Dr. Jon Legarda Macón

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[u' @article{echevarria_lwake:_2016, title = {{lwAKE}: {A} {Lightweight} {Authenticated} {Key} {Exchange} for {Class} 0 {Devices}}, volume = {2016}, url = {http://www.hindawi.com/journals/ijdsn/2016/6236494/}, doi = {10.1155/2016/6236494}, abstract = {Device-to-Device (D2D) communication enables devices in proximity to establish a wireless direct link. However, these devices may be severely constrained in terms of memory, CPU, and processing resources. Hence, a D2D communication with a constrained device implies new challenges as it does not have the resources required to be secured with standard cryptography. We propose lwAKE for class 0 devices (RFC 7228), which uses one-way cryptographic functions and zero-knowledge proofs to provide mutual authentication and a secure key establishment. We specify the protocol using the High Level Protocol Specification Language and then verify the security properties using the model checkers OFMC and CL-AtSe. The significance of the protocol stands in a key reuse for any successive authentication. Experimental results show that this shortened authentication mode reduces the computationalloadgreatly.}, language = {en}, journal = {International Journal of Distributed Sensor Networks}, author = {Echevarr\xeda, Juan Jos\xe9 and Legarda, Jon and Larra\xf1aga, Janire and Ruiz-de-Garibay, Jonathan}, month = may, year = {2016}, note = {00000}, keywords = {D2D communications, authentication, constrained devices, jcr0.665, key exchange, lightweight cryptography, q4} }']

[u' @inproceedings{larranaga_experimentally_2015, title = {An experimentally validated {PRIME} subnetwork simulation model for utility applications}, doi = {10.1109/ISPLC.2015.7147596}, abstract = {This paper presents a PRIME subnetwork simulation model based on OMNeT++ that reproduces the behaviour of real networks. The developed simulation model uses the most common logical topology of a selected real network provided by a previous monitoring process. Thanks to the developed simulation model, different algorithms and utility applications can be tested in the simulation environment without having to perform lengthy field tests. The model has been validated with the firmware upgrade application comparing the total time involved in such operation both in the simulation and in the real environment. Results show that, according to the two-sample t-test, the mean time to perform the firmware upgrade of the network nodes is equal in both environments.}, booktitle = {2015 {International} {Symposium} on {Power} {Line} {Communications} and its {Applications} ({ISPLC})}, author = {Larra\xf1aga, Janire and Legarda, Jon and Urrutia, I. and Sendin, A.}, month = mar, year = {2015}, note = {00000}, keywords = {Network topology, Noise, OMNeT++, PLC, PRIME, PRIME subnetwork simulation model, Power line communications, Standards, Switches, Topology, XML, carrier transmission on power lines, experimental validation, firmware upgrade application, real PRIME subnetworks, simulation model, utility applications}, pages = {95--100} }']

[u' @inproceedings{eguiluz_maximizing_2015, address = {Freiburg}, title = {Maximizing {Harvested} {Energy} for {Linear} {Vibration}-based generators}, volume = {120}, doi = {10.1016/j.proeng.2015.08.693}, abstract = {This work presents a new method that increases the energy conversion for linear vibration-based generators. Actually, these generators are chosen to have their resonance frequency equal to the ambient vibration frequency that provides the maximum power amplitude of the acceleration. Nevertheless, there is a resonance frequency at which the acceleration power amplitude is lower but the energy is substantially higher since ambient vibration signals have several frequency components. A new method performing a spectrogram analysis, which does not miss the temporal information, as the Discrete Fourier Transform (DFT) analysis does, is realized. Thus, the harvested energy is considered instead of the harvested power. The method presented in this paper is validated with several real experiments.}, language = {English}, publisher = {Elsevier}, author = {Eguiluz, Xabier and Legarda, Jon and Mateu, Loreto and Zessin, Henrik and Spies, Peter}, year = {2015}, note = {00000}, keywords = {Energy harvesting, FFT, Piezoelectric generators, Piezoelectricity, Power, Spectrogram, energy}, pages = {641--644} }']

