Now showing items 21-40 of 70

    • Downlink multi-user massive MIMO transmission using receive spatial modulation 

      Raafat Hosny Mohamed Fahm, Ahmed; Agustín de Dios, Adrián; Vidal Manzano, José (Institute of Electrical and Electronics Engineers (IEEE), 2020-10-01)
      Article
      Open Access
      In this paper, we consider the downlink of a multi-user multiple-input-multiple-output system operating at the millimeter wave band in an outdoor environment. In this band, receive spatial modulation (RSM) schemes have ...
    • 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 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 ...
    • Energy efficient transmit-receive hybrid spatial modulation for large-scale MIMO systems 

      Raafat Hosny Mohamed Fahm, Ahmed; Sefunç, Merve; Agustín de Dios, Adrián; Vidal Manzano, José; Jorswieck, Eduard Axel; Corre, Yoann (2020-03-01)
      Article
      Open Access
      We consider a point to point large-scale multipleinput multiple-output (MIMO) system operating in the millimeter wave (mmWave) band and an outdoor scenario. Novel transmit and receive spatial modulation (SM) schemes are ...
    • Energy efficient transmit-receive spatial modulation for uplink-downlink large-scale MIMO systems 

      Raafat Hosny Mohamed Fahm, Ahmed; Yüzgeçcioglu, Merve; Zahid Aslam, Mohammed; Agustín de Dios, Adrián; Vidal Manzano, José; Jorswieck, Eduard Axel; Corre, Yoann (2019-02-21)
      Conference report
      Open Access
      Energy efficient spatial modulation-aided uplink and downlink designs for future millimeterwave (mmWave) large-scale multiple-input multiple-output (MIMO) systems are considered. Two novel uplink transceivers are proposed ...
    • Enhanced MDIR receiver for space-time dispersive channels 

      Vidal Manzano, José; Cabrera-Bean, Margarita; Agustín de Dios, Adrián; Lagunas Hernandez, Miguel A. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003-01-31)
      Article
      Open Access
      A particular property of the matched desired impulse response receiver is introduced in this paper, namely, the fact that full exploitation of the diversity is obtained with multiple beamformers when the channel is ...
    • FREEDOM - D42 Design and evaluation of effective procedures for MAC layer 

      Mach, P.; Becvar, Z.; Bestak, R.; Neruda, M.; Roux, P.; Hariyanto, H.; Ari Wibowo, F.X.; Agustín de Dios, Adrián; Muñoz Medina, Olga; Vidal Manzano, José; Carfagna, A. (2012-01)
      Research report
      Open Access
      The implementation of femtocells introduces many technical challenges that must be solved in order to fully exploit their potentials. This deliverable primarily focuses on control procedures for radio resource management ...
    • FREEDOM D3.2 Interference Coordination Protocols in Femto-based Networks 

      Agustín de Dios, Adrián; Muñoz Medina, Olga; Vidal Manzano, José; Goldhammer, Mariana; Rodríguez Fonollosa, Javier; Pastore, Adriano; Sardellitti, Stefania; Pescosolido, Loreto; di Lorenzo, Paolo; Barbarossa, Sergio; Baiocchi, Andrea; de Marinis, Enrico; Imponente, Giovanni; Pucci, Fabrizio; Rosi, Guido (2011-11-28)
      Research report
      Open Access
      This document looks into coordinated radio resource allocation algorithms in deployments of huge number of femto-access points (FAP) by exploiting the message exchange at control-plane level through the wired ISP backhaul ...
    • FREEDOM D3.3 - Cooperative schemes in the femto-based networks 

      Agustín de Dios, Adrián; Vidal Manzano, José; Pescosolido, L.; Barbarossa, S.; Kammoun, M.; Sarkiss, M. (2012-01)
      Research report
      Open Access
      We investigate cooperative transmission schemes that can be applied to joint deployments of femto-access points (FAPs) and macro base stations (MBS) by exploiting backhaul communication links between nodes at the data-plane ...
    • FREEDOM D4.2 Design and evaluation of effective procedures for MAC layer 

      Mach, Pavel; Becvar, Zdenek; Bestak, Robert; Neruda, M.; Roux, Pierre; Hariyanto, Hari; Ari Wibowo, Franciscus X.; Agustín de Dios, Adrián; Muñoz Medina, Olga; Vidal Manzano, José; Carfagna, Alessandro (2012-01-16)
      Research report
      Open Access
      The implementation of femtocells introduces many technical challenges that must be solved in order to fully exploit their potentials. This deliverable primarily focuses on control procedures for radio resource management ...
    • FREEDOM Project. Interference coordination protocols in femto-based networks 

