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Publications

Publications by CTM

2019

Resonant tunneling diode photodetectors for optical communications

Authors
Watson, S; Zhang, WK; Tavares, J; Figueiredo, J; Cantu, H; Wang, J; Wasige, E; Salgado, H; Pessoa, L; Kelly, A;

Publication
Microwave and Optical Technology Letters

Abstract
Optical modulation characteristics of resonant tunneling diode photodetectors (RTD-PD) are investigated. Intensity modulated light excites the RTD-PDs to conduct data experiments. Simple and complex data patterns are used with results showing data rates up to 80 and 200 Mbit/s, respectively. This is the first demonstration of complex modulation using resonant tunneling diodes. © 2019 The Authors. Microwave and Optical Technology Letters published by Wiley Periodicals, Inc.

2019

An FPGA-Oriented Baseband Modulator Architecture for 4G/5G Communication Scenarios

Authors
Ferreira, ML; Ferreira, JC;

Publication
ELECTRONICS

Abstract
The next evolution in cellular communications will not only improve upon the performance of previous generations, but also represent an unparalleled expansion in the number of services and use cases. One of the foundations for this evolution is the design of highly flexible, versatile, and resource-/power-efficient hardware components. This paper proposes and evaluates an FPGA-oriented baseband processing architecture suitable for communication scenarios such as non-contiguous carrier aggregation, centralized Cloud Radio Access Network (C-RAN) processing, and 4G/5G waveform coexistence. Our system is upgradeable, resource-efficient, cost-effective, and provides support for three 5G waveform candidates. Exploring Dynamic Partial Reconfiguration (DPR), the proposed architecture expands the design space exploration beyond the available hardware resources on the Zynq xc7z020 through hardware virtualization. Additionally, Dynamic Frequency Scaling (DFS) allows for run-time adjustment of processing throughput and reduces power consumption up to 88%. The resource overhead for DPR and DFS is residual, and the reconfiguration latency is two orders of magnitude below the control plane latency requirements proposed for 5G communications.

2019

Dynamic Partial Reconfiguration of Customized Single-Row Accelerators

Authors
Cardanha Paulino, NM; Ferreira, JC; Cardoso, JMP;

Publication
IEEE Trans. VLSI Syst.

Abstract

2019

Dynamic Partial Reconfiguration of Customized Single-Row Accelerators

Authors
Paulino, NMC; Ferreira, JC; Cardoso, JMP;

Publication
IEEE Transactions on Very Large Scale Integration (VLSI) Systems

Abstract

2019

Teaching inhalation technique in COPD outpatients: Can a sustained improvement be achieved?

Authors
Duarte de Araujo, A; Teixeira, P; Hespanhol, V; Correia de Sousa, J;

Publication
PULMONOLOGY

Abstract

2019

YouTube timed metadata enrichment using a collaborative approach

Authors
Pinto, JP; Viana, P;

Publication
Advances in Intelligent Systems and Computing

Abstract
Although the growth of video content in online platforms has been happening for some time, searching and browsing these assets is still very inefficient as rich contextual data that describes the content is still not available. Furthermore, any available descriptions are, usually, not linked to timed moments of content. In this paper, we present an approach for making social web videos available on YouTube more accessible, searchable and navigable. By using the concept of crowdsourcing to collect the metadata, our proposal can contribute to easily enhance content uploaded in the YouTube platform. Metadata, collected as a collaborative annotation game, is added to the content as time-based information in the form of descriptions and captions using the YouTube API. This contributes for enriching video content and enabling navigation through temporal links. © Springer Nature Switzerland AG 2019.

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