Reconfigurable Intelligent Surface Assisted OFDM Relaying: Subcarrier Matching With Balanced SNR

Zhang, Tong; Wang, Shuai; Zhuang, Yufan; You, Changsheng; Wen, Miaowen; Wu, Yik-Chung

doi:10.1109/tvt.2022.3213368

Cited by 9 publications

(1 citation statement)

References 44 publications

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“…We provide a brief summary for the papers on RIS in OFDM systems in Table I, based on the system model, the considered performance metric, assumptions regarding the devices, and the considered RIS technology. Even though the studies in [41]- [49], [51], [52], [54]- [66] have provided a valuable insight on the performance of RIS in OFDM systems, there are still some open problems in RIS-aided OFDM systems, which are the focus of this paper. For instance, the performance of RIS has not been studied in multi-user MIMO OFDM systems.…”

Section: B Motivationmentioning

confidence: 99%

Rate Splitting in MIMO RIS-Assisted Systems With Hardware Impairments and Improper Signaling

Soleymani

Santamarı́a

Jorswieck

2023

IEEE Trans. Veh. Technol.

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This paper proposes schemes to improve the spectral efficiency of a multiple-input multiple-output (MIMO) broadcast channel (BC) with I/Q imbalance (IQI) at transceivers by employing a combination of improper Gaussian signaling (IGS), non-orthogonal multiple access (NOMA) and simultaneously transmit and reflect (STAR) reconfigurable intelligent surface (RIS). When there exists IQI, the output RF signal is a widely linear transformation of the input signal, which may make the output signal improper. To compensate for IQI, we employ IGS, thus generating a transmit improper signal. We show that IGS alongside with NOMA can highly increase the minimum rate of the users. Moreover, we propose schemes for different operational modes of STAR-RIS and show that STAR-RIS can significantly improve the system performance. Additionally, we show that IQI can highly degrade the performance especially if it is overlooked in the design.

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