Tang, W; Dai, JY; Zheng Chen, M; Wong, KK; Li, X; Zhao, X; Jin, S; ... Cui, TJ; + view all Tang, W; Dai, JY; Zheng Chen, M; Wong, KK; Li, X; Zhao, X; Jin, S; Cheng, Q; Cui, TJ; - view fewer (2020) Design and Implementation of MIMO Transmission through Reconfigurable Intelligent Surface. In: IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC. IEEE: Atlanta, GA, USA.

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Abstract

By the ability to periodically change the reflection coefficients of the unit cells of the reconfigurable intelligent surface (RIS), RIS-empowered wireless transmitter has emerged as an attractive paradigm that can achieve information modulation and transmission in a cost-effective and energy-efficient manner. However, only the phase electromagnetic response of the RISs can be flexibly manipulated in most cases, which significantly limits the transmission rate of RIS-based transmitters. In this paper, RIS-based quadrature amplitude modulation (QAM) and multiple-input multiple-output (MIMO) transmission are designed to improve the communication rate of RIS-based transmitter. In addition, our proposed method of achieving RIS-based MIMO-QAM is proved to be robust with the discrete phase shift of the RIS. Furthermore, a prototype is implemented to perform real-time RIS-based MIMO-QAM transmission over the air, which practically validates the proposed approach

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