• Closed form expressions for maximum delay and jitter in multibeam opportunistic beamforming 

    Zorba, Nizar; Pérez Neira, Ana Isabel (2007)
    Text en actes de congrés
    Accés obert
    Scheduling in a broadcast (BC) channel based on partial channel state information at the transmitter (CSIT) is carried out through a multibeam opportunistic beamforming technique. Within a more practical perspective, this ...
  • Cooperative communications: from theory to experimental implementation 

    Alonso-Zárate, Jesús; Sanchez Recacha, Javier; Zorba, Nizar; Pérez Neira, Ana Isabel; Verikoukis, Christos (2012)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Over the last years, cooperative communications have been studied from both fundamental and practical points of view. However, most of the existing studies of cooperative communications rely on math or computer simulation. ...
  • Dynamic bit allocation and differential quantization in feedback link for robust power allocation in multiuser opportunistic beamforming 

    Zorba, Nizar; Pascual Iserte, Antonio; Pérez Neira, Ana Isabel (2008)
    Text en actes de congrés
    Accés obert
    Multi-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 ...
  • Multiuser MAC schemes for high-throughput IEEE 802.11n/ac WLANs 

    Kartsakli, Elli; Zorba, Nizar; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (InTech, 2013-12)
    Capítol de llibre
    Accés obert
    In the last decade, the Wireless Local Area Network (WLAN) market has been experiencing an impressive growth that began with the broad acceptance of the IEEE 802.11 standard [1]. Given the widespread deployment of WLANs ...
  • QoS scheduling in heterogeneous traffic multiuser multiantenna WLAN systems 

    Zorba, Nizar; Verikoukis, Christos; Pérez Neira, Ana Isabel (2009)
    Text en actes de congrés
    Accés obert
    A cross-layer based dynamically tuned queue length scheduler is presented in this paper, for the Downlink of multiuser and multiantenna WLAN systems with heterogeneous traffic requirements. An opportunistic scheduling ...
  • The performance of HSDPA-HDR in delay constrained applications: closed-form expressions 

    Zorba, Nizar; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (2007)
    Text en actes de congrés
    Accés obert
    Scheduling in a Downlink channel based on partial Channel State Information at the Transmitter (CSIT) is carried out through an opportunistic technique. Within a more practical perspective, this paper first presents a ...