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1 to 50 of 174 results
  • Telecomunicacions

     Berenguer Sau, Jordi
    Date of publication: 2013-01
    Book chapter

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  • Ground Plane Booster Antenna Technology for Wireless Handheld Devices

     Andújar Linares, Aurora
    Defense's date: 2013-10-04
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

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  • Telecomunicacions

     Berenguer Sau, Jordi
    Date of publication: 2012-01-31
    Book chapter

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    Tot i l'habitual creixement en potència i nuclis dels microprocessadors, l'any va tenir com a gran novetat l'estabilització del nou mercat dels telèfons intel·ligents (smartphones) i, sobre tot, de les "tauletes" (tablets), on diversos fabricants van començar a fer competència als iPhone i iPad d'Apple que ja van comercialitzar noves versions durant l'any 2011. També cal destacar que va crèixer de la idea de la "inf ormàtica verda" (green computing) respectuosa amb el medi ambient i, sobre tot, la força de les xarxes socials quasi ja del tot imprescindibles. Sense oblidar la desaparició, en poques setmanes, de tres personatges que han estat fonamentals en diversos aspectes de la informàtica moderna, ni els esforços d'Europa per estar al dia en el tema dels projectes de futur de les TIC. També és novetat l’arribada d’Amazon a Espanya, a partir de setembre d’enguany. Això suposa, entre d’altres coses, una empenta a la venda del seu lector de eBooks Kindle que es proposa com a regal nadalenc.

    Postprint (author’s final draft)

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    Advanced design features of Doherty power amplifiers  Open access

     Bertran Alberti, Eduardo; Gilabert Pinal, Pere Lluis; Berenguer Sau, Jordi
    Simposium Nacional de la Unión Científica Internacional de Radio
    Presentation's date: 2012-09-13
    Presentation of work at congresses

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    A Doherty power amplifier (DPA) is an effective structure born in 1936 which, after a scarce revival around year 2000), had been strengthened from 2005 because its capability to combine linear amplification with power efficiency. Despite the conceptual simplicity of its basic operation, a lot of practical drawbacks shrink the theoretical behavior, thus leading a significant number of research works to overcome them. The main objective in DPA research is to increase efficiency while maintaining linearity and filling the specified bandwidth. This paper presents a survey of the state of the art of DPA advanced design aspects. After a short review of the DPA operation principles, aspects regarding improvements for linearity, power efficiency and amplification bandwidth are introduced. Besides, some alternative structures and technologies, as well as practical design aspects and some trade-offs which the designer usually has to face are also presented.

  • Envelope tracking amplification with reduced slew-rate and bandwidth envelopes

     Vizarreta Paz, Pedro Pablo; Montoro López, Gabriel; Gilabert Pinal, Pere Lluis; Bertran Alberti, Eduardo; Berenguer Sau, Jordi; Gelonch Bosch, Antoni; García, José Angel
    Simposium Nacional de la Unión Científica Internacional de Radio
    Presentation's date: 2012-09-13
    Presentation of work at congresses

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    This paper presents an Envelope Tracking Pow- er Amplifier whose architecture includes a Hybrid Envelope Amplifier (HEA) and an algorithm to adapt the envelope’s characteristics to the HEA’s limitations. The HEA attempts to combine the high efficiency of a switched amplifier with the wide band capabilities of a linear amplifier. A modified Slew Rate (SR) reduction algorithm cope with the bandwidth and SR limitations of the HEA. On the other hand, the non-linearities introduced by this Envelope Amplifier (EA) and by the dynamic supply are compensated using Digital Pre-Distortion. Results show that these non-linearities are compensable and that the architecture offers higher efficiency figures compared to the conventional linear EA

  • Medalla de plata de la UPC

     Berenguer Sau, Jordi
    Award or recognition

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  • Soluciones de procesado digital de la señal para sistemas inalambricos sostenibles y reconfigurables

     Montoro López, Gabriel; Bertran Alberti, Eduardo; Berenguer Sau, Jordi; Gelonch Bosch, Antoni; Marojevic, Vuk; Vizarreta Paz, Pedro Pablo; Gómez, Ismael; Gomez Miguelez, Ismael; Gilabert Pinal, Pere Lluis
    Participation in a competitive project

