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Communication Systems

Title: SeMOVER - Security for Networked Vehicle Mobility.

Team: Prof. Evelio M. García Fernández.
Abstract: This project aims to promote academic and scientific cooperation between the Graduate Program in Electrical Engineering at UFPR and the Master's program in International Automotive Engineering from Technische Hochschule Ingolstadt (THI), Germany. It is intended to increase the robustness of pedestrian recognition through a system composed of four sensors with short range and increased bandwidth, considering the microDoopler effect. Secondly, it is intended to evaluate the impact of radio propagation models on the performance of cooperative vehicular networks. These objectives will be achieved through the insertion of master students in the CARISSMA research center of THI.

Title: Multipath communication in packet networks.

Team: Prof. Eduardo Parente Ribeiro.
Abstract: Computers and mobile devices often have more than one internet connection, a condition called multihome. The careful choice of the exit route for each destination can improve communication performance. It is proposed to study communication methods by multiple paths in an intelligent and controlled way without the need to exchange information about routes with the routing protocols.

Title: Networked Control Systems (NCS).

Team: Prof. Eduardo Parente Ribeiro.
Abstract: Networked Control Systems (NCS) present advantages and flexibility with data communication in wired or wireless networks over conventional hardwired digital or analog control systems. However, packet delay and loss can influence the stability and performance of these systems. This project aims to study these effects as well as to propose and analyze solutions that minimize degradation and improve the operation of networked control systems in adverse situations.
Keywords: feedback control, packet networks, wireless networks, control systems.

Title: Software Defined Networks - SDN.

Team: Prof. Eduardo Parente Ribeiro.
Abstract: Software defined networking - SDN constitutes a new architectural paradigm to obtain more flexibility and efficiency in the provision of communication services. It is based on decoupling the data plan and control plan allowing the network to be directly reconfigurable and network functions to be easily virtualized. An important standard currently used is the openflow protocol that defines the communication between the controller and the network elements (switches). This project aims to evaluate the gains provided by this architecture as well as to research innovations that allow to improve scalability and performance of this approach.

Title: Reconfigurable wireless communications systems based on discrete-time signal processing and with spectral recognition: New architectures, modulations, and spectral sensing.

Team: Prof. Luis Henrique Assumpção Lolis.
Abstract: This project aims at exploring new techniques to increase capacity, flexibility, and robustness towards noise/distortion in wireless communications systems. This work is divided into three axes: Frequency conversion circuits and systems for radiofrequency transceivers based on N-path filters, mixer-first, or other switched-capacitor techniques; study on the relations between new modulation schemes, error correction codes, and Massive MIMO algorithms the next-generation mobile communication systems; and the study of new spectral sensing and modulation classification strategies, focused on the implementation for cognitive radio. About the frequency conversion circuits and systems, it is expected to point out discrete-time architectures adapted for each scenario, to cite: high throughput and bandwidth, high energy efficiency, high flexibility between bandwidths, and communication standards. Architectures that perhaps present novelty in discrete-time signal processing can be implemented in Solid-State Circuits through partner projects. About the study on the relations between new modulation schemes, error correction codes, and Massive MIMO algorithms the next-generation mobile communication systems, it is expected to evaluate how different modulations and multiple access interact in a Massive MIMO scenario concerning the spectral and energy efficiency and robustness towards noise distortion. Modulations such as FBMC and nonoptimal linear combiners are the starting point for this project's axis. About the new strategies on spectral sensing and modulation classification, the focus is to implement in digital circuits, dedicated or general-purpose metrics calculators, neural networks, and new algorithms for sensing and modulation classification. The digital circuits are implemented in VHDL, being validated with an FPGA for posterior fabrication in an ASIC. The implementation in a processor is done through DSPs.

Title: Physical Layer Security Applied to Hybrid Communication Systems.

Team: Prof. Ândrei Camponogara.
Abstract: This research project aims at investigating the physical layer security (PLS) of a broadband power line communication (PLC) system when malicious wireless communication (WLC) devices overhear private information exchanged between two PLC devices from this system. Such WLC devices, when close to the PLC system and operating in the same frequency band, can sense part of the electromagnetic field radiated by the PLC signal traveling over unshielded power cables. Note that those WLC devices can cooperate to obtain an advantage in decoding the collected confidential information. Moreover, this research project investigates the PLS in hybrid PLC/WLC systems when a malicious hybrid PLC/WLC device eavesdrops on private messages exchanged between two legitimate hybrid PLC/WLC devices from this system. Observe that hybrid PLC/WLC systems make use of a parallel combination between PLC and WLC channels to perform data communication. It is noteworthy that the malicious WLC and hybrid PLC/WLC devices are assumed to be passive, i.e., the transmitter does not have knowledge of their channel state information (CSI). To study the PLS in PLC and hybrid PLC/WLC systems, a measurement campaign is considered for obtaining estimates of PLC, hybrid PLC-WLC (channel related to the PLC signal radiated into the air), and WLC channels. Note that these channel estimates allow the assessment of practical scenarios for PLS. After the characterization of these channel estimates and the evaluation of PLS using the collected data, the objective is the development of methods capable of guaranteeing security at the physical layer in broadband PLC and narrowband and broadband hybrid PLC/WLC systems.
Keywords: Physical layer security, power line communication, wireless communication.

Microwaves and Applied Electromagnetism

Title: Highly efficient transmitters for wireless communication systems.

Team: Prof. Eduardo Gonçalves de Lima.
Abstract: :This project is dedicated to the two most relevant themes for the design of transmitters for modern wireless communication systems: the search for new transmitter architectures, capable of keeping the transmitter operating at high efficiency in a wide range of output power; and the linearization of transmitters, to explore the operation of transmitters in the range of high efficiency and, at the same time, meet the strict requirements of linearity.

Title: CMOS RF power amplifiers and integrated transformers.

Team: Prof. Bernardo R. B. de Almeida Leite.
Abstract: The development of this research project includes the the design and simulation of CMOS RF power amplifiers using dedicated software and their experimental characterization. The designed PAs will target high linearity and efficiency levels, focusing on reconfigurable and adaptive behaviors. Moreover, an important part of the work consists on the design, electromagnetic simulation and characterization of integrated transformers and transformer-based structures, such as power combiners.

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