[u' @article{ruiz-de-garibay_rfid_2014, title = {{RFID} {Presenter}: {A} {New} {Way} to {Feel} a {Talk}}, volume = {2014}, issn = {1687-5869}, shorttitle = {{RFID} {Presenter}}, url = {http://www.hindawi.com/journals/ijap/2014/197437/abs/}, doi = {10.1155/2014/197437}, abstract = {RFID is a key which enables technology for the Internet of Things paradigm, allowing the virtualization of the physical objects into the Internet. There are uncountable applications whereby these connected objects can be a breakthrough for new business models, and this work shows a good example of that. We present the RFID Presenter as the evolution of a classical consumer electronic product to a novel connected Internet product with the addition of the RFID technology. It supposes a new way to manage the conference talks in a personalization way, improving the end-user interaction and providing services that were impossible before. The design, implementation, and validation of a real gadget are well explained in order to give a real example of how the Internet of Things can be integrated into daily objects and enhance the end-user experiences.}, language = {en}, urldate = {2014-04-11}, journal = {International Journal of Antennas and Propagation}, author = {Ruiz-de-Garibay, Jonathan and Legarda, Jon and Kados, Szilard and Eguiluz, Xabier}, month = apr, year = {2014}, note = {00000}, keywords = {IoT, Q3, jcr0.683, presenter, rfid, rfidpresenter}, } ']

[u" @article{alonso-arce_ultra_2014, title = {Ultra low-power smart medical sensor node based on a central venous catheter for in-body biomonitoring}, volume = {35}, issn = {1959-0318}, url = {http://www.sciencedirect.com/science/article/pii/S1959031814000785}, doi = {http://dx.doi.org/10.1016/j.irbm.2014.06.001}, abstract = {Abstract New advances in biosensor and electronic technologies will merge in new health assistance paradigms strongly based on the remote biomonitoring. Biomedical circuit and systems have much to say on this, as for example the Central Venous Catheters (CVC). Central venous catheters are commonly used in clinical practice to improve a patient's quality of life. Nevertheless, there remains a large risk of infection associated with microbial biofilm (about 80\\% of all human bacterial infections). The standardization bodies, the radiofrequency devices and the biosensor technology are taking their positions, and the integration of all that effort is the work proposed in this paper. An ultra-low power active medical implant is presented for in-body monitoring of Electrical BioImpedance (EBI) based sensors with a new 3-D antenna. Transmission test and detailed evaluation have been done based on two typical monitoring parameters: the frequency of the internal sensor measuring and the frequency of external communication requests. The results show up to 20 months lifetime powered with a 50 mA coin-cell battery.}, number = {6}, journal = {\\{IRBM\\}}, author = {Alonso-Arce, M. and Bustamante, P. and Schmidt, C. and Legarda, J. and Sedano, B.}, year = {2014}, note = {00000 Healthcom 2013}, keywords = {IF0.380}, pages = {362 -- 369} }"]

[u' @article{paredes_smart_2014, title = {Smart central venous port for early detection of bacterial biofilm related infections}, volume = {16}, issn = {1387-2176}, url = {http://dx.doi.org/10.1007/s10544-014-9839-3}, doi = {10.1007/s10544-014-9839-3}, language = {English}, number = {3}, journal = {Biomedical Microdevices}, author = {Paredes, J. and Alonso-Arce, M. and Schmidt, C. and Valderas, D. and Sedano, B. and Legarda, J. and Arizti, F. and G\xf3mez, E. and Aguinaga, A. and Del Pozo, J.L. and Arana, S.}, year = {2014}, note = {00006}, keywords = {Bacterial biofilms, Catheter sepsis, IF2.700, In vivo diagnostics, Intelligent implant, Intravascular port}, pages = {365--374} }']

[u' @inproceedings{alonso-arce_ultra_2013, address = {Lisbon, Portugal}, title = {Ultra {Low}-{Power} {Smart} {Medical} {Sensor} {Node} for {In}-{Body} {Biomonitoring}}, isbn = {978-1-4673-5800-2}, author = {Alonso-Arce, M. and Legarda, J. and Sedano, B. and Bustamante, P.}, month = dec, year = {2013}, pages = {465--470} }']

