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Sobre

Sobre

Henrique M. Salgado graduou-se em Física Aplicada (Óptica e Eletrônica) na Universidade do Porto em 1985 e recebeu o grau de doutoramento em Engenharia Eletrónica e Sistemas Informáticos pela University of Wales em 1993. Ingressou no Departamento de Engenharia Elétrica e Informática da Universidade do Porto em 1999 como Professor Auxiliar Convidado e em 2003 tornou-se Professor Associado. Desde 1995 que dirige a área de Óptica e Eletrónica do INESC TEC, sendo responsável por vários projetos de investigação nacionais e internacionais (Europeus) e contratos com a indústria . De 1997 a 1999, foi Investigador Principal no Department of Electrical and Electronic Engineering of the University College London, Reino Unido e anteriormente Investigador Auxiliar na School of Electronic Engineering and Computer Systems, Bangor, Reino Unido. Ele é o autor e co-autor de enúmeras publicações internacionais no campo das comunicações de fibra óptica e microondas. Os seus atuais interesses de pesquisa incluem: tecnologia de rádio sobre fibra e fotónica de microondas, equalização digital em sistemas ópticos coerentes, redes totalmente ópticas, modelação de não-linearidades e projeto de antenas compactas multibanda. Ele é membro da Photonics Society e Communications Society do IEEE.

Tópicos
de interesse
Detalhes

Detalhes

  • Nome

    Henrique Salgado
  • Cargo

    Investigador Sénior
  • Desde

    25 outubro 1985
024
Publicações

2023

Misalignment-Resilient Propagation Model for Underwater Optical Wireless Links

Autores
Araujo, JH; Tavares, JS; Marques, VM; Salgado, HM; Pessoa, LM;

Publicação
SENSORS

Abstract
This paper proposes a multiple-lens receiver scheme to increase the misalignment tolerance of an underwater optical wireless communications link between an autonomous underwater vehicle (AUV) and a sensor plane. An accurate model of photon propagation based on the Monte Carlo simulation is presented which accounts for the lens(es) photon refraction at the sensor interface and angular misalignment between the emitter and receiver. The results show that the ideal divergence of the beam of the emitter is around 15 degrees for a 1 m transmission length, increasing to 22 degrees for a shorter distance of 0.5 m but being independent of the water turbidity. In addition, it is concluded that a seven-lense scheme is approximately three times more tolerant to offset than a single lens. A random forest machine learning algorithm is also assessed for its suitability to estimate the offset and angle of the AUV in relation to the fixed sensor, based on the power distribution of each lens, in real time. The algorithm is able to estimate the offset and angular misalignment with a mean square error of 5 mm (6 mm) and 0.157 rad (0.174 rad) for a distance between the transmitter and receiver of 1 m and 0.5 m, respectively.

2023

Sigma-Delta Modulation for Enhanced Underwater Optical Wireless Communication Systems

Autores
Araújo J.H.; Rocha H.J.; Tavares J.S.; Salgado H.M.;

Publicação
International Conference on Transparent Optical Networks

Abstract
This paper presents an experimental investigation of sigma-delta modulation (SDM) as a means of improving the performance of underwater optical communication systems. The study considers the impact of the key parameters of SDM, including oversampling ratio, the system's signal-to-noise ratio, bandwidth, and optical link distance. The results of this study provide insights into the design and optimization of SDM-based underwater optical communication systems, paving the way for future research in this field. A fully digital solution, albeit operating at a lower bit rate than previously published OFDM counterparts, provides immunity against nonlinearities of the system and robustness to noise, which is relevant in harsh environments. Moreover, the proposed solution based on a first-order bandpass SDM architecture avoids the employment of a DAC at the receiver, simplifying its operation and reducing costs. An experimental investigation is carried out for the transmission of 16-QAM over SDM, and a transmission distance of 4.8 m over the underwater channel is achieved with a maximum transmission rate of 400 Mbit/s with an MER of 28 dB.

2022

Substrate Integrated Waveguide Cavity Backed Slot Antennas for Millimeter-Wave Applications

Autores
Finich, S; Salgado, HM; Pinho, P;

Publicação
2022 16TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)

Abstract
A low-cost single-layer substrate-integrated waveguide (SIW) cavity-backed slot antenna is proposed for millimeter-wave applications. The structure is designed to operate at the W-band. The T-shaped slot antenna is placed on the back-side of the SIW and fed by a grounded coplanar waveguide (GCPW) transmission line. A transition between the (GCPW) and the SIW is also designed. The simulated results provide that the antenna has a stable gain over the frequency range (98.79-100.56) GHz with a maximum value of around 6 dBi also high radiation efficiency.

2022

A Gaussian Window for Interference Mitigation in Ka-band Digital Beamforming Systems

Autores
Tavares, JS; Avelar, HH; Salgado, HM; Pessoa, LM;

Publicação
2022 13th International Symposium on Communication Systems, Networks and Digital Signal Processing, CSNDSP 2022

Abstract
This paper proposes the use of a Gaussian window on the array factor as an interference mitigation method, aiming to avoid the computational complexity of the MVDR algorithm at the cost of a slight performance reduction. We show that by optimizing the parameters of the Gaussian window, it is possible to effectively mitigate the interfering signal if it is received within a certain angular range from the desired signal, while being still effective beyond that range. Finally, we show that the effectiveness of this approach is maintained across the full frequency reception range of the Ka-band, and confirm its validity using 8 × 8 and 16 × 16 array sizes. © 2022 IEEE.

2021

Wide Scanning Angle Millimetre Wave 1 x 4 Planar Antenna Array on InP at 300 GHz

Autores
Hussain, B; Salgado, HM; Pessoa, LM;

Publicação
APPLIED SCIENCES-BASEL

Abstract
Featured Application Short-range millimetre wave communications. The design of a uniformly spaced 1 x 4 linear antenna array using epitaxial layers of benzocyclobutene over an InP substrate is demonstrated. The array elements are conjugately matched with a uni-travelling carrier photodiode at the input. The phased array is optimised to counteract mutual coupling effects by introducing metal strips with isolated ground planes for each radiating element. The proposed antenna array can provide a gain of 10 dBi with a gain variation of +/- 3 dB. The array operates over a bandwidth of 10 GHz (295-305 GHz) with a wide scanning angle of 100 degrees in the broadside.

Teses
supervisionadas

2022

Designing and Building A Microservices-Based Time Series Forecasting System

Autor
João Ruano Neto Veiga de Macedo

Instituição
UP-FEUP

2022

Evaluating the Application of Time Series Forecasting with Confidence Intervals in IoT Self-Healing Systems

Autor
Miguel Delgado Pinto

Instituição
UP-FEUP

2022

High Power Efficiency, Wideband Microwave Power Amplifier Design Using Low-Cost Packaging and Integration Techniques for Emerging Transmitter Systems

Autor
Hassan Safdary

Instituição
UP-FEUP

2022

Constellation shaping in high-speed resilient underwater optical wireless communications

Autor
João Henrique Melro Araújo - Feup

Instituição
UP-FEUP

2022

Desenvolvimento de Uma Antena em Grafeno

Autor
Luís Pedro Silva Ermida Martins de Freitas

Instituição
UP-FEUP