TY - CONF T1 - Multibeam Compact Dual Reflectarray Antenna for High-Throughput Satellites in Ka-Band T2 - 18th European Conference on Antennas and Propagation Y1 - 2024 A1 - Daniel Martínez-de-Rioja A1 - Eduardo Martínez-de-Rioja A1 - Y Rodríguez-Vaqueiro A1 - A Pino A1 - Carlos Mosquera A1 - José A. Encinar A1 - Giovanni Toso JF - 18th European Conference on Antennas and Propagation ER - TY - JOUR T1 - Contribution of non-orthogonal multiple access signalling to practical multibeam satellite deployments JF - International Journal of Satellite Communications and Networking Y1 - 2023 A1 - Tomás Ramírez A1 - Carlos Mosquera ER - TY - CONF T1 - Direction of Arrival Estimation with Hybrid Digital Analog Arrays: Algorithms and Ziv-Zakai Lower Bound T2 - Asilomar Conference on Signals, Systems, and Computers Y1 - 2023 A1 - Miguel Rivas-Costa A1 - Carlos Mosquera JF - Asilomar Conference on Signals, Systems, and Computers ER - TY - JOUR T1 - Link Adaptation for Rate Splitting Systems with Partial CSIT JF - IEEE Journal on Selected Areas in Communications Y1 - 2023 A1 - Carlos Mosquera A1 - Felipe Gómez-Cuba ER - TY - CONF T1 - Overview of Use Cases in Single Channel Full Duplex Techniques for Satellite Communication T2 - 40th International Communications Satellite Systems Conference (ICSSC) Y1 - 2023 A1 - Víctor Monzón Baeza A1 - Carlos Mosquera A1 - Roberto López-Valcarce A1 - JL González-Ríos A1 - JA Vasquez-Peralvo A1 - Tomás Ramírez A1 - P Losada A1 - JC Merlano A1 - S Chatzinotas A1 - Steven Kisseleff JF - 40th International Communications Satellite Systems Conference (ICSSC) ER - TY - CONF T1 - Contribution of NOMA Signalling to Practical Multibeam Satellite Deployments T2 - 11th Advanced Satellite Multimedia Conference and 17th Signal Processing for Space Communications Workshop Y1 - 2022 A1 - Tomás Ramírez A1 - Carlos Mosquera JF - 11th Advanced Satellite Multimedia Conference and 17th Signal Processing for Space Communications Workshop ER - TY - CONF T1 - A Dynamic Codebook Design for Analog Beamforming in MIMO LEO Satellite Communications T2 - IEEE International Conference on Communications (ICC) Y1 - 2022 A1 - Joan Palacios A1 - Nuria González-Prelcic A1 - Carlos Mosquera JF - IEEE International Conference on Communications (ICC) ER - TY - JOUR T1 - Flexible User Mapping for Radio Resource Assignment in Advanced Satellite Payloads JF - IEEE Transactions on Broadcasting Y1 - 2022 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Nader Alagha ER - TY - JOUR T1 - Editorial: Signal Processing for Beyond 5G Non-Terrestrial Networks JF - Frontiers in Space Technologies Y1 - 2021 A1 - Carlos Mosquera A1 - Pantelis-Daniel Arapoglou VL - 2 UR - https://www.frontiersin.org/articles/10.3389/frspt.2021.780171/full ER - TY - CONF T1 - Flexible Beam-User Mapping for Multibeam Satellites T2 - 9th European Signal Processing Conference, EUSIPCO 2021 Y1 - 2021 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Nader Alagha JF - 9th European Signal Processing Conference, EUSIPCO 2021 CY - Dublin, Irlanda ER - TY - JOUR T1 - A Hybrid Beamforming Design for Massive MIMO LEO Satellite Communications JF - Frontiers in Space Technologies Y1 - 2021 A1 - Joan Palacios A1 - Nuria González-Prelcic A1 - Carlos Mosquera A1 - Takayuki Shimizu A1 - Chang-Heng Wang VL - 2 UR - https://www.frontiersin.org/articles/10.3389/frspt.2021.696464/full ER - TY - CONF T1 - Non-Orthogonal Transmission Under Flexible Illumination Patterns For Advanced Satellite Payloads T2 - 38th International Communications Satellite Systems Conference (ICSSC), Y1 - 2021 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Nader Alagha JF - 38th International Communications Satellite Systems Conference (ICSSC), CY - Washington DC, USA ER - TY - JOUR T1 - Space-Time Rate Splitting for the MISO BC with Magnitude CSIT JF - IEEE Transactions on Communications Y1 - 2021 A1 - Carlos Mosquera A1 - Nele Noels A1 - Tomás Ramírez A1 - Màrius Caus A1 - Adriano Pastore ER - TY - JOUR T1 - Link Adaptation and SINR errors in Practical Multicast Multibeam Satellite Systems with Linear Precoding JF - International Journal of Satellite Communications and Networking Y1 - 2020 A1 - Anxo Tato A1 - Stefano Andrenacci A1 - Eva Lagunas A1 - Symeon Chatzinotas A1 - Carlos Mosquera KW - link adaptation KW - multi-beam satellite KW - precoding KW - satellite communications ER - TY - JOUR T1 - Neural Network Aided Computation of Mutual Information for Adaptation of Spatial Modulation JF - IEEE Transactions on Communications Y1 - 2020 A1 - Anxo Tato A1 - Carlos Mosquera A1 - Pol Henarejos A1 - Ana Pérez Neira KW - ACM KW - Adaptive Communications KW - Capacity KW - Index Modulation KW - link adaptation KW - Machine Learning KW - MFNN KW - Mutual Information KW - neural networks KW - Polarized Modulation KW - Spatial Modulation AB -

Index Modulations, in the form of Spatial Modulation or Polarized Modulation, are gaining traction for both satellite and terrestrial next generation communication systems. Adaptive Spatial Modulation based links are needed to fully exploit the transmission capacity of time-variant channels. The adaptation of code and/or modulation requires a real-time evaluation of the channel achievable rates. Some existing results in the literature present a computational complexity which scales quadratically with the number of transmit antennas and the constellation order. Moreover, the accuracy of these approximations is low and it can lead to wrong Modulation and Coding Scheme selection. In this work we apply a Multilayer Feedforward Neural Network to compute the achievable rate of a generic Index Modulation link. The case of two antennas/polarizations is analyzed in depth, showing not only a one-hundred fold decrement of the Mean Square Error in the estimation of the capacity as compared with existing analytical approximations, but also a fifty times reduction of the computational complexity. Moreover, the extension to an arbitrary number of antennas is explained and supported with simulations. More generally, neural networks can be considered as promising candidates for the practical estimation of complex metrics in communication related settings.

SN - 1558-0857 ER - TY - CONF T1 - Non-coherent rate-splitting for multibeam satellite forward link: practical coding and decoding algorithms T2 - IEEE 91st Vehicular Technology Conference (VTC2020-Spring), 25-28 May 2020, virtual event. Y1 - 2020 A1 - Nele Noels A1 - Marc Moeneclaey A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Màrius Caus A1 - Adriano Pastore JF - IEEE 91st Vehicular Technology Conference (VTC2020-Spring), 25-28 May 2020, virtual event. ER - TY - CONF T1 - On the Performance of Advanced Reflectarray Configurations for Multibeam Satellite Communications T2 - XXXV Simposio Nacional de la Unión Científica Internacional de Radio, URSI 2020 Y1 - 2020 A1 - Tomás Ramírez A1 - Daniel Martínez de Rioja A1 - Eduardo Martínez de Rioja A1 - Carlos Mosquera A1 - José A. Encinar JF - XXXV Simposio Nacional de la Unión Científica Internacional de Radio, URSI 2020 ER - TY - CONF T1 - Resource Management in the multibeam NOMA-based satellite downlink T2 - 45th International Conference on Acoustics, Speech, and Signal Processing (ICASSP) Y1 - 2020 A1 - Tomás Ramírez A1 - Carlos Mosquera JF - 45th International Conference on Acoustics, Speech, and Signal Processing (ICASSP) ER - TY - CONF T1 - Study on the Application of NOMA Techniques for Heterogeneous Satellite Terminals T2 - 10th Advanced Satellite Multimedia Systems Conference (ASMS) and 16th Signal Processing for Space Communications Workshop (SPSC) Y1 - 2020 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Nele Noels A1 - Màrius Caus A1 - Joan Bas A1 - Luis Blanco A1 - Nader Alagha JF - 10th Advanced Satellite Multimedia Systems Conference (ASMS) and 16th Signal Processing for Space Communications Workshop (SPSC) ER - TY - JOUR T1 - Two-Level Frame Precoding with non-Cooperative Gateways JF - EURASIP Journal on Wireless Communications and Networking Y1 - 2020 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - R. López-Valcarce KW - myrada KW - satcom KW - winter UR - https://rdcu.be/b5KB3 ER - TY - CONF T1 - Deep Learning Assisted Rate Adaptation in Spatial Modulation Links T2 - 16th International Symposium on Wireless Communication Systems (ISWCS) Y1 - 2019 A1 - Anxo Tato A1 - Carlos Mosquera KW - Deep Learning KW - link adaptation KW - Machine Learning KW - Spatial Modulation AB -

The adaptation of Spatial Modulation based links to the channel conditions is challenged by the complicated dependence between performance (either error rate metrics or theoretically achievable rates) and the multiple antenna channel description. In this paper a coding rate selection mechanism is presented based on a carefully selected set of channel features and the proper training of a deep neural network, which all together can satisfy a given error rate bound.

