Mobile data traffic grew by 74% in 2015 and it is expected to grow eight-fold by 2020. Future
wireless networks will need to deploy massive number of small cells to cope with this …

With the enormous increase in application demands and user's data rate, high Quality of
Service (QoS) has attracted significant attention from the mobile operators and academia in …

Imagine a coverage area with many wireless access points that cooperate to jointly serve
the users, instead of creating autonomous cells. Such a cell-free network operation can …

5G will have to support a multitude of new applications with a wide variety of requirements,
including higher peak and user data rates, reduced latency, enhanced indoor coverage …

This paper presents an overview of the theory and currently known techniques for multi-cell
MIMO (multiple input multiple output) cooperation in wireless networks. In dense networks …

Ubiquitous cell-free massive MIMO (multiple-input multiple-output) combines massive MIMO
technology and user-centric transmission in a distributed architecture. All the access points …

Time-Division Duplexing (TDD) allows to estimate the downlink channels for an arbitrarily
large number of base station antennas from a finite number of orthogonal uplink pilot …

The use of multiple antennas at base stations is a key component in the design of cellular
communication systems that can meet high-capacity demands in the downlink. Under ideal …

In a conventional wireless cellular system, signal processing is performed on a per-cell
basis; out-of-cell interference is treated as background noise. This paper considers the …

Millimeter-wave (mmWave) will be used for fifth-generation (5G) wireless systems. While
many recent empirical studies have presented propagation characteristics at mmWave …