Rate Splitting in MIMO RIS-assisted Systems with Hardware Impairments and Improper Signaling
arXiv:2208.08753 · doi:10.1109/TVT.2022.3222633
Abstract
In this paper, we propose an optimization framework for rate splitting (RS) techniques in multiple-input multiple-output (MIMO) reconfigurable intelligent surface (RIS)-assisted systems, possibly with I/Q imbalance (IQI). This framework can be applied to any optimization problem in which the objective and/or constraints are linear functions of the rates and/or transmit covariance matrices. Such problems include minimum-weighted and weighted-sum rate maximization, total power minimization for a target rate, minimum-weighted energy efficiency (EE) and global EE maximization. The framework may be applied to any interference-limited system with hardware impairments. For the sake of illustration, we consider a multicell MIMO RIS-assisted broadcast channel (BC) in which the base stations (BSs) and/or the users may suffer from IQI. Since IQI generates improper noise, we consider improper Gaussian signaling (IGS) as an interference-management technique that can additionally compensate for IQI. We show that RS when combined with IGS can substantially improve the spectral and energy efficiency of overloaded networks (i.e., when the number of users per cell is larger than the number of transmit/receive antennas).
arXiv commentaccepted at IEEE Transaction on Vehicular Technology
References in corpus (13)
- Rate-Splitting Multiple Access: Fundamentals, Survey, and Future Research Trends
- Rate-Splitting Multiple Access for Downlink Communication Systems: Bridging, Generalizing and Outperforming SDMA and NOMA
- STAR: Simultaneous Transmission And Reflection for 360° Coverage by Intelligent Surfaces
- A Framework of Robust Transmission Design for IRS-aided MISO Communications with Imperfect Cascaded Channels
- Rate Splitting for MIMO Wireless Networks: A Promising PHY-Layer Strategy for LTE Evolution
- Exploiting Intelligent Reflecting Surfaces in NOMA Networks: Joint Beamforming Optimization
- Robust Transmission in Downlink Multiuser MISO Systems: A Rate-Splitting Approach
- Degrees of Freedom of Time Correlated MISO Broadcast Channel with Delayed CSIT
- Transmit Optimization with Improper Gaussian Signaling for Interference Channels
- Rate-Splitting to Mitigate Residual Transceiver Hardware Impairments in Massive MIMO Systems
- Rate region boundary of the SISO Z-interference channel with improper signaling
- A Journey from Improper Gaussian Signaling to Asymmetric Signaling
- Improper Signaling for SISO Two-user Interference Channels with Additive Asymmetric Hardware Distortion