Multi-cell wireless communication method based on intelligent reflecting surface

Abstract

The invention discloses a multi-cell wireless communication method based on an intelligent reflecting surface. The method aims at a system comprising a plurality of cooperative cells. An intelligent reflecting surface is arranged in each cooperative cell, and each cooperative cell is provided with a base station and a user terminal. The method comprises the steps that a user terminal transmits a pilot signal to a base station in each cooperative cell, and each base station estimates and shares channel state information, acquires global channel state information and formulates a transmitting beam forming model; and the intelligent reflecting surface formulates a reflected beam forming model, and obtains coefficients of transmitted beam forming and reflected beam forming through modeling andsolving, thereby forming a signal for suppressing interference. According to the method, higher signal gain can be obtained when the cell base station is far away from the corresponding user terminal, and at the same time fairness between the user terminals is considered; mutual interference between the user terminals can be effectively reduced through joint optimization of sending beam forming and reflection beam forming; and the transmission efficiency of wireless communication transmission is improved.

Description

technical field [0001] The present application relates to the technical field of wireless communication, in particular to a multi-cell wireless communication method based on an intelligent reflecting surface. Background technique [0002] Driven by the emerging Internet of Things and the explosive growth of artificial intelligence applications, mobile cellular networks of the fifth generation (5G) and beyond need to meet various stringent communication requirements to be able to serve a large number of wireless devices. For this reason, base stations are densely deployed to shorten the distance to user terminals, and device-to-device (Device-to-Device, D2D) communication enables traditional cellular network transmission to provide more spectrum reuse opportunities. However, the emergence of multiple base stations and D2D communication in 5G and above cellular networks will also introduce serious signal interference to system user terminals, which is an urgent problem to be d...

AI Technical Summary

Problems solved by technology

However, even a dense network using the techniques described above can present problems

First, with the increase in the number of base stations and the number of transmitting antennas, the cost of building base stations and corresponding radio frequency links is also increasing

Second, as the distance between the base station and the base station is reduced, the user terminal is more likely to be close to the edge of the cell, which makes the interference problem more serious

Third, there will inevitably be obstacles in the signal transmission process, which also leads to the signal being blocked, resulting in problems such as too low signal strength and narrowed transmission coverage

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