Search Results - "Grajal, J"

Pipelined Radix- 2^ Feedforward FFT Architectures by Garrido, M., Grajal, J., Sanchez, M. A., Gustafsson, O.

“…The appearance of radix-2 2 was a milestone in the design of pipelined FFT hardware architectures. Later, radix-2 2 was extended to radix-2 k . However,…”
Get full text

A Pipelined FFT Architecture for Real-Valued Signals by Garrido, M., Parhi, K.K., Grajal, J.

“…This paper presents a new pipelined hardware architecture for the computation of the real-valued fast Fourier transform (RFFT). The proposed architecture takes…”
Get full text

Physics-Based Design and Optimization of Schottky Diode Frequency Multipliers for Terahertz Applications by Siles, J V, Grajal, J

“…Planar Schottky diode frequency multipliers are by far the most employed devices for local oscillator (LO) power generation at terahertz frequencies. In order…”
Get full text

Digital channelized receiver based on time-frequency analysis for signal interception by Lopez-Risueno, G., Grajal, J., Sanz-Osorio, A.

“…A digital channelized receiver is presented for the interception of a wide variety of signals of complex structure, including those with low probability of…”
Get full text

Implementing FFT-based digital channelized receivers on FPGA platforms by Sanchez, M.A., Garrido, M., Lopez-Vallejo, M., Grajal, J.

“…This paper presents an in-depth study of the implementation and characterization of fast Fourier transform (FFT) pipelined architectures suitable for broadband…”
Get full text

Multiple signal detection and estimation using atomic decomposition and EM by Lopez-Risueno, G., Grajal, J.

“…An algorithm to detect and estimate a linear mixture of deterministic signals corrupted by white Gaussian noise is presented. The number of signals is assumed…”
Get full text

Remote collection and measurement of photogenerated carriers swept by surface acoustic waves in GaN by Palacios, T., Calle, F., Grajal, J.

“…The interaction of surface acoustic waves and photogenerated carriers in GaN has been used for the fabrication of a remote ultraviolet detector where the…”
Get full text

Atomic decomposition for radar applications by Yeste-Ojeda, O.A., Grajal, J., Lopez-Risueno, G.

“…In this paper, we explore the promising capabilities of atomic decomposition (AD) for radar-related applications from a practical point of view. Some…”
Get full text

Modeling and design aspects of millimeter-wave and submillimeter-wave Schottky diode varactor frequency multipliers by Grajal, J., Krozer, V., Gonzalez, E., Maldonado, F., Gismero, J.

“…Design and optimization of Schottky varactor diode frequency multipliers for millimeter and submillimeter wavelengths are generally performed using harmonic…”
Get full text

Design of Submillimeter Schottky Mixers Under Flat-Band Conditions Using an Improved Drift-Diffusion Model by Siles, J.V., Grajal, J., Di Carlo, A.

“…Minimum conversion loss in millimeter and submillimeter-wave Schottky mixers is achieved when the diodes are slightly pushed into the flat-band regime. The…”
Get full text

Nanotechnology for SAW devices on AlN epilayers by Palacios, T., Calle, F., Monroy, E., Grajal, J., Eickhoff, M., Ambacher, O., Prieto, C.

“…Hexagonal aluminum nitride (AlN) has revealed as an excellent candidate to be used as substrate for surface acoustic wave (SAW) devices. Its high SAW…”
Get full text

Analysis and characterization of a monobit receiver for electronic warfare by Grajal, J., Blazquez, R., Lopez-Risueno, G., Sanz, J.M., Burgos, M., Asensio, A.

“…Detection of simultaneous signals and real-time operation are basic characteristics in broadband electronic warfare (EW) receivers. A digital channelized…”
Get full text

Substrate-illuminated THz Antenna-coupled Detectors in CMOS: Analytical and Experimental Comparison of Various Designs by Ferreras, M., Cibiraite-Lukenskiene, D., Lisauskas, A., Grajal, J., Krozer, V.

“…We report on the design procedure and characterization of a set of antenna-coupled terahertz detectors based on a single-transistor layout and fabricated on…”
Get full text

Genomic Location of the Fw Gene for Resistance to Fusarium Wilt Race 1 in Peas by Grajal-Martìn, M. J., Muehlbauer, F. J.

“…Resistance to fusarium wilt in peas (Pisumsativum L.) caused by Fusarium oxysporum Schlect. f. sp. pisi race 1 (van Hall) Snyd. & Hans. is conferred by a…”
Get full text

Two-Layer Particle Filter for Multiple Target Detection and Tracking by Garcia-Fernandez, A. F., Grajal, J., Morelande, M. R.

“…The detection and tracking of an unknown number of targets using a Bayesian hierarchical model with target labels is presented. To approximate the posterior…”
Get full text

Digital channelised receivers on FPGAs platforms by Sanchez, M.A., Garrido, M., Lopez-Vallejo, M., Grajal, J., Lopez-Barrio, C.

“…This paper presents several implementations of digital channelised receivers on field-programmable gate array (FPGA) platforms for electronic warfare (EW)…”
Get full text

CFAR detectors for unknown signals based on the spectral correlation measurement by Ojeda, O.A.Y., Grajal, J.

“…This paper deals with the unknown signal detection problem by using spectral correlation-based detectors. Spectral correlation-based techniques exploit the…”
Get full text

From a high-resolution LFM-CW shipborne radar to an airport surface detection equipment by Grajal, J., Asensio, A., Requejo, L.

“…This paper presents a modification of a linear frequency modulation-continuous waveform shipborne surveillance radar (Perez et al. (2002)) with two antennas to…”
Get full text

AlGaN/GaN HEMTS: material, processing, and characterization by CALLE, F, PALACIOS, T, MONROY, E, GRAJAL, J, VERDU, M, BOUGRIOUA, Z, MOERMAN, I

“…The growth of AlGaN/GaN high electron mobility transistor (HEMT) structures on sapphire by metal organic vapor phase epitaxy (MOVPE) is described, with special…”
Get full text

Multiparametric importance sampling for simulation of radar systems by Grajal, J., Asensio, A.

“…The performances of the importance sampling (IS) techniques are improved by using multiparametric distortions of the input random processes. The analysis of…”
Get full text