Precoding for RIS-Assisted Multi-User MIMO-DQSM Transmission Systems

Castillo-Soria, Francisco R.; Del-Puerto-Flores, J. Alberto; Azurdia-Meza, Cesar A.; Kumaravelu, Vinoth Babu; Simón, Jorge; Gutiérrez, Carlos A.

doi:10.3390/fi15090299

Precoding for RIS-Assisted Multi-User MIMO-DQSM Transmission Systems

Journal

Future Internet

ISSN

1999-5903

Date Issued

2023

Author(s)

Castillo-Soria, Francisco R.

Del-Puerto-Flores, J. Alberto

Facultad de Ingeniería - CampGDL

Azurdia-Meza, Cesar A.

Kumaravelu, Vinoth Babu

Simón, Jorge

Gutiérrez, Carlos A.

Type

text::journal::journal article

DOI

10.3390/fi15090299

URL

https://scripta.up.edu.mx/handle/20.500.12552/9886

Abstract

This paper presents two precoding techniques for a reconfigurable intelligent surface (RIS)-assisted multi-user (MU) multiple-input multiple-output (MIMO) double quadrature spatial modulation (DQSM) downlink transmission system. Instead of being applied at the remote RIS, the phase shift vector is applied at the base station (BS) by using a double precoding stage. Results show that the proposed RIS-MU-MIMO-DQSM system has gains of up to 17 dB in terms of bit error rate (BER) and a reduction in detection complexity of 51% when compared with the conventional MU-MIMO system based on quadrature amplitude modulation (QAM). Compared with a similar system based on amplify and forward (AF) relay-assisted technique, the proposed system has a gain of up to 18 dB in terms of BER under the same conditions and parameters.