In this paper, we investigate the energy-efficient resource allocation in two-tier massive
multiple-input multiple-output (mMIMO) heterogeneous networks with wireless backhaul …

This paper studies the uplink (UL) transmission of a generalized cell-free massive multiple-
input multiple-output (massive MIMO) system in which multiple base stations (or access …

We investigate the cell coverage optimization problem for the massive multiple-input
multiple-output (MIMO) uplink. By deploying tilt-adjustable antenna arrays at the base …

The traditional multiple input multiple output (MIMO) systems cannot provide very high
Spectral Efficiency (SE), Energy Efficiency (EE), and link reliability, which are critical to …

Massive MIMO is a promising technique for increasing the spectral efficiency (SE) of cellular
networks, by deploying antenna arrays with hundreds or thousands of active elements at the …

Hybrid analog-digital (HAD) beamforming architectures have been proposed to facilitate the
practical implementation of massive multiple-input multiple-output (MIMO) systems by …

When the wireless communication system evolves to massive multiple-input multiple-output
(MIMO) system, the system becomes more and more complex. Hybrid beamforming …

The need for bandwidth and the incitation to reduce power consumption lead to the
reduction of cell size in wireless networks. This allows reducing the distance between a user …

This two-part paper aims to quantify the cost of device activity detection in an uplink massive
connectivity scenario with a large number of devices but device activities are sporadic. Part I …

Cell-free massive multiple-input multiple-output (CF-mMIMO) systems are expected to
provide faster and more robust connections to user equipments by cooperation of a massive …