Andre Barbosa

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This paper complements its companion paper by reporting the key experimental results obtained both in the laboratory and via satellite, using the Satellite Universal Mobile Telecommunication Systems (S-UMTS) Advanced TestBed (ATB)—a comprehensive facility developed under a European Space Agency contract whose intention was to demonstrate a set of technical(More)
Iris recognition is a popular technique for recognizing humans. However, as is the case with most biometric traits, it is difficult to collect data that are suitable for use in experiments due to three factors: 1) the substantial amount of data that is required; 2) the time that is spent in the acquisition process; and 3) the security and privacy concerns(More)
The transmission of multimedia content between mobile devices is increasingly an area of exploration. The evolution of mobile devices and networks that support them, provide potential to create more sophisticated and innovating services. The fact that the Android platform does not provide the SIP protocol in its architecture, is a limiting factor for the(More)
This paper presents a digital implementation of the modulation technique based on the PD-PWM using a FPGA (Field Programmable Gate Array) with its logical structure developed through the VHDL language. The technique uses a modified modulation and two triangular carriers which it's applied to a five level hybrid multilevel inverter (based on the Half-Bridge(More)
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