Se presentará en el “IEEE International Symposium on Broadband Multimedia Systems and Broadcasting”, que se celebrará en Nuremberg, Alemania, en junio de 2011.

Abstract: This paper proposes a novel framework for current OFDM systems to reduce the inter-carrier interference (ICI) caused by time-varying channels. The new ICI suppressing scheme is based on the application of the sum-product (SP) algorithm to a factor graph (FG) representing the joint a posteriori probability (APP) of the transmitted symbols. Simulation results show that this new iterative soft-input soft-output (SISO) detection strategy achieves good performance when the ICI power is high, due to high mobility or the use of large FFT sizes. We discuss its application in mobile reception of the new terrestrial digital television standard DVB-T2 for a set of realistic mobile scenarios.

Se presentará en el “IEEE International Symposium on Broadband Multimedia Systems and Broadcasting”, que se celebrará en Nuremberg, Alemania, en junio de 2011.

Abstract: We propose a new pilot structure for inter-carrier interference (ICI) estimation and compensation in order to improve the performance in mobile environments in the forthcoming Digital Video Broadcasting-Next Generation Handheld (DVBNGH) standard. In fixed environments the classical Wiener channel estimation technique turns out to be a good choice whereas in mobile scenarios the channel can be approximated by a basis expansion model (BEM) to include the ICI introduced due to the channel variations within one OFDM symbol. Additionally some terrestrial digital television transmission modes suffer from error floor, so we propose a combination of ICI cancellation algorithms with BEM channel estimation to combat the ICI. The results show a negligible degradation between the ideal channel knowledge and BEM estimation with large Doppler frequencies as well as the good performance of ICI cancellation algorithms

Low-complexity detection of golden codes in LDPC-coded OFDM systems

Se presentará en el “ICASSP 2011 - International Conference on Acoustics, Speech and Signal Processing”, que se celebrará entre el 23 y 27 de mayo de 2011 en Praga, República Checa.

Abstract: Recent and next-generation wireless broadcasting standards, such as DVB-T2 or DVB-NGH, are considering distributed multi-antenna transmission in order to increase bandwidth efficiency and signal quality. Full-rate full-diversity (FRFD) space-time codes (STC), such as the Golden code, have been reported to be excellent candidates, being their main drawback their detection complexity, which is enhanced when soft output is required when combined with a bit-interleaved coded modulation (BICM) scheme based on low-density parity check (LDPC) codes. We present a novel low-complexity soft detection algorithm for the reception of Golden codes in LDPC-based orthogonal frequency-division multiplexing (OFDM) systems. Complexity and simulation-based performance results are provided which show that the proposed detector performs close to the optimal detector in a variety of DVB-T2 broadcasting scenarios.

Rotated constellation demapper for DVB-T2

Se publicó este artículo en la revista “IET Electronics Letters”, vol. 47 pp. 47, en enero de 2011.

Abstract: The constellation rotation and cyclic Q-delay technique has been adopted in the second generation terrestrial digital video broadcasting (DVB-T2) standard. It improves the performance under fading channels, but introduces serious complexity problems in the hardware implementation of the demapper. Presented is a simplified demapper scheme that reduces up to 31% the number of required operations with almost no performance degradation.

CNR requirements for DVB-T2 fixed reception based on field trial results

Se publicó este artículo en la revista “IET Electronics Letters”, vol. 47, nº 1, pp. 57-59, en enero de 2011.

Abstract: Presented are the C/N requirements for DVB-T2 fixed reception. Results have been obtained from field trials carried out to test DVB-T2 performance, considering an outdoor rooftop antenna scenario. Two commercial receivers have been used to obtain C/N threshold values for an image error-free condition. The tested configuration modes are the ones recommended for this scenario: 32K FFT and 64 and 256 QAM constellations. DVB-T has also been measured to obtain direct comparison between both systems.