[u' @article{echevarria_webtag:_2012, title = {{WebTag}: {Web} {Browsing} into {Sensor} {Tags} over {NFC}}, volume = {12}, copyright = {http://creativecommons.org/licenses/by/3.0/}, shorttitle = {{WebTag}}, url = {http://www.mdpi.com/1424-8220/12/7/8675}, doi = {10.3390/s120708675}, abstract = {Information and Communication Technologies (ICTs) continue to overcome many of the challenges related to wireless sensor monitoring, such as for example the design of smarter embedded processors, the improvement of the network architectures, the development of efficient communication protocols or the maximization of the life cycle autonomy. This work tries to improve the communication link of the data transmission in wireless sensor monitoring. The upstream communication link is usually based on standard IP technologies, but the downstream side is always masked with the proprietary protocols used for the wireless link (like ZigBee, Bluetooth, RFID, etc.). This work presents a novel solution (WebTag) for a direct IP based access to a sensor tag over the Near Field Communication (NFC) technology for secure applications. WebTag allows a direct web access to the sensor tag by means of a standard web browser, it reads the sensor data, configures the sampling rate and implements IP based security policies. It is, definitely, a new step towards the evolution of the Internet of Things paradigm.}, language = {en}, number = {7}, urldate = {2013-12-03TZ}, journal = {Sensors}, author = {Echevarria, Juan Jose and Ruiz-de-Garibay, Jonathan and Legarda, J. and Alvarez, Maite and Ayerbe, Ana and Vazquez, Juan Ignacio}, month = jun, year = {2012}, keywords = {Internet of Things, Q1, TCP/IP tunneling, Wireless sensor networks, embedded web server, jcr1.953, near field communication, sensor tag, webtag, wireless sensor monitoring}, pages = {8675--8690} }']

[u' @article{solar_design_2011, title = {Design model for fully integrated high-performance linear {CMOS} power amplifiers}, volume = {5}, issn = {1751-8725}, doi = {10.1049/iet-map.2010.0217}, abstract = {A model for fully integrated CMOS linear power amplifiers (PAs) is presented. The model predicts the performance of the CMOS PA in terms of power-added efficiency (PAE) and output power (P-OUT) with respect to the main design parameters, such as supply voltage, current consumption, gain and inductor quality factors (Qs). In order to demonstrate the usefulness of the model, several studies showing the impact of these design parameters on the PA performance are presented. Finally, a 0.18 mu m fully integrated CMOS PA has been fabricated and compared with the model, showing good agreement. The fabricated PA presents 23 dBm of 1 dB compression point (P-1dB) and 27 dBm of saturated power (P-SAT) at 4.2 GHz with high maximum PAE of 32\\%.}, language = {English}, number = {7}, journal = {Iet Microwaves Antennas \\& Propagation}, author = {Solar, H. and Bistue, G. and Legarda, J. and Fernandez, E. and Berenguer, R.}, month = may, year = {2011}, note = {WOS:000291307100008}, keywords = {IF0.836, digital predistortion, network, standard, transceiver}, pages = {795--803} }']

[u" @article{idirin_implementation_2011, title = {Implementation {Details} and {Safety} {Analysis} of a {Microcontroller}-based {SIL}-4 {Software} {Voter}}, volume = {58}, issn = {0278-0046}, doi = {10.1109/TIE.2010.2062471}, abstract = {This paper presents a microcontroller-based software voting process that complies with Safety Integrity Level-4 (SIL-4) requirements. The selected system architecture consists of a 2 out of 2 schema, in which one channel acts as Master and the other as Slave. Each redundant channel uses a microcontroller as central element. The present analysis demonstrates that this system fulfills SIL-4 requirements. Once the system architecture is detailed, the system overall functionality and the data flow are presented. Then, the microcontroller's internal architecture is explained, and the software voting process flow-diagram is discussed. Afterward, the resources of the microcontroller architecture that are used for the execution of each task involved in the software voting process (hardware-software interaction) are determined. Finally, a fault analysis is elaborated to demonstrate that the cases in which the safety requirements are compromised have a very small occurrence probability, i.e., the hazard rate of proposed voting is below 1E-9.}, language = {English}, number = {3}, journal = {Ieee Transactions on Industrial Electronics}, author = {Idirin, Mikel and Aizpurua, Xabier and Villaro, Almir and Legarda, J. and Melendez, Juan}, month = mar, year = {2011}, note = {WOS:000287323800012}, keywords = {Data corruption, IF1.740, safety analysis, sil-4, software voting}, pages = {822--829} }"]

