XLIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

We evaluate the design of an unrepeatered optical system based on the simultaneous optimization of its transmission, reception, and amplification parameters by a neural network algorithm (NNA), aiming at maximizing the achieved mutual information (MI). After transmission system design, the probabilistic shaping (PS) method applying the Maxwell-Boltzmann...

This work proposes a method for estimating the Q-factor from surface reflection data by formulating an inverse problem based on the convolutional model. The approach is flexible, allowing easy substitution of different attenuation models within the same framework. The Q-factor is estimated by minimizing a mean square error cost function using gradient...

This paper presents a proof of concept on dynamically slicing a 5G network using TC and eBPF for granular Quality of Service (QoS). The approach ensures appropriate bandwidth for each slice based on near real-time traffic inspection and classification. eBPF handles packet inspection and classification using the Hierarchical Token Bucket (HTB) queuing...

We propose a method to enhance Bluetooth Low Energy (BLE) angle of arrival (AoA) estimation using the multiple signal classification (MUSIC) algorithm as a base estimator. In order to identify and remove outliers that jeopardize the accuracy performance, the proposed algorithm employs a sliding window median filter, which is compared to an adjustable...

Radio propagation prediction is a fundamental stage in mobile communication systems design and improvement. That prediction is based on propagation models often developed from empirical measurements. That is a complex process, which has recently been boosted by several machine learning and artificial intelligence tools. Among those techniques, symbolic...

Este artigo investiga a alocação de recursos no uplink de redes sem fio com comunicações dispositivo-para-dispositivo (D2D) em um cenário de compartilhamento múltiplo. É proposto um algoritmo de alocação de recursos que otimiza a potência alocada aos dispositivos de modo a maximizar vazão e busca reduzir o retardo utilizando conceitos de Cálculo de Rede,...

This work investigates protection schemes in User Centric (UC) distributed massive MIMO (D-mMIMO) networks with serial fronthaul connections under limited capacity, using dynamic bit allocation and different precoding techniques. The study evaluates the impact of failures, protection schemes, performance degradation, and operational costs across various...

This paper presents an automated classifier for translucency images of fertile and commercial eggs, based on machine learning methods. Translucency analysis is utilized for the evaluation of shell quality, which can be correlated with nutritional, sanitary, and management aspects. A comparison among different machine learning strategies, on the largest...

A localização onde os usuários acessam uma rede móvel pode afetar significativamente o desempenho dessa rede. Neste artigo, são aplicados modelos de propagação que dependem da posição do usuário para avaliar o desempenho de uma rede móvel sem fio, com o objetivo de representar de forma mais precisa o comportamento das redes reais. Utilizam-se dados e...

Este artigo propõe abordar a equalização de canais como um problema de separação cega de fontes através do Single Channel ICA. O problema é estendido para o caso não linear através do modelo Post-Nonlinear de misturas. Para a solução do problema, algoritmos bioinspirados são usados para recuperar a etapa não-linear da mistura, enquanto o FastICA é usado...