Cognitive radio (CR) is an effective solution to improve the spectral efficiency (SE) of
wireless communications by allowing the secondary users (SUs) to share spectrum with …

A cell-free massive multiple-input multiple-output system is considered using a max-min
approach to maximize the minimum user rate with per-user power constraints. First, an …

Secure transmission techniques have been receiving growing attention in recent years, as a
viable, powerful alternative to blocking eavesdrop** attempts in an open wireless …

A cell-free Massive multiple-input multiple-output (MIMO) uplink is considered, where the
access points (APs) are connected to a central processing unit (CPU) through limited …

Cell-free massive multiple-input-multiple-output (MIMO) is considered, where distributed
access points (APs) multiply the received signal by the conjugate of the estimated channel …

This paper investigates the optimal power allocation scheme for sum throughput
maximization of non-orthogonal multiple access (NOMA) system with α-fairness. In contrast …

We consider a cell-free Massive multiple-input multiple-output (MIMO) system and
investigate the system performance for the case when the quantized version of the estimated …

In this paper, we develop various beamforming techniques for downlink transmission for
multiple-input single-output nonorthogonal multiple access (NOMA) systems. First, a …

Heterogeneous network (HetNet) deployment is considered a de facto solution for meeting
the ever increasing mobile traffic demand. However, excessive power usage in such …

The author presents a unified treatment of this highly interdisciplinary topic to help define the
notion of cognitive radio. The book begins with addressing issues such as the fundamental …