During the last years, the volume of data-traffic carried by mobile cellular networks has experienced a major growth and progress. The current networks’ features are not enough to face this development paradigm and the novel concept of small cells has emerged to increase the network capacity. However, the deployment of small cells introduces several technical challenges such as the cross-tier i...

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 channel and the quantized received signal are available at the central processing unit (CPU), and the case when only the quantized version of the combined signal with maximum ratio combining (MRC) detector is available at th...

The Point to multipoint wireless distribution is the most effective and affordable modality to deliver data to a high number of terminals distributed randomly in a wide area. The use of high density small cells, mandatory to increase the throughput per users, maintaining terminals at sub-6 GHz frequency, needs capillary backhaul networks that fibers cannot effectively provide. The TWEETHER proj...

Although limiting the number of backhauls, specifically chosen transit access points (TAPs) that forward traffic from other TAPs, reduces the overall costs of a wireless mesh network (WMN), an egress bottleneck is induced, which aggregates traffic and limits the bandwidth. To avoid such problems while working to minimize budgetary expenses, we balanced traffic flow on ‘to-be-determined’ backhau...

We consider the problem of energy-efficient network management in 5G systems, where backhaul and fronthaul nodes have both networking and computational capabilities. We devise an optimization model accounting for the main features of 5G backhaul and fronthaul, and jointly solve the problems of (i) node switch on/off, (ii) VNF placement, and (iii) traffic routing. We implement an optimization mo...

Network MIMO or distributed MIMO is one promising strategy to increase the data rates in future cellular communication systems. However, well-known schemes like linear preequalization or Tomlinson-Harashima precoding for handling the multiuser interference assume full coordination (via some centralized processing) between the base stations. This approach causes significant traffic in the (wired...

Millimeter-wave (mm-wave) radios have been gaining interest as one of the strong enabling physical layer technologies for the fifth-generation (5G) mobile and backhaul access. This paper aims at clarifying possible roles of the mm-wave radios in the 5G development and performing comprehensive literature survey on the radio channel modeling for the feasibility study of a radio link. Emphasis in ...

In this paper, equalization and precoding in multiuser multiple-input/multiple-output (MIMO) relaying systems are considered. In particular, the user devices are connected to relays or small base stations which only cover small areas, socalled small cells. Via wireless backhaul, the relays are in turn connected to a central base station, forming a two-hop multiuser relaying system. It is shown ...