      Rosi, Guido; Pucci, Fabrizio; Imponente, Giovanni; de Marinis, Enrico; Baiocchi, Andrea; Barbarossa, Sergio; di Lorenzo, Paolo; Agustín de Dios, Adrián; Muñoz Medina, Olga; Vidal Manzano, José; Goldhamer, M.; Rodríguez Fonollosa, Javier; Pastore, A.; Sardellitti, Stefania; Pescosolido, Loreto (2011-11-28)
      Research report
      Open Access
      This document looks into coordinated radio resource allocation algorithms in deployments of huge number of femto-access points (FAP) by exploiting the message exchange at control-plane level through the wired ISP backhaul ...
    • FREEDOM Project. Scenario, requirements and first business model analysis 

      Imponente, Giovanni; Vivier, G.; Agustín de Dios, Adrián; Vidal Manzano, José; Muñoz Medina, Olga; Barbarossa, Sergio; Pescosolido, Loreto; Omilipo, M; de Marinis, Enrico; Simamora, L; Widiawan, A.K.; Hariyanto, H; Corre, Y; Mach, P; Becvar, Z; Kamoun, M; Roux, P; Lopatka, M (2010-06-20)
      Research report
      Open Access
      This deliverable is the first of FREEDOM project. It provides an outlook of the scenarios and assumptions widely shared in the wireless community when addressing femtocell deployment. It starts by providing scenarios as ...
    • Hierarchical beamforming in random access channels 

      Agustín de Dios, Adrián; Cabrera-Bean, Margarita; Vidal Manzano, José (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Conference lecture
      Open Access
      Managing a massive number of terminals in a contention-based multiple access is challenging due to its intrinsic limited efficiency. For example, in the random access channel considered in LTE-A and 5G NR, Base Station ...
    • Hybrid turbo FEC/ARQ systems and distributed space-time coding for cooperative transmission 

      Agustín de Dios, Adrián; Vidal Manzano, José; Muñoz Medina, Olga (2005-08-24)
      Article
      Open Access
      Cooperative transmission can be seen as a "virtual" MIMO system, where the multiple transmit antennas are in fact implemented distributed by the antennas both at the source and the relay terminal. Depending on the system ...
    • Improper Gaussian signaling for the Z-interference channel 

      Lagén Morancho, Sandra; Agustín de Dios, Adrián; Vidal Manzano, José (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      The optimal transmission scheme for a multiple-input multiple-output point-to-point channel (MIMO-P2P) is dependent on the type of received interference, which can be either proper or improper. We will show that the presence ...
    • Improved interference alignment precoding for the MIMO X channel 

      Agustín de Dios, Adrián; Vidal Manzano, José (2011)
      Conference report
      Restricted access - publisher's policy
      We derive a linear transmit precoding scheme based on interference alignment at the transmitters and zero-forcing at the receivers, for the MIMO X channel based on the Generalized Singular Value Decomposition (GSVD) that ...
    • Innovative mmWave transmissions schemes channel models and antennas 

      Agustín de Dios, Adrián; Vidal Manzano, José; Pascual Iserte, Antonio; Raafat Hosny Mohamed Fahm, Ahmed; Aslam, Zahid; Corre, Yoann; Basavarajappa, Vedaprabhu; Bedia, Beatriz; Tan, Yi; Wang, Cheng-Xiang (2017-10-12)
      Research report
      Open Access
      The next generation (5G) of wireless communication will improve upon existing mobile communication standards significantly while taking into account the increasing amount of stress on the limited amount of available ...
    • Joint user scheduling and transmit direction selection in 5G TDD dense small cell networks 

      Lagén Morancho, Sandra; Agustín de Dios, Adrián; Vidal Manzano, José (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Conference report
      Restricted access - publisher's policy
      This paper proposes a joint user scheduling and transmit direction selection procedure for dynamic TDD in 5G dense small cell networks, where the transmit direction (i.e. downlink (DL) or uplink (UL)) selected per small ...
    • Joint user scheduling, precoder design, and transmit direction selection in MIMO TDD small cell networks 

      Lagén Morancho, Sandra; Agustín de Dios, Adrián; Vidal Manzano, José (2017-04-01)
      Article
      Open Access
      New short-length single-direction frame structures are proposed for 5G time division duplex (TDD) systems, where the transmit direction [i.e., either downlink (DL) or uplink (UL)] can be independently chosen at each cell ...
    • Linear transceiver design in nonregenerative relays with channel state information 

      Muñoz Medina, Olga; Vidal Manzano, José; Agustín de Dios, Adrián (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-06)
      Article
      Open Access
      This paper deals with the design of nonregenerative relaying transceivers in cooperative systems where channel state information (CSI) is available at the relay station. The conventional nonregenerative approach is the ...