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Backscatter Communication (BackCom), which is based on passive reflection andmodulation of an incident radio-frequency (RF) wave, has emerged as acutting-edge technological paradigm for self-sustainable Internet-of-things(IoT). Nevertheless, the contemporary BackCom systems are limited toshort-range and low data rate applications only, thus rendering theminsufficient on their own to support pervasive connectivity among the massivenumber of IoT devices. Meanwhile, wireless networks are rapidly evolvingtowards the smart radio paradigm. In this regard, reconfigurable intelligentsurfaces (RISs) have come to the forefront to transform the wirelesspropagation environment into a fully controllable and customizable space in acost-effective and energy-efficient manner. Targeting the sixth-generation (6G)horizon, we anticipate the integration of RISs into BackCom systems as a newfrontier for enabling 6G IoT networks. In this article, for the first time inthe open literature, we provide a tutorial overview of RIS-assisted BackCom(RIS-BackCom) systems. Specifically, we introduce the four different variantsof RIS-BackCom and identify the potential improvements that can be achieved byincorporating RISs into BackCom systems. In addition, owing to the unrivaledeffectiveness of non-orthogonal multiple access (NOMA), we present a case studyon an RIS-assisted NOMA-enhanced BackCom system. Finally, we outline the wayforward for translating this disruptive concept into real-world applications.

Reconfigurable Intelligent Surface-Assisted Backscatter Communication: A New Frontier for Enabling 6G IoT Networks