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%25 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.

authors

• Castillo Soria Francisco Rubén
• Gutiérrez Díaz De León Carlos Adrián
• Simón J.

publication date

• 2023-01-01

published in

• Future Internet  Journal

keywords

• precoding, RIS, double-QSM, MIMO, multi-user detection

Digital Object Identifier (DOI)

• 10.3390/fi15090299

PubMed ID

start page

end page

volume

• 15

issue

• 9