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Reconfigurable Intelligent Surfaces for 6G Systems: Principles, Applications, and Research Directions

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arxiv 2011.04300 v4 pith:DEPWZ4YX submitted 2020-11-09 eess.SP

Reconfigurable Intelligent Surfaces for 6G Systems: Principles, Applications, and Research Directions

Cunhua Pan , Hong Ren , Kezhi Wang , Jonas Florentin Kolb , Maged Elkashlan , Ming Chen , Marco Di Renzo , Yang Hao
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Jiangzhou Wang A. Lee Swindlehurst Xiaohu You Lajos Hanzo
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Reconfigurable intelligent surfaces (RISs) or intelligent reflecting surfaces (IRSs), are regarded as one of the most promising and revolutionizing techniques for enhancing the spectrum and/or energy efficiency of wireless systems. These devices are capable of reconfiguring the wireless propagation environment by carefully tuning the phase shifts of a large number of low-cost passive reflecting elements. In this article, we aim for answering four fundmental questions: 1) Why do we need RISs? 2) What is an RIS? 3) What are RIS's applications? 4) What are the relevant challenges and future research directions? In response, eight promising research directions are pointed out.

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