JF - 16th International Symposium on Wireless Communication Systems (ISWCS) CY - Oulu (Finland) ER - TY - CONF T1 - Neural Network Aided Computation of Generalized Spatial Modulation Capacity T2 - 27th European Signal Processing Conference (EUSIPCO) Y1 - 2019 A1 - Anxo Tato A1 - Carlos Mosquera A1 - Pol Henarejos A1 - Ana Pérez-Neira KW - Generalized Spatial Modulation KW - Index Modulations KW - Machine Learning KW - Multilayer Feedforward Neural Network KW - Polarized Modulation AB -

Generalized Spatial Modulation (GSM) is being considered for future high-capacity and energy efficient terrestrial networks. A variant such as Polarized Modulation (PMod) has also a role in Dual Polarization Mobile Satellite Systems. The implementation of adaptive GSM systems requires fast methods to evaluate the channel dependent GSM capacity, which amounts to solve multi-dimensional integrals without closed-form solutions. For this purpose, we propose the use of a Multilayer Feedforward Neural Network and an associated feature selection algorithm. The resulting method is highly accurate and with much lower complexity than alternative numerical methods.

JF - 27th European Signal Processing Conference (EUSIPCO) CY - A Coruña (Spain) ER - TY - JOUR T1 - Partial-Duplex Amplify-and-Forward Relaying: Spectral Efficiency Analysis under Self-Interference JF - IEEE Transactions on Wireless Communications Y1 - 2019 A1 - R. López-Valcarce A1 - C. Mosquera KW - full-duplex KW - myrada KW - winter AB -
We propose a novel mode of operation for Amplify-and-
Forward relays in which the spectra of the relay input and
output signals partially overlap. This partial-duplex relaying mode
encompasses half- and full-duplex as particular cases. By viewing
the partial-duplex relay as a bandwidth-preserving Linear
Periodically Time-Varying system, a spectral efficiency analysis
under self-interference is developed. In contrast with previous
works, self-interference is regarded as a useful informationbearing
component rather than simply assimilated to noise. This
approach reveals that previous results regarding the impact of
self-interference on (full-duplex) relay performance are overly
pessimistic. Based on a frequency-domain interpretation of the
effect of self-interference, a number of suboptimal decoding
architectures at the destination node are also discussed. It is found
that the partial-duplex relaying mode may provide an attractive
tradeoff between spectral efficiency and receiver complexity.
VL - 18 IS - 4 ER - TY - CONF T1 - Spatial Modulation for Beyond 5G Communications: Capacity Calculation and Link Adaptation T2 - 2nd XoveTIC Conference Y1 - 2019 A1 - Anxo Tato A1 - Carlos Mosquera KW - 5G KW - adaptive coding and modulation KW - Deep Learning KW - link adaptation KW - Machine Learning KW - neural networks KW - Spatial Modulation JF - 2nd XoveTIC Conference CY - A Coruña (Spain) ER - TY - CONF T1 - Spatial Modulation Link Adaptation: a Deep Learning Approach T2 - 2019 53rd Asilomar Conference on Signals, Systems, and Computers Y1 - 2019 A1 - Anxo Tato A1 - Carlos Mosquera JF - 2019 53rd Asilomar Conference on Signals, Systems, and Computers CY - California ER - TY - CONF T1 - Adjacent Beams Resource Sharing to Serve Hot Spots : A Rate Splitting Approach T2 - 36th International Communications Satellite Systems Conference (ICSSC) Y1 - 2018 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Màrius Caus A1 - Adriano Pastore A1 - Nader Alagha A1 - Nele Noels AB -
This work addresses the uneven traffic demand scenario in multi-beam satellite systems, in which a hot-spot beam
is surrounded by cold beams. After partitioning the hotspot beam in different sectors, resource pulling from cold
neighbouring beams is allowed following an aggressive frequency-reuse scheme. As a consequence, the level of
the co-channel interference within the hot-spot beam increases. A scheme known as Non-Coherent Rate-Splitting (NCRS)
is employed to cope with this interference, based on the exclusive use of magnitude channel state information at the transmitter (CSIT).
The receiver complexity is increased with respect to full CSIT precoding schemes, which are considered for benchmarking purposes. Different NCRS strategies are analyzed and compared with several partial and full CSIT schemes. The proposed solution not only shows an improvement with respect to partial CSIT benchmarks, but also displays a competitive performance against full CSIT precoders.
JF - 36th International Communications Satellite Systems Conference (ICSSC) CY - Niagara Falls, Canada ER - TY - CONF T1 - Channel dependent Mutual Information in Index Modulations T2 - ICCASP, IEEE International Conference on Acoustics, Speech, and Signal Processing Y1 - 2018 A1 - Pol Henarejos A1 - Ana Pérez-Neira A1 - Anxo Tato A1 - Carlos Mosquera AB -

Mutual Information is the metric that is used to perform link adaptation, which allows to achieve rates near capacity. The computation of adaptive transmission modes is achieved by employing the mapping between the Signal to Noise Ratio and the Mutual Information. Due to the high complexity of the computation of the Mutual Information, this process is performed off-line via Monte Carlo simulations, whose results are stored in look-up tables. However, in Index Modulations, such as Spatial Modulation or Polarized Modulation, this is not feasible since the constellation and the Mutual Information are channel dependent and it would require to compute this metric at each time instant if the channel is time varying. In this paper, we propose different approximations in order to obtain a simple closed-form expression that allows to compute the Mutual Information at each time instant and thus, making feasible the link adaptation.

JF - ICCASP, IEEE International Conference on Acoustics, Speech, and Signal Processing ER - TY - JOUR T1 - Distributed Precoding Systems in Multi-Gateway Multibeam Satellites: Regularization and Coarse Beamforming JF - IEEE Transactions on Wireless Communication Y1 - 2018 A1 - Carlos Mosquera A1 - R. López-Valcarce A1 - Tomás Ramírez A1 - Vahid Joroughi ER - TY - CONF T1 - Exploratory Analysis of Superposition Coding and Rate Splitting for Multibeam Satellite Systems T2 - 15th International Symposium on Wireless Communication Systems (ISWCS) Y1 - 2018 A1 - Màrius Caus A1 - Adriano Pastore A1 - Mònica Navarro A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Nele Noels A1 - Nader Alagha A1 - Ana I. Perez-Neira JF - 15th International Symposium on Wireless Communication Systems (ISWCS) CY - Lisbon, Portugal ER - TY - CONF T1 - Link Adaptation and Carriers Detection Errors in Multibeam Satellite Systems with Linear Precoding T2 - 9th Advanced Satellite Multimedia Systems Conference (ASMS) and 15th Signal Processing for Space Communications Workshop (SPSC) Y1 - 2018 A1 - Anxo Tato A1 - Stefano Andrenacci A1 - Chatzinotas, S. A1 - Carlos Mosquera AB -

The application of linear precoding at the gateway side enables broadband multibeam satellite systems to use more aggressive frequency reuse patterns increasing the overall capacity of future High Throughput Satellites (HTS). However, although some previous works about precoding consider imperfect CSIT (Chanel State Information at the Transmitter) adding some CSI estimation errors, that is not the main cause of CSI degradation. In practice, receivers can only detect and estimate a few coefficients of the CSI vector being the other nullified, replaced by zeros. This introduces errors in the SINR calculation by the gateway that lead to the assignment of Modulation and Coding Schemes (MCS) over the decoding possibilities of the users, increasing the rate of erroneous frames. In this work, the errors in the SINR calculation caused by the nullification of the CSI are analyzing statistically and geographically using a radiation diagram of 245 beams over Europe. Furthermore, a solution based on a link adaptation algorithm with a per user adaptive margin is proposed, helping to achieve the QEF (Quasi-error Free) target of DVB-S2X systems.
 

