12 papers
Variational Bayesian Tensor Decomposition With Discrete Mixture Prior for Unsourced Random Access
Ala Baccar, Alexis Decurninge, Alberto Rech +3
Tensor-based modulation (TBM) schemes are a promising approach for unsourced random access (URA), where user separation relies on decomposing the received signal tensor via the can…
Tensor-based Random Access for Ambient IoT Contention Resolution
Alberto Rech, Alexis Decurninge, Ala Baccar +1
Ambient Internet of Things (A-IoT) deployments impose stringent hardware constraints, including low-order modulations and simple transceiver architectures. We propose a tensor-base…
Scheduling for Downlink OFDMA With IRS Reconfiguration Constraints
Alberto Rech, Leonardo Badia, Stefano Tomasin
The technical limitations of the intelligent reflecting surface (IRS) (re)configurations in terms of both communication overhead and energy efficiency must be considered when IRSs…
Minimum-Latency Scheduling For Partial-Information Multiple Access Schemes
Alberto Rech, Stefano Tomasin, Lorenzo Vangelista +1
Partial-information multiple access (PIMA) is an orthogonal multiple access (OMA) uplink scheme where time is divided into frames, each composed of two parts. The first part is use…
Semi-Grant-Free Orthogonal Multiple Access with Partial-Information for Short Packet Transmissions
Alberto Rech, Stefano Tomasin, Lorenzo Vangelista +1
Next-generation internet-of-things (IoT) networks require extremely low latency, complexity, and collision probability. We introduce the novel partial-information multiple access (…
Downlink Clustering-Based Scheduling of IRS-Assisted Communications With Reconfiguration Constraints
Alberto Rech, Matteo Pagin, Leonardo Badia +4
Intelligent reflecting surfaces (IRSs) are being widely investigated as a potential low-cost and energy-efficient alternative to active relays for improving coverage in next-genera…
Unsourced Random Access With Tensor-Based and Coherent Modulations
Alberto Rech, Alexis Decurninge, Luis G. Ordóñez
Unsourced random access (URA) is a particular form of grant-free uncoordinated random access wherein the users' identities are not associated to specific waveforms at the physical…
Partial-Information Multiple Access Protocol for Orthogonal Transmissions
Alberto Rech, Stefano Tomasin, Lorenzo Vangelista +1
With the stringent requirements introduced by the new sixth-generation (6G) internet-of-things (IoT) use cases, traditional approaches to multiple access control have started to sh…
Downlink TDMA Scheduling for IRS-aided Communications with Block-Static Constraints
Alberto Rech, Matteo Pagin, Stefano Tomasin +5
Intelligent reflecting surfaces (IRSs) are being studied as possible low-cost energy-efficient alternatives to active relays, with the goal of solving the coverage issues of millim…
End-to-End Simulation of 5G Networks Assisted by IRS and AF Relays
Matteo Pagin, Marco Giordani, Amir Ashtari Gargari +5
The high propagation and penetration loss experienced at millimeter wave (mmWave) frequencies requires ultra-dense deployments of 5th generation (5G) base stations, which may be in…
Coordinated Random Access for Industrial IoT With Correlated Traffic By Reinforcement-Learning
Alberto Rech, Stefano Tomasin
We propose a coordinated random access scheme for industrial internet-of-things (IIoT) scenarios, with machine-type devices (MTDs) generating sporadic correlated traffic. This occu…
Maximum-Rate Optimization of Hybrid Intelligent Reflective Surface and Relay Systems
Alberto Rech, Federico Moretto, Stefano Tomasin
We consider a wireless communication system, where a transmitting source is assisted by both a reconfigurable intelligent reflecting surface (IRS) and a decode-and-forward half-dup…