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research High capacity wireless systems 
This research area is focused on radio telecommunication systems beyond the fifth generation that can guarantee pervasive, high speed connectivity with high energy efficiency. The key technologies, enabling the expected performance growth of wireless systems, have to be searched in the fields radio resource allocation, interference and cooperation management, multiple antennas, new RANs architectures. We have static simulation tools, more suitable for network analysis (coverage and capacity), and dynamic simulation tools, for tracking the time-variant behavior of the network.
Resource Management
OFDMA and multi-carrier systems
In OFDMA systems, dynamic radio resource allocation can modify the assignment of sub-channels (in frequency), modulation profiles, and transmitted power of each user. We have developed innovative resource allocation strategies also enhanced by the awareness of interference relations among the terminals.
   
Applications to D2D
  Applications to NB-IoT
 
  Modeling
Interesting is the activity in the modelling and estimation of the inter-cellular interference in the presence of adaptive resource allocation strategies, also in terms of dynamical, temporal fluctuations. The goal of this research field is the theoretical evaluation of the network capacity in the presence of power control, radio resource allocation algorithms and inter-cellular interference.
   
High capacity point-to-point links
New strategies for increasing the point-to-point link capacity are under investigation, with high potential application to the cellular back-hauling with spectral efficiency greater than 16 bit/s/Hz [13b][17b]. The study has been extended to the analysis of equalization architectures for MIMO links in presence of impairments like phase noise or frequency offsets.
Full Duplex
  Full-Duplex (FD) radio technology, which enables concurrent transmission and reception in the same spectrum at the same time, has been implemented experimentally only for short-range transmissions and it is affected by numerous limitations. In order to relax the constraints on self-interference cancellation, we have proposed a Partial-Duplex (PD) approach [17e], which consists of a communication link with the capability of supporting connection in both directions at the same time in a portion of the bandwidth (FD) and with a frequency division for uplink and downlink in the rest of the band (HD). In this context, we are investigating performance limits [18g] and encoding solutions [17g].
   
Information Transmission Group 
Dipartimento di Elettronica, Informazione e Bioingengeria (DEIB)  Politecnico di Milano 
P.zza Leonardo da Vinci 32, 20133 Milano - Italy 
e-mail: luca.reggiani@polimi.it 
Last updated Jan. 2020