JF - 9th Advanced Satellite Multimedia Systems Conference (ASMS) and 15th Signal Processing for Space Communications Workshop (SPSC) CY - Berlin, Germany ER - TY - CONF T1 - Message-Splitting for Interference Cancellation in Multibeam Satellite Systems T2 - 9th Advanced Satellite Multimedia Systems Conference (ASMS) and 15th Signal Processing for Space Communications Workshop (SPSC) Y1 - 2018 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Màrius Caus A1 - Adriano Pastore A1 - Mònica Navarro A1 - Nele Noels JF - 9th Advanced Satellite Multimedia Systems Conference (ASMS) and 15th Signal Processing for Space Communications Workshop (SPSC) CY - Berlin, Germany ER - TY - CONF T1 - Practical Implementation of Link Adaptation with Dual Polarized Modulation (Best paper award) T2 - 11th International Symposium on Communication Systems, Networks, and Digital Signal Processing. Y1 - 2018 A1 - Anxo Tato A1 - Carlos Mosquera A1 - Pol Henarejos A1 - Ana Pérez-Neira JF - 11th International Symposium on Communication Systems, Networks, and Digital Signal Processing. U1 -

Best paper award

ER - TY - CONF T1 - Symbol-Asynchronous Transmission In Multibeam Satellite User Down-Link: Rate Regions For Novel Superposition Coding Schemes T2 - 6th IEEE Global Conference on Signal and Information Processing Y1 - 2018 A1 - Nele Noels A1 - Marc Moeneclaey A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Màrius Caus A1 - Adriano Pastore AB -

We consider the forward link of a multibeam satellite system with high spectral reuse and the novel low-complexity transmission and detection strategies from ["“Exploratory analysis of superposition coding and rate splitting for multibeam satellite systems", ISWCS 2018]. More specifically, we study the impact of a time offset between the antenna beams that cooperate to simultaneously serve a given user. Assuming Gaussian signaling, we provide closed-form expressions for the achievable rate region. It is demonstrated that, in the absence of timing information at the gateway, this region is not affected by a time offset. Our numerical results further show that, in case timing is known at the gateway, an offset of half a symbol period at both user terminals is optimal in terms of spectral efficiency.

JF - 6th IEEE Global Conference on Signal and Information Processing ER - TY - CONF T1 - Two-Level Precoding for High Throughput Satellites with non-Cooperative Gateways T2 - 22nd International Workshop on Smart Antennas (WSA) Y1 - 2018 A1 - Tomás Ramírez A1 - Carlos Mosquera A1 - Roberto López-Valcarce JF - 22nd International Workshop on Smart Antennas (WSA) ER - TY - CONF T1 - Distributed Precoding Systems in Multi-Gateway Multibeam Satellites T2 - 35th AIAA International Communications Satellite Systems Conference Y1 - 2017 A1 - Carlos Mosquera A1 - R. López-Valcarce A1 - Tomás Ramírez KW - precoding KW - satcom JF - 35th AIAA International Communications Satellite Systems Conference CY - Trieste,Italy ER - TY - JOUR T1 - FER Estimation in a Memoryless BSC with Variable Frame Length and Unreliable ACK/NAK Feedback JF - IEEE Transactions on Wireless Communications Y1 - 2017 A1 - Alberto Rico-Alvariño A1 - R. López-Valcarce A1 - Carlos Mosquera A1 - Robert W. Heath Jr. KW - adaptive signal processing KW - compass KW - Cramér-Rao bound (CRB) KW - frame error rate KW - myrada KW - winter AB -
We consider the problem of estimating the frame error rate (FER) of a given memoryless binary symmetric channel by observing the success or failure of transmitted packets. Whereas FER estimation is relatively straightforward if all observations correspond to packets with equal length, the problem becomes considerably more complex when this is not the case. We develop FER estimators when
transmissions of different lengths are observed, together with the Cramer-Rao Lower Bound (CRLB). Although the main focus is on Maximum Likelihood (ML) estimation, we also obtain low complexity schemes performing close to optimal in some scenarios. In a second stage, we consider the case in which FER estimation is performed at a node different from the receiver, and incorporate the impairment of unreliable observations by considering noisy ACK/NAK feedback links. The impact of unreliable feedback is analyzed by means of the corresponding CRLB. In this setting, the ML estimator is obtained by applying the Expectation-Maximization algorithm to jointly estimate the error probabilities of the data and feedback links. Simulation results illustrate the benefits of the proposed estimators.
VL - 16 IS - 6 ER - TY - Generic T1 - Link Adaptation Algorithms for Dual Polarization Mobile Satellite Systems T2 - 9th EAI International Conference on Wireless and Satellite Systems, WISATS Y1 - 2017 A1 - Anxo Tato A1 - Pol Henarejos A1 - Carlos Mosquera A1 - Ana Pérez-Neira AB -

The use of dual polarization in mobile satellite systems is
very promising as a means for increasing the transmission capacity. In this paper a system which uses simultaneously two orthogonal polarizations in order to communicate with the users is studied. The application of MIMO signal processing techniques along with Adaptive Coding and Modulation in the forward link can provide remarkable throughput gains up to 100 % when compared with the single polarization system. The gateway is allowed to vary the MIMO and Modulation  and Coding Schemes for each frame. The selection is done by means of a link adaptation algorithm which uses a tunable margin to achieve a predefined target Frame Error Rate.

JF - 9th EAI International Conference on Wireless and Satellite Systems, WISATS PB - Springer International Publishing CY - Oxford VL - Wireless and Satellite Systems ER - TY - CONF T1 - Advanced Signal Processing Techniques for Fixed and Mobile Satellite Communications T2 - 8th Advanced Satellite Multimedia Systems Conference 14th Signal Processing for Space Communications Workshop Y1 - 2016 A1 - Pol Henarejos A1 - Ana Pérez-Neira A1 - Nicolò Mazzali A1 - Carlos Mosquera KW - compass KW - full duplex KW - satcom JF - 8th Advanced Satellite Multimedia Systems Conference 14th Signal Processing for Space Communications Workshop ER - TY - CONF T1 - Bandwidth Allocation in Partial Duplex Relaying T2 - The 17th IEEE International workshop on Signal Processing advances in Wireless Communications (SPAWC) Y1 - 2016 A1 - Carlos Mosquera A1 - R. López-Valcarce KW - compass KW - full duplex KW - relay JF - The 17th IEEE International workshop on Signal Processing advances in Wireless Communications (SPAWC) CY - Edinburgh, UK ER - TY - CONF T1 - Full-duplex operation in two-way broadcast service for maritime applications T2 - 8th Advanced Satellite Multimedia Systems Conference and 14th Signal Processing for Space Communications Workshop Y1 - 2016 A1 - Tomás Ramírez A1 - Carlos Mosquera KW - compass KW - full duplex KW - satcom JF - 8th Advanced Satellite Multimedia Systems Conference and 14th Signal Processing for Space Communications Workshop ER - TY - CONF T1 - The impact of feeder link interference in multiple gateway multibeam satellite systems T2 - 8th Advanced Satellite Multimedia Systems Conference 14th Signal Processing for Space Communications Workshop Y1 - 2016 A1 - Vahid Joroughi A1 - Carlos Mosquera KW - compass KW - satcom JF - 8th Advanced Satellite Multimedia Systems Conference 14th Signal Processing for Space Communications Workshop ER - TY - CONF T1 - Link adaptation in mobile satellite links: field trials results T2 - 8th Advanced Satellite Multimedia Systems Conference and 14th Signal Processing for Space Communications Workshop Y1 - 2016 A1 - Anxo Tato A1 - Carlos Mosquera A1 - Iago Gómez KW - compass KW - satcom JF - 8th Advanced Satellite Multimedia Systems Conference and 14th Signal Processing for Space Communications Workshop ER - TY - JOUR T1 - Link adaptation in mobile satellite links: schemes for different degrees of CSI knowledge JF - International Journal of Satellite Communications and Networking Y1 - 2016 A1 - Alberto Rico-Alvariño A1 - Jesus Arnau A1 - Carlos Mosquera KW - compass KW - satcom VL - 34 IS - 5 ER - TY - CONF T1 - Wideband self-interference cancellation for better spectrum use T2 - IEEE WoWMoM 2016 Workshop on Fifth Generation Wireless Y1 - 2016 A1 - Carlos Mosquera KW - adaptive signal processing KW - compass KW - full duplex JF - IEEE WoWMoM 2016 Workshop on Fifth Generation Wireless ER - TY - CONF T1 - Blind Satellite Inter-Gateway Interference Mitigation T2 - IEEE International Conference on Communications (ICC) Y1 - 2015 A1 - J. Arnau A1 - C. Mosquera KW - compass KW - satcom JF - IEEE International Conference on Communications (ICC) ER - TY - JOUR T1 - Cramér-Rao Bounds for SNR Estimation of Oversampled Linearly Modulated Signals JF - IEEE Trans. Signal Processing Y1 - 2015 A1 - R. López-Valcarce A1 - J. Villares A1 - J. Riba A1 - W. Gappmair A1 - C. Mosquera KW - adaptive signal processing KW - compass KW - Cramér-Rao bound (CRB) KW - dynacs KW - oversampling KW - Signal-to-noise ratio (SNR) AB -
Most Signal-to-noise ratio (SNR) estimators use the
receiver matched filter output sampled at the symbol rate, an
approach which does not preserve all information in the analog
waveform due to aliasing. Thus, it is relevant to ask whether
avoiding aliasing could improve SNR estimation. To this end, we
compute the corresponding data-aided (DA) and non-data-aided
(NDA) Cramér-Rao bounds (CRBs). We adopt a novel dual filter
framework, which is shown to be information-preserving under
suitable conditions and considerably simplifies the analysis. It is
shown that the CRB can be substantially reduced by exploiting
any available excess bandwidth, depending on the modulation
scheme, the SNR range, and the estimator (DA or NDA) type.
VL - 63 IS - 7 ER - TY - CONF T1 - Frequency Reuse in Dual Satellite Settings: an Initial Evaluation of Full Duplex Operation T2 - IEEE International Conference on Communications (ICC) Y1 - 2015 A1 - D. Martiñán-Otero A1 - C. Mosquera KW - compass KW - full duplex KW - satcom JF - IEEE International Conference on Communications (ICC) ER - TY - CHAP T1 - Multibeam Joint Detection T2 - Cooperative and Cognitive Satellite Systems Y1 - 2015 A1 - J. Arnau A1 - R. de Lamare A1 - C. Mosquera KW - satcom JF - Cooperative and Cognitive Satellite Systems PB - Elsevier ER - TY - CONF T1 - Pushing for higher rates and efficiency in Satcom: the different perspectives within SatNExIV T2 - Twelfth International Symposium on Wireless Communication Systems (ISWCS) Y1 - 2015 A1 - Miguel Ángel Vázquez A1 - Ana Pérez Neira A1 - Carlos Mosquera A1 - Bhavani Shankar A1 - Pol Henarejos A1 - Athanasios Panagopoulos A1 - Giovanni Giambene A1 - Vasilios Siris A1 - George Polyzos A1 - Nader Alagha KW - satcom JF - Twelfth International Symposium on Wireless Communication Systems (ISWCS) CY - Brussels ER - TY - CONF T1 - Robust Adaptive Coding and Modulation Scheme for the Mobile Satellite Forward Link T2 - IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC Y1 - 2015 A1 - Alberto Rico-Alvariño A1 - Anxo Tato A1 - Carlos Mosquera KW - compass KW - satcom JF - IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC ER - TY - CONF T1 - Balancing Closed and Open Loop CSI in Mobile Satellite Link Adaptation T2 - Proc. ASMS & SPSC Y1 - 2014 A1 - Alberto Rico-Alvariño A1 - Arnau, Jesus A1 - Carlos Mosquera KW - dynacs KW - satcom JF - Proc. ASMS & SPSC CY - Livorno, Italy U1 -

