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IEEE/ICACT20230234 Slide.02        [Big Slide]	Oral Presentation
	Recently, Intelligent Refractive Surface (IRS) has been actively studied. IRS is expected to compensate for the high directivity of millimeter-wave wireless communications by controlling the reflections. There are two main types of IRS systems possible: centralized and distributed. The centralized IRS, shown at left, eliminates blind zones by controlling the directivity of the signal. On the other hand, the distributed IRS shown on the right can extend MIMO spatial multiplexing by configuring multipaths.

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