Now showing items 21-40 of 119

  • Data hidding in color images using perceptual models 

    Vidal Manzano, José; Sayrol Clols, Elisa; Madueño Ruíz, María Isabel (Christian Germain, Eric Grivel, Olivier Lavialle, 2000)
    Conference report
    Open Access
    One of the problems arising from the use of digital media is the ease of identical copies of digital images or audio files, allowing manipulation and unauthorized use. Copyright is an effective tool for preserving ...
  • Decentralized beamforming with coordinated sounding for inter-cell interference management 

    Lagén Morancho, Sandra; Agustín de Dios, Adrián; Vidal Manzano, José (VDE Conference Publications, 2014)
    Conference report
    Restricted access - publisher's policy
    This paper presents and evaluates a decentralized beamforming design for inter-cell interference management that is highly recommended in Time Division Duplex (TDD) cellular network deployments and interference limited ...
  • Decentralized coordinated precoding for dense TDD small cell networks 

    Lagén Morancho, Sandra; Agustín de Dios, Adrián; Vidal Manzano, José (2015-08-01)
    Article
    Open Access
    Cellular networks need the densification of small eNBs (SeNBs) to face the tremendous data traffic demand growth, implying an interference increase and making transmit coordination a key enabler. This article proposes a ...
  • Decentralized weighted sum rate maximization in MIMO-OFDMA femtocell networks 

    Agustín de Dios, Adrián; Vidal Manzano, José; Muñoz Medina, Olga; Rodríguez Fonollosa, Javier (2012)
    Conference report
    Restricted access - publisher's policy
    We propose a decentralized strategy for downlink interference management in overlaid MIMO femtocell-macrocell deployments operating in the same band under OFDMA access. The resource allocation, consisting of MIMO precoders ...
  • Decentralized widely linear precoding design for the MIMO interference channel 

    Lagén Morancho, Sandra; Agustín de Dios, Adrián; Vidal Manzano, José (2014)
    Conference report
    Restricted access - publisher's policy
    his paper addresses the interference management in a MIMO interference channel (MIMO-IC) by proposing a decentralized transmit and receive beamformer optimization using improper (or circularly asymmetric complex) Gaussian ...
  • Degrees of freedom of the rank-deficient MIMO X channel 

    Agustín de Dios, Adrián; Vidal Manzano, José (2013)
    Conference report
    Restricted access - publisher's policy
    The multiple-input multiple-output (MIMO) X channel with rank-deficient channels is considered. We characterize the total degrees of freedom (DoF) by defining an outer bound which is attained by the proposed precoding ...
  • Delay minimization in dynamic and scalable multi-operator wireless backhauling 

    Surís, Didac; Agustín de Dios, Adrián; Vidal Manzano, José (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Conference report
    Open Access
    This paper focuses on the optimization of routing and interference-aware resource allocation for a wireless backhaul network, focusing on the end-to-end delay minimization. We adopt a convex optimization formulation, which ...
  • Deliverable D21 (project TUCAN3G). Socio-economic scenarios, technical specifications and architecture for the proof of concept 

    García Rey, Ana; Prieto Egido, Ignacio; Sánchez, Ernesto; Muñoz Medina, Olga; Vidal Manzano, José; Agustín de Dios, Adrián; Pascual Iserte, Antonio; Simó Reigadas, Javier; Paco Fernández, Juan; Castillo Molina, Yury Yohana; Ramírez, Gustavo; Tupayachi Calderón, Omar (2013-05)
    External research report
    Open Access
    TUCAN3G aims to develop solutions to provide 3G services in isolated rural areas of developing countries. In order to do so, this document starts by analysing the reference scenarios where TUCAN3G solutions could be applied, ...
  • Deliverable D22 (project TUCAN3G). Operational technical handbook 

    Prieto Egido, Ignacio; Martínez Fernández, Andrés; Sotelo López, Carlos; Agustín de Dios, Adrián; Vidal Manzano, José; Simó Reigadas, Javier; Paco Fernández, Juan; Rendón, Álvaro (2013-05)
    External research report
    Open Access
    This document shows a detailed plan for the work required to accomplish the objectives of TUCAN3G. All partners have contributed to this document by defining tasks and subtask, in coordination with the technical coordinator ...
  • Dimensioning cellular networks with fixed relay stations 