Best paper award

ER - TY - CONF T1 - Dissection of multibeam satellite communications with a large-scale antenna system toolbox T2 - European Wireless 2014 (EW2014) Y1 - 2014 A1 - Arnau, Jesus A1 - Carlos Mosquera KW - dynacs KW - large-scale analysis KW - Massive MIMO KW - multibeam satellites KW - Multiuser detection KW - satcom AB -

Current multibeam satellite systems consist of a very large number of spot beams. In this paper, we analyze them from the large scale MIMO perspective, and establish a comparison with massive MIMO systems. It will be shown that the large number of beams has important operational implications, and that it simplifies the analysis because it allows using asymptotic results. However, it will also be shown that multibeam satellite systems cannot be considered massive MIMO systems.

JF - European Wireless 2014 (EW2014) CY - Barcelona, Spain ER - TY - CONF T1 - FER prediction with variable codeword length T2 - ICASSP2014 - Signal Processing for Communications and Networking (ICASSP2014 - SPCOM) Y1 - 2014 A1 - Alberto Rico-Alvariño A1 - Robert W. Heath Jr. A1 - Carlos Mosquera KW - adaptive signal processing KW - compass KW - dynacs KW - Effective SNR KW - FER prediction KW - PHY abstraction AB -

Frame error rate (FER) prediction in wireless communication systems is an important tool with applications to system level simulations and link adaptation, among others. Although in realistic communication scenarios it is expected to have codewords of different lengths, previous work on FER prediction marginally treated the dependency of the FER on the codeword length. In this paper, we present a method to estimate the FER using codewords of different length. We derive a low complexity FER estimator for frames of different length transmitted over a binary symmetric channel of unknown error probability. We extend this technique to coded systems by the use of effective SNR FER predictors. The proposed estimation scheme is shown to outperform other simpler estimation methods.

JF - ICASSP2014 - Signal Processing for Communications and Networking (ICASSP2014 - SPCOM) CY - Florence, Italy ER - TY - JOUR T1 - Performance of the Multibeam Satellite Return Link with Correlated Rain Attenuation JF - IEEE Transactions on Wireless Communications Y1 - 2014 A1 - Arnau, Jesus A1 - Christopoulos, D. A1 - Chatzinotas, S. A1 - C. Mosquera A1 - Ottersten, B. KW - Antennas KW - Approximation methods KW - Attenuation KW - Correlation KW - dynacs KW - Rain KW - satcom KW - Satellites KW - Signal to noise ratio AB -

Rain attenuation is among the major impairments for satellite systems operating in the K band and above. In this paper, we investigate the impact of spatially correlated rain attenuation on the performance of a multibeam satellite return link. For a comprehensive assessment, an analytical model for the antenna pattern that generates the beams is also proposed. We focus on the outage capacity of the link, and obtain analytical approximations at high and low SNR. The derived approximations provide insights on the effect of key system parameters – like the inter-user distance, the satellite beam radius, or the rain intensity– and simulation results show that it fits tightly to the Monte Carlo results. Additionally, the derived expressions can be easily particularized for the single-user case, providing some novel insights.

ER - TY - CONF T1 - Analytical Characterization of the Single Frequency Network Gain Using Effective SNR Metrics T2 - The Tenth International Symposium on Wireless Communication Systems 2013 (ISWCS 2013) Y1 - 2013 A1 - Alberto Rico-Alvariño A1 - C. Mosquera KW - broadcasting KW - dynacs KW - Effective SNR metrics KW - Single Frequency Network AB -

The design of broadcasting networks operating in a single frequency way is challenging due to the difficulty of predicting the performance in a frequency selective channel, caused by natural multipath and echoes coming from different transmitters. In this paper we resort to the use of frame error rate prediction metrics (also known as effective SNR metrics) to characterize the performance gain (or loss) under different multipath and SNR regimes in a simplified scenario with two transmitters. The analysis shows clearly that receivers with a dominant line of sight reception and high SNR are more sensitive to the presence of echoes, while those users in low SNR or strong multipath conditions are easily enforced by the insertion of a second transmitter.

JF - The Tenth International Symposium on Wireless Communication Systems 2013 (ISWCS 2013) CY - Ilmenau, Germany ER - TY - Generic T1 - Cross Layer Link Adaptation in Time Varying Mobile Satellite Channels with Statistical and Outdated CSIT T2 - Asilomar Conference on Signals Systems and Computers Y1 - 2013 A1 - Alberto Rico-Alvariño A1 - J. Arnau A1 - Carlos Mosquera KW - dynacs KW - satcom JF - Asilomar Conference on Signals Systems and Computers ER - TY - JOUR T1 - MMSE Performance Analysis of Generalized Multibeam Satellite Channels JF - Communications Letters, IEEE Y1 - 2013 A1 - Christopoulos, D. A1 - J. Arnau A1 - Chatzinotas, S. A1 - C. Mosquera A1 - Ottersten, B. KW - dynacs KW - linear minimum mean square error receivers KW - multibeam satellites KW - Multiuser detection KW - return link KW - satcom ER - TY - CONF T1 - Open Loop Adaptive Coding and Modulation for Mobile Satellite Return Links T2 - 31st AIAA International Communications Satellite Systems Conference Y1 - 2013 A1 - Arnau, Jesus A1 - Carlos Mosquera KW - dynacs KW - link adaptation KW - satcom JF - 31st AIAA International Communications Satellite Systems Conference PB - American Institute of Aeronautics and Astronautics CY - Florence, Italy U1 -

http://dx.doi.org/10.2514/6.2013-5704

ER - TY - CONF T1 - Statistical Cross Layer Adaptation in Fast Fading Mobile Satellite Channels T2 - Globecom 2013 - Symposium on Selected Areas in Communications (GC13 SAC) Y1 - 2013 A1 - Alberto Rico-Alvariño A1 - J. Arnau A1 - C. Mosquera KW - dynacs KW - fast fading channels KW - link adaptation KW - mobile satellite KW - satcom AB -

Link adaptation in mobile satellite channels is difficult because of the large propagation delays, the frequent signal blockage and the variation of the channel statistics. In this paper, we propose a cross-layer link adaptation strategy that exploits statistical, long-term CSI to increase the throughput when some retransmissions are available; this increase is obtained while meeting a target outage probability constraint. Our strategy takes as inputs the estimated packet error rates of the available modulation and coding schemes (MCS) and their rates; as an output, it returns the optimum sequence of MCS to be used. Results will also show that simple information acquisition strategies can still provide very good results.

