Joint Reflecting and Precoding Designs for SER Minimization in Reconfigurable Intelligent Surfaces Assisted MIMO Systems

This paper investigates the use of a reconfigurable intelligent surface (RIS) to aid point-to-point multi-data-stream multiple-input multiple-output (MIMO) wireless communications. With practical finite alphabet input, the reflecting elements at the RIS and the precoder at the transmitter are altern...

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Bibliographic Details
Published in:IEEE transactions on wireless communications Vol. 19; no. 8; pp. 5561 - 5574
Main Authors: Ye, Jia, Guo, Shuaishuai, Alouini, Mohamed-Slim
Format: Journal Article
Language:English
Published: New York IEEE 01.08.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Array signal processing
Data transmission
Interference
Mathematical analysis
Matrix methods
MIMO communication
Optimization
phase shifts design
precoder design
Precoding
Reconfigurable intelligent surface
Reconfigurable intelligent surfaces
Relay systems
Signal to noise ratio
symbol error rate
Wireless communication
Wireless communications
ISSN:1536-1276, 1558-2248
Online Access:Get full text
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Summary:This paper investigates the use of a reconfigurable intelligent surface (RIS) to aid point-to-point multi-data-stream multiple-input multiple-output (MIMO) wireless communications. With practical finite alphabet input, the reflecting elements at the RIS and the precoder at the transmitter are alternatively optimized to minimize the symbol error rate (MSER). In the reflecting optimization with a fixed precoder, two reflecting design methods are developed, referred as eMSER-Reflecting and vMSER-Reflecting. In the optimization of the precoding matrix with a fixed reflecting pattern, the matrix optimization is transformed to be a vector optimization problem and two methods are proposed to solve it, which are referred as MSER-Precoding and MMED-Precoding. The superiority of the proposed designs is investigated by simulations. Simulation results demonstrate that the proposed reflecting and precoding designs can offer a lower SER than existing designs with the assumption of complex Gaussian input. Moreover, we compare RIS with a full-duplex Amplify-and-Forward (AF) relay system in terms of SER to show the advantage of RIS.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2020.2994455