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IEEE/ICACT20220275 Slide.10        [Big Slide]	Oral Presentation
	IRS enables the reconfiguration of wireless propagation environment by smartly controlling the signal reflections via its massive low-cost passive elements.¡¡By coordinating IRS¡¯s reflections, it is possible to deliver radio waves to NLoS users and to improve the power strength of edge users by relaying them. The communication procedure between AP and User using IRS is as follows: First, A user send the uplink pilot signals to an AP via an IRS. Next, The AP estimate the concatenated user-IRS-AP channel based on the uplink pilot signals from the user. Next, IRS controller set a new reflection pattern to the IRS. Finally, the AP send signals to the user via IRS.

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