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In this paper, we study the achievable rate region of 1-layer rate splitting(RS) in the presence of hardware impairment (HWI) and improper Gaussiansignaling (IGS) for a single-cell reconfigurable intelligent surface (RIS)assisted broadcast channel (BC). We assume that the transceivers may sufferfrom an imbalance in in-band and quadrature signals, which is known as I/Qimbalance (IQI). The received signal and noise can be improper when thereexists IQI. Therefore, we employ IGS to compensate for IQI as well as to manageinterference. Our results show that RS and RIS can significantly enlarge therate region, where the role of RS is to manage interference while RIS mainlyimproves the coverage.

Rate Region of MIMO RIS-assisted Broadcast Channels with Rate Splitting and Improper Signaling