[u' @book{arrizabalaga_multiservice_2010, title = {Multiservice {QoS} architecture for a multi-dwelling gateway, design, implementation and validation}, isbn = {978-3-639-23214-1}, publisher = {VDM}, author = {Arrizabalaga, Saioa and Salterain, Antonio and Legarda, J.}, year = {2010} }']

[u' @book{cabezas_usable_2010, title = {A usable semantic {OSGI} architecture within the smart home environment}, isbn = {978-3-639-27416-5}, publisher = {VDM}, author = {Cabezas, Pablo and Sarriegi, J. M. and Legarda, J.}, year = {2010} }']

[u' @article{mayordomo_high-resolution_2009, title = {High-{Resolution} {ACLR} {Measurement} {Architecture} for {Adaptive} {Feedforward} {Amplifiers}}, volume = {58}, issn = {0018-9456}, doi = {10.1109/TIM.2008.2003314}, abstract = {One of the most restrictive linearity constraints to RF transmitter nonlinearity is the unwanted emission immediately outside the channel bandwidth, mostly known as adjacent channel leakage ratio (ACLR). In this paper, novel architecture design rules are presented for ACLR-level measurement in feedforward adaptive amplifiers. Both main and distortion signal power levels are obtained without any masquerading effect and with minimum component utilization. A prototype implementation is introduced to validate the proposed design rules, and a commercial spectrum analyzer is used for accuracy checking. Finally, the thermal stability has been tested for the -20 degrees C to 70 degrees C range.}, language = {English}, number = {2}, journal = {Ieee Transactions on Instrumentation and Measurement}, author = {Mayordomo, Iker and Legarda, J. and Presa, Jorge and Valderas, Daniel}, month = feb, year = {2009}, note = {WOS:000262428800027}, keywords = {Adjacent channel leakage ratio (ACLR), IF1.200, feed-forward amplifier, masquerading effect, nonlinear distortion, receiver}, pages = {429--433} }']

[u' @incollection{cabezas_power_2009, title = {The power of reflection: {Combining} semantics in service oriented architectures for dynamic intelligent invocation}, isbn = {978-1-60741-661-6}, booktitle = {Java {Software} and {Embedded} {Systems}}, publisher = {Nova Science Publishers, Inc}, author = {Cabezas, Pablo and Arrizabalaga, Saioa and Salterain, Antonio and Legarda, J.}, year = {2009} }']

[u' @article{arrizabalaga_novel_2009, title = {A {Novel} {QoS} {Architecture} for {Multi}-{Service} {Provisioning} in {Multi}-{Residential} {Gateways}}, volume = {55}, issn = {0098-3063}, abstract = {The Residential Gateway (RG) is known as the connection box that provides multi-service access to the consumer networks. This work is focused on a Multifers more Residential Gateway; (MRG) concept, which of service provisioning and management capabilities. The QoS support in this context is challenging, as new requirements must be fulfilled regarding such multi-network and multiservice environment. Both design and development processes are shown in depth and the proposed solution is tested and compared with the main trends among the state of the art. This paper provides an optimum multi-service QoS provisioning architecture for multi-residential units as the best trade off between packet loss and delay performances. The implemented test bed (with VoIP, Interactive Video, Telnet, Web, FTP and Bulk traffic provisioning through up to 20 simultaneous consuming units) validates this design and provides some interesting future works(1).}, language = {English}, number = {2}, journal = {Ieee Transactions on Consumer Electronics}, author = {Arrizabalaga, Saioa and Cabezas, Pablo and Legarda, J. and Salterain, Antonio}, month = may, year = {2009}, note = {WOS:000267941600026}, keywords = {IF1.080, Quality of Service, Queue Management, Residential Gateway, Scheduling, management}, pages = {477--485} }']

