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A design method of terahertz communication system assisted by intelligent reflective surface

A reflective surface, communication system technology, applied in transmission systems, wireless communication, radio transmission systems, etc., can solve the problems of traversal search algorithm consumption, high computational complexity, etc., to reduce complexity and meet the requirements of data transmission rate. Effect

Active Publication Date: 2021-06-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Description
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Problems solved by technology

But the traversal search algorithm consumes extremely high computational complexity

Method used

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  • A design method of terahertz communication system assisted by intelligent reflective surface
  • A design method of terahertz communication system assisted by intelligent reflective surface
  • A design method of terahertz communication system assisted by intelligent reflective surface

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Experimental program
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Effect test

Embodiment

[0117] In this embodiment, a Matlab simulation platform is used for experiments.

[0118] The purpose of this example is achieved through the following steps:

[0119] S1. Setting the parameters of the terahertz MIMO system supported by the IRS. 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 mobile client antennas N MS =4, the number of IRS arrays N IRS =32, discrete phase set Channel H 1 and H 2 geometric channel model

[0120]

[0121] 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

[0122]

[0123] 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 2 The expression of can refer to H 1 . In addition, set the signal-to-noise ratio SNR = ρ / δ 2 ∈[-40,0]dB, the number of data streams transmitted by the base station N s =...

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Abstract

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 reflective surface. The solution of the present invention is that the communication system includes an N BS base station with antennas, by N IRS An intelligent reflective surface composed of reflective array elements and equipped with N MS The base station sends the signal to the mobile user end through the intelligent reflective surface. The present invention aims at maximizing the downlink transmission data rate, establishes a joint optimization function, and optimizes the maximum transmission data rate of the system through the gradient descent method. question. Compared with the traditional technology, the solution of the present invention can greatly reduce the complexity of the IRS phase search. In each iteration process, by selecting the size of the Taylor expansion adaptive calculation step size, the terahertz communication system assisted by the intelligent reflective surface can In the downlink, the optimal data transmission rate is achieved by approaching the ergodic search algorithm.

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, IRS has been proposed by academia and industry, and it can effectively improve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W16/18H04W24/02H04B7/0413
CPCH04B7/0413H04W16/18H04W24/02
Inventor 陈文杰陈智马新迎
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA