly relates to an intelligent reflection surface assisted terahertz communication system design method. The scheme of the invention is as follows: the communication system comprises a base station equipped with NBS antennas, an intelligent reflection surface formed by NIRS reflection array elements,and a mobile user terminal equipped with a single antenna. Through active hybrid beam forming, the base station transmits a transmitting signal to a relay formed by the intelligent reflection indicator in a wave beam form; and the intelligent reflection surface reflects the wave beam to a mobile user side by adjusting the phase of each array element, suppresses a received signal of an eavesdropper, establishes a joint optimization function by taking maximization of a downlink transmission data rate as a target, and optimizes the problem of maximization of a system transmission data rate through a phase search algorithm based on cross entropy. Compared with the traditional technology, the search frequency and the calculation complexity of the intelligent reflection surface phase matrix canbe effectively reduced, and meanwhile, the safety rate of the multi-input single-output terahertz communication system can be improved.

Description

technical field [0001] The invention belongs to the technical field of high-frequency wireless communication, and in particular relates to a design method of a terahertz communication system assisted by an intelligent reflecting surface (Intelligent Reflecting Surface, IRS). Background technique [0002] With the rapid development of wireless communication technology, academia and industry are paying more and more attention to the mining and utilization of high-band spectrum resources (such as: terahertz). Terahertz communication faces some challenges in practical applications: due to severe path attenuation and molecular absorption loss, terahertz communication is limited to short-distance indoor scenarios; however, due to the strong directionality and poor diffraction of terahertz waves, terahertz waves are prone to By indoor obstacles (such as furniture, walls). In order to solve this problem, smart reflective surfaces have been proposed by academia and industry, which c...

Claims

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Application Information

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IPC IPC(8): H04B7/0456H04B7/06H04B7/145H04W12/12
CPCH04B7/0456H04B7/0617H04B7/145H04W12/122H01Q15/148H01Q1/246H04B7/04013H04L63/0428
Inventor 陈文杰陈智马新迎
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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