[u' @incollection{cabezas_enhancing_2009, address = {Berlin}, title = {Enhancing {OSGi}: {Semantic} {Add}-ins for {Service} {Oriented} {Collaborative} {Environments}}, volume = {5597}, isbn = {978-3-642-02867-0}, shorttitle = {Enhancing {OSGi}}, abstract = {Service Oriented Architectures offer an incomparable setting for the management and reuse of services, mixing different factors like software and services. The ability to choose between the services available often gets blurry, because of the difficulty when trying to find the best service that fits better the actual needs, or even because its invocation process gets excessively complex. This work presents a horizontal layer that enhances service capabilities in OSGi by adding semantic information for intelligent and advanced management in SOA-compliant smart architectures, and more specifically in a Multi-Residential Environment.}, language = {English}, booktitle = {Ambient {Assistive} {Health} and {Wellness} {Management} in the {Heart} of the {City}, {Proceeding}}, publisher = {Springer-Verlag Berlin}, author = {Cabezas, Pablo and Barrena, Raul and Legarda, J. and Lopez-de-Ipina, Diego}, editor = {Mokhtari, M. and Khalil, I. and Bauchet, J. and Zhang, D. and Nugent, C.}, year = {2009}, note = {WOS:000270130800037}, keywords = {Multi-Residential Environments, OSGi, Semantic Services, Service Oriented Architectures, residential gateways}, pages = {261--264} }']

[u' @article{solar_fully_2009, title = {A fully integrated 23.2 {dBm} {P}-1 ({dB}) {CMOS} power amplifier for the {IEEE} 802.11 a with 29\\% {PAE}}, volume = {42}, issn = {0167-9260}, doi = {10.1016/j.vlsi.2008.09.005}, abstract = {A two-stage fully integrated power amplifier (PA) for the 802.11a standard is presented. The PA has been fabricated using UMC 0.18 mu m CMOS technology. Measurement results show a power gain of 21.1 dB, a P-1 (dB) of 23.2 dBm and a P-SAT of 26.8 dBm. The PAE is 29\\% and it is kept high by means of several integrated inductors. These inductors present low-DC resistance and high Q characteristics. The inductors must include extra design considerations in order to withstand the high-current levels flowing through them, so that they have been called power inductors. (C) 2008 Elsevier B.V. All rights reserved.}, language = {English}, number = {1}, journal = {Integration-the Vlsi Journal}, author = {Solar, Hector and Berenguer, Roc and de Nob, Joaquin and Gurutzeaga, Inaki and Alvarado, Unai and Legarda, J.}, month = jan, year = {2009}, note = {WOS:000261920100009}, keywords = {CMOs, IEEE 802.11a, IF0.400, Power amplifier, Power inductor, transceiver, wlan}, pages = {77--82} }']

[u' @article{arrizabalaga_multi-residential_2008, title = {Multi-{Residential} {Gateway}: an innovative concept and a practical approach}, volume = {54}, issn = {0098-3063}, shorttitle = {Multi-{Residential} {Gateway}}, doi = {10.1109/TCE.2008.4560113}, abstract = {A new concept of Multi-Residential Gateway (MRG) capable of managing several residential units (e.g. homes, flats) simultaneously while offering new additional services is presented. A part from the typical recommendations proposed for residential gateways, specific new requirements are introduced in order to overcome the multi-residential challenge. A novel MRG has been developed fulfilling all the previous constrains. Both the core and the management architectures are explained, with particular emphasis on the networking aspects and its modular firewall/QoS design. An OSGi based platform has been introduced as the best management framework, and its validation is done with the addition of a MRG Parental Control Service.}, language = {English}, number = {2}, journal = {Ieee Transactions on Consumer Electronics}, author = {Arrizabalaga, Saioa and Cabezas, Pablo and Legarda, J. and Salterain, Antonio}, month = may, year = {2008}, note = {WOS:000257285300039}, keywords = {IF1.080, QoS management, Residential Gateway, architecture, home, management, mrg, multi-residential, osgi, services, system}, pages = {444--452} }']

