XXXVIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

User equipment (UE) power consumption is a permanent concern for device manufacturers and users, which can be influenced by the network configuration. One of the main settings in LTE systems is carrier aggregation (CA). This paper compares real current measures over recently launched smartphone devices in CA and non-CA scenarios with the latest 3GPP...

Com o crescente número de recursos na IoT, surge o desafio de selecionar o recurso disponível que ofereça melhor Qualidade de Serviço (QoS) ao cliente, considerando suas preferências. Este trabalho tem como objetivo a concepção da proposta IoT-DFR³, que contempla: (i) emprego de Lógica Fuzzy Tipo-2 Intervalar para tratamento de incertezas na definição...

This paper deals with the application of classifiers based on deep neural networks (DNNs) in the discrimination between healthy voice signals and affected by laryngeal pathologies edema, carcinoma, leukoplakia, polyps and vocal fold paralysis. Each voice signal was partitioned into segments, which are inserted in an DNN of 05 hidden layers with 200...

Intelligent reflective surface (IRS) has being envisioned to be the key technology for beyond 5G or 6G systems. Due to the passive nature of the IRS, channel estimation is one of the main challenges in IRS-based communications. In addition, due to hardware constraints, a perfect reflection cannot always be achieved by the IRS. In this paper, we face the...

Coherent optical interconnects with up to 400-Gbps transmission rates and distances exceeding 80 km have been proposed to meet the increasing capacity demand of inter-datacenter communications. The interplay between the fiber Kerr effect and the receiver noise posses an upper-bound to the transmission distance. In this paper, we used numerical...

Os requerimentos cada vez mais exigentes de eficiência espectral estão dando lugar ao estudo de formatos de modulação óptica mais sofisticados que o tradicional on-off keying. Neste contexto, a modulação por deslocamento da polarização (polarization shift keying, PolSK) pode representar uma alternativa em sistemas de baixo custo, pois permite explorar a...

This article proposes alternative fitting for path loss models at 3.5 GHz in a V2I scenario for 5G. The data used here belong to a measurement campaign for Mobile WiMAX characterization, however, the scenario is plainly compatible to a V2I setup for 5G. A polynomial fitting is used, which generates a mathematical model for path loss. New models are more...

In this paper, we introduce a new imaging algorithm for synthetic aperture radar raw-data. This is based on the most compact representation of a chirp signal using the fractional Fourier transform. Pulse compression in range, azimuth and range cell migration correction are obtained only from the rawdata, unlike methods documented in the literature, there...

Elastic optical networks (EONs) have been target of recent studies because of their ability to transmit data with different bandwidths, adapted to the demand. As a promising approach to implement optical network, techniques and heuristics have been presented for EON in order to explore their benefits and find solutions for their problems, including the...

MIMO (multiple-input multiple-output) wireless communication systems play a fundamental role in 5G communications and beyond. This work describes the development of an open source Python library aimed to assist students and researchers in the study of 5G MIMO systems. Its current version includes the ability to estimate the capacity of a MIMO channel for...