Exploració per autor "Pérez Neira, Ana Isabel"
Ara es mostren els items 76-95 de 252
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Distributed power control with received power constraints for time-area-spectrum licenses
(2016-03)
Article
Accés obertThis paper deals with the problem of optimal decentralized power control in systems whose spectrum is regulated in time and space, the so-called time-area-spectrum (TAS) licensed. This license system gives to the owner the ... -
Dual polarized modulation and reception for next generation mobile satellite communications
(2015-10-01)
Article
Accés obertThis paper presents the novel application of polarized modulation (PMod) for increasing the throughput in mobile satellite transmissions. One of the major drawbacks in mobile satellite communications is the fact that the ... -
DVB-T candidate power detector for cognitive radio
(2009)
Text en actes de congrés
Accés obertDynamic detection of primary users is one of the main functions of spectrum sensing for Cognitive Radio (CR) communications aiming to increase the use of radio spectrum. In this work the performance of the so-called ... -
Dynamic bit allocation and differential quantization in feedback link for robust power allocation in multiuser opportunistic beamforming
(2008)
Text en actes de congrés
Accés obertMulti-antenna systems provide advantages in terms of link quality and multiuser access capabilities, which can be achieved by using schemes as multibeam opportunistic beamforming. This scheme only requires partial channel ... -
Edge computing and communication for energy-efficient earth surveillance with LEO satellites
(Institute of Electrical and Electronics Engineers (IEEE), 2022)
Comunicació de congrés
Accés obertModern satellites deployed in low Earth orbit (LEO) accommodate processing payloads that can be exploited for edge computing. Furthermore, by implementing inter-satellite links, the LEO satellites in a constellation can ... -
Efficient margin adaptive scheduling for MIMO-OFDMA systems
(2013-01)
Article
Accés restringit per política de l'editorialIn this paper we address the problem of margin adaptive scheduling in the downlink of an orthogonal frequency division multiple access (OFDMA) multiple-input multiple-output (MIMO) system. Optimal resource allocation in ... -
Energy efficiency communications over the AWGN relay channel
(2010)
Article
Accés restringit per política de l'editorialThis paper addresses the energy efficiency analysis of the relay channel under additive white Gaussian noise. We consider the rate bounds given by decode and forward and the cut set bound and assume that resources are ... -
Energy efficient communications over the AWGN relay channel
(2010-01-08)
Article
Accés obertThis paper addresses the energy efficiency analysis of the relay channel under additive white Gaussian noise. We consider the rate bounds given by decode and forward and the cut set bound and assume that resources are ... -
Enhancing cell-free massive MIMO networks through LEO satellite integration
(Institute of Electrical and Electronics Engineers (IEEE), 2021)
Text en actes de congrés
Accés obertThis paper proposes a hybrid network architecture combining a cell-free Massive MIMO terrestrial layout with a low Earth orbit satellite segment jointly targeting the maximization of the minimum per-user rate in the coverage ... -
ENN: a neural network with DCT adaptive activation functions
(Institute of Electrical and Electronics Engineers (IEEE), 2024-02-01)
Article
Accés obertThe expressiveness of neural networks highly depends on the nature of the activation function, although these are usually assumed predefined and fixed during the training stage. Under a signal processing perspective, in ... -
Error rate analysis and optimal power allocation in multiple access relay channels with analog network coding
(Institute of Electrical and Electronics Engineers (IEEE), 2014)
Text en actes de congrés
Accés restringit per política de l'editorialIn this paper, we examine multi-source multi-relay systems that employ Analog Network Coding for which we provide a two-fold contribution: i) We derive a closed-form upper bound of the average symbol error rate (SER) ... -
Estimación recursiva simultánea de potencia y DOA por ajuste de la matriz de covarianza asociada a la apertura
(1992)
Text en actes de congrés
Accés obertThe small error approximation is used to derive a linear relationship between the source parameters (i.e. power levels and directions of arrival or DOA's) and a measurement of the covariance error matrix, defined as the ... -
Evaluation of spectrum opportunities in the GSM band
(2009)
Text en actes de congrés
Accés obertIn this paper we explore the possibility of exploiting underutilized channels in the GSM bands. The secondary (unlicensed) users of the spectrum are the nodes of an overlay cognitive ad-hoc network, which opportunistically ... -
Evolution of spatial and multicarrier scheduling: towards multi-cell scenario
(2010)
Text en actes de congrés
Accés obertOFDMA systems are considered as the promising multiple access scheme of next generation multi-cellular wireless systems. In order to ensure the optimum usage of radio resources, OFDMA radio resource management algorithms ... -
Examen Final
(Universitat Politècnica de Catalunya, 2019-01-08)
Examen
Accés restringit a la comunitat UPC -
Examen Final
(Universitat Politècnica de Catalunya, 2021-06-17)
Examen
Accés restringit a la comunitat UPC -
Examen Final
(Universitat Politècnica de Catalunya, 2014-06-06)
Examen
Accés restringit a la comunitat UPC -
Examen Final
(Universitat Politècnica de Catalunya, 2020-06-16)
Examen
Accés restringit a la comunitat UPC -
Experimental performance bounds of MIMO-FBMC/OQAM systems
(2010)
Text en actes de congrés
Accés restringit per política de l'editorialThis paper addresses the application of filter bank multicarrier (FBMC) systems to multiple-input-multiple-output (MIMO) channels. In particular, it is investigated the FBMC modulation based on OQAM, known as FBMC/OQAM. ... -
Experimental performance evaluation of a MAC protocol for cooperative ARQ scenarios
(2009)
Text en actes de congrés
Accés obertThis paper provides details and performance evaluation of the implementation of the Persistent Relay Carrier Sensing Multiple Access (PRCSMA) protocol for Cooperative ARQ (C-ARQ) scenarios using off-the-shelf wireless ...
