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Method for suppressing Doppler effect in V2X communication based on RIS

A Doppler effect and Doppler frequency shift technology, which is applied in the field of Doppler effect suppression in V2X communication based on RIS, can solve problems such as inter-symbol interference, and achieve maximum amplitude, reduced fading mode, and approximately constant amplitude Effect

Active Publication Date: 2020-12-11
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology

Compared with traditional wireless communication, V2X communication is challenged by inter-symbol interference due to different delays of multipath components, and Doppler effect due to high mobility of vehicles and / or surrounding objects

Method used

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  • Method for suppressing Doppler effect in V2X communication based on RIS

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Embodiment Construction

[0016] The technical scheme of the present invention is described in detail below:

[0017] The present invention proposes a method for suppressing the Doppler effect in V2X communication based on RIS, which has a base station (BS), a moving vehicle, M interactive objects, N A reconfigurable smart surface RIS. vehicle with V Move at a speed of m / s. In this communication system, in addition to the line-of-sight signal from the base station, the primary reflection signal reflected from the interactive object also reaches the vehicle's receiver. Assuming the reflecting surface is sufficiently large and smooth, specular reflection occurs according to Snell's law. Without loss of generality, we consider a reflection coefficient of −1 for unit magnitude and phase of interacting objects for ease of illustration. And assume that all reflected signals from interactive objects remain parallel for a short time during the movement of the vehicle. Assuming uncontrollable reflectors, ...

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Abstract

The invention provides a method for suppressing Doppler effect and multipath fading by using a reconfigurable intelligent surface RIS in vehicle-to-infrastructure (V2X for short) communication. According to the method, the RIS is arranged in a communication environment, the arrangement of the RIS for replacing the interactive objects is optimized, and the optimal arrangement mode is selected. By adjusting reflection of each unit of the RIS in real time, rapid fluctuation of received signals caused by the Doppler effect is effectively reduced, and the Doppler effect and multipath fading are inhibited.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for suppressing Doppler effect in V2X communication based on RIS. Background technique [0002] Vehicle-mounted wireless communication uses the mobile vehicle body as the carrier of the communication terminal, and realizes real-time information interaction for user safety and service business through the signal transmission of the wireless network. Among them, vehicle-to-infrastructure (V2X) communication has received more and more attention in road safety and other applications. Compared with traditional wireless communication, V2X communication faces the challenges of inter-symbol interference due to different delays of multipath components, and Doppler effect due to high mobility of vehicles and / or surrounding objects. [0003] In recent years, reconfigurable smart surfaces (RIS for short) have attracted the attention of the wireless research community...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/01H04W4/40
CPCH04B7/01H04W4/40
Inventor 丁青锋杨倩徐梦引
Owner EAST CHINA JIAOTONG UNIVERSITY
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