Comparison of area-efficient FFT algorithms for DVB-T2 receivers

Publicado en “IET Electronics Letters”, vol. 46, pp1088-1089, Digital Object Identifier: 10.1049/el.2010.0676, en 2010.

Abstract: Comparison at implementation level of several pipeline-SDF radix 2^k FFT architectures is proposed in order to obtain efficient algorithms for DVB-T2 receivers. In the analysis, the area and performance of the algorithms are compared. A variable datapath optimisation has been added to the comparison.

Presentado en el Congreso “DCIS 2010 - XXV CONFERENCE ON DESIGN OF CIRCUITS AND INTEGRATED SYSTEMS”, celebrado en Lanzarote del 17 al 19 de Noviembre de 2010.

Abstract: The Doppler spread limits the achievable throughput in Digital Video Broadcasting Satellite to Handheld (DVB-SH) receivers, mainly in mobile environments for moderate and high speeds. The Doppler on the reception of Orthogonal Frequency Division Multiplexing (OFDM) signals causes the Intercarrier Interference (ICI), which degrades significantly the receiver performance. The cancellation of this interference term is required to improve the DVB-SH reception robustness in highly mobile environments.  This paper proposes a new ICI cancellation scheme with a reduced hardware complexity, which was previously analyzed in Digital Video Broadcasting for Handhelds (DVB-H) receiver terminals. This technique is compared with other existing method that presents an ideal behavior in the ICI compensation. Simulations results show that the proposed method presents similar performance with a very important reduction of the required hardware resources.

La Nueva TV Digital Satelital Móvil DVBSH Ya Esta Aqui

Presentado en las XX Jornadas Telecom I+D, celebradas en Valladolid del 27 al 29 de septiembre de 2010

Presentado en las “XX Jornadas TELECOM I+D 2010”, celebradas en Valladolid del 27 al 29 de septiembre de 2010.

Presentado en el “ISWCS2010 (The Seventh International Symposium on Wireless Communication Systems)”, celebrado en la Universidad de York (United Kingdom), del 19 al 22 de Septiembre de 2010.

Presentado en el “XXV Simposium Nacional de la Unión Científica de Radio (URSI 2010)”, celebrado en Bilbao del 15 al 17 de Septiembre de 2010.

Abstract: In this paper, the rotated constellations are analyzed in the context of the upcoming Second Generation Digital Video Broadcasting (DVB-T2) standard. Compared to the use of non-rotated constellations, this technique provides a significant increase of the system performance in severe propagation scenarios. The main target of this paper is to analyze the effect of the rotation angle on the system robustness. Simulations have been run showing that the angles defined in the DVB-T2 specification are close to the optimum but other angles can be selected that offer better performance.

Presentado en el “XXV Simposium Nacional de la Unión Científica de Radio (URSI 2010)”, celebrado en Bilbao del 15 al 17 de Septiembre de 2010.

Abstract: In this paper, we present a simplified statistical model for DVB-SH (Digital Video Broadcasting - Satellite services to Handhelds) links in urban areas. It is valid for situations of moderate shadowing, and it allows to predict the fading depth relative to the line-of-sight value. The model should be useful for obtaining a first approximation of the performance of a DVB-SH link in urban areas. The results are validated with experimental data obtained from an Eutelsat satellite within the FURIA project.

Presentado en el “XXV Simposium Nacional de la Unión Científica de Radio (URSI 2010)”, celebrado en Bilbao del 15 al 17 de Septiembre de 2010.

Presentadoen el “XXV Simposium Nacional de la Unión Científica de Radio (URSI 2010)”, celebrado en Bilbao del 15 al 17 de Septiembre de 2010.

La entidad Universidad de Mondragón (MGEP) ha presentado este artículo en el “XXV Simposium Nacional de la Unión Científica de Radio (URSI 2010)”, celebrado en Bilbao del 15 al 17 de Septiembre de 2010.

