19 research outputs found
Test of 5G System in the Reverberation Chamber at mm-wave
The performance of a real fifth generation base station was studied by using a reverberation chamber as a real life propagating environment. Preliminary tests were conducted in order to define 5G base station operation conditions at mmwave and emulated scenarios where reconfigurable intelligent surface(s) (RISs) will successively be tested. Measurements campaign was carried out under the H2020 European project RISE6G and a collaboration program between TIM S.p.A., Nokia and Università Politecnica delle Marche
SOD polymorphism in the Xiphinema americanum-group (Nematoda: Longidoridae)
Isoelectrofocusing of superoxide dismutase (SOD) isoforms was carried out on the extracts of 117 nematode populations
belonging to the so-called Xiphinema americanum-group. These populations came from the USA (77), Chile (5), Argentina (1),
Venezuela (5), Portugal (15), Italy (2), Crete (1), Montenegro (1), Slovakia (4), Hungary (3), Egypt (1) and India (2). A total of
17 bands of enzyme activity were observed in the screening, whilst single enzyme phenotypes showed from two to eight bands. The
high degree of SOD polymorphism of this nematode collection was grouped by cluster analysis into seven distinct homogeneous groups
characterised by specific combinations of SOD markers. Sub-groups could be discriminated for larger groups. The small Groups 3 and 5
were constituted mostly by populations from USA east coast states (i.e., NY and PA, respectively). The larger Group 1 resulted from the
association of populations coming from various and distant North American States. In other large groups, North American populations
were associated with South American and European populations. Overall, the data presented here suggest that geographic separation and
different hosts do not seem to be the source of genetic diversity for the X. americanum-group. When an adequate number of populations
were collected from the same country, the variability expressed by such a sub-sample was comparable to that of the whole nematode
collection. For the first time, homogeneous populations of a large collection of X. americanum-group populations were associated by
molecular means in order to explore further approaches that may help resolve the recalcitrant taxonomy and phylogeny of this much
debated group
Smart Wireless Environments Enabled by RISs: Deployment Scenarios and Two Key Challenges
Reconfigurable Intelligent Surfaces (RISs) constitute the enabler for programmable propagation of electromagnetic signals, and are lately being considered as a candidate physicallayer technology for the demanding connectivity, reliability, localization, and sustainability requirements of next generation wireless communications networks. In this paper, we present various deployment scenarios for RIS-enabled smart wireless environments that have been recently designed by the ongoing EU H2020 RISE-6G project. The scenarios are taxonomized according to performance objectives, in particular, connectivity and reliability, localization and sensing, as well as sustainability and secrecy. We identify various deployment strategies and sketch the core architectural requirements in terms of RIS control and signaling, depending on the RIS hardware architectures and their respective capabilities. Furthermore, we introduce and discuss, via preliminary simulation results and reflectarray measurements, two key novel challenges with RIS-enabled smart wireless environments, namely, the area of influence and the bandwidth of influence of RISs, which corroborate the need for careful deployment and planning of this new technology