JF - Globecom 2013 - Symposium on Selected Areas in Communications (GC13 SAC) CY - Atlanta, USA ER - TY - JOUR T1 - An Adaptive Feedback Canceller for Full-Duplex Relays Based on Spectrum Shaping JF - IEEE J. Selected Areas in Communications Y1 - 2012 A1 - R. López-Valcarce A1 - Emilio Antonio-Rodríguez A1 - C. Mosquera A1 - Fernando Pérez-González KW - adaptive signal processing KW - dynacs KW - full duplex AB -
Although full-duplex relaying schemes are appealing in order to improve spectral efficiency, simultaneous reception and transmission in the same frequency results in selfinterference,
distorting the retransmitted signal and making the relay prone to oscillation. Current feedback cancellation techniques by means of adaptive filters are hampered by the fact that the useful and interference signals are highly correlated. We present a new adaptive algorithm which effectively and blindly
restores the spectral shape of the desired signal. In contrast
with previous schemes, the novel adaptive feedback canceller has low complexity, does not introduce additional delay in the relay station, and partly compensates for multipath propagation.
VL - 30 IS - 8 ER - TY - CONF T1 - Adaptive Transmission Techniques for Mobile Satellite Links T2 - 30th AIAA International Communications Satellite Systems Conference (ICSSC) Y1 - 2012 A1 - Arnau, Jesus A1 - Alberto Rico-Alvariño A1 - C. Mosquera KW - dynacs KW - satcom JF - 30th AIAA International Communications Satellite Systems Conference (ICSSC) CY - Ottawa, Canada U1 -
Best Proffesional Paper Award
ER - TY - CONF T1 - On the Effect of Echoes in Hybrid Terrestrial-Satellite Single Frequency Networks: Analysis and Countermeasures T2 - 2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC) (ASMS/SPSC 2012) Y1 - 2012 A1 - Alberto Rico-Alvariño A1 - C. Mosquera KW - dynacs KW - Effective SNR KW - Hybrid Terrestrial- Satellite KW - satcom KW - Satellite OFDM KW - Single Frequency Network KW - Space-Time Coding AB -

Hybrid Terrestrial Satellite Single Frequency Networks achieve large spectral efficiencies due to a higher frequency reuse, which is attained by transmitting the same waveform in the same frequency band from satellite and terrestrial transmitters. However, the presence of multiple transmitters propitiates the existence of the so-called SFN echoes, which can degrade the system performance even if they arrive within the OFDM guard interval. In this paper we characterize this effect by resorting to PER prediction metrics (or effective SNR metrics), and analyze two simple preprocessing schemes that mitigate this degradation: the use of Alamouti space-time codes, and a convenient prefiltering at the terrestrial transmitter.

JF - 2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC) (ASMS/SPSC 2012) CY - Baiona, Spain ER - TY - CONF T1 - Multiuser Detection Performance in Multibeam Satellite Links under Imperfect CSI T2 - ASILOMAR 2012 Y1 - 2012 A1 - Arnau, Jesus A1 - C. Mosquera KW - dynacs KW - satcom JF - ASILOMAR 2012 CY - Pacific Grove, CA U1 -
Accepted for publication
ER - TY - CONF T1 - Optimum Training for CSI Acquisition in Cognitive Radio Channels T2 - Asilomar Conference on Signals, Systems, and Computers Y1 - 2012 A1 - Alberto Rico-Alvariño A1 - C. Mosquera KW - adaptive signal processing KW - cognitive radio KW - dynacs JF - Asilomar Conference on Signals, Systems, and Computers CY - Pacific Grove, CA ER - TY - JOUR T1 - Overlay Cognitive Transmission in a Multicarrier Broadcast Network with Dominant Line of Sight Reception JF - IEEE Transactions on Wireless Communications Y1 - 2012 A1 - Alberto Rico-Alvariño A1 - C. Mosquera A1 - Fernando Pérez-González KW - cognitive radio KW - dynacs KW - satcom ER - TY - CONF T1 - Overlay cognitive transmission in OFDM point to point systems exploiting primary feedback T2 - 3rd International Workshop on Cognitive Information Processing (CIP) Y1 - 2012 A1 - Alberto Rico-Alvariño A1 - C. Mosquera KW - cognitive radio KW - dynacs AB -

A secondary user that tries to reuse the spectrum allocated to a primary user can exploit the knowledge of the primary message to perform this task. In particular, the overlay  cognitive radio paradigm postulates the use of a fraction of the available power at the secondary transmitter to convey the primary message, so the spectral efficiency of the primary  system is increased, and, therefore, some transmission resources (time slots or frequency bands) can be released to the secondary transmission while the primary user rate is kept constant. The fraction of released resources can be incremented if some channel state information is available at the secondary transmitter. In this paper, we present a scenario where the secondary transmitter maximizes the primary link quality (measured in terms of Effective SNR), and obtains its channel state information by exploiting the primary user SNR-based feedback.

JF - 3rd International Workshop on Cognitive Information Processing (CIP) CY - Baiona, Galicia, Spain ER - TY - Generic T1 - Overlay Spectrum Reuse in a Broadcast Network: Covering the Whole Grayscale of Spaces T2 - IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks (DySPAN 2012) Y1 - 2012 A1 - Alberto Rico-Alvariño A1 - C. Mosquera KW - cognitive radio KW - dynacs JF - IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks (DySPAN 2012) CY - Bellevue, WA ER - TY - CONF T1 - Overlay Spectrum Reuse in a Multicarrier Broadcast Network: Coverage Analysis T2 - The 13th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2012) Y1 - 2012 A1 - Alberto Rico-Alvariño A1 - C. Mosquera A1 - Fernando Pérez-González KW - cognitive radio KW - dynacs AB -

A secondary cognitive user overlaying its message in a broadcast multicarrier network is studied. The secondary user exploits the primary message knowledge to convey its own information while preserving the primary user coverage area, determined by a bound on the BER, and taking into account the degradation due to the insertion of an echo in a dominant line of sight environment. The results are compared with those obtained when the coverage area is defined in capacity terms, and regardless of the degradation caused by the secondary replica of the primary message.

JF - The 13th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2012) CY - Cesme, Turkey ER - TY - CONF T1 - Overlay Spectrum Reuse in a Multicarrier Broadcast Network: Single Receiver Analysis T2 - The 13th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2012) Y1 - 2012 A1 - Alberto Rico-Alvariño A1 - C. Mosquera A1 - Fernando Pérez-González KW - cognitive radio KW - dynacs AB -

The overlay cognitive radio paradigm presents a framework where a secondary user exploits the knowledge of the primary user's message to improve spectrum utilization. A multicarrier broadcast network is one of the scenarios where this knowledge is possible: the secondary user could join a single frequency network and, therefore, gain access to the primary message. However, if the primary signal is received with a strong line of sight component, its relaying from the secondary transmitter does not suffice to ensure the primary user quality of service. In this paper we study the scenario where a secondary transmitter maximizes its own transmission rate, keeping the quality of a primary receiver over a given threshold. The analytical results, based on bit error rate bounds, are verified by means of software simulations and hardware tests.

JF - The 13th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2012) CY - Cesme, Turkey ER - TY - CONF T1 - Performance Analysis of Multiuser Detection for Multibeam Satellites Under Rain Fading T2 - 2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC) (ASMS/SPSC 2012) Y1 - 2012 A1 - Arnau, Jesus A1 - C. Mosquera KW - dynacs KW - hybrid beamforming KW - multibeam satellites. KW - Multiuser detection KW - rain fading KW - satcom AB -

Multibeam satellite systems are nowadays widely employed, and their use is expected to grow in the next decades. This has raised the interest for signal processing techniques able to mitigate the interference among beams, since they could enable a much more aggressive spectrum reuse. From an engineering point of view, the design of the system must be no longer based on the capabilities provided by the usual physical layer; it should take into account the presence of these interference canceling techniques, predict their performance as accurately as possible -even under a number of impairments and non-idealities- and design accordingly in order to fully exploit them. In this paper, we investigate the effect of a practical impairment of great importance, namely, the attenuation due to the rain, on the performance of a return link which performs MMSE interference canceling. Analytical expressions are derived for a number of performance measures based on the statistical characterization of the rain attenuation.