Presentado en el “XXV Simposium Nacional de la Unión Científica de Radio (URSI 2010)”, celebrado en Bilbao del 15 al 17 de Septiembre de 2010.

Presentado en el congreso IEEE Vehicular Technology Conference (VTC) Fall 2010, celebrado en Ottawa, del 6 al 9 de septiembre 2010.

Presentado en la revista IEEE Transactions on Vehicular Technology 2010, vol. 59, no. 7, en septiembre de 2010

Publicado en la revista IEEE Transactions on Broadcasting 2010, vol. 56, no. 3, septiembre 2010.

Presentado en el “18th European Signal Processing Conference (EUSIPCO-2010)”, celebrado en Aalborg (Denmark), del 23 al 27 de Agosto de 2010.

Abstract: The goal of the future terrestrial and mobile digital video broadcasting standards is to combine diversity and spatial multiplexing in order to fully exploit the multiple-input multiple-output (MIMO) channel capacity. Full-rate full-diversity (FR-FD) space-time codes
(STC) such as the Golden code, that maximize the rate preserving the diversity gain, are studied for that purpose. Most of them present a high-complexity detection problem which results in a handicap for their hardware implementation. Therefore, we analyze the performance of a sub-optimal full-rate full-diversity 2x2 STC, whose design reduces the complexity of the detection, as an alternative for future MIMO broadcasting TV systems. The assessment of the proposed STC code is carried out over the bit-interleaved coded modulation
(BICM) scheme of DVB-T2 system which includes lowdensity parity check (LDPC) codes for error correction. Finally, soft STC list detection is studied in order to generate soft information for LDPC decoding

A 2×2 Novel MIMO Testbed for DVB-T2 Systems

Publicado en la revista de la “IEEE Transaction on Broadcasting” (volumen 56, nº 2, pp.184 -192) en junio de 2010.

Abstract: The increasing interest in MIMO (Multiple-Input Multiple-Output) systems has given rise to a prolific research activity in recent years. Both theoretical and practical issues have been studied. However, so far few MIMO testbeds or prototypes have been built for DVB-T or future standards. In this paper, a novel 2 × 2 MIMO testbed specifically designed for evaluating the performances of a DVB-T2 MIMO system is presented. The description of signal processing is detailed including a new scheme to estimate the MIMO channel matrix. Finally, measurement results with different polarization schemes are presented for typical scenarios, obtaining higher capacity in LoS situations using polarization diversity.

Coarse time synchronisation for DVB-T2

Publicado en la IEE Electronic Letters, vol. 46, nº 11, pp. 797-799, junio 2010

Metaheuristic Proposal to Minimize Self-Interference in Single Frequency Networks

Presentado en el COST Action 2100 Pervasive Mobile & Ambient Wireless Communications. 11th Management Committee Meeting, celebrado en Aalborg, (Dinamarca) del 2 al 4 de junio de 2010.

Improving Measurement Techniques for Testing Digital Broadcasting Systems

Publicado en el IEEE International Instrumentation and Measurement Technology Conference celebrado en Austin, Texas, del 3 al 6 de Mayo de 2010.

Radio Propagation Models for DVB-H Networks

Presentado en el congreso “IEEE European Conference on Antennas and Propagation (EUCAP) 2010”, celebrado en Barcelona, del 12 al 14 abril de 2010.

Propagation Model Calibration for DVB-SH in Terrestrial Single Frequency Networks

Presentado en el congreso “IEEE European Conference on Antennas and Propagation (EUCAP) 2010”, celebrado en Barcelona, del 12 al 14 de abril de 2010.

Presentadoel 25 de Marzo de 2010 como ponencia oral en el congreso “IEEE International Symposium on Broadband Multimedia Systems and Broadcasting 2010” celebrado del 24 al 26 de marzo de 2010 en Shangai (China)

Abstract: As most state-of-the-art terrestrial transmissions standards, DVB-T2 uses orthogonal frequency division multiplexing (OFDM) as modulation scheme. For performing channel estimation and equalization normally so-called frequency domain pilots are employed. As pilots are known information to the receiver, they do not carry any information and are thus overhead. Therefore, DVB-T2 also allows for a mode with nearly no frequency domain pilots, whereby the channel estimation is based on the data itself. This paper shows the high performance and throughput benefits of this pilot-free transmission and blind channel estimation technique while proposing an optimized algorithm.

