Graphic summary
  • Show / hide key
  • Information


Scientific and technological production
  •  

1 to 50 of 396 results
  • A doherty power amplifier based on a tapered line impedance inverter

     Mehran, Yahyavi; Bertran Alberti, Eduardo
    International Multi-Conference on Systems, Signals and Devices
    p. 1-4
    Presentation's date: 2014-02-12
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper presents a wideband GaN Doherty power amplifier (DPA) in the 2.6 GHz band with a 3 stages Wilkinson splitter where the impedance inverter is based on a tapered line instead of a quarter wave transformer. From the comparison with the same amplifier using a typical quarter-wave transformer as impedance inverter, and keeping both designs the same bandwidth (1.6 to 3.3 GHz, 65% of the fractional bandwidth), the Power Added Efficiency (PAE) is enhanced up to 50% (from 40.46% to 61.17% at 35 dBm input power) in the DPA with a tapered line. Besides, the transducer gain remains practically unaltered.

  • Access to the full text
    Special issue on power amplifier linearization  Open access

     Wood, John; Bertran Alberti, Eduardo
    International journal of microwave and wireless technologies
    Vol. 5, num. 2, p. 101-102
    DOI: 10.1017/S1759078713000238
    Date of publication: 2013-04
    Journal article

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Order reduction of wideband digital predistorters using principal component analysis

     Gilabert Pinal, Pere Lluis; Montoro López, Gabriel; López Bueno, David; Bartzoudis, Nikolaos; Bertran Alberti, Eduardo; Payaró Llisterri, Miquel; Hourtane, Alain
    IEEE International Microwave Symposium
    p. 1-4
    DOI: 10.1109/MWSYM.2013.6697687
    Presentation's date: 2013-06-06
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper presents how to apply order reduction in wide-band digital predistortion (DPD) linearizers using the principal component analysis (PCA) technique. This method is tested in a wireless backhauling transmitter where four 28 MHz adjacent subcarrier transmission of M-QAM signals are considered. The DPD has to counteract not only the PA nonlinear behavior, but also its dynamics. This may results critical when considering wideband signals since the number of coefficients required to model memory effects can grow dramatically. By applying the PCA technique, the number of essential parameters can be significantly reduced. In addition, a strategy to minimize the computational cost of finding the optimal coefficients is also presented. A test-bed for evaluating the DPD linearization performance of the RF subsystem when PCA is applied was deployed and experimental results are presented in this paper

  • 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
    Competitive project

     Share

  • Access to the full text
    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
    p. 1-4
    Presentation's date: 2012-09-13
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    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 García, José Ángel
    Simposium Nacional de la Unión Científica Internacional de Radio
    Presentation's date: 2012-09-13
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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

  • Presidencia de sessió

     Bertran Alberti, Eduardo
    Simposium Nacional de la Unión Científica Internacional de Radio
    Presentation's date: 2012-09-14
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    El transmisor sostenible  Open access

     Gilabert Pinal, Pere Lluis; Montoro López, Gabriel; Bertran Alberti, Eduardo; Berenguer Sau, Jordi
    Telecos.cat. Enginyers de Telecomunicació
    num. 53, p. 16-18
    Date of publication: 2011-03-01
    Journal article

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • FPGA implementation of a real-time NARMA-based digital adaptive predistorter

     Gilabert Pinal, Pere Lluis; Montoro López, Gabriel; Bertran Alberti, Eduardo
    IEEE transactions on circuits and systems II: express briefs
    Vol. 58, num. 7, p. 402-406
    DOI: 10.1109/TCSII.2011.2158256
    Date of publication: 2011-07
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Digital front-end and system overview in wireless communication

     Bertran Alberti, Eduardo; Pagani, Maurizio
    Date of publication: 2011-09-29
    Book chapter

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Postprint (author’s final draft)

  • System overview and front-end technologies in digital broadcasting

     Tarres Ruiz, Francisco; Bertran Alberti, Eduardo
    Date of publication: 2011-09-29
    Book chapter

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Postprint (author’s final draft)

  • Digital front-end for multimode standards and multimode compatibility

     Bertran Alberti, Eduardo
    Date of publication: 2011-09-29
    Book chapter

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Postprint (author’s final draft)

  • Slew-rate limited envelopes for driving envelope tracking amplifiers

     Montoro López, Gabriel; Gilabert Pinal, Pere Lluis; Vizarreta Paz, Pedro Pablo; Bertran Alberti, Eduardo
    IEEE Radio & Wireless Symposium
    p. 17-20
    DOI: 10.1109/PAWR.2011.5725386
    Presentation's date: 2011-01-17
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper presents a practical application of a method for generating slew-rate limited envelopes in order to drive the dynamic supply of envelope tracking (ET) power amplifiers (PAs). The proposed method results useful to generate slower versions of the transmitted signal’s envelope to cope with the slew-rate and bandwidth limitations of envelope amplifiers. Moreover, this paper shows experimental results comparing the performance of ET when exciting the drain of a PA (based in a GaN transistor) with both the envelope of the signal and the slew-rate limited version of the envelope.

  • 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
    p. 1-4
    Presentation's date: 2011-06-09
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    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
    p. 1-4
    Presentation's date: 2010-02-22
    Presentation of work at congresses

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    On PAPR for combined modulation and access techniques in configurable radio  Open access

     Bertran Alberti, Eduardo; Porta, Oriol; Montoro López, Gabriel; Delgado Penin, Jose A.
    IEEE International Microwave Workshop Series on RF Front-Ends for Software Defined and Cognitive Radio Solutions
    p. 37-40
    Presentation's date: 2010-02-23
    Presentation of work at congresses

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    Implementation issues in FPGA-controlled polar transmitters  Open access

     Gilabert Pinal, Pere Lluis; Cabria, Lorena; García García, José Ángel; Montoro López, Gabriel; Bertran Alberti, Eduardo
    European Microwave Week
    p. 711-714
    Presentation's date: 2010-09-30
    Presentation of work at congresses

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    Arquitecturas de transmisión inalámbrica de alta eficiencia  Open access

     García García, José Ángel; de Mingo, Jesús; Montoro López, Gabriel; Cabria, Lorena; Marante, Reinel; García, Paloma; Sánchez, César; Bertran Alberti, Eduardo; Gilabert Pinal, Pere Lluis
    Simposium Nacional de la Unión Científica Internacional de Radio
    p. 1-4
    Presentation's date: 2010-09-15
    Presentation of work at congresses

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    FPGA-based set-up for RF power amplifier dynamic Supply with real-time digital adaptive predistortion  Open access

     Gilabert Pinal, Pere Lluis; Montoro López, Gabriel; Bertran Alberti, Eduardo; García García, José Ángel
    IEEE Radio & Wireless Symposium
    p. 1-4
    Presentation's date: 2010-01-12
    Presentation of work at congresses

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    Behavioral modeling and linearization of a mm-wave power amplifier  Open access

     Melczarsky, I; Gilabert Pinal, Pere Lluis; Giacomo, Di V; Bertran Alberti, Eduardo; Filicori, F
    International journal of microwave and wireless technologies
    Vol. 1, num. -, p. 127-136
    DOI: 10.1017/S1759078709000075
    Date of publication: 2009-04
    Journal article

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    An efficient combination of digital predistortion and OFDM clipping for power amplifiers  Open access

     Gilabert Pinal, Pere Lluis; Gadringer, ME; Montoro López, Gabriel; Mayer, ML; Silveira, DD; Bertran Alberti, Eduardo; Magerl, G
    International journal of RF and microwave computer-aided engineering
    Vol. 19, num. 5, p. 583-591
    Date of publication: 2009-09
    Journal article

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    This paper derives a general analytical expression of the feasibility condition for the uplink of a CDMA mobile communications system in a general scenario where the users in the system belong to an arbitrary number of service classes and the coverage deployment includes the presence of repeaters. An explicit expression of the admission region is derived and the dependencies on the parameter values are shown. An example is presented in order to illustrate the application of the proposed methodology in a real case.

  • Access to the full text
    Improvements and analysis of nonlinear parallel behavioral models  Open access

     Silveira, DD; Gilabert Pinal, Pere Lluis; Lavrador, PM; Pedro, JC; Gadringer, M; Montoro López, Gabriel; Bertran Alberti, Eduardo; Magerl, G
    International journal of RF and microwave computer-aided engineering
    Vol. 19, num. 5, p. 615-626
    DOI: 10.1002/mmce
    Date of publication: 2009-09
    Journal article

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • TECNICAS DIGITALES AVANZADAS PARA TECNOLOGIAS EMERGENTES EN TRASMISORES INALAMBRICOS

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

     Share

  • Access to the full text
    Analysis of inter-modulation products and nonlinear distortion in RF OFDM transmitter systems  Open access

     O'Droma, M; Lei, Y; Bertran Alberti, Eduardo; Gilabert Pinal, Pere Lluis
    IEEE Vehicular Technology Conference
    Presentation's date: 2009-04-26
    Presentation of work at congresses

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    On passive bias networks for drain-modulated power amplifiers  Open access

     Bertran Alberti, Eduardo; García García, José Ángel; Montoro López, Gabriel; Gilabert Pinal, Pere Lluis; Berenguer Sau, Jordi
    International Symposium on Microwave and Optical Technology
    p. 34-36
    Presentation's date: 2009-12-16
    Presentation of work at congresses

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Nonlinear Auto Regressive Moving Average Models

     Gilabert Pinal, Pere Lluis; Montoro López, Gabriel; Bertran Alberti, Eduardo
    Date of publication: 2009-01-31
    Book chapter

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    Análisis comparativo de técnicas de reducción de PAPR en señales OFDM  Open access

     Lopez Caro, Alberto; Gilabert Pinal, Pere Lluis; Montoro López, Gabriel; Bertran Alberti, Eduardo; Jove Casals, Jose M.
    Simposium Nacional de la Unión Científica Internacional de Radio
    Presentation's date: 2009-09-17
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Postprint (author’s final draft)

  • Access to the full text
    Técnicas Emergentes de Mejora del Compromiso Eficiencia-Linealidad en Transmisores de Radiofrecuencia  Open access

     García García, José Ángel; de Mingo, Jesús; Montoro López, Gabriel; Cabria, Lorena; Marante, Reinel; García, Paloma; Sánchez, Cesar; Bertran Alberti, Eduardo; Gilabert Pinal, Pere Lluis
    Simposium Nacional de la Unión Científica Internacional de Radio
    Presentation's date: 2009-09-17
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Postprint (author’s final draft)

  • Access to the full text
    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
    p. 268-271
    Presentation's date: 2009-06-28
    Presentation of work at congresses

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    A full FPGA-based implementation of an adaptive digital predistorter  Open access

     Gilabert Pinal, Pere Lluis; Montoro López, Gabriel; Bertran Alberti, Eduardo
    IEEE Topical Symposium on Power Amplifiers for Wireless Communications
    p. 1-2
    Presentation's date: 2009-01-19
    Presentation of work at congresses

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Effets of low temperature plasma nad wool and wool/nyln blend dyed fabrics

     Canal Barnils, Cristina; Molina, Ricardo; Bertran Alberti, Eduardo; Navarro Santañes, Antonio
    Fibers and polymers
    Vol. 9, p. 293-300
    Date of publication: 2008-10
    Journal article

     Share Reference managers Reference managers Open in new window

  • Estudio comparativo entre los efectos del plasma y el acabado industrual de tejidos de punto de lana y sus mezclas con poliamida 6

     Canal Barnils, Cristina; Molina, Ricardo; Bertran Alberti, Eduardo; Navarro Santañes, Antonio
    Revista de química e industria téxtil
    Vol. 105, p. 76-82
    Date of publication: 2008-10
    Journal article

     Share Reference managers Reference managers Open in new window

  • Multi-lookup table FPGA implementation of an adaptive digital predistorter for linearizing RF power amplifiers with memory effects

     Gilabert Pinal, Pere Lluis; Cesari, A; Montoro López, Gabriel; Bertran Alberti, Eduardo; Dilhac, J M
    IEEE transactions on microwave theory and techniques
    Vol. 56, num. 2, p. 372-384
    DOI: 10.1109/TMTT.2007.913369
    Date of publication: 2008-02
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

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

     Gilabert Pinal, Pere Lluis
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    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.