JF - 2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC) (ASMS/SPSC 2012) CY - Baiona, Spain ER - TY - JOUR T1 - Performance study of multiuser interference mitigation schemes for hybrid broadband multibeam satellite architectures JF - EURASIP Journal on Wireless Communications and Networking Y1 - 2012 A1 - Arnau, Jesus A1 - Bertrand Devillers A1 - C. Mosquera A1 - Ana Pérez-Neira VL - 2012 UR - http://jwcn.eurasipjournals.com/content/2012/1/132 ER - TY - CONF T1 - On the Co-existence of Primary and Secondary Transmitters in a Broadcast Network T2 - International Conference on Cognitive Radio and Advanced Spectrum Management Y1 - 2011 A1 - Alberto Rico-Alvariño A1 - C. Mosquera A1 - Fernando Pérez-González KW - Broadcast KW - cognitive radio KW - Overlay KW - Single Frequency Network JF - International Conference on Cognitive Radio and Advanced Spectrum Management CY - Barcelona, Catalonia, Spain ER - TY - CONF T1 - Hybrid Space-Ground Processing for High-Capacity Multi-beam Satellite Systems T2 - IEEE GLOBECOM Y1 - 2011 A1 - Arnau, Jesus A1 - Michael Bergmann A1 - Enzo Alberto Candreva A1 - Giovanni Emanuele Corazza A1 - Riccardo {De Gaudenzi} A1 - Bertrand Devillers A1 - Wilfried Gappmair A1 - Francesco Lombardo A1 - C. Mosquera A1 - Ana Pérez-Neira A1 - Ilaria Thibault A1 - Alessandro Vanelli-Coralli JF - IEEE GLOBECOM CY - Houston, Texas, USA N1 - Selected Areas in Communications Symposium - Satellite & Space Communications Track (GC'11 - SAC - SSC) ER - TY - CONF T1 - Joint Linear Precoding and Beamforming for the Forward Link of Multi-Beam Broadband Satellite Systems T2 - IEEE GLOBECOM Y1 - 2011 A1 - Bertrand Devillers A1 - Ana Isabel Perez A1 - C. Mosquera JF - IEEE GLOBECOM CY - Houston, Texas, USA N1 - Selected Areas in Communications Symposium - Satellite & Space Communications Track (GC'11 - SAC - SSC) ER - TY - JOUR T1 - Dynamic spectrum leasing (DSL): A new paradigm for spectrum sharing in cognitive radio networks JF - IEEE Transactions on Vehicular Technology Y1 - 2010 A1 - Sudhaman K. Jayaweera A1 - Gonzalo Vázquez-Vilar A1 - C. Mosquera KW - cognitive radio KW - DSL KW - dynamic spectrum access KW - dynamic spectrum leasing KW - dynamic spectrum sharing KW - game theory KW - power control VL - 59 ER - TY - CONF T1 - Dynamic Spectrum Leasing (DSL) in Dynamic Channels T2 - ICC Workshop on Cognitive Radio Interfaces and Signal Processing (ICC CRISP) Y1 - 2010 A1 - Georges El-Howayek A1 - Sudhaman K. Jayaweera A1 - Kamrul Hakim A1 - Gonzalo Vázquez-Vilar A1 - C. Mosquera KW - cognitive radio KW - DSL KW - dynamic spectrum leasing KW - game theory KW - Rayleigh fading KW - time-varying channels KW - time-varying secondary system JF - ICC Workshop on Cognitive Radio Interfaces and Signal Processing (ICC CRISP) CY - Cape Town, South Africa ER - TY - JOUR T1 - Efficient Dynamic Spectrum Sharing in Cognitive Radio Networks: Centralized Dynamic Spectrum Leasing (C-DSL) JF - IEEE Transactions on Wireless Communications Y1 - 2010 A1 - Kamrul Hakim A1 - Sudhaman K. Jayaweera A1 - Georges El-Howayek A1 - C. Mosquera VL - 9 ER - TY - JOUR T1 - Joint NDA Estimation of Carrier Frequency/Phase and SNR for Linearly Modulated Signals JF - IEEE Signal Processing Letters Y1 - 2010 A1 - Wilfried Gappmair A1 - R. López-Valcarce A1 - C. Mosquera KW - Carrier offset estimation KW - Cramer-Rao lower bound KW - expectation-maximization algorithm KW - SNR estimation VL - 17 ER - TY - CONF T1 - Performance Analysis of Distributed Tracking with Consensus on Noisy Time-Varying Graphs T2 - Advanced Satellite Multimedia Systems Conference (ASMA) Y1 - 2010 A1 - Yongxiang Ruan A1 - Sudhaman K. Jayaweera A1 - C. Mosquera KW - connectivity graph KW - distributed local Kalman filtering KW - distributed tracking KW - distributed tracking with consensus KW - graph topology KW - network theory (graphs) KW - noisy communications links KW - noisy time-varying graphs KW - performance analysis KW - telecommunication links KW - telecommunication network topology KW - time-varying network topology KW - time-varying systems JF - Advanced Satellite Multimedia Systems Conference (ASMA) CY - Cagliari, Italy ER - TY - JOUR T1 - Primary User Enters the Game: Performance of Dynamic Spectrum Leasing in Cognitive Radio Networks JF - IEEE Transactions on Wireless Communications Y1 - 2010 A1 - Gonzalo Vázquez-Vilar A1 - C. Mosquera A1 - Sudhaman K. Jayaweera ER - TY - CONF T1 - On the Role of Differentiation for Resampling Detection T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2010 A1 - Nahuel Dalgaard A1 - C. Mosquera A1 - Fernando Pérez-González KW - cyclostationarity KW - Image forensics KW - interpolation KW - prefiltering KW - resampling detection KW - watermarking JF - IEEE International Conference on Image Processing (ICIP) PB - IEEE CY - Hong Kong, China ER - TY - JOUR T1 - SNR Estimation for Multilevel Constellations Using Higher-Order Moments JF - IEEE Transactions on Signal Processing Y1 - 2010 A1 - Marcos Álvarez-Díaz A1 - R. López-Valcarce A1 - C. Mosquera KW - Blind estimation KW - higher-order statistics KW - Moments-based estimation KW - SNR estimation VL - 58 ER - TY - JOUR T1 - Stepsize Sequence Design for Distributed Average Consensus JF - IEEE Signal Processing Letters Y1 - 2010 A1 - C. Mosquera A1 - R. López-Valcarce A1 - Sudhaman K. Jayaweera VL - 17 ER - TY - CONF T1 - Two-dimensional Statistical Test for the Presence of Almost Cyclostationarity on Images T2 - IEEE International Conference on Image Processing (ICIP) Y1 - 2010 A1 - David Vázquez-Padín A1 - C. Mosquera A1 - Fernando Pérez-González KW - cyclostationarity KW - Image forensics KW - interpolation KW - resampling factor estimation KW - spatial transformation KW - watermarking AB -

In this work, we study the presence of almost cyclostationary fields in images for the detection and estimation of digital forgeries. The almost periodically correlated fields in the two-dimensional space are introduced by the necessary interpolation operation associated with the applied spatial transformation. In this theoretical context, we extend a statistical time-domain test for presence of cyclostationarity to the two-dimensional space. The proposed method allows us to estimate the scaling factor and the rotation angle of resized and rotated images, respectively. Examples of the output of our method are shown and comparative results are presented to evaluate the performance of the two-dimensional extension.

