Exploració per tema "Beamforming"

Ara es mostren els items 1-20 de 47

    • 5G network planning and optimisation using Atoll 

      Rios, Riviel (Universitat Politècnica de Catalunya, 2019-07)
      Projecte Final de Màster Oficial
      Accés obert
      This thesis consists on the study of some 5G NR key features such as massive MIMO and beamforming and how they are modelled by Atoll, a network design and planning software. For this, a single cell was deployed on a sample ...

    • 5G NR small cells deployment using Beamforming 

      Vinyes Marco, Nuria (Universitat Politècnica de Catalunya, 2022-05-24)
      Projecte Final de Màster Oficial
      Accés obert
      Realitzat a/amb:   Forsk
      5G mobile communication systems should bring significant benefits such as lower latency, higher peak and user data rates, connection density and availability. To achieve such benefits beamforming at the base stations and ...

    • A 3–5-GHz, 385–540-ps CMOS true time delay element for ultra-wideband antenna arrays 

      Aghazadeh Dafsari, Seyed Rasoul; Martínez García, Herminio; Barajas Ojeda, Enrique; Saberkari, Alireza (Elsevier, 2022-05-01)
      Article
      Accés restringit per política de l'editorial
      This paper proposes an all-pass filter-based true time delay (TTD) element covering a 3–5-GHz ultra-wideband (UWB) frequency. The proposed TTD element designed in a standard 0.18-µm CMOS technology achieves a tunable delay ...

    • A Cubesat-ready phase synchronization digital payload for coherent distributed remote sensing missions 

      Querol Borràs, Jorge; Merlano-Duncan, Juan Carlos; Martínez Marrero, Liz; Krivochiza, Jevgenij; Kumar, Sumit; Maturo, Nicola; Camps Carmona, Adriano José; Chatzinotas, Symeon; Ottersten, Björn (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Text en actes de congrés
      Accés obert
      Distributed antenna arrays, fractionated payloads and cooperative platforms can provide unprecedented performance in the next generation of spaceborne communications and remote sensing systems. Remote phase synchronization ...

    • A linear array design based on non-uniform Chebyshev distribution for high gain low sidelobe level millimetre wave 5G applications 

      Ahmad, Shaheen (Universitat Politècnica de Catalunya, 2020-07)
      Projecte Final de Màster Oficial
      Accés obert
      Antenna is the front-end element and is a major part of designing a robust communication system. The increased user density and high data rate requirements now a days can be overcome by a wideband antennas capable of having ...

    • A novel approach to MISO interference networks under maximum receive-power regulation 

      Pérez Neira, Ana Isabel; Vázquez Oliver, Miguel Ángel; Lagunas Hernandez, Miguel A. (WSEAS Press, 2018-07-01)
      Article
      Accés obert
      An aggressive frequency reuse is expected within the next years in order to increase the spectral ef¿ciency. Multiuser interference by all in-band transmitters can create a communication bottleneck and, therefore, it is ...

    • Adaptive beamwidth optimization under Doppler ICI and positioning errors at mmWave bands 

      Ballesteros Sánchez, Christian; Pfadler, Andreas; Montero Bayo, Luca; Romeu, Jordi; Jofre Roca, Lluís (Elsevier, 2022-04-01)
      Article
      Accés obert
      The growing trends towards massive antenna arrays with focusing capabilities has enabled the use of higher frequencies at the cost of more complex systems. In the particular case of vehicular communications, millimeter-wave ...

    • Analysis of Multi-User Uplink Channel with MIMO 

      Pujolar I Bastian, Helena (Universitat Politècnica de Catalunya, 2023-04-11)
      Projecte Final de Màster Oficial
      Accés obert
      Realitzat a/amb:   Rheinisch-Westfälische Technische Hochschule Aachen
      The increasing number of connected users as well as the availability of new services and mobile applications drive the need for higher data rates. In order to fulfill such expectations different strategies such as spatial ...