[u' @incollection{cabezas_agent_2008, address = {New York}, title = {An {Agent} {Based} {Semantic} {OSGi} {Service} {Architecture}}, volume = {131}, isbn = {978-3-540-79186-7}, abstract = {The OSGi Framework offers a cooperative environment for the deployment and management of services for multidisciplinary software applications, achieving interoperability between systems. But even so, its service registry lack of non-syntactic information prohibits agents making this framework available for a wider range of applications. This paper proposes an agent-based novel architecture with a semantic in-memory OSGi service registry based on OWL. It enhances the potential of OSGi with semantic data extracted from services deployed in the framework, using software agents in conjunction with Java Annotations and Java Reflection API to dynamically obtain and invoke all required information. As a result, service development and deployment in the OSGi framework will get another view, avoiding the commonly used Interfaces pattern. This Architecture has been Successfully applied to a domotic environment managed by a Service Residential Gateway (SRG).}, language = {English}, booktitle = {Computer and {Information} {Science}}, publisher = {Springer}, author = {Cabezas, Pablo and Arrizabalaga, Saioa and Salterain, Antonio and Legarda, J.}, editor = {Lee, R. and Kim, H. K.}, year = {2008}, note = {WOS:000261332300009}, keywords = {OSGi, Residential Gateway, domotic environment, semantic architecture, service agents}, pages = {97--106} }']

[u' @article{alvarado_low_2008, title = {Low {Frequency} {Noise} {Optimization} in {Gilbert}-{Cell}-{Based} {Mixers} for {Direct} {Conversion} (zero-{If}) {Receivers}}, volume = {50}, issn = {0895-2477}, doi = {10.1002/mop.23940}, abstract = {This letter analyses the low frequency noise performance in Gilbert-cell-based zero-IF mixers. Several issues for optimizing the flicker noise performance while keeping a good mixer performance in terms of gain, noise figure, and power consumption are introduced in a quantitative manner. A CMOS zero-IF mixer has been fabricated and measured. A flicker noise reduction up to 10.4 dB is achieved at 10 kHz with a power consumption of only 5.4 mW. (C) 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3128-3131, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23940}, language = {English}, number = {12}, journal = {Microwave and Optical Technology Letters}, author = {Alvarado, U. and Berenguer, R. and Adin, I. and Melendez, J. and Legarda, J. and Bistue, G.}, month = dec, year = {2008}, note = {WOS:000260744000034}, keywords = {CMOS mixer, IF0.580, flicker noise, low-noise, low-power, zero-IF receiver}, pages = {3128--3131} }']

[u' @article{valderas_uwb_2008, title = {{UWB} {Staircase}-{Profile} {Printed} {Monopole} {Design}}, volume = {7}, issn = {1536-1225}, doi = {10.1109/LAWP.2008.921364}, abstract = {In printed monopoles, the current distribution along the lower monopole sheet and upper groundplane edges can be made analogous to a transmission line distribution by an appropriate antenna feed design. Accordingly, the VSWR {\\textless} 2 impedance bandwidth upper frequency limit can be estimated for staircase-profile printed 2-D ultrawideband (UWB) monopoles. Following this guideline, three tailored-bandwidth prototypes are designed, implemented and measured. They retain their length and width while multiplying their upper frequency (4.87, 8.7, and 15.15 GHz) by the number of monopole profile steps (1, 2, and 3). The deviation is found mainly below 13\\% in relation to the reference formula. The concept of angular range based on pattern stability factor (PSF) is introduced to compare the solid angle of UWB pattern stability operation when increasing the bandwidth. The angular range degradation versus impedance bandwidth improvement shows all the possible performance levels of the antennas. Thus, the design of UWB printed monopoles is approached from both points of view, i.e., impedance bandwidth and pattern stability.}, language = {English}, journal = {Ieee Antennas and Wireless Propagation Letters}, author = {Valderas, Daniel and Alvarez, Raul and Melendez, Juan and Gurutzeaga, Inaki and Legarda, J. and Sancho, Juan I.}, year = {2008}, note = {WOS:000268620200005}, keywords = {Broadband antennas, IF1.370, antenna, band, impedance bandwidth, low-profile antennas, monopole antennas, operation, pattern stability, printed antennas, transmission line modeling, ultrawideband (UWB) antennas}, pages = {255--259} }']

