1,055 research outputs found
Joint Design of Overlaid Communication Systems and Pulsed Radars
The focus of this paper is on co-existence between a communication system and
a pulsed radar sharing the same bandwidth. Based on the fact that the
interference generated by the radar onto the communication receiver is
intermittent and depends on the density of scattering objects (such as, e.g.,
targets), we first show that the communication system is equivalent to a set of
independent parallel channels, whereby pre-coding on each channel can be
introduced as a new degree of freedom. We introduce a new figure of merit,
named the {\em compound rate}, which is a convex combination of rates with and
without interference, to be optimized under constraints concerning the
signal-to-interference-plus-noise ratio (including {\em signal-dependent}
interference due to clutter) experienced by the radar and obviously the powers
emitted by the two systems: the degrees of freedom are the radar waveform and
the afore-mentioned encoding matrix for the communication symbols. We provide
closed-form solutions for the optimum transmit policies for both systems under
two basic models for the scattering produced by the radar onto the
communication receiver, and account for possible correlation of the
signal-independent fraction of the interference impinging on the radar. We also
discuss the region of the achievable communication rates with and without
interference. A thorough performance assessment shows the potentials and the
limitations of the proposed co-existing architecture
A high throughput Intrusion Detection System (IDS) to enhance the security of data transmission among research centers
Data breaches and cyberattacks represent a severe problem in higher education
institutions and universities that can result in illegal access to sensitive
information and data loss. To enhance the security of data transmission,
Intrusion Prevention Systems (IPS, i.e., firewalls) and Intrusion Detection
Systems (IDS, i.e., packet sniffers) are used to detect potential threats in
the exchanged data. IPSs and IDSs are usually designed as software programs
running on a server machine. However, when the speed of exchanged data is too
high, this solution can become unreliable. In this case, IPSs and IDSs designed
on a real hardware platform, such as ASICs and FPGAs, represent a more reliable
solution. This paper presents a packet sniffer that was designed using a
commercial FPGA development board. The system can support a data throughput of
10 Gbit/s with preliminary results showing that the speed of data transmission
can be reliably extended to 100 Gbit/s. The designed system is highly
configurable by the user and can enhance the data protection of information
transmitted using the Ethernet protocol. It is particularly suited for the
security of universities and research centers, where point-to-point network
connections are dominant and large amount of sensitive data are shared among
different hosts.Comment: 10 pages, 10 figures, 16th Topical Seminar on Innovative Particle and
Radiation Detectors (IPRD23), 25-29 September 2023, Siena, Ital
Explicit recognition of emotional facial expressions is shaped by expertise: evidence from professional actors
Can reading others' emotional states be shaped by expertise? We assessed processing of emotional facial expressions in professional actors trained either to voluntary activate mimicry to reproduce character's emotions (as foreseen by the “Mimic Method”), or to infer others' inner states from reading the emotional context (as foreseen by “Stanislavski Method”). In explicit recognition of facial expressions (Experiment 1), the two experimental groups differed from each other and from a control group with no acting experience: the Mimic group was more accurate, whereas the Stanislavski group was slower. Neither acting experience, instead, influenced implicit processing of emotional faces (Experiment 2). We argue that expertise can selectively influence explicit recognition of others' facial expressions, depending on the kind of “emotional expertise”
Joint Design of surveillance radar and MIMO communication in cluttered environments
In this study, we consider a spectrum sharing architecture, wherein a
multiple-input multiple-output communication system cooperatively coexists with
a surveillance radar. The degrees of freedom for system design are the transmit
powers of both systems, the receive linear filters used for pulse compression
and interference mitigation at the radar receiver, and the space-time
communication codebook. The design criterion is the maximization of the mutual
information between the input and output symbols of the communication system,
subject to constraints aimed at safeguarding the radar performance. Unlike
previous studies, we do not require any time-synchronization between the two
systems, and we guarantee the radar performance on all of the range-azimuth
cells of the patrolled region under signal-dependent (endogenous) and
signal-independent (exogenous) interference. This leads to a non-convex
problem, and an approximate solution is thus introduced using a block
coordinate ascent method. A thorough analysis is provided to show the merits of
the proposed approach and emphasize the inherent tradeoff among the achievable
mutual information, the density of scatterers in the environment, and the
number of protected radar cells.Comment: Submitted to IEEE Transaction on Signal Processing on June 24, 201
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