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Channel estimation method and system based on positioning information in ris system under Internet of Vehicles environment

A positioning information and channel estimation technology, applied in the field of channel estimation, can solve problems such as difficult to satisfy time-varying channel wireless network dynamics, achieve the effect of reducing time complexity and improving signal power

Active Publication Date: 2022-05-27
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the traditional reflective surface only has a fixed phase shifter 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 in ris system under Internet of Vehicles environment
  • Channel estimation method and system based on positioning information in ris system under Internet of Vehicles environment
  • Channel estimation method and system based on positioning information in ris system under Internet of Vehicles environment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0102] Step 1: Obtain the relative position information of the objects in communication based on the Internet of Vehicles system, first initialize the relative positions of the sender, the smart reflector and the receiver, 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 position of the center point of the corresponding communication device.

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

[0108]

[0109]

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

Embodiment 2

[0138] like figure 1 As shown, the present embodiment is a channel estimation system assisted by positioning information in the RIS system in the Internet of Vehicles environment, which specifically includes the following modules:

[0139] Relative position acquisition module: Based on the Internet of Vehicles system to obtain the relative position information of the objects in communication, first initialize the relative positions of the sender, the smart reflector and the receiver, 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 position of the center point of the corresponding communication device.

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

[0145]

[0146]

[0147] The azimuth and elevation angles of...

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Abstract

The invention discloses a positioning information-assisted channel estimation method and system in an RIS system under the Internet of Vehicles environment. The method of the invention includes the following steps: Step 1: Obtain the relative positions of the base station, RIS, and vehicle receiving end according to the Internet of Vehicles; Step 2 : Obtain the azimuth and elevation angles from the base station to the RIS and from the RIS to the receiving end during the propagation process of the effective signal according to the relative position; Step 3: According to the azimuth and elevation angles of the received signal and the reflected signal of the RIS, construct the cascade from the base station to the RIS Channel G, and concatenated channel h from RIS to receiver r,k ; Step 4: Consider the downlink pilot transmission, construct a channel model, convert the signal received by the single-user receiving end, and construct a cascaded channel Step 5: Use the position information, based on the criterion of the maximum received signal power at the receiving end, calculate RIS for each unit , and construct the reflection coefficient matrix Θ; Step 6: According to the obtained reflection coefficient matrix Θ and the single-user received signal y k , get the estimated channel Hc through 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, and particularly relates to a method and system for channel estimation based on positioning information assistance in an 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, mmWave 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 RF chains and complex signal processing techniques. On the other hand, adding too many active components, such as cell sites / relays, to t...

Claims

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Application Information

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Patent Type & Authority Patents(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