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  • Digital predistortion of envelope tracking amplifiers driven by slew-rate limited envelopes

     Montoro López, Gabriel; Gilabert Pinal, Pere Lluis; Berenguer Sau, Jordi; Bertran Alberti, Eduardo
    IEEE International Microwave Symposium
    Presentation's date: 2011-06-09
    Presentation of work at congresses

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  • Digital processing compensation mechanisms for highly efficient transmitter architectures

     Gilabert Pinal, Pere Lluis; Montoro López, Gabriel; Vizarreta Paz, Pedro Pablo; Berenguer Sau, Jordi
    IET microwaves antennas and propagation
    Date of publication: 2011-06-06
    Journal article

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    El transmisor sostenible  Open access

     Gilabert Pinal, Pere Lluis; Montoro López, Gabriel; Bertran Alberti, Eduardo; Berenguer Sau, Jordi
    Telecos.cat. Enginyers de Telecomunicació
    Date of publication: 2011-03-01
    Journal article

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  • Telecomunicacions

     Berenguer Sau, Jordi
    Date of publication: 2011-01
    Book chapter

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  • La nova televisió

     Berenguer Sau, Jordi
    Date of publication: 2011-01
    Book chapter

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    Implementación de un transmisor LINC en un procesador FPGA  Open access

     Vizarreta Paz, Pedro Pablo; Gilabert Pinal, Pere Lluis; Montoro López, Gabriel; Berenguer Sau, Jordi
    Simposium Nacional de la Unión Científica Internacional de Radio
    Presentation's date: 2010-09-15
    Presentation of work at congresses

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  • Telecomunicacions

     Berenguer Sau, Jordi
    Date of publication: 2010-02-01
    Book chapter

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    A method for real-time generation of slew-rate limited envelopes in envelope tracking transmitters  Open access

     Montoro López, Gabriel; Gilabert Pinal, Pere Lluis; Bertran Alberti, Eduardo; Berenguer Sau, Jordi
    IEEE International Microwave Workshop Series on RF Front-Ends for Software Defined and Cognitive Radio Solutions
    Presentation's date: 2010-02-22
    Presentation of work at congresses

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  • Connecteu-aerospace.cat

     Collado Gomez, Juan Carlos; Prats Menéndez, Xavier; Berenguer Sau, Jordi; de Villardi de Montlaur, Adeline; Mateu Mateu, Jordi
    Participation in a competitive project

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    FPGA implementation of an LMS-based real-time adaptive predistorter for power amplifiers  Open access

     Gilabert Pinal, Pere Lluis; Bertran Alberti, Eduardo; Montoro López, Gabriel; Berenguer Sau, Jordi
    North -East Workshop on Circuits and Systems/TAISA
    Presentation's date: 2009-06-28
    Presentation of work at congresses

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    Current status of the 12 MeV UPC race-track microtron  Open access

     Koubychine Merkulov, Youri Alexandrovich; Berenguer Sau, Jordi; Crisol, A; Gonzalez, Xavier; Montoro López, Gabriel; Rigla Perez, Juan Pablo; Roure Fernandez, Francisco; Carrillo, David; Garcia-Tabares, Luis; Toral, F; Lucas, J; Aloev, A.V.; Shvedunov, V.I.
    Particle Accelerator Conference
    Presentation of work at congresses

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    A com­pact race-track mi­crotron (RTM) with the max­i­mal out­put en­er­gy 12 MeV is under con­struc­tion at the Uni­ver­si­tat Politècnica de Catalun­ya (UPC) in col­lab­o­ra­tion with the Sko­belt­syn In­sti­tute of Nu­cle­ar Physics of the Moscow State Uni­ver­si­ty, CIEMAT and a few Span­ish in­dus­tri­al com­pa­nies and med­i­cal cen­ters. The RTM end mag­nets are four-pole sys­tems with the mag­net­ic field cre­at­ed by a rare-earth per­ma­nent mag­net ma­te­ri­al. As a source of elec­trons a 3D off-ax­is elec­tron gun is used. These el­e­ments to­geth­er with a C-band ac­cel­er­at­ing struc­ture, dipole mag­nets, which allow to ex­tract the elec­tron beam with en­er­gy from 6 MeV to 12 MeV in 2 MeV step, and a fo­cus­ing quadrupole are placed in­side a vac­u­um cham­ber. We re­port on the cur­rent sta­tus of the tech­ni­cal de­sign and re­sults of tests of some of the com­po­nents.

  • Telecomunicacions

     Berenguer Sau, Jordi
    Date of publication: 2009-09-30
    Book chapter

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  • TECNICAS DIGITALES AVANZADAS PARA TECNOLOGIAS EMERGENTES EN TRASMISORES INALAMBRICOS

     Berenguer Sau, Jordi; Gilabert Pinal, Pere Lluis; Delgado Penin, Jose A.; Bertran Alberti, Eduardo; Hernandez Marco, Jordi; Montoro López, Gabriel
    Participation in a competitive project

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  • Setmana'09 de les Telecomunicacions

     Palà Schönwälder, Pere; Berenguer Sau, Jordi; Esquerra Llucià, Ignasi; Gabriel, JosepMa; Giralt Mas, M. Rosa; Marques Calvo, Jose Joaquin; Gutierrez Cabello, Jorge Luis; del Águila López, Francisco
    Collaboration in exhibitions

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    On passive bias networks for drain-modulated power amplifiers  Open access

     Bertran Alberti, Eduardo; García García, José Angel; Montoro López, Gabriel; Gilabert Pinal, Pere Lluis; Berenguer Sau, Jordi
    International Symposium on Microwave and Optical Technology
    Presentation's date: 2009-12-16
    Presentation of work at congresses

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    BAETULO XXI, o de com arribar a Mart des de la secundària  Open access

     Ayza, Assumpta; Berenguer Sau, Jordi; Carnerero Lopez, Sheila; Crespo Artiaga, Daniel; Lopez Codina, Daniel; López Rubio, Juan; Loren Aguilar, Pablo; Melo Vera, Maria Jesús; Monfort Peligero, Lluís; Pijuan, Caterina; Portell Canal, Xavier; Ramírez Alcantara, Jorge; Serrano Porta, Lydia
    Congrés d'Enginyeria i Cultura Catalana
    Presentation's date: 2008-12-05
    Presentation of work at congresses

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  • Multi Look-Up Table Digital Predistortion for RF Power Amplifier Linearization  Open access  awarded activity

     Gilabert Pinal, Pere Lluis
    Defense's date: 2008-02-12
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

