Encontrados 6 documentos, a visualizar página 1 de 1
Channels and parameters acquisition in cooperative OFDM systems
Neves, D.; Ribeiro, C.; Silva, A.; Gameiro, A.CODIV, FP7/ICT/2007/215477 ; CADWIN, PTDC/EEA – TEL/099241/2008 ; Portuguese Foundation for Science and Technology (FCT)
Notes for differential demodulation of CPFSK signals
A. GameiroThis paper deals with differential demodulation ofCPFSK signals with modulation index 1/2 (MSK) and 1.Making use of the signal complex envelopes, we show thatthe existence of discrete lines with adequate phase in themodulated signal, can be used in a differential demodulationoperation as a local reference. This has advantages whendemodulating signals with intersymbol interference (ISI). Ingeneral because of its...
Design and Characterization of a 20 Gbit/s Clock Recovery Circuit
P. Monteiro; J. N. Matos; A. Gameiro; P. A. Matos; J. F. da RochaIn this communication we report the design of a clock recovery circuit produced for the 20 Gbit/s demonstrator of the RACE 2011 project "TRAVEL" of the European Community. The clock recovery circuit is based on an open loop structure using a dielectric resonator narrow bandpass filter with high Q.A detailed electrical characterization of the circuit and alsoits sensitivity to temperatur...
Granulomas do Pénis - Uma Complicação Rara da Terapia Intravesical com Bacilo C...
Lestre, S; João, A; Gameiro, C; Paiva Lopes, MJA imunoterapia com o Bacilo Calmette-Guérin é amplamente usada no tratamento e profilaxia da neoplasia urotelial superficial. As complicações associadas ao tratamento são comuns. Os autores relatam um caso de inflamação granulomatosa do pênis, associada à terapia intravesical com Bacilo Calmette-Guérin, com múltiplos nódulos eritematosos indolores localizados na glande. É também efetuada uma revisão da literatu...
Combined distributed turbo coding and space frequency block coding techniques
Bota, V.; Polgar, Zs. A.; Silva, A.; Teodoro, S.; Stef, M. P.; Moço, A.; Botos, A.; Gameiro, A.The distributed space-time (frequency) coding and distributed channel turbo coding used independently represent two cooperative techniques that can provide increased throughput and spectral efficiency at an imposed maximum Bit Error Rate (BER) and delay required from the new generation of cellular networks. This paper proposes two cooperative algorithms that employ jointly the two types of techniques, analyzes ...
Simulation-based evaluation of spectrum opportunities in UMTS cellular networks
Pereira, A.; Gameiro, A. S.A scenario based on an UMTS TDD opportunistic cellular system that operates over UMTS FDD licensed cellular networks is considered. Therefore we develop a simulation tool that addresses the goal of analysis and assessment of UMTS TDD opportunistic radio system in a coexistence environment with UMTS FDD primary cellular networks. The communication presents the scenario considered, the main features of the tool, ...
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