[u' @article{valderas_design_2006, title = {Design of {UWB} folded-plate monopole antennas based on {TLM}}, volume = {54}, issn = {0018-926X}, doi = {10.1109/TAP.2006.875509}, abstract = {From the current distribution on planar monopoles, transmission line modeling is applied to study this kind of antennas. Some reported techniques for broadband monopoles are approached by using this model from a qualitatively point of view. Conclusions are derived that help to match the monopoles over an ultrawide bandwidth regardless of whether they are folded or not. Folded configurations are obtained in order to provide solutions to specific designs and improve radiation pattern maintaining the planar monopole broadband behavior. Three compact folded prototypes with greater than 1:38 bandwidth are implemented and tested. Pulse distortion is also discussed for this type of applications.}, language = {English}, number = {6}, journal = {Ieee Transactions on Antennas and Propagation}, author = {Valderas, D. and Legarda, J. and Gutierrez, I. and Sancho, J. I.}, month = jun, year = {2006}, note = {WOS:000238232400008}, keywords = {IF2.330, band, folded-plate monopoles, impedance bandwidth, planar monopole, planar monopoles, terminals, transmission line modeling, ultrawideband (UWB) antennas}, pages = {1676--1687} }']

[u' @inproceedings{bustamante_ubiquitous_2006, address = {ALCALA DE HENARES, MADRID}, title = {A ubiquitous and adaptable services delivery platform for any kind of residential environment}, volume = {208}, isbn = {1613-0073}, author = {Bustamante, P. and Solas, G. and Legarda, J. and del Portillo, J.}, month = jun, year = {2006} }']

[u' @book{legarda_feedforward_2006, title = {Feedforward amplifiers for wideband communications systems}, isbn = {978-0-387-35137-7}, publisher = {Springer}, author = {Legarda, J.}, year = {2006} }']

[u' @inproceedings{mendizabal_low_2006, address = {Barcelona, Spain}, title = {A low power low noise figure {RF} front-end for mobile {GPS}/{Galileo} positioning services}, author = {Mendizabal, J. and Alvarado, U. and Solar, H. and Legarda, J. and Sancho, J. I. and Berenguer, R.}, month = nov, year = {2006} }']

[u' @article{legarda_adaptive_2005, title = {An adaptive feedforward amplifier under "maximum output" control method for {UNITS} downlink transmitters}, volume = {53}, issn = {0018-9480}, doi = {10.1109/TMTT.2005.852780}, abstract = {An adaptive feedforward amplifier is implemented for a Universal Mobile Telecommunication System (UNITS) downlink channel (2110-2170 MHz). An exhaustive characterization of the space of solution has corroborated the feedforward theoretical behavior. As a result, an alternative adjustment method is proposed, called "maximum output," which entails maximizing a specific designed objective function. Besides this, an adaptive control system, based on distortion signal minimization architecture, has been fabricated in order to apply the designed method. The overall system performance achieves significant improvements such as 16.7 dB on the third-order intermodulation product, measured with a 5-MHz separated two-tone signal, 15 dB on the adjacent channel leakage ratio level and 2.7 dB on the output power level, both of them obtained with UNITS test model 1 (64 channels). The maximum output control method allows fulfilling any standard linearity specification while power efficiency is maximized so the desired tradeoff between linearity and efficiency is achieved.}, language = {English}, number = {8}, journal = {Ieee Transactions on Microwave Theory and Techniques}, author = {Legarda, J. and Presa, J. and Hernandez, E. and Solar, H. and Mendizabal, J. and Penaranda, J. A.}, month = aug, year = {2005}, note = {WOS:000231269400003}, keywords = {IF2.220, Universal Mobile Telecommunication System (UMTS), adaptable control system, feedforward amplifier, output improvement, power minimization, wide-band code division multiple access (WCDMA)}, pages = {2481--2486} }']

[u' @article{hernandez_integrated_2005, title = {An integrated up-converter circuit in 0.8 mu m {SiGe} technology for {TV} applications}, volume = {36}, issn = {0026-2692}, doi = {10.1016/j.mejo.2004.11.011}, abstract = {This paper describes an up-converter circuit for a TV tuner chain that can be implemented in both analog and digital TV systems. The circuit is integrated into a low cost standard two metal layer 0.8 mu m SiGe technology and is composed with class AB Gilbert cell based active mixer and differential voltage-controlled oscillator (VCO). The use of a high quality balanced inductor in the VCO allows achieving a measured oscillator phase noise of -104.2 dBc/Hz at 100 kHz from the carrier. The frequency conversion is from TV standard IF to RF. The results obtained in a frequency up-conversion from 36 to 1775 MHz are: a conversion gain of -2.25 dB, a noise figure of 14.4 dB and an OIP3 value of 9.1 dBm. The core power consumption is 33 mA from 5 V power supply. (c) 2005 Elsevier Ltd. All rights reserved.}, language = {English}, number = {8}, journal = {Microelectronics Journal}, author = {Hernandez, E. and Berenguer, R. and Legarda, J. and Mendizabal, J. and Cendoya, I.}, month = aug, year = {2005}, note = {WOS:000231493600014}, keywords = {IF0.910, active mixer, balanced inductor, varactor, vco}, pages = {763--769} }']

