Spectral Efficiency Analysis of Hybrid Relay-Reflecting Intelligent Surface-Assisted Cell-Free Massive MIMO Systems
A cell-free (CF) massive multiple-input-multiple-output (mMIMO) system can provide uniform spectral efficiency (SE) with simple signal processing. On the other hand, a […]
Hybrid Relay-Reflecting Intelligent Surface-Assisted Wireless Communications
Reconfigurable intelligent surface (RIS) has emerged as a cost- and energy-efficient solution to enhance the wireless communications capacity. However recent studies show […]
Passive RIS vs. Hybrid RIS
The reconfigurable intelligent surface (RIS) plays an important role in maintaining the connectivity in millimeter wave (mmWave) MIMO systems when the direct […]
Resource Allocation and User Association for Load Balancing in NOMA-Based Cellular Heterogeneous Networks
Small cells, specially femtocells, are deployed in the coverage of macrocells and form underlay heterogeneous networks (HetNets) to increase the capacity of […]
QSM based NOMA for Multi-User Wireless Communication
In this study, a quadrature spatial modulation (QSM) based non-orthogonal multiple access (NOMA) for multiuser, named as NOMA-QSM, is proposed. The main […]