High-speed mobility communication is one of the challenging scenarios because of the
rapidly changing channel involved. In light of this, the orthogonal time–frequency space …

This paper investigates the two-timescale transmission scheme for reconfigurable intelligent
surface (RIS)-aided massive multiple-input multiple-output (MIMO) systems, where the …

Massive multiple-input multiple-output (MaMIMO) has become an integral part of the fifth-
generation (5G) standard, and is envisioned to be further developed in beyond 5G (B5G) …

In this paper, we investigate a joint resource allocation algorithm in a time-division duplex
(TDD)-based cell-free massive MIMO (CFMM) system, which has great potential to improve …

This research studies the problem of a joint capacity/capacity reliability analysis of the
multiuser multi-input multioutput (MIMO) system functioning in the presence of generalized …

In multiuser multiple-input multiple-output (MU-MIMO) systems, channel correlation is
detrimental to system performance. We demonstrate that widely used, yet overly simplified …

In this paper, we optimize the secrecy capacity of the legitimate user under resource
allocation and security constraints for a multi-antenna environment for the simultaneous …

Scalable Multi‐antenna systems are designed to gain improvement in energy and spectral
efficiency under different propagation conditions by equip** the BSs with hundreds or …

The emerging technology, reconfigurable intelligent surface (RIS), could support high data
rate while maintaining low costs and energy consumption. Besides, it can constructively …

The major challenges faced by the mobile users are the poor quality of communication and
the fast battery drainage. The varying channel characteristics in wireless communication is …