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    Aquesta Tesi Doctoral se centra en el disseny d'un nou linealitzador de Predistorsió Digital (Digital Predistortion - DPD) capaç de compensar la dinàmica i els efectes no lineals introduïts pels Amplificadors de Potència (Power Amplifiers - PAs). Un dels trets més rellevants d'aquest nou predistorsionador digital i adaptatiu consisteix en ser deduïble a partir d'un model de PA anomenat Nonlinear Auto-Regressive Moving Average (NARMA). A més, la seva arquitectura multi-LUT (multi-Taula) permet la implementació en un dispositiu Field Programmable Gate Array (FPGA).La funció de predistorsió es realitza en banda base, per tant, és independent de la banda freqüencial on es durà a terme l'amplificació del senyal de RF, el que pot resultar útil si tenim en compte escenaris multibanda o reconfigurables. D'altra banda, el fet que aquest DPD tingui en compte els efectes de memòria introduïts pel PA, representa una clara millora de les prestacions aconseguides per un simple DPD sense memòria. En comparació amb d'altres DPDs basats en models més computacionalment complexos, com és el cas de les xarxes neuronals amb memòria (Time-Delayed Neural Networks - TDNN), la estructura recursiva del DPD proposat permet reduir el nombre de LUTs necessàries per compensar els efectes de memòria del PA. A més, la seva estructura multi-LUT permet l'escalabilitat, és a dir, activar or desactivar les LUTs que formen el DPD en funció de la dinàmica que presenti el PA.En una primera aproximació al disseny del DPD, és necessari identificar el model NARMA del PA. Un dels majors avantatges que presenta el model NARMA és la seva capacitat per trobar un compromís entre la fidelitat en l'estimació del PA i la complexitat computacional introduïda. Per reforçar aquest compromís, l' ús d'algoritmes heurístics de cerca, com són el Simulated Annealing o els Genetic Algorithms, s'utilitzen per trobar els retards que millor caracteritzen la memòria del PA i per tant, permeten la reducció del nombre de coeficients necessaris per caracteritzar-la. Tot i així, la naturalesa recursiva del model NARMA comporta que, de cara a garantir l'estabilitat final del DPD, cal dur a terme un estudi previ sobre l'estabilitat del model.Una vegada s'ha obtingut el model NARMA del PA i s'ha verificat l'estabilitat d'aquest, es procedeix a l'obtenció de la funció de predistorsió a través del mètode d'identificació predictiu. Aquest mètode es basa en la continua identificació del model NARMA del PA i posteriorment, a partir del model obtingut, es força al PA perquè es comporti de manera lineal. Per poder implementar la funció de predistorsió en la FPGA, cal primer expressar-la en forma de combinacions en paral·lel i cascada de les anomenades Cel·les Bàsiques de Predistorsió (BPCs), que són les unitats fonamentals que composen el DPD. Una BPC està formada per un multiplicador complex, un port RAM dual que actua com a LUT (taula de registres) i un calculador d'adreces. Les LUTs s'omplen tenint en compte una distribució uniforme dels continguts i l'indexat d'aquestes es duu a terme mitjançant el mòdul de l'envoltant del senyal. Finalment, l'adaptació del DPD consisteix en monitoritzar els senyals d'entrada i sortida del PA i anar duent a terme actualitzacions periòdiques del contingut de les LUTs que formen les BPCs. El procés d'adaptació del contingut de les LUTs es pot dur a terme en la mateixa FPGA encarregada de fer la funció de predistorsió, o de manera alternativa, pot ser duta a terme per un dispositiu extern (com per exemple un DSP - Digital Signal Processor) en una escala de temps més relaxada. Per validar l'exposició teòrica i provar el bon funcionalment del DPD proposat en aquesta Tesi, es proporcionen resultats tant de simulació com experimentals que reflecteixen els objectius assolits en la linealització del PA. A més, certes qüestions derivades de la implementació pràctica, tals com el consum de potència o la eficiència del PA, són també tractades amb detall.

    This Ph.D. thesis addresses the design of a new Digital Predistortion (DPD) linearizer capable to compensate the unwanted nonlinear and dynamic behavior of power amplifiers (PAs). The distinctive characteristic of this new adaptive DPD is its deduction from a Nonlinear Auto Regressive Moving Average (NARMA) PA behavioral model and its particular multi look-up table (LUT) architecture that allows its implementation in a Field Programmable Gate Array (FPGA) device.The DPD linearizer presented in this thesis operates at baseband, thus becoming independent on the final RF frequency band and making it suitable for multiband or reconfigurable scenarios. Moreover, the proposed DPD takes into account PA memory effects compensation which representsan step forward in overcoming classical limitations of memoryless predistorters. Compared to more computational complex DPDs with dynamic compensation, such Time-Delayed Neural Networks (TDNN), this new DPD takes advantage of the recursive nature of the NARMA structure to relax the number of LUTs required to compensate memory effects in PAs. Furthermore, its parallel multi-LUT architecture is scalable, that is, permits enabling or disabling the contribution of specific LUTs depending on the dynamics presented by a particular PA.In a first approach, it is necessary to identify a NARMA PA behavioral model. The extraction of PA behavioral models for DPD linearization purposes is carried out by means of input and output complex envelope signal observations. One of the major advantages of the NARMA structure regards its capacity to deal with the existing trade-off between computational complexity and accuracy in PA behavioral modeling. To reinforce this compromise, heuristic search algorithms such the Simulated Annealing or Genetic Algorithms are utilized to find the best sparse delays that permit accurately reproducing the PA nonlinear dynamic behavior. However, due to the recursive nature of the NARMA model, an stability test becomes a previous requisite before advancing towards DPD linearization.Once the PA model is identified and its stability verified, the DPD function is extracted applying a predictive predistortion method. This identification method relies just on the PA NARMA model and consists in adaptively forcing the PA to behave as a linear device. Focusing in the DPD implementation, it is possible to map the predistortion function in a FPGA, but to fulfill this objective it is first necessary to express the predistortion function as a combined set of LUTs.In order to store the DPD function into a FPGA, it has to be stated in terms of parallel and cascade Basic Predistortion Cells (BPCs), which are the fundamental building blocks of the NARMA based DPD. A BPC is formed by a complex multiplier, a dual port RAM memory block acting as LUT and an address calculator. The LUT contents are filled following an uniform spacing procedure and its indexing is performed with the amplitude (modulus) of the signal's envelope.Finally, the DPD adaptation consists in monitoring the input-output data and performing frequent updates of the LUT contents that conform the BPCs. This adaptation process can be carried out in the same FPGA in charge of performing the DPD function, or alternatively can be performed by an external device (i.e. a DSP device) in a different time-scale than real-time operation.To support all the theoretical design and to prove the linearization performance achieved by this new DPD, simulation and experimental results are provided. Moreover, some issues derived from practical experimentation, such as power consumption and efficiency, are also reported and discussed within this thesis.