  • CONFERENCIA INAUGURAL EN WMB: ENABLING TECHNOLOGIES FOR WIRELESS TRANSCEIVERS BEYOND 3G

     Bertran Alberti, Eduardo
    IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM
    Presentation's date: 2008-06-15
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • CONFERENCIA CONVIDADA EN LA SESSIÓ DE "HIGH FREQUENCY CIRCUITS AND SYSTEMS" (1 HORA)

     Bertran Alberti, Eduardo
    8th WSEAS CONFERENCE (Simulation, Modelling and Identification)
    Presentation's date: 2008-09-23
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • 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
    p. 309-314
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Presidencia workshop WMO (Chairman) : Power Amplifier Modelling and Linearization (full day)

     Bertran Alberti, Eduardo
    European Microwave Conference 2008
    Presentation's date: 2008-10-27
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • On modeling of nonlinear distortion in ofdm transmitter systems

     O'Droma, M; Lei, Y; Bertran Alberti, Eduardo; Gilabert Pinal, Pere Lluis
    Asia Pacific Microwave Conference 2008
    p. 1-4
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Opening address wmo-1 workshop

     Bertran Alberti, Eduardo; Gottfried, Magerl
    European Microwave Conference 2008
    p. 1-10
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • 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)
    p. 309-314
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Beyond 3g needs for power amplifer

     Bertran Alberti, Eduardo
    IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM
    p. 3-51
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • A fully analog adaptive-disturbance canceller

     Bertran Alberti, Eduardo
    IEEE transactions on instrumentation and measurement
    Vol. 56, num. 5, p. 1605-1609
    Date of publication: 2007-10
    Journal article

     Share Reference managers Reference managers Open in new window

  • A New Digital Predictive Predistorter for Behavioral Power Amplifier Linearization

     Montoro López, Gabriel; Gilabert Pinal, Pere Lluis; Bertran Alberti, Eduardo; Cesari, A; Silveira, Daniel D.
    IEEE microwave and wireless components letters
    Vol. 17, num. 6, p. 448-450
    Date of publication: 2007-06
    Journal article

     Share Reference managers Reference managers Open in new window

  • Heuristic Algorithms for Power Amplifier Behavioral Modeling

     Gilabert Pinal, Pere Lluis; Silveira, Daniel D.; Montoro López, Gabriel; Gadringer, M E; Bertran Alberti, Eduardo
    IEEE microwave and wireless components letters
    Vol. 17, num. 10, p. 715-717
    Date of publication: 2007-10
    Journal article

     Share Reference managers Reference managers Open in new window

  • Performance analysis of power amplifier back-off levels in UWB transmitters

     Bertran Alberti, Eduardo; O'Droma, M S; Gilabert Pinal, Pere Lluis; Montoro López, Gabriel
    IEEE transactions on consumer electronics
    Vol. 53, num. 4, p. 1309-1313
    Date of publication: 2007-11
    Journal article

     Share Reference managers Reference managers Open in new window

  • Nonlinear auto-regressive moving average (NARMA) PA behavioral model

     Gilabert Pinal, Pere Lluis; Montoro López, Gabriel; Bertran Alberti, Eduardo
    Date: 2007-07
    Report

     Share Reference managers Reference managers Open in new window

  • WiselPAs)- Description of the simulator environment for the development of linearisation algorithms

     Gilabert Pinal, Pere Lluis; Montoro López, Gabriel; Bertran Alberti, Eduardo; Gadringuer, E Bertran M; Silkveira, D; Mayer, M
    Date: 2007-05
    Report

     Share Reference managers Reference managers Open in new window

  • Assessment of Digital Predistorters for MMRR transmitters

     Bertran Alberti, Eduardo; Gilabert Pinal, Pere Lluis; Murillo, Juan; Montoro López, Gabriel
    Date: 2007-06
    Report

     Share Reference managers Reference managers Open in new window

  • DPD behaviour on OFDM Measurements

     Gilabert Pinal, Pere Lluis; Montoro López, Gabriel; Bertran Alberti, Eduardo; Mayer, M; Gadringuer, M
    Date: 2007-09
    Report

     Share Reference managers Reference managers Open in new window