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Channel estimation method and system based on positioning information assistance in RIS system in Internet of Vehicles environment

A technology of channel estimation and positioning information, applied in the field of channel estimation, can solve the problem that it is difficult to meet the dynamics of time-varying channel wireless networks, and achieve the effect of reducing time complexity and improving signal power

Active Publication Date: 2021-08-20
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because traditional reflective surfaces only have fixed phase shifters after manufacture, which is difficult to meet the dynamic requirements of time-varying channel wireless networks.

Method used

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  • Channel estimation method and system based on positioning information assistance in RIS system in Internet of Vehicles environment
  • Channel estimation method and system based on positioning information assistance in RIS system in Internet of Vehicles environment
  • Channel estimation method and system based on positioning information assistance in RIS system in Internet of Vehicles environment

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Experimental program
Comparison scheme
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Embodiment 1

[0101] In this embodiment, a channel estimation method based on positioning information assistance in a RIS system in an Internet of Vehicles environment, taking the UPA design of RIS as an example, specifically includes the following steps:

[0102] Step 1: Obtain the relative position information of the object in the communication based on the Internet of Vehicles system, first initialize the relative position of the sending end, the intelligent reflective surface and the receiving end, and set

[0103] BS:(x 1 ,y 1 ,z 1 )

[0104] RIS:(x 2 ,y 2 ,z 2 )

[0105] User:(x 3 ,y 3 ,z 3 )

[0106] Wherein, the set coordinates are the center point positions of the corresponding communication devices.

[0107] Step 2: According to the obtained base station, RIS and the relative position of the receiving end, the azimuth and elevation angles of the BS can be obtained as follows:

[0108]

[0109]

[0110] The azimuth and elevation angles of the RIS received signal a...

Embodiment 2

[0138] Such as figure 1 As shown, in the present embodiment, a channel estimation system based on positioning information assistance in a RIS system under an Internet of Vehicles environment, specifically includes the following modules:

[0139] Relative position acquisition module: Obtain the relative position information of objects in communication based on the Internet of Vehicles system, first initialize the relative positions of the sending end, the intelligent reflective surface and the receiving end, and set

[0140] BS:(x 1 ,y 1 ,z 1 )

[0141] RIS:(x 2 ,y 2 ,z 2 )

[0142] User:(x 3 ,y 3 ,z 3 )

[0143] Wherein, the set coordinates are the center point positions of the corresponding communication devices.

[0144] Azimuth angle and elevation angle calculation module: According to the obtained relative positions of the base station, RIS and receiving end, the azimuth angle and elevation angle of the BS can be calculated as follows:

[0145]

[0146] ...

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Abstract

The invention discloses a channel estimation method and system based on positioning information assistance in an RIS system in an Internet of Vehicles environment. The method comprises the following steps: 1, obtaining relative positions of a base station, an RIS and a vehicle receiving end according to the Internet of Vehicles; 2, according to the relative positions, acquiring the azimuth angles and elevation angles of effective signals from the base station to the RIS and from the RIS to the receiving end in the propagation process; 3, according to azimuth angles and elevation angles of received signals and reflected signals of the RIS, constructing a cascade channel G from the base station to the RIS and cascade channels hr, k from the RIS to a receiving end; 4, considering downlink pilot frequency transmission, constructing a channel model, receiving signal conversion by a single-user receiving end, and constructing a cascade channel; 5, calculating an optimal reflection coefficient of each unit of the RIS by using position information based on a criterion of maximum receiving signal power of the receiving end, and constructing a reflection coefficient matrix [Theta]; and step 6, according to the obtained reflection coefficient matrix [Theta] and the single-user receiving signal yk, obtaining an estimation channel Hc through an LS algorithm.

Description

technical field [0001] The invention belongs to the technical field of channel estimation technology for intelligent surface (RIS) assisted communication in the Internet of Vehicles environment, in particular to a channel estimation method and system based on positioning information in the Intelligent Surface (RIS) system in the Internet of Vehicles environment. Background technique [0002] In the past few decades, due to the invention of ultra-dense network (UDN), massive MIMO, millimeter wave communication, network energy consumption and hardware cost are still the key issues faced in practical implementation. For example, ultra-dense networks scale circuit and cooling energy consumption almost linearly with the number of newly deployed base stations, while efficient communication at mmWave frequencies requires expensive radio frequency chains and complex signal processing techniques. On the other hand, adding too many active components in the wireless network, such as ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04W4/40
CPCH04L25/0242H04W4/40
Inventor 曾嵘杭潇邵智敏包建荣
Owner HANGZHOU DIANZI UNIV
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