  • Telecomunicacions

     Berenguer Sau, Jordi; Molins Borrell, Climent
    Date of publication: 2008-01
    Book chapter

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  • TIC i mobilitat

     Berenguer Sau, Jordi
    Date of publication: 2008-01
    Book chapter

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  • Overview of power amplifier linearization based on predistortion techniques

     Bertran Alberti, Eduardo; Gilabert Pinal, Pere Lluis; Berenguer Sau, Jordi
    8th WSEAS International Conference on power systems
    Presentation of work at congresses

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  • La formació de professionals en el sector aeronàutic: la visió universitària

     Berenguer Sau, Jordi
    El Sector Aeronàutic a Catalunya
    Presentation's date: 2008-09-19
    Presentation of work at congresses

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  • EL MAPA DE GRADOS EN LA EPSC Y LAS COMPETENCIAS PROFESIONALES EN LA INGENIERÍA DE TELECOMUNICACIÓN

     Berenguer Sau, Jordi
    Jornadas Docentes del Departamento de Arquitectura de Computadores
    Presentation's date: 2008-02-14
    Presentation of work at congresses

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  • Competencias profesionales de los ingenieros de telecomunicación

     Berenguer Sau, Jordi
    Conferencia sobre el espacio europeo de educación superior
    Presentation's date: 2008-01-30
    Presentation of work at congresses

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  • LAS ATRIBUCIONES PROFESIONALES DE LA INGENIERÍA DE TELECOMUNICACIÓN ANTE EL NUEVO ESQUEMA DE GRADOS Y MÁSTER EEES.

     Berenguer Sau, Jordi
    IX Jornadas del Área de Teoría de la Señal y Comunicaciones
    Presentation's date: 2008-07-10
    Presentation of work at congresses

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  • Overview of Power Amplifier Linearization Based on Predistortion Techniques

     Bertran Alberti, Eduardo; Gilabert Pinal, Pere Lluis; Montoro López, Gabriel; Berenguer Sau, Jordi
    8th WSEAS CONFERENCE (Simulation, Modelling and Identification)
    Presentation of work at congresses

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  • Improvements of Up-converters linearity for KA-band operation

     Bertran Alberti, Eduardo; Berenguer Sau, Jordi; Montoro López, Gabriel; Gilabert Pinal, Pere Lluis; Cidronali, Alessandro
    ASIA PACIFIC MICROWAVE CONFERENCE
    Presentation of work at congresses

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  • Telecomunicacions

     Berenguer Sau, Jordi
    Date of publication: 2007-01
    Book chapter

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  • PROJECTE DE DIFUSIÓ DEL CONEIXEMENT A LA COMARCA DEL BAIX LLOBREGAT

