258 documents found, page 1 of 26
360 Health Analysis (H360) — a comparison of key performance indicators in brea...
Rego, Inês Brandão; Coelho, Sara; Semedo, Patrícia Miguel; Cavaco-Silva, Joana; Teixeira, Laetitia; Sousa, Susana; Reis, Joana; Dinis, RuiBackground: The increased focus on quality indicators (QIs) and the use of clinical registries in real-world cancer studies have increased compliance with therapeutic standards and patient survival. The European Society of Breast Cancer Specialists (EUSOMA) established QIs to assess compliance with current standards in breast cancer care. Methods: This retrospective study is part of H360 Health Analysis and aim...
On the Performance of LDPC-Coded Large Intelligent Antenna System
Gashtasbi, Ali; Silva, Mário Marques da; Dinis, Rui; Guerreiro, João
A review on cell-free massive MIMO systems
Kassam, Joumana; Castanheira, Daniel; Silva, Adão; Dinis, Rui; Gameiro, AtílioCell-free massive multiple-input multiple-output (CF mMIMO) can be considered as a potential physical layer technology for future wireless networks since it can benefit from all the advantages of distributed antenna systems (DASs) and network MIMOs, such as macro-diversity gain, high channel capacity, and link reliability. CF mMIMO systems offer remarkable spatial degrees of freedom and array gains to mitigate ...
Joint Decoding and UE-APs Association for Scalable Cell-Free Systems
Kassam, Joumana; Castanheira, Daniel; Silva, Adão; Dinis, Rui; Gameiro, AtílioUser-centric cell-free massive multiple-input multiple-output (UC CF mMIMO) is a key technology for 6G. In UC CF mMIMO each user equipment (UE) is jointly served by a small subset of a large set of cooperating access points (APs). The APs are connected through the fronthaul to a central unit (CU) for joint processing. The key to efficiency is the UE-APs association procedure together with the APs/CU cooperative...
Bi-Objective Power Optimization of Radio Stripe Uplink Communications
Conceição, Filipe; Gomes, Marco; Silva, Vitor; Dinis, Rui; Antunes, Carlos HenggelerThe radio stripe (RS) system is a practical implementation of cell-free mMIMO, in which a set of multi-antenna access points (APs) serves at the same time-frequency resources the user equipment (UE) in the network. The APs are sequentially connected in a stripe, sharing the same fronthaul link to the central processing unit. This work considers an uplink power optimization problem that aims to enhance the netwo...
Instrumental methods as strategic supporting tools for systematic biochemical a...
Oliveira, Jorge; Lemos, Carlota; Brito, Manuel; Pinto, António; Coutinho, Rui Coutinho; Barracosa, Paulo; Coelho, Catarina; Dinis, RuiSerra da Estrela sheep crude milk is mandatory for the PDO Serra da Estrela (SE) cheese production. The production system implies the need for systematic knowledge of the values of useful matter (fat and protein) to produce cheese. The knowledge of somatic cell count (SCC) allows to predict the mammary health status of ewes as well as make decisions on the use of crude milk for human consumption, through its tr...
IRS, LIS, and Radio Stripes-Aided Wireless Communications: A Tutorial
Gashtasbi, Ali; Silva, Mário Marques da; Dinis, RuiThis is a tutorial on current techniques that use a huge number of antennas in intelligent re‑ flecting surfaces (IRS), large intelligent surfaces (LIS), and radio stripes (RS), highlighting the similar‑ ities, differences, advantages, and drawbacks. A comparison between IRS, LIS, and RS is performed in terms of the implementation and capabilities, in the form of a tutorial. We begin by introducing the IRS, LIS...
On the Performance of LDPC-Coded MIMO Schemes for Underwater Communications Usi...
Silva, Mário Marques da; Dinis, Rui
Uavnoma: A UAV-NOMA Network Model under Non-Ideal Conditions
Lima, Brena; Fachada, Nuno; Dinis, Rui; Costa, Daniel Benevides da; Beko, MarkoUavnoma is a set of Python functions and a front-end script for modeling, studying, and analyzing the communication system composed by an unmanned aerial vehicle (UAV) and two ground users. We assume that the UAV acts as an aerial base station to serve the users according to non-orthogonal multiple access (NOMA) principles. For more practical insights, residual hardware impairments (RHI) and imperfect successiv...
Hybrid multiuser equalizer with nonlinearity compensation for wideband mmWave m...
Castanheira, Daniel; Magueta, Roberto; Pedrosa, Pedro; Adão Silva; Dinis, Rui; Gameiro, AtílioThe use of efficient high-power amplifiers (HPAs) is critical for future millimeter-wave (mmWave) systems. HPAs can become highly nonlinear when operated near saturation, distorting the transmission signal. Therefore, the design of efficient solutions to mitigate nonlinear distortion (NLD) is of paramount importance. This article proposes a hybrid multiuser equalizer for the uplink of wideband mmWave massive MI...