Static Delays Optimization to Reduce Self-Interference in DVB-T Networks

Presentado en el IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, celebrado en Shangai (China) del 24 al 26 de marzo de 2010.

DVB-T2 modulator design supporting multiple PLP and auxiliary streams

Publicado en el IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, celebrado en Shangai (China) del 24 al 26 de marzo de 2010.

HDTV field trials using DVB-T and DVB-T2 broadcasting systems

Publicado en el IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, celebrado en Shangai (China) del 24 al 26 de marzo de 2010.

DVB-T2: New Signal Processing Algorithms for a Challenging Digital Video Broadcasting Standard

Han elaborado este capítulo del libro “Digital Video” (pp 185-206) que ha sido publicado en febrero de 2010 por InTech con ISBN: 978-953-7619-70-1.

An FFT Core for DVB-T2 Receiver

Presentado en el IEEE International Conference on Electronics, Circuits and Systems (ICECS) 2009, celebrado del 13 al 16 de diciembre 2009 en Túnez.

Publicado en la revista IEEE Transactions on Broadcasting en diciembre de 2009

Presentado en las XIX Jornadas Telecom I+D, celebradas en Madrid del 24 al 26 de noviembre de 2009

Presentado en las XIX Jornadas Telecom I+D, celebradas en Madrid del 24 al 26 de noviembre de 2009

Presentado en la conferencia IEEE NEWCAST09 celebrada en junio de 2009 en Toulouse, y en la XXIV Conference on Design of Circuits and Integrated Systems, celebrada en Zaragoza del 18 al 20 de noviembre de 2009

Presentado en la conferencia IEEE NEWCAST09 celebrada en junio de 2009 en Toulouse, y en la XXIV Conference on Design of Circuits and Integrated Systems, celebrada en Zaragoza del 18 al 20 de noviembre de 200

Presentado en la conferencia IEEE NEWCAST09 celebrada en Toulouse en junio de 2009, y en la XXIV Conference on Design of Circuits and Integrated Systems. celebrado en Zaragoza del 18 al 20 de noviembre de 2009 .

Presentado en el 9th COST2100 Management Meeting, celebrado en Viena, Austria, del 28 al 30 de septiembre de 2009

Publicado en la revista IEEE Transactions on Broadcasting. Publicado en junio de 2009.

Publicado en la revista Wiley Wireless Communications and Mobile Computing. Publicado en junio de 2009.

Publicado en: 2009 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, celebrado en Bilbao del 13 al 15 de mayo de 2009.

Estudio y comparativa de la multiplexación estática y estadística en una implementación real de un encapsulador DVB-H

Publicado en 2009 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting celebrado en Bilbao del 13 al 15 de Mayo de 2009

A 2×2 Novel MIMO Testbed for DVB-T2 Systems

Publicado en 2009 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting celebrado en Bilbao del 13 al 15 de Mayo de 2009

Coverage Optimization for DVB–T/H Single Frequency Networks using a PSO Algorithm

Publicado en 2009 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting celebrado en Bilbao del 13 al 15 de Mayo de 2009

MIMO performance of the next generation DVB-T

Publicado en el IEEE Vehicular Technology Conference (VTC), celebrado del 26 al 29 de Abril de 2009 en Barcelona

Publicado en el IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, celebrado en Las Vegas (EEUU), del 31 de Marzo al 2 de Abril de 2008

Publicado en en VLSI Design, vol. 2008, Article ID 610420, 9 pages, 2008. doi:10.1155/2008/610420 en su número de enero 2008