no code implementations • 27 Jun 2023 • Emanuele Grossi, Luca Venturino
After introducing a convenient signal model and discussing the impact of the signal bandwidth, the source-RIS channel, and the system geometry on the involved derivations, we propose to optimize the waveform emitted by each source and the phase shifts introduced by the RIS to match a desired space-frequency distribution of the far-field radiation pattern, which may be relevant in both radar and communication applications.
no code implementations • 10 May 2023 • Emanuele Grossi, Luca Venturino
We consider a radar architecture where an illuminator composed of few sources is used as a feeder for a (passive) reconfigurable intelligent surface (RIS), so as to mimic the behavior of a multiple-input multiple-output (MIMO) radar composed of as many active elements as the RIS.
no code implementations • 15 Aug 2022 • Luca Venturino, Emanuele Grossi, Marco Lops, Jeremy Johnston, Xiaodong Wang
In this work, we exploit the radar clutter (i. e., the ensemble of echoes generated by the terrain and/or the surrounding objects in response to the signal emitted by a radar transmitter) as a carrier signal to enable an ambient backscatter communication from a source (tag) to a destination (reader).
no code implementations • 18 May 2022 • Yangming Lai, Luca Venturino, Emanuele Grossi, Wei Yi
In this paper, we consider a distributed multiple-input multiple-output (MIMO) radar which radiates waveforms with non-ideal cross- and auto-correlation functions and derive a novel subspace-based procedure to detect and localize multiple prospective targets.
no code implementations • 3 Feb 2022 • Mohamed Rihan, Emanuele Grossi, Luca Venturino, Stefano Buzzi
Active reconfigurable intelligent surfaces (RISs) are a novel and promising technology that allows controlling the radio propagation environment while compensating for the product path loss along the RIS-assisted path.
no code implementations • 24 Aug 2021 • Jeremy Johnston, Luca Venturino, Emanuele Grossi, Marco Lops, Xiaodong Wang
In this work we consider a multiple-input multiple-output (MIMO) dual-function radar-communication (DFRC) system, which senses multiple spatial directions and serves multiple users.
no code implementations • 19 May 2021 • Stefano Buzzi, Emanuele Grossi, Marco Lops, Luca Venturino
A reconfigurable intelligent surface (RIS) is a nearly-passive flat layer made of inexpensive elements that can add a tunable phase shift to the impinging electromagnetic wave and are controlled by a low-power electronic circuit.
no code implementations • 19 Apr 2021 • Emanuele Grossi, Marco Lops, Luca Venturino
Energy efficiency, possibly coupled with cognition-based and spectrum-sharing architectures, is a key enabling technology for green communications in 5G-and-beyond standards.
no code implementations • 1 Apr 2021 • Stefano Buzzi, Emanuele Grossi, Marco Lops, Luca Venturino
In this work, we consider the target detection problem in a sensing architecture where the radar is aided by a reconfigurable intelligent surface (RIS), that can be modeled as an array of sub-wavelength small reflective elements capable of imposing a tunable phase shift to the impinging waves and, ultimately, of providing the radar with an additional echo of the target.