196,657 research outputs found
The economic sustainability of smallâscale biogas plants in the italian context: The case of the cover slab technology
No full texthe growing interest on renewable energies, together with the public financial incentive systems established in several countries, has driven a fast innovation in the field of energy technologies, with the main objective to increase their sustainability. This paper focuses on the production of biogas from agro–residues and animal manure; with particular attention to small-scale plants. Based on a real case located in northern Italy, and taking into consideration the Italian public financial incentive system currently in force, the economic profitability of the cover slab technology is analysed, putting into evidence the main factors that affect it. © 2017
On the Selection of Semi-Orthogonal Users for Zero-Forcing Beamforming
No full textWe reconsider the role of user selection in multiuser
MIMO broadcast channels (downlink), in the relevant regime
where the number of users K is linear in the number of
transmitter (base station) antennas M. User selection is known to
achieve mutually quasi-orthogonal user channels and, at the same
time, a multiuser diversity effect in terms of receiver SNR. These
goals are achieved in the regime of fixed number of transmit
antennas, and very large number of users. In contrast, we show
that when K = O(M) these effects cannot be achieved, and the
role of user selection is marginal. In terms of system design, our
results suggest that only a small number K M of users should
feedback their channel state information at each point in time.
This greatly alleviates the burden of the channel state information
feedback, while achieving essentially optimal performance
Il "Ludwig Feuerbach" di Engels e la questione del materialismo: antefatti e conseguenze
No full textEffective Beamforming and Efficient Scheduling for Multi-User MIMO Broadcast Channels
No full textIn this paper, we focus on Multi-User MIMO
Broadcast Channels with few users feeding back their channel
estimates, i.e. K linear in the number M of transmitting
antennas. Under this condition, the chance of finding a subset
of users almost orthogonal vanishes when M gets large. For
this reason, we show that the Zero Forcing (ZF) beamformer,
commonly accepted for practical implementations, can be easily
outperformed by other schemes based on QR decomposition,
approaching the channel capacity. Our beamformer construction
is less complex than ZF greedy algorithms and more robust
than semi-orthogonal construction. At high SNR, we show that
even the sub-optimal Tomlinson-Harashima encoding technique
outperforms the ZF beamforming, halving the gap with respect
to Dirty Paper Coding
September 2020 at a glance: focus on heart failure with preserved ejection fraction and medical therapy
No full text
Oil spill trajectory: A comparison between 2D and 3D models
No full textOil spills in the marine environment are a harmful threat to the environment, the population, and the economy. For this reason, it is important to know the trajectory of oil slicks in case of a spill in order to prioritize actions for oil recovery and thus to better protect areas exposed to pollution risk. For this purpose, several oil slick drift models are developed to study the impact of various possible scenarios and to estimate the environmental sensitivity of a maritime and coastal area even before this type of accident occurs. In this context, this paper presents the applications of a two (2D) and three-dimensional (3D) oil spill models, suggested to define the trajectory of the oil slick in a marine environment taking into account different meteorological parameters. The two models have been applied to simulate the oil spill propagation in the case of a collision accident that occurred off Saint-Tropez (France) on 7 October 2018
Turbo-LORD: a Map-approaching Soft-Input Soft-output Detector for Iterative MIMO Receivers
No full text
- …
