XLIV Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

Known-waveform (KW) direction-of-arrival estimators exploit a known reference signal to improve spatial selectivity, but their practical performance depends on operating conditions that have not been systematically quantified. This paper provides a rigorous simulation-backed characterization of three such conditions: interferer modulation format,...

This paper presents initial implementations and experimental validations of an Automatic Identification System (AIS) transceiver based on Software-Defined Radio (SDR) and GNU Radio. The proposed platform enables the generation, transmission, reception, and decoding of AIS message type 1 in a controlled laboratory environment using two NI 2901 SDR...

This paper proposes a parameter estimation scheme for uplink MIMO systems assisted by a Hybrid Reconfigurable Intelligent Surface (HRIS). To reduce hardware complexity, the HRIS employs a small number of active elements arranged in a sparse coprime geometry for local sensing, while the remaining elements passively reflect signals. This simultaneous...

O-RAN has emerged as a promising architecture for scalable mobile networks, however, its disaggregation into VNFs poses significant challenges in orchestrating these distributed units. This work proposes a unified framework for the joint optimization of UE/O-RU association and O-DU and O-CU placement, considering QoS requirements of multiple network...

The growing use of LLMs by students as a substitute for textbooks introduces important pedagogical challenges. Many LLM-generated answers do not follow the notation, methodology, or conceptual approach adopted by instructors, and may even contain errors. This shifts educational influence from professors to Big Tech platforms that define model behavior...

Visual Microphone enables passive acoustic recovery from subtle object vibrations captured in video sequences. Conventional approaches rely on multiscale phase decompositions with high computational cost. This work proposes a structural dynamics Visual Microphone framework operating directly on vectorized temporal pixel signals, avoiding phase based...

Industry 4.0 demands high reliability and ultra-low latency communications. Although 5G's Ultra-Reliable Low-Latency Communications (URLLC) meets these requirements, native support for Industrial Ethernet protocols over 5G via Ethernet-type PDU sessions remains unavailable. In this context, this paper proposes and validates an encapsulation technique...

Flexible Intelligent Metasurfaces (FIMs) enable wireless systems to adapt their three-dimensional geometry through morphing, thereby providing new spatial degrees of freedom. However, continuous deformation complicates the accurate acquisition of Channel State Information (CSI). This work proposes a multidimensional framework for MIMO systems with active...

Este trabalho avalia o potencial discriminativo de medidas acústicas para detecção do Transtorno Depressivo Maior, em mulheres jovens e idosas, por meio da fala. Foram analisadas oito medidas relacionadas à prosódia, qualidade vocal e parâmetros cepstrais. Após remoção automática de pausas, as características acústicas foram extraídas e submetidas a...

This paper reports an experimental analysis of using radio over fiber (RoF) technology, based on external modulation, to improve performance of on-channel repeater (OCR) systems aimed for digital television (DTV) broadcasting. Such approach mitigates interference from coupling loop wave commonly found in OCRs. It is protocol-independent, requires no...