     Berenguer Sau, Jordi
    Participation in a competitive project

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  • Hierarchical study of millimeter wave wideband wireless system: study on mm-wave telcommunication applications

     Bertran Alberti, Eduardo; Delgado Penin, Jose A.; Montoro López, Gabriel; Gilabert Pinal, Pere Lluis; Berenguer Sau, Jordi
    Date: 2007-07
    Report

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  • Millimeter wave wideband wireless systems: power amplifier linearization

     Montoro López, Gabriel; Gilabert Pinal, Pere Lluis; Bertran Alberti, Eduardo; Berenguer Sau, Jordi; Delgado Penin, Jose A.
    Date: 2007-10
    Report

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  • El parque mediterráneo de la tecnología: Un foco generador de sinergias entre universidad y empresa.

     Berenguer Sau, Jordi
    V SEMINARIO INTERNACIONAL DEL GRUPO CONSOLIDADO MEDAMÉRICA
    Presentation's date: 2007-05-02
    Presentation of work at congresses

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  • Ressenya: Diccionari de telecomunicacions

     Berenguer Sau, Jordi
    Llengua i ús
    Date of publication: 2007-10
    Journal article

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    A class of stable nonlinear systems for modelling memory effects in RF power amplifiers  Open access

     Montoro López, Gabriel; Gilabert Pinal, Pere Lluis; Berenguer Sau, Jordi; Bertran Alberti, Eduardo
    Simposium Nacional de la Unión Científica Internacional de Radio
    Presentation of work at congresses

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  • An 8-Output Broadband Power Divider for GSM-DCS Applications

     Berenguer Sau, Jordi
    13th IEEE Mediterranean Electrotechnical Conference
    Presentation's date: 2006-05-17
    Presentation of work at congresses

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  • Telecomunicacions

     Berenguer Sau, Jordi
    Date of publication: 2006-01
    Book chapter

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  • Suplement 28

     Berenguer Sau, Jordi
    Date of publication: 2006-01-31
    Book chapter

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  • Linear power amplifier design & wireless systems

     Alonso Zárate, Luis Gonzaga; Bertran Alberti, Eduardo; Montoro López, Gabriel; Gilabert Pinal, Pere Lluis; Berenguer Sau, Jordi
    Date of publication: 2006
    Book

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  • Aplicació de algoritmos nolineales recursivos a la linealización de etapas de RF con efectos de memoria.

     Gilabert Pinal, Pere Lluis; Bertran Alberti, Eduardo; Berenguer Sau, Jordi; Montoro López, Gabriel
    Date: 2006-04
    Report

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  • Report on power amplifier linearisation for HAPs

     Bertran Alberti, Eduardo; Montoro López, Gabriel; Gilabert Pinal, Pere Lluis; Berenguer Sau, Jordi; Delgado Penin, Jose A.; Cesari, A; Baladron, A; Zozaya, A J
    Date: 2006-07
    Report

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  • Diseño y montaje de un banco de trabajo para la evaluación de algoritmos de predistorsión digital

     Gilabert Pinal, Pere Lluis; Bertran Alberti, Eduardo; Berenguer Sau, Jordi; Montoro López, Gabriel; Delgado Penin, Jose A.
    Date: 2006-06
    Report

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  • Improvement of the Linear Dynamic Range of Ka-Band Up-Converters

     Bertran Alberti, Eduardo; Berenguer Sau, Jordi; Montoro López, Gabriel; Cidronali2, A
    Date: 2006-10
    Report

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  • An 8-Output Broadband Power Divider for GSM-DCS Applications

     Berenguer Sau, Jordi; Montoro López, Gabriel; Bertran Alberti, Eduardo
    13th IEEE Mediterranean Electrotechnical Conference
    Presentation of work at congresses

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  • Enlargement of the up-converters linear range for HAP applications (Ka-Band)

     Bertran Alberti, Eduardo; Montoro López, Gabriel; Berenguer Sau, Jordi; Cidronalli, A
    York HAP Week 2006
    Presentation of work at congresses

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