[u' @inproceedings{quemada_cmos_2004, address = {Barcelona, Spain}, title = {A {CMOS} frequency synthesizer with selfbiasing current source for a 5-{Ghz} wireless {LAN} receiver}, isbn = {0-7803-8523-3}, publisher = {IEEE}, author = {Quemada, C. and Mendizabal, J. and Presa, J. and Adin, I. and Legarda, J. and Bistue, G.}, month = sep, year = {2004}, pages = {1886--1890} }']

[u' @inproceedings{adin_high-gain_2004, address = {Bordeaux, Francia}, title = {High-gain {LNA} in 0.18 \u03bc{M} {CMOS} technology for a {WLAN} receiver}, author = {Adin, I. and Bistue, G. and Quemada, C. and Solar, H. and Presa, J. and Legarda, J.}, month = nov, year = {2004} }']

[u' @inproceedings{presa_feedforward_2004, address = {Bilbao, Spain}, title = {Feedforward power amplifiers adjustment based on signal phase behavior}, author = {Presa, J. and Legarda, J. and Berenguer, R.}, month = oct, year = {2004} }']

[u' @inproceedings{legarda_feedforward_2004, address = {Bilbao, Spain}, title = {Feedforward amplifier control method adapted to {UMTS} transmitters}, author = {Legarda, J. and Presa, J. and Adin, I.}, month = oct, year = {2004} }']

[u' @inproceedings{presa_adaptive_2004, address = {Barcelona, Spain}, title = {An adaptive feedforward power amplifier for {UMTS} transmitters}, isbn = {0-7803-8523-3}, abstract = {The new communication standards like UMTS increase the spectral efficiency but a high linearity is required. RF power amplifiers are basic components of all wireless transceivers used in the communication systems, and their efficiency directly influences on the complete communication system efficiency. It is proposed the implementation of a linearization technique like feedforward to achieve lower cost and higher efficiency amplifiers with the same linearity. First, it is shown an adjusting method for balancing the amplitude, phase and delay elements in both loops of the feedforward architecture during the prototyping. Secondly, a prototype for UMTS downlink has been developed. This implementation demonstrates that with dynamic adjustment architecture and the proposed method, the linearity level is increased outstandingly in the range of 20 to 70 C. For a two tone signal separated 5MHz the IMD3 raise is 37,5dB and for a UNITS signal (test 1-64 channels) the ACPR increase is 15dB.}, language = {English}, publisher = {Ieee}, author = {Presa, J. and Legarda, J. and Solar, H. and Melendez, J. and Munoz, A. and Garcia-Alonso, A.}, month = sep, year = {2004}, note = {WOS:000225483300531}, keywords = {3g, amplifier, feedforward, linearization, umts, wcdma}, pages = {2715--2719} }']

[u' @inproceedings{sainz_software_2003, address = {CALELLA DE LA COSTA (BARCELONA)}, title = {A software for varactors simulation based on finite difference approximation}, author = {Sainz, Nekane and Gutierrez, I. and Legarda, J. and Garcia, J. and de No, Joaquin}, month = feb, year = {2003} }']

[u' @inproceedings{presa_linealizacion_2003, address = {UNIVERSIDAD DE LA CORU\xd1A - FACULTAD DE INFORMATICA}, title = {Linealizaci\xf3n de amplificadores de potencia mediante t\xe9cnicas feedforward din\xe1micas para {UMTS}}, author = {Presa, J. and Legarda, J. and Mu\xf1oz, A. and Ibarguren, J.}, month = sep, year = {2003} }']