JF - IEEE International Conference on Image Processing (ICIP) PB - IEEE CY - Hong Kong, China ER - TY - CONF T1 - Wideband Spectral Estimation from Compressed Measurements Exploiting Spectral a priori Information in Cognitive Radio Systems T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2010 A1 - Gonzalo Vázquez-Vilar A1 - R. López-Valcarce A1 - C. Mosquera A1 - Nuria González-Prelcic KW - cognitive radio KW - compressive sampling KW - Spectral estimation JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Dallas, U.S.A. ER - TY - JOUR T1 - Cramer-Rao Lower Bound and EM Algorithm for Envelope-Based SNR Estimation of Nonconstant Modulus Constellations JF - IEEE Transactions on Communications Y1 - 2009 A1 - Wilfried Gappmair A1 - R. López-Valcarce A1 - C. Mosquera VL - 57 ER - TY - CONF T1 - A Dynamic Spectrum Leasing (DSL) Framework for Spectrum Sharing in Cognitive Radio Networks T2 - Asilomar Conference on Signals, Systems and Computers Y1 - 2009 A1 - Sudhaman K. Jayaweera A1 - C. Mosquera JF - Asilomar Conference on Signals, Systems and Computers ER - TY - CONF T1 - A Unified Framework for Dynamic Spectrum Leasing (DSL) in Cognitive Radios T2 - IEEE Broadband Wireless Access Workshop Y1 - 2009 A1 - Sudhaman K. Jayaweera A1 - Kamrul Hakim A1 - C. Mosquera JF - IEEE Broadband Wireless Access Workshop N1 - colocated with Globecom ER - TY - CONF T1 - Distributed Estimation: Do Not Trust Gossips T2 - Sensor, Signal and Information Processing (SenSIP) Workshop Y1 - 2008 A1 - C. Mosquera A1 - Sudhaman K. Jayaweera KW - distributed estimation KW - sensor network JF - Sensor, Signal and Information Processing (SenSIP) Workshop CY - Sedona (Arizona) ER - TY - CONF T1 - Distributed Estimation with Noisy Exchanges T2 - IEEE International Workshop on Signal Processing Advances in Wireless Communications Y1 - 2008 A1 - C. Mosquera A1 - R. López-Valcarce A1 - Sudhaman K. Jayaweera KW - distributed estimation KW - sensor network JF - IEEE International Workshop on Signal Processing Advances in Wireless Communications CY - Recife, Brazil ER - TY - JOUR T1 - Distributed Sequential Estimation with Noisy, Correlated Observations JF - IEEE Signal Processing Letters Y1 - 2008 A1 - Sudhaman K. Jayaweera A1 - C. Mosquera VL - 15 ER - TY - CONF T1 - Entangled Kalman Filters for Cooperative Estimation T2 - IEEE Sensor Array and Multichannel Signal Processing Workshop Y1 - 2008 A1 - C. Mosquera A1 - Sudhaman K. Jayaweera KW - distributed estimation KW - sensor network JF - IEEE Sensor Array and Multichannel Signal Processing Workshop CY - Darmstadt (Germany) ER - TY - CONF T1 - Maximum Likelihood SNR Estimation for Asynchronously Oversampled OFDM Signals T2 - IEEE International Workshop on Signal Processing Advances in Wireless Communications Y1 - 2008 A1 - R. López-Valcarce A1 - C. Mosquera KW - estimation KW - ML KW - OFDM KW - SNR JF - IEEE International Workshop on Signal Processing Advances in Wireless Communications CY - Recife, Brazil ER - TY - CONF T1 - ML and EM Algorithm for non-data-aided SNR Estimation of Linearly Modulated Signals T2 - International Symposium on Communication Systems, Networks and Signal Processing (CNSDSP) Y1 - 2008 A1 - Wilfried Gappmair A1 - R. López-Valcarce A1 - C. Mosquera KW - EM KW - ML KW - SNR estimation JF - International Symposium on Communication Systems, Networks and Signal Processing (CNSDSP) ER - TY - JOUR T1 - Non-Data-Aided Symbol Rate Estimation of Linearly Modulated Signals JF - IEEE Transactions on Signal Processing Y1 - 2008 A1 - C. Mosquera A1 - Sandro Scalise A1 - R. López-Valcarce ER - TY - JOUR T1 - Quantization-Based Data-Hiding Robust to Linear Time-Invariant Filtering JF - IEEE Transactions on Information Forensics and Security Y1 - 2008 A1 - Fernando Pérez-González A1 - C. Mosquera KW - data-hiding KW - watermarking VL - 3 ER - TY - CONF T1 - SNR Estimation with Heterogeneous Frames T2 - Advanced Satellite Mobile Systems Conference Y1 - 2008 A1 - Marcos Álvarez-Díaz A1 - R. López-Valcarce A1 - C. Mosquera JF - Advanced Satellite Mobile Systems Conference CY - Bologna, Italy ER - TY - BOOK T1 - Comunicaciones Digitales Y1 - 2007 A1 - Antonio Artés-Rodríguez A1 - Fernando Pérez-González A1 - Jesús Cid-Sueiro A1 - R. López-Valcarce A1 - C. Mosquera A1 - Fernando Pérez-Cruz PB - Pearson - Prentice Hall ER - TY - CHAP T1 - Digital Satellite Communications Y1 - 2007 A1 - C. Mosquera A1 - M. L. Boucheret A1 - M. Bousquet A1 - S. Cioni A1 - Wilfried Gappmair A1 - R. Pedone A1 - Sandro Scalise A1 - P. Skoutaridis A1 - M. Villanti PB - Springer ER - TY - CHAP T1 - Digital Satellite Communications Y1 - 2007 A1 - R. Pedone A1 - G. Albertazzi A1 - P.T. Mathiopoulos A1 - C. Mosquera A1 - N. Sagias A1 - M. Villanti PB - Springer ER - TY - CONF T1 - Iterative Envelope-Based SNR Estimation for Non-Constant Modulus Constellations T2 - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Y1 - 2007 A1 - R. López-Valcarce A1 - C. Mosquera A1 - Wilfried Gappmair KW - EM KW - SNR KW - synchronization JF - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) ER - TY - CONF T1 - Non-Linear Interference Mitigation for Broadband Multimedia Satellite Systems T2 - International Workshop on Satellite and Space Communications (IWSSC) Y1 - 2007 A1 - Marcos Álvarez-Díaz A1 - Nicolas Courville A1 - C. Mosquera A1 - Gianluigi Liva A1 - Giovanni Emanuele Corazza JF - International Workshop on Satellite and Space Communications (IWSSC) CY - Salzburg, Austria ER - TY - CONF T1 - Satellite Communications: Research Trends and Open Issues T2 - International Workshop on Satellite and Space Communications (IWSSC) Y1 - 2007 A1 - Alessandro Vanelli-Coralli A1 - Giovanni Emanuele Corazza A1 - G.K. Karagiannidis A1 - P.T. Mathiopoulos A1 - D.S. Michalopoulos A1 - C. Mosquera A1 - S. Papaharalabos A1 - Sandro Scalise KW - satellite communications JF - International Workshop on Satellite and Space Communications (IWSSC) ER - TY - JOUR T1 - Sixth-Order Statistics-Based Non-Data-Aided SNR Estimation JF - IEEE Communications Letters Y1 - 2007 A1 - R. López-Valcarce A1 - C. Mosquera VL - 11 ER - TY - CONF T1 - Blind carrier phase estimation for non-equiprobable constellations T2 - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Y1 - 2006 A1 - R. López-Valcarce A1 - C. Mosquera KW - Digital Communications KW - phase estimation KW - signal shaping KW - synchronization KW - Tomlinson-Harashima precoding JF - IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) CY - Cannes, France ER - TY - CONF T1 - High-rate quantization data hiding robust to arbitrary linear filtering attacks T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2006 A1 - Fernando Pérez-González A1 - C. Mosquera A1 - Marcos Álvarez-Díaz A1 - Reginald Lagendijk ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA VL - 5306 ER - TY - JOUR T1 - Improving the performance of RDM watermarking by means of trellis coded quantisation JF - IEE Proceedings on Information Security Y1 - 2006 A1 - Andrea Abrardo A1 - Mauro Barni A1 - Fernando Pérez-González A1 - C. Mosquera KW - data-hiding KW - watermarking VL - 153 ER - TY - CONF T1 - Symbol-Rate Estimation for DVB-S2 Broadcasting T2 - International Workshop on Signal Processing for Space Communications (SPSC) Y1 - 2006 A1 - C. Mosquera A1 - Sandro Scalise A1 - R. López-Valcarce KW - DVB KW - symbol rate KW - synchronization JF - International Workshop on Signal Processing for Space Communications (SPSC) ER - TY - CONF T1 - Trellis Shaping Techniques for Satellite Telecommunication Systems T2 - International Workshop on Satellite and Space Communications (IWSSC) Y1 - 2006 A1 - Marcos Álvarez-Díaz A1 - Neri, Massimo A1 - C. Mosquera A1 - Giovanni Emanuele Corazza KW - Digital Communications KW - precoding KW - satellite communications JF - International Workshop on Satellite and Space Communications (IWSSC) CY - Leganés, Spain ER - TY - CONF T1 - Ensuring Gain Invariance in High-Rate Data-Hiding T2 - Security, Steganography, and Watermarking of Multimedia Contents Y1 - 2005 A1 - Fernando Pérez-González A1 - C. Mosquera A1 - Mauro Barni A1 - Andrea Abrardo ED - Edward J. Delp ED - Ping W. Wong KW - data-hiding KW - watermarking JF - Security, Steganography, and Watermarking of Multimedia Contents T3 - Proc. of SPIE PB - SPIE CY - San Jose, California, USA VL - 5306 ER - TY - JOUR T1 - Rational Dither Modulation: a high-rate data-hiding method robust to gain attacks JF - IEEE Transactions on Signal Processing Y1 - 2005 A1 - Fernando Pérez-González A1 - C. Mosquera A1 - Mauro Barni A1 - Andrea Abrardo KW - data-hiding KW - watermarking VL - 53 N1 - Third supplement on secure media ER - TY - CONF T1 - Bias analysis and removal of a microphone array based road traffic speed estimator T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2004 A1 - R. López-Valcarce A1 - D. Hurtado A1 - C. Mosquera A1 - Fernando Pérez-González KW - microphone arrays KW - speed estimation KW - traffic monitoring JF - European Signal Processing Conference (EUSIPCO) CY - Vienna, Austria ER - TY - JOUR T1 - Estimation of road vehicle speed using two omnidirectional microphones: a maximum likelihood approach JF - EURASIP Journal of Applied Signal Processing Y1 - 2004 A1 - R. López-Valcarce A1 - C. Mosquera A1 - Fernando Pérez-González KW - microphone arrays KW - speed estimation KW - traffic monitoring VL - 2004 ER - TY - CONF T1 - POLI-MAS: Power-Line Multichannel Audio System T2 - International Symposium on Power Line Communications and Its Applications (ISPLC) Y1 - 2004 A1 - Fernando J. Mato-Méndez A1 - C. Mosquera KW - audio KW - multichannel KW - PLC JF - International Symposium on Power Line Communications and Its Applications (ISPLC) ER - TY - CONF T1 - Rational Dither Modulation: a novel data-hiding method robust to value-metric attacks T2 - IEEE International Workshop on Multimedia Signal Processing Y1 - 2004 A1 - Fernando Pérez-González A1 - Mauro Barni A1 - Andrea Abrardo A1 - C. Mosquera KW - data-hiding KW - watermarking JF - IEEE International Workshop on Multimedia Signal Processing CY - Siena, Italy ER - TY - CONF T1 - Feedback Timing Synchronization for IF-Sampled Systems T2 - International Workshop on Signal Processing for Space Communications (SPSC) Y1 - 2003 A1 - C. Mosquera A1 - M. Cacheda KW - PLC JF - International Workshop on Signal Processing for Space Communications (SPSC) ER - TY - CONF T1 - Indoor Image Acquisition and Distribution System T2 - International Symposium on Power Line Communications and Its Applications (ISPLC) Y1 - 2003 A1 - D. Fondo A1 - M. Cacheda A1 - C. Mosquera KW - PLC JF - International Symposium on Power Line Communications and Its Applications (ISPLC) ER - TY - CONF T1 - A low complexity all-digital DS-SS transceiver for power-line communications T2 - International Symposium on Power Line Communications and Its Applications (ISPLC) Y1 - 2003 A1 - M. Ferreiro A1 - M. Cacheda A1 - C. Mosquera KW - DS-SS KW - modem KW - PLC JF - International Symposium on Power Line Communications and Its Applications (ISPLC) ER - TY - CONF T1 - Road vehicle speed estimation from a two-microphone array T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2002 A1 - Fernando Pérez-González A1 - R. López-Valcarce A1 - C. Mosquera KW - microphone arrays KW - speed estimation KW - traffic monitoring JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Orlando, FL, USA VL - 2 ER - TY - CONF T1 - Spectral characterization of feedback linear periodically time-varying systems T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 2002 A1 - C. Mosquera A1 - Sandro Scalise A1 - G. Taricco KW - burst KW - inversion KW - LPTV KW - PLL JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) ER - TY - JOUR T1 - Adaptive IIR Filters for Active Noise Control JF - International Journal of Acoustics and Vibration Y1 - 2001 A1 - C. Mosquera A1 - J.A. Gómez A1 - Fernando Pérez-González A1 - M. Sobreira A1 - E. Alexandre KW - ANC KW - IIR KW - SPR VL - 6 ER - TY - JOUR T1 - Algebraic solution to the robust SPR problem for two polynomials JF - Automatica Y1 - 2001 A1 - C. Mosquera A1 - Fernando Pérez-González KW - robust KW - SPR VL - 37 ER - TY - CONF T1 - A Channel Model for the Galician Low Voltage Main Network T2 - International Symposium on Power Line Communications and Its Applications (ISPLC) Y1 - 2001 A1 - Nuria González-Prelcic A1 - C. Mosquera A1 - Norberto Degara-Quintela A1 - A. Currais JF - International Symposium on Power Line Communications and Its Applications (ISPLC) CY - Malmo, Sweden ER - TY - JOUR T1 - On the strengthened robust SPR problem for discrete-time systems JF - Automatica Y1 - 2001 A1 - C. Mosquera A1 - Fernando Pérez-González KW - robust KW - SPR KW - strengthened VL - 37 ER - TY - CONF T1 - Time-transfer performance in burst-mode communication systems T2 - International Workshop on Digital Signal Processing Techniques for Space Communications (DSP) Y1 - 2001 A1 - C. Mosquera A1 - Sandro Scalise A1 - G. Taricco A1 - D. Giunta KW - burst KW - PLL KW - synchronization JF - International Workshop on Digital Signal Processing Techniques for Space Communications (DSP) ER - TY - JOUR T1 - Time-transfer performance in burst-mode communication systems JF - IEEE Journal on Selected Areas in Communications Y1 - 2001 A1 - C. Mosquera A1 - Sandro Scalise A1 - G. Taricco A1 - G. Garofalo A1 - D. Giunta KW - burst KW - PLL KW - synchronization VL - 19 ER - TY - JOUR T1 - Convergence analysis of the multiple-channel filtered-U recursive LMS algorithm for active noise control JF - Signal Processing Y1 - 2000 A1 - C. Mosquera A1 - Fernando Pérez-González KW - ANC KW - FuRLMS KW - SPR VL - 80 ER - TY - JOUR T1 - Hyperstable adaptive IIR algorithms with polyphase structures: analysis and design JF - IEEE Transactions on Signal Processing Y1 - 1999 A1 - R. López-Valcarce A1 - C. Mosquera A1 - Fernando Pérez-González KW - adaptive IIR filters KW - system identification VL - 47 ER - TY - CONF T1 - Hyperstable polyphase adaptive IIR filters T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 1999 A1 - C. Mosquera A1 - Fernando Pérez-González A1 - R. López-Valcarce KW - adaptive IIR filters KW - system identification JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) CY - Phoenix, AZ, USA VL - 4 ER - TY - CONF T1 - IIR adaptive filters for active noise control T2 - International Congress on Sound and Vibration Y1 - 1999 A1 - C. Mosquera A1 - J.A. Gómez A1 - Fernando Pérez-González A1 - M. Sobreira KW - ANC KW - IIR KW - SPR JF - International Congress on Sound and Vibration CY - Copenhagen, Denmark ER - TY - JOUR T1 - The robust SPR problem: design algorithms and new applications JF - Signal Processing Y1 - 1999 A1 - C. Mosquera A1 - L. Leyra A1 - Fernando Pérez-González KW - robust KW - SPR VL - 76 ER - TY - CONF T1 - An approach to the robust SPR problem through interpolation and avoidance: connections with the robust stability problem T2 - American Control Conference Y1 - 1998 A1 - C. Mosquera A1 - Fernando Pérez-González KW - avoidance KW - interpolation KW - robust KW - SPR JF - American Control Conference ER - TY - JOUR T1 - On the bias of the modified output error algorithm JF - IEEE Transactions on Automatic Control Y1 - 1998 A1 - C. Mosquera A1 - R. López-Valcarce A1 - Fernando Pérez-González KW - adaptive IIR filters KW - system identification VL - 43 ER - TY - CONF T1 - Filtered error adaptive IIR algorithms and their application to active noise control T2 - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Y1 - 1998 A1 - C. Mosquera A1 - J.A. Gómez A1 - Fernando Pérez-González KW - adaptive KW - IIR KW - SPR JF - IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) ER - TY - THES T1 - Relaxation of the SPR condition with applications to the convergence of adaptive recursive algorithms Y1 - 1998 A1 - C. Mosquera PB - University of Vigo, Spain ER - TY - CHAP T1 - The Simultaneous Strict Positive Real Problem: Similarities with the Simultaneous Stability Problem and Applications in Adaptive Recursive Algorithms T2 - Mathematics in Signal Processing Y1 - 1998 A1 - C. Mosquera A1 - Fernando Pérez-González ED - J.G. McWhirter ED - I.K. Proudler KW - robust KW - SPR JF - Mathematics in Signal Processing PB - Oxford University Press ER - TY - CONF T1 - On the strengthened robust SPR problem for discrete-time systems T2 - American Control Conference Y1 - 1998 A1 - C. Mosquera A1 - Fernando Pérez-González JF - American Control Conference ER - TY - JOUR T1 - An Algorithm for Interpolation with Positive Rational Functions on the Imaginary Axis JF - Automatica Y1 - 1997 A1 - C. Mosquera A1 - Fernando Pérez-González KW - interpolation KW - SPR VL - 33 ER - TY - CHAP T1 - Analysis and Synthesis Tools for Robust SPRness T2 - Intelligent methods in signal processing and communications Y1 - 1997 A1 - C. Mosquera A1 - Juan R. Hernández A1 - Fernando Pérez-González ED - A. Figueiras ED - D. Docampo ED - Fernando Pérez-González KW - robust KW - SPR JF - Intelligent methods in signal processing and communications PB - Birkhauser ER - TY - CONF T1 - Characterization and Algebraic Solution to the Extreme-Point Robust SPR Problem T2 - IFAC World Congress Y1 - 1996 A1 - Fernando Pérez-González A1 - C. Mosquera KW - robust KW - SPR JF - IFAC World Congress CY - San Francisco, CA, USA ER - TY - CONF T1 - Algebraic LTI Filter Synthesis for Simultaneously Making a Convex Combination of Discrete-Time Plants SPR T2 - IEEE Conference on Decision and Control (CDC) Y1 - 1995 A1 - Fernando Pérez-González A1 - C. Mosquera KW - robust KW - SPR JF - IEEE Conference on Decision and Control (CDC) CY - New Orleans, LA ER -