67 citations · 334 across the 53 of their papers we have counts for
21 papers · 1 filter
Uplink Multiplexing of eMBB/URLLC Services Assisted by Reconfigurable Intelligent Surfaces
João Henrique Inacio de Souza, Victor Croisfelt, Radosław Kotaba +2
This letter proposes a scheme assisted by a reconfigurable intelligent surface (RIS) for efficient uplink traffic multiplexing between enhanced mobile broadband (eMBB) and ultra-re…
Machine Learning-based Methods for Joint {Detection-Channel Estimation} in OFDM Systems
Wilson de Souza Junior, Taufik Abrao
In this work, two machine learning (ML)-based structures for joint detection-channel estimation in OFDM systems are proposed and extensively characterized. Both ML architectures, n…
Improving Spectral Efficiency via Pilot Assignment and Subarray Selection Under Realistic XL-MIMO Channels
Gabriel Avanzi Ubiali, Taufik Abrao, Jose Carlos Marinello
The main requirements for 5G and beyond connectivity include a uniform high quality of service, which can be attained in crowded scenarios by extra-large MIMO (XL-MIMO) systems. An…
NOMA-aided double RIS under Nakagami-m fading: Channel and System Modelling
Wilson de Souza Junior, Taufik Abrao
We investigate the downlink outage performance of double-RIS-aided non-orthogonal multiple access (NOMA), where a near-BS and a near-users RISs setup are deployed. To extend the co…
Improving Random Access with NOMA in mMTC XL-MIMO
Thiago Augusto Bruza Alves, Taufik Abrao
The extra-large multiple-input multiple-output (XL-MIMO) architecture has been recognized as a technology for supporting the massive MTC (mMTC), providing very high-data rates in h…
Reconfigurable Intelligent Surfaces to Enable Energy-Efficient IoT Networks
João Henrique Inacio de Souza, José Carlos Marinello Filho, Taufik Abrão +1
In this article, we study the uplink (UL) channel of a cellular network of Internet of Things (IoT) devices assisted by a reconfigurable intelligent surface (RIS) with a limited nu…
Energy Efficiency and Throughput of Random Access Protocols for RIS-Aided IoT Networks
João Henrique Inacio de Souza, José Carlos Marinello Filho, Taufik Abrão +1
Green Internet of Things (IoT) aims to enable a sustainable smart world by making energy efficiency (EE) the main performance indicator for IoT hardware and software. With respect…
Randomized Control of Wireless Temporal Coherence via Reconfigurable Intelligent Surface
João Henrique Inacio de Souza, Victor Croisfelt, Fabio Saggese +2
A reconfigurable intelligent surface (RIS) can shape the wireless propagation channel by inducing controlled phase shift variations to the impinging signals. Multiple works have co…
Massive MIMO and NOMA Bits-per-Antenna Efficiency under Power Allocation Policies
Thiago Alves Bruza Alves, Taufik Abrão
A comparative resource allocation analysis in terms of received bits-per-antenna spectral efficiency (SE) and energy efficiency (EE) in downlink (DL) single-cell massive multiple-i…
QoS-Aware User Scheduling in Crowded XL-MIMO Systems Under Non-Stationary Multi-State LoS/NLoS Channels
Joao Henrique Inacio de Souza, Jose Carlos Marinello, Abolfazl Amiri +1
Providing minimum quality-of-service (QoS) in crowded wireless communications systems, with high user density, is challenging due to the network structure with limited transmit pow…
RIS-aided Cooperative FD-SWIPT-NOMA Outage Performance in Nakagami-m Channels
Wilson de Souza Junior, Taufik Abrao
In this work, we investigate reconfigurable intelligent surfaces (RIS)-assisted cooperative non-orthogonal multiple access (C-NOMA) consisting of two paired users, where the phases…
Decentralized Design of Fast Iterative Receivers for Massive and Extreme-Large MIMO Systems
Victor Croisfelt, Taufik Abrão, Abolfazl Amiri +2
Despite the extensive use of a centralized approach to design receivers at the base station for massive multiple-input multiple-output (M-MIMO) systems, their actual implementation…
Exploring the Non-Overlapping Visibility Regions in XL-MIMO Random Access Protocol
José Carlos Marinello Filho, Glauber Brante, Richard Demo Souza +1
The recent extra-large scale massive multiple-input multiple-output (XL-MIMO) systems are seen as a promising technology for providing very high data rates in increased user-densit…
User-Centric Perspective in Random Access Cell-Free Aided by Spatial Separability
Victor Croisfelt, Taufik Abrão, José Carlos Marinello
In a cell-free massive multiple-input multiple-output (CF-mMIMO) network, multiple access points (APs) actively cooperate to serve users' equipment (UEs). We consider how the rando…
Mixed Gibbs Sampling Detector in High-Order Modulation Large-Scale MIMO Systems
Alex Mussi, Taufik Abrão
A neighborhood restricted Mixed Gibbs Sampling (MGS) based approach is proposed for low-complexity high-order modulation large-scale Multiple-Input Multiple-Output (LS-MIMO) detect…
Quasi-Distributed Antenna Selection for Spectral Efficiency Maximization in Subarray Switching XL-MIMO Systems
Joao Henrique Inacio de Souza, Abolfazl Amiri, Taufik Abrao +2
In this paper, we consider the downlink (DL) of a zero-forcing (ZF) precoded extra-large scale massive MIMO (XL-MIMO) system. The base-station (BS) operates with limited number of…
Accelerated Randomized Methods for Receiver Design in Extra-Large Scale MIMO Arrays
Victor Croisfelt Rodrigues, Abolfazl Amiri, Taufik Abrão +2
Massive multiple-input-multiple-output (M-MIMO) features a capability for spatial multiplexing of large number of users. This number becomes even more extreme in extra-large (XL-MI…
Massive MIMO for Internet of Things (IoT) Connectivity
Alexandru-Sabin Bana, Elisabeth de Carvalho, Beatriz Soret +4
Massive MIMO is considered to be one of the key technologies in the emerging 5G systems, but also a concept applicable to other wireless systems. Exploiting the large number of deg…
Pilot Distribution Optimization and Power Control in Multi-Cellular Large Scale MIMO Systems
Jose Carlos Marinello, Taufik Abrao
Massive MIMO communication systems have been identified as one of the most prominent technologies of the next generation wireless standards, such as 5G, due to the large gains in e…
Energy efficient OFDMA networks maintaining statistical QoS guarantees for delay-sensitive traffic
Taufik Abrão, Lucas D. H. Sampaio, Shaoshi Yang +3
An energy-efficient design is proposed under specific statistical quality-of-service (QoS) guarantees for delay-sensitive traffic in the downlink orthogonal frequency-division mult…
Error-Correcting Codes for Reliable Communications in Microgravity Platforms
Décio L. Gazzoni Filho, Taufik Abrão, Marcelo C. Tosin +1
The PAANDA experiment was conceived to characterize the acceleration ambient of a rocket launched microgravity platform, specially the microgravity phase. The recorded data was tra…