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D2.2. LITES luminaires produced
Larat, Emmanuel; Delrot, Pascal; Avotins, Ansis; Alves, Luis NeroThe Deliverable D2.2. “LITES luminaires produced” deals with Task 2.3. “Toolkits fabrication for luminaires’ production” and Task 2.4. “Production of the final LITES luminaires”. The objective of this Deliverable is to allow preparing the embedding of all LITES subsystems (power supply, sensors, antenna, etc...), Integrate of all the subcomponents into the luminaires and check (test) the mechanical, electrical ...
Folded-cascode transimpedance amplifiers employing a CMOS inverter as input stage
Lima, Elton N.; Cura, José Luís; Alves, Luis NeroThis paper presents the design and comparison of two shunt feedback transimpedance amplifiers (TIAs) implemented in standard 350nm CMOS technology from Austria Microsystems. These transimpedance amplifiers are based on a folded cascode topology. The first one is a conventional folded-cascode (CFC-TIA) and the second is a modified version folded-cascod (MFC-TIA) employing a CMOS inverter at the input stage. The ...
Deliverable D4.1: VLC modulation schemes
Kumar, Navin; Figueiredo, Mónica; Alves, Luis Nero; Aguiar, Rui LuísThis report presents the analysis of different modulation schemes D4.1 for VLC systems of the VIDAS project. Considering the final prototype design and application, the deliverable D4.1 was projected. The detail analysis of various modulation schemes are carried out and a robust technique based on direct sequence spread spectrum (DSSS) is followed. DSSS technique though necessitates use of high bandwidth while ...
Transceiver for an Unmanned Airborne Vehicle
Serafim, André; Pinto, Pedro; Mendes, Luís; Alves, Luís NeroThis paper describes a transmission/reception (transceiver) system for the 456MHz - 459MHz band, which allows data communication between a ground station and an unmanned airborne vehicle. The transceiver makes use of quadrature frequency translation techniques, coherent indirect methods for signal generation and supports input signals with several types of modulation. The intermodulation products harmonics and ...
Design techniques for high performance optical wireless front-ends
Alves, Luís Nero; Aguiar, Rui L.Wireless optical networks usually have demanding specifications in terms of bandwidth, dynamic range and sensitivity. The front-end is a critical element for the fulfillment of these demands. This paper discusses several design aspects of front-ends for optical wireless communications, covering techniques for achieving high gains, high input dynamic ranges, improving noise performance, and reducing electromagne...
A CMOS signal to noise measurement circuit for infrared sectored receivers
Alves, Luís Nero; Aguiar, Rui L.; Santos, Dinis M.This paper describes a circuit able to measure Signal to Noise ratios developed for Infrared applications. The Signal to Noise ratio is of major importance in IR Sectored Receivers because it provides the basis of selection or combining of signals coming from different optical sectors. This circuit estimates the ratio of the average optical signal sensed in the photo-detector and the average noise power present...
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