    • Applying frequency scanning arrays for time-efficient analog beam probing in multi-user hybrid beamforming systems 

      Gómez Martínez, Eloi (Universitat Politècnica de Catalunya, 2022-09-05)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   Technische Universität Dresden
      Next generation of mobile communications will have to cover the unceasingly growing demand of higher data rates and reliable services. In this situation it will be a must to migrate towards higher frequencies in the range ...

    • Beam management for vehicle-to-vehicle (V2V) communications in millimeter wave 5G 

      Montero Bayo, Luca; Ballesteros Sánchez, Christian; De Marco, Cesar; Jofre Roca, Lluís (2022-04)
      Article
      Accés obert
      Cooperative, Connected and Automated Mobility (CCAM) is expected to leverage the full potential of wireless communications. With the growing adoption of 5G and its support for Vehicle-to-Everything (V2X) communications, ...

    • Beamformer characterization of the MIR instrument: the microwave interferometric reflectometer 

      Onrubia Ibáñez, Raúl; Pascual Biosca, Daniel; Querol Borràs, Jorge; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Global Navigation Satellite Systems - Reflectometry (GNSS-R) has opened promising results for remote sensing applications. The broadcast of new signals with wider bandwidth provides an opportunity to increase the performance ...

    • 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 ...

    • Distributed inter-cluster interference management for CoMP-based cellular networks 

      Lagén Morancho, Sandra; Agustín de Dios, Adrián; Vidal Manzano, José (2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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 ...

    • 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 ...

    • Efficient cognitive radio networks with cooperative beamforming 

      Ling, Cen; Ruiz Boqué, Sílvia; Yin, Xuefeng; García Lozano, Mario (2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Cooperative communication with spectrum sharing has been proved to be an efficient way to reduce energy consumption. In this work an optimal power allocation algorithm is proposed for mobile cooeprative beamforming networks, ...

    • Energy efficient 5G networks 

      Molluru, Saikrishna Karthik (Universitat Politècnica de Catalunya, 2014-06-13)
      Projecte/Treball Final de Carrera
      Accés obert
      For a greener tomorrow, an important step today will be the energy efficient designs in any aspect. The 5G networks which is most awaited by all, though proposes better data rates, but also speaks about the energy efficiency ...

    • Fuzzy inference based robust beamforming 

      Morell Pérez, Antoni; Pascual Iserte, Antonio; Pérez Neira, Ana Isabel (2005-10)
      Article
      Accés restringit per política de l'editorial
      This paper presents a new approach to robust beamforming based on fuzzy logic theory that is suitable for both point and scattered sources. The presented technique is based on the optimum beamformer and makes it robust to ...

    • Geolocalizing SMOS RFI sources on the densely populated East Asia 

      Hyuk, Park; Camps Carmona, Adriano José; Gonzalez Gambau, Verónica (2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In the SMOS measurements, the negative effect of RadioFrequency Interference (RFI) is clearly present, deteriorating the Brightness Temperature (BT) images. RFI sources have to be monitored and accurately geolocated in ...

    • High angular resolution RFI localization in synthetic aperture interferometric radiometers using direction-of-arrival estimation 

      Hyuk, Park; González Gambau, Veronica; Camps Carmona, Adriano José (2015-01-01)
      Article
      Accés obert
      Radio-frequency interference (RFI) seriously affects the retrieval of geophysical parameters from the measurements of microwave radiometers. An accurate geolocation of the RFI is crucial to effectively switch off illegal ...

    • Hybrid analog-digital transmit beamforming for spectrum sharing satellite-terrestrial systems 

      Vazquez, Miguel Angel; Blanco, Luis; Artiga Campos, Xavier; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper deals with the problem of hybrid analog-digital transmit beamforming under spectrum sharing constraints. Hybrid multiantenna architectures are ideal for high throughput wireless links, where full-digital solutions ...