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IEEE/ICACT20230228 Slide.11        [Big Slide]	Oral Presentation
	In addition, RIS channel model is divided into two scenarios that is near-field model and far-field model. Both models are shown in these two kinds of equations. Far-field model usually means the distance between the RIS and transmitter/receiver is long, and system works over a low frequency band. On the contrary, near-field model is more appropriate for RIS system located in an indoor case over mmWave band.

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