XLIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

Quantum key distribution allows the distribution of a secret key with applications to cryptography. Specially, continuous variable quantum key distribution presents some advantages over its discrete counterpart and involves a reconciliation protocol where the continuous variable must be transformed to a binary sequence common to both trusted parties....

The orthogonal time frequency space (OTFS) scheme has been considered a promising technique to deal with high Doppler scenarios, where inter-user and inter-symbol interference are significant. Studying the low Earth orbit (LEO) satellite systems, in this work we propose a DD multi-feedback successive interference cancellation (DD-MF-SIC) detector with...

This paper presents GVNF-P, a genetic-algorithm framework that minimises energy consumption while placing Virtual Network Functions (VNFs) for service function chains in beyond-5G (B5G) cloud networks. The algorithm encodes SFC order within chromosomes, leverages a server-centred power model that separates static and dynamic costs, and employs...

Poor traffic sign conditions compromise road safety and due to the huge dimensions of the road network, its manual inspection is an expensive and time consuming task. This work demonstrates the use of the YOLO (You Look Only Once) algorithm for automated detection and classification of Brazilian traffic signs. An initial model was trained on a small...

This paper presents an Index Modulation-enabled Orthogonal Chirp Division Multiplexing (IM-OCDM) waveform tailored for integrated sensing and communication (ISAC) in future 6G networks. The proposed approach leverages inactive subchirps to transmit Linear Frequency Modulated (LFM) radar signals, enabling dual functionality without requiring additional...

This work investigates the performance of a cell-free multiple-input multiple-output (MIMO) system with dynamic time division duplex (D-TDD), in which user-centric clustering algorithms are introduced as an additional stage to dynamically allocate access points (APs) at each time slot. This additional step enables an AP to simultaneously serve multiple...

This paper aims to provide a simple greedy solution for a user-centric clustering scheme in the joint precoding problem for indoor RIS-aided cell-free scenarios, where each user is matched with a group of APs and a group of RISs. For this, a non-convex joint precoding problem is solved following methods available in the literature, where we add a...

Neste artigo é proposto um algoritmo de amostragem para redes de difusão adaptativas em ambientes com ruído impulsivo. Baseado no critério da máxima correntropia (maximum correntropy criterion -- MCC), o algoritmo proposto busca manter os nós amostrados quando o MCC é baixo e deixa de amostrá-los caso contrário, reduzindo significativamente o custo...

Contrary to previous mobile networks, 5G architecture is service based and utilize Network Functions (NFs) to manage connectivity, security, data management, and other functionalities of the network. This kind of architecture allow 5G networks to be more scalable, flexible and eficient than the legacy networks, however, service based networks also...

Este trabalho propõe um método de detecção automática da posição de vagas de estacionamento utilizando técnicas de visão computacional, reduzindo a necessidade de intervenção humana para tal. Baseado no modelo YOLOv8 e no agrupamento DBSCAN, avaliamos a capacidade de identificar automaticamente espaços ocupados e livres em imagens reais obtidas do...