47 research outputs found

    Quality diagrams with PyCirkuit

    Get PDF
    I'd like to present PyCirkuit, a little python application acting as a front-end to circuit-macros and dpic language, allowing the creation of high quality graphics and circuit diagrams to be included into LaTeX and other documents. This application is inspired by "Cirkuit", a KDE4 applicattion written by Matteo AgostinelliPreprin

    Treball: aplicacions de la sèrie de Fourier

    Get PDF
    2020/20211r quadrimestr

    Resum d’ordres i procediments Octave a Circuits i Sistemes Lineals

    Get PDF
    2022/202

    A direct-sequence spread-spectrum super-regenerative receiver

    Get PDF
    Current applications of the super-regenerative receiver use narrowband modulations. In this paper a new architecture that allows incoherent detection of spread-spectrum signals is presented. A pseudorandom code generator has been added to the original circuit. It is clocked by the quench oscillator and takes advantage of the characteristic broad reception bandwidth. CDMA can be achieved via ASK and FSK modulated signals with high simplicity in the RF stage as well as low power consumption.Peer ReviewedPostprint (published version

    Treball: el transistor bipolar

    Get PDF
    2021/20222n quadrimestr

    Context-aware lossless and lossy compression of radio frequency signals

    Get PDF
    We propose an algorithm based on linear prediction that can perform both the lossless and near-lossless compression of RF signals. The proposed algorithm is coupled with two signal detection methods to determine the presence of relevant signals and apply varying levels of loss as needed. The first method uses spectrum sensing techniques, while the second one takes advantage of the error computed in each iteration of the Levinson–Durbin algorithm. These algorithms have been integrated as a new pre-processing stage into FAPEC, a data compressor first designed for space missions. We test the lossless algorithm using two different datasets. The first one was obtained from OPS-SAT, an ESA CubeSat, while the second one was obtained using a SDRplay RSPdx in Barcelona, Spain. The results show that our approach achieves compression ratios that are 23% better than gzip (on average) and very similar to those of FLAC, but at higher speeds. We also assess the performance of our signal detectors using the second dataset. We show that high ratios can be achieved thanks to the lossy compression of the segments without any relevant signal.This work was (partially) funded by the European Space Agency (ESA) Contract No. 4000137290, the Spanish Ministry of Science and Innovation projects PID2019-105717RB-C22 (RODIN) and PID2021-122842OB-C21, the ERDF (a way of making Europe) by the European Union, the Institute of Cosmos Sciences University of Barcelona (ICCUB, Unidad de Excelencia María de Maeztu) through grant CEX2019-000918-M, grant 2021 SGR 1033 by Generalitat de Catalunya (AGAUR), and fellowship FPI-UPC 2022 by Universitat Politècnica de Catalunya and Banc de Santander.Postprint (published version

    Treball: filtres analògics

    Get PDF
    2019/20202n quadrimestr

    Resposta a senyals periòdics : aplicació de les Sèries de Fourier

    Get PDF
    2020/202
    corecore