    Vidal Manzano, José; Marina, Ninoslav; Host-Madsen, Anders (2008)
    Conference report
    Open Access
    We analyze the downlink spectral efficiency of multicellular wireless networks where in each cell in addition to the base station (BS) a certain number of relay stations (RS) are deployed. It is observed that by introducing ...
  • Distributed inter-cluster interference management for CoMP-based cellular networks 

    Lagén Morancho, Sandra; Agustín de Dios, Adrián; Vidal Manzano, José (2013)
    Conference report
    Restricted access - publisher's policy
    This paper proposes distributed inter-cluster interference management procedures for 1 Coordinated Multi-Point (CoMP) Time Division Duplexing (TDD) cellular networks, in which a set of base stations (BSs), that form a ...
  • Distributed user-centric clustering and precoding design for CoMP joint transmission 

    Lagén Morancho, Sandra; Agustín de Dios, Adrián; Vidal Manzano, José; Soret, Beatriz; Pedersen, Klaus (2015)
    Conference report
    Restricted access - publisher's policy
    This paper addresses distributed interference management in downlink of multi-cell multiple- input multiple-output (MIMO) time division duplex (TDD) networks. Each user is associated with a user-centric cluster of base ...
  • Diversity mdir receiver for space-time dispersive channels 

    Vidal Manzano, José; Cabrera-Bean, Margarita; Agustin, Adrian; Lagunas Hernandez, Miguel A. (European Commission, 2000)
    Conference report
    Open Access
    A particular property of the cellebrated MDIR receiver is introduced in this communication, namely, the fact that full exploitation of the diversity is obtained with multiple beamformers when the channel is spatially and ...
  • Downlink coordinated radio resource management in cellular networks with partial CSI 

    Calvo Page, Eduard; Muñoz Medina, Olga; Vidal Manzano, José; Agustín de Dios, Adrián (2012-03)
    Article
    Restricted access - publisher's policy
    We explore decentralized coordination of sectored cellular networks to adapt the usage of downlink resources to the instantaneous network conditions. The transmission frame consists of an orthogonal bandwidth usage ...
  • Downlink multi-cell radio resource management for coordinated base stations 

    Muñoz Medina, Olga; Calvo Page, Eduard; Vidal Manzano, José; Agustín de Dios, Adrián (2010)
    Conference report
    Open Access
  • Duration modeling with expanded HMM applied to speech recognition 

    Bonafonte Cávez, Antonio; Vidal Manzano, José; Nogueiras Rodríguez, Albino (H. TIMOTHY BRUMMELL, WILLIAM IDSARDI CITATION DELAWARE, NEW CASTLE, DELAWARE, 1996)
    Conference lecture
    Open Access
    The occupancy of the HMM states is modeled by means of a Markov chain. A linear estimator is introduced to compute the probabilities of the Markov chain. The distribution function (DF) represents accurately the observed ...
  • Dynamic base station switch on/off strategies for sustainable wireless networks 

    Rubio López, Javier; Pascual Iserte, Antonio; Olmo Alòs, Jaume del; Vidal Manzano, José (2014)
    Conference lecture
    Restricted access - publisher's policy
    In this paper, we present a procedure for switching on and off base stations (BSs) that are powered with solar panels and have finite batteries. In the scenario under consideration it is considered that the BSs are placed ...
  • Efficient use of paired spectrum bands through TDD small cell deployments 

    Agustín de Dios, Adrián; Lagén Morancho, Sandra; Vidal Manzano, José; Muñoz Medina, Olga; Pascual Iserte, Antonio; Zhiheng, Guo; Ronghui, Wen (2017-09)
    Article
    Open Access
    Traditionally, wireless cellular systems have been designed to operate in frequency division duplexing (FDD) paired bands that allocate the same amount of spectrum for both downlink (DL) and uplink (UL) communications. ...
  • Energy efficiency in latency-constrained application offloading from mobile clients to multiple virtual machines 

    Lagén Morancho, Sandra; Pascual Iserte, Antonio; Muñoz Medina, Olga; Vidal Manzano, José (2017-11-28)
    Article
    Open Access
    This paper addresses the energy-latency trade-off in distributed application offloading, in which an energy-limited handset offloads totally or partially an application to one or several virtual machines (VMs) located in ...
  • Energy efficient cell load-aware coverage optimization for small-cell networks 

    Agustín de Dios, Adrián; Lagén Morancho, Sandra; Vidal Manzano, José (2015)
    Conference report
    Restricted access - publisher's policy
    Self-organizing network is a new capability envisioned for the near-future wireless cellular networks. Among the different use cases, here we tackle the coverage optimization with the objective of adjusting the power devoted ...