RIS and beam forming method and device based on RIS

Abstract

The invention relates to an RIS and a beam forming method and device based on the RIS, and each unit RIS is connected in parallel with a power sensor at the two ends of a phase shift circuit, so as to obtain the signal power at the position. The beam forming method based on the RIS comprises the following steps: at each preset moment, enabling a base station and terminal equipment to send pilot signals to the RIS at the same time, so that the pilot signals generate electromagnetic interference on the RIS to generate a corresponding electromagnetic field; acquiring the power of the electromagnetic field at the position of each RIS unit by using the power sensor of each RIS unit; and determining an optimal phase shift matrix of the RIS according to the power of the electromagnetic field at the position where each RIS unit is located, which is correspondingly acquired at all preset moments, so as to realize beam forming by using the optimal phase shift matrix of the RIS. According to the invention, a brand new beam forming method is designed, so that the channel estimation pilot frequency overhead required by beam forming is irrelevant to the number of RIS units, and the pilot frequency overhead required by beam forming is greatly reduced.

Description

technical field [0001] The present invention relates to the technical field of wireless mobile communications, and in particular, to a RIS and a RIS-based beamforming method and device. Background technique [0002] RIS (Reconfigurable Intelligent Surface) is a large-scale array composed of a large number of passive units (RIS units) that can control the phase of the signal. direction, its specific structure is as figure 1 shown. Because the cost and power consumption of RIS are very low, it has application value in scenarios such as overcoming interruptions, increasing capacity, and saving power generation. Therefore, RIS technology is considered to be a promising technology in future 6G communications. [0003] In order to maximize the signal-to-noise ratio when using RIS-assisted multi-antenna system communication, each RIS unit needs to adjust the appropriate phase shift to achieve optimal beamforming. In the current RIS-based beamforming method, CSI (Channel State In...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a RIS and RIS-based beamforming method and device to overcome the problem that the RIS unit cannot provide effective information for channel estimation and thus requires a huge pilot overhead to achieve beamforming, so as to reduce the Pilot overhead and reduce beamforming computation

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