XLI Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

Este artigo propõe modelos de fatias de rede (NSTs - Network Slice Templates) para redes 5G para diferentes cenários de uso da rede definidos pelo IMT-2020: eMBB (enhanced Mobile BroadBand), URLLC (Ultra Reliable Low Latency Communications) e mMTC (massive Machine-Type Communications). Simula- se uma rede 5G sob o modelo NST proposto para o cenário eMBB...

Time Sensitive Networking (TSN) provides high performance deterministic communication using time scheduling. In theory, the rigor of a TSN schedule is the key to achieving deterministic communication; however, real devices are prone to errors. TSN-based applications require both fault-tolerance and end-to-end latency guarantee. This paper identifies the...

This work presents a preliminary study of the communication architecture for the BiomeSat nano-satellite of the National Institute for Space Research (INPE). The project includes the provision of up to four onboard payloads, which requires an adequate dimensioning of the communication system, as well as simulations of the positioning of the antennas in...

Este artigo apresenta o projeto de um divisor de potência Wilkinson baseado em elementos concentrados. Para este projeto, foi utilizado o software Ansys HFSS para simular o comportamento eletromagnético do divisor. A frequência central de operação do dispositivo é 2,4 GHz, visando à aplicação em um circuito de beamforming, que será embarcado em veículo...

This work investigates interference mitigation techniques in multi-user multiple input multiple output (MU-MIMO) Intelligent Reflecting Surface (IRS)-aided networks, focusing on the base station end. Two methods of precoder design based on block diagonalization are proposed. The first method does not consider the interference caused by the IRS, seeking...

This paper proposes a tensor-based parametric modeling and estimation framework in MIMO systems assisted by intelligent reflecting surfaces (IRSs). We present two algorithms that exploit the tensor structure of the received pilot signal to estimate the concatenated channel. The first one is an iterative solution based on the alternating least squares...

The increasing demand for higher rates and uniformity of rates among users has given rise to one new system in which the user is served by more than one Access Point. In such systems, one challenge is to find the optimal cluster of Access Points to serve the user. One way of doing that has been proposed by greedy pilot assignment and clustering, however...

This work presents a methodology to achieve pulses with reduced intersymbol interference (ISI) and with improved data transmission performance. The designed pulses are obtained through the use of the prolate spheroidal wave functions (PSWF). An optimization problem is formulated to achieve maximum time-concentrated pulses and to ensure that they are...

In this work, a new combined feature is proposed to improve the recognition of non-stationary acoustic sources. The idea is to overcome the non-stationarity problem on classification tasks due to mismatches that arise from natural statistics variations. The Index of Non-Stationarity (INS) is adopted to assess the non-stationarity behavior of acoustic...

Este artigo apresenta a aplicação da teoria de fractais em um transformador de impedância do tipo Klopfenstein em microfita para a faixa de frequências de 500 MHz e acima visando a redução do seu tamanho, utilizando o substrato FR-4 de espessura de 1,6 mm. Para validar o estudo, foram simulados através do software CST e construídos três transformadores...