The commercial fifth-generation (5G) wireless communications networks have already been
deployed with the aim of providing high data rates. However, the rapid growth in the number …

Due to the advancements in cellular technologies and the dense deployment of cellular
infrastructure, integrating unmanned aerial vehicles (UAVs) into the fifth-generation (5G) and …

In this paper, intelligent reflecting surfaces (IRSs) are employed to enhance the physical
layer security in a challenging radio environment. In particular, a multi-antenna access point …

Multiple antenna technologies have attracted much research interest for several decades
and have gradually made their way into mainstream communication systems. Two main …

After about a decade of intense research, spurred by both economic and operational
considerations, and by environmental concerns, energy efficiency has now become a key …

This monograph presents a unified framework for energy efficiency maximization in wireless
networks via fractional programming theory. The definition of energy efficiency is introduced …

In-band full-duplex (IBFD) transmission represents an attractive option for increasing the
throughput of wireless communication systems. A key challenge for IBFD transmission is …

With years of tremendous traffic and energy consumption growth, green radio has been
valued not only for theoretical research interests but also for the operational expenditure …

In a cell-free massive MIMO architecture a very large number of distributed access points
simultaneously and jointly serves a much smaller number of mobile stations; a variant of the …

We propose a data-aided transmit beamforming scheme for the multi-user multiple-input-
single-output (MISO) downlink channel. While conventional beamforming schemes aim at …