Optimizing Spectral Efficiency in RIS-Assisted Cell-Free Massive MIMO NOMA Systems
The core message of this article is to propose a joint optimization framework to maximize the sum spectral efficiency of a reconfigurable intelligent surface (RIS)-assisted cell-free massive multiple-input multiple-output (mMIMO) non-orthogonal multiple access (NOMA) system, considering imperfect channel state information and imperfect successive interference cancellation.
Geometry-Aware Meta-Learning Neural Network for Joint Phase Shift and Precoder Optimization in Reconfigurable Intelligent Surface-Aided Multi-User MISO Systems
A complex-valued, geometry-aware meta-learning neural network that maximizes the weighted sum rate in an RIS-aided multi-user MISO system by leveraging the complex circle geometry for phase shifts and spherical geometry for the precoder, leading to faster convergence and higher weighted sum rates compared to existing approaches.
Efficient Resource Allocation for Coexistence of Semantic and Bit Communications in 6G Networks
Efficient resource allocation schemes, including orthogonal multiple access (OMA), non-orthogonal multiple access (NOMA), and rate-splitting multiple access (RSMA), are investigated to enable the coexistence of semantic and bit communications in future 6G networks.
Optimizing Bit Error Probability in Dynamic Metasurface Antenna-Based Communication Systems
An iterative optimization algorithm is proposed to jointly adjust the transmit precoder and the weights of the dynamic metasurface antenna (DMA) elements to minimize the bit error probability (BEP) in a DMA-based communication system.
Optimal Power Allocation for Finite-Blocklength Incremental Redundancy Hybrid Automatic Repeat Request (IR-HARQ)
This work proposes a novel upper bound on the outage probability of finite-blocklength IR-HARQ, which enables efficient power allocation to minimize energy consumption while meeting the outage probability constraint.
Advancements in In-Band Full-Duplex Massive MIMO Systems: From Cellular Networks to Network-Assisted Cell-Free Architectures
The content presents a comprehensive overview of the decade-long advancements in in-band full-duplex (IBFD) massive multiple-input multiple-output (MIMO) systems, ranging from cellular networks to network-assisted cell-free massive MIMO (NAFD CF-mMIMO) architectures, highlighting the evolutionary trajectory and key benefits of each implementation.
Enhancing Wireless Powered Communications in IoT Networks through Active Reconfigurable Intelligent Surfaces
Integrating active reconfigurable intelligent surfaces (RISs) can significantly enhance energy transfer efficiency and data transmission performance in wireless-powered communication (WPC) systems for Internet of Things (IoT) networks.
Performance Analysis of Active Reconfigurable Intelligent Surface-Aided Terahertz Communications with Phase Quantization Errors and Beam Misalignment
This paper investigates the performance of active reconfigurable intelligent surface (RIS)-aided terahertz (THz) communication systems, focusing on the impact of discrete phase shifts and beam misalignment.
Enhancing Millimeter Wave High-Speed Train Communication Coverage through Refracting Reconfigurable Intelligent Surface-Assisted Ultra-Reliable and Low-Latency Communications
Deploying a refracting reconfigurable intelligent surface on high-speed train windows can effectively enhance the coverage and reliability of millimeter wave communications for ultra-reliable and low-latency applications.
Maximizing Achievable Covert Rate in XL-RIS Empowered Near-Field Communications
This paper proposes an optimization framework to maximize the achievable covert rate in an XL-RIS empowered near-field communication system, by jointly optimizing the hybrid analog-digital beamforming at the transmitter and the reflection coefficient matrix at the XL-RIS.
