Exploració per tema "Channel estimation"

Ara es mostren els items 1-16 de 16

    • A framework for joint design of pilot sequence and linear precoder 

      Pastore, Adriano; Joham, Michael; Rodríguez Fonollosa, Javier (2016-09-01)
      Article
      Accés obert
      Most performance measures of pilot-assisted multiple-input multiple-output systems are functions of the linear precoder and the pilot sequence. A framework for the optimization of these two parameters is proposed, based ...

    • Application of hidden markov models to blind channel estimation and data detection in a gsm environment 

      Antón Haro, Carles; Rodríguez Fonollosa, José Adrián; Rodríguez Fonollosa, Javier (1996)
      Text en actes de congrés
      Accés obert
      In this paper, we present an algorithm based on the Hidden Markov Models (HMM) theory to solve the problem of blind channel estimation and sequence detection in mobile digital communications. The environment in which the ...

    • Channel estimation for transform modulations in mobile communications 

      Lamarca Orozco, M. Meritxell; Vázquez Grau, Gregorio (1996)
      Text en actes de congrés
      Accés obert
      This paper deals with data-aided channel estimation in systems using OFDM modulation. We formulate a pilot symbol-based channel estimator and compare it with the pilot-tone one proposed in [1]. Although this paper focuses ...

    • Channel training procedures for MIMO interfering point-to-multipoint channel 

      Agustín de Dios, Adrián; Lagén Morancho, Sandra; Vidal Manzano, José (2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A precise knowledge of the MIMO channel between the serving node and the user equipment (UE) is important for attaining good data rates in downlink transmissions (DL) in cellular systems. The interfering point-tomulti ...

    • Channel-wise early stopping without a validation set via NNK polytope interpolation 

      Bonet Solé, David; Ortega, Antonio; Ruiz Hidalgo, Javier; Sarath Shekkizhar, Sarath (2021)
      Text en actes de congrés
      Accés obert
      State-of-the-art neural network architectures continue to scale in size and deliver impressive generalization results, although this comes at the expense of limited interpretability. In particular, a key challenge is to ...

    • Joint pilot and precoder design for optimal throughput 

      Pastore, Adriano; Joham, Michael; Rodríguez Fonollosa, Javier (Institute of Electrical and Electronics Engineers (IEEE), 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      For single-user, multiple-input multiple-output (MIMO) channels with Rayleigh fading correlated at the transmitter side, and where the receiver only has partial channel knowledge in form of an MMSE channel estimate, we ...

    • MIMO signal processing in offset-QAM based filter bank multicarrier systems 

      Pérez Neira, Ana Isabel; Caus, Marius; Rostom, Zakaria; Le Ruyet, Didier; Kofidis, Eleftherios; Haardt, Martin; Mestre, Xavier; Cheng, Yao (2016-11-01)
      Article
      Accés obert
      Next-generation communication systems have to comply with very strict requirements for increased flexibility in heterogeneous environments, high spectral efficiency, and agility of carrier aggregation. This fact motivates ...

    • MIMO-OFDM: Channel Shortening 

      Segarra López, Guillem (Universitat Politècnica de Catalunya / Beijing Institute of Technology, 2013-07-31)
      Projecte/Treball Final de Carrera
      Accés obert
      Realitzat a/amb:   Beijing gong ye xue yuan
      [ANGLÈS] The study begins with the Multi-carrier modulation, to study the behavior OFDM with MIMO. Ends with an extensive study of the different methods used to implement the technique known as Channel Shortening.

    • On a mutual information and a capacity bound gap of pilot-aided MIMO channels 

      Pastore, Adriano; Joham, Michael; Rodríguez Fonollosa, Javier (Institute of Electrical and Electronics Engineers (IEEE), 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      For single-user MIMO channels with partial re ceiver CSI, we study the difference between a lower bound and two alternative upper bounds of the mutual information achieved with Gaussian codebooks. These differences are ...

    • Optimized training signal design 

      Maros, Marie (Universitat Politècnica de Catalunya, 2014-02)
      Projecte/Treball Final de Carrera
      Accés obert
      Realitzat a/amb:   Kungliga Tekniska högskolan
      [ANGLÈS] In this thesis, the problem of finding an optimal training sequence for estimating a MIMO flat fading channel with spatially and temporally correlated Gaussian noise is considered. The methods analyzed tailor the ...

    • Perpetual reconfigurable intelligent surfaces through in-band energy harvesting: architectures, protocols, and challenges 

      Ntontin, Konstantinos; Boulogeorgos, Alexandros Apostolos A.; Abadal Cavallé, Sergi; Mesodiakaki, Agapi; Chatzinotas, Symeon; Ottersten, Björn (Institute of Electrical and Electronics Engineers (IEEE), 2024-03)
      Article
      Accés obert
      Reconfigurable intelligent surfaces (RISs) are considered a key enabler of highly energy-efficient 6G and beyond networks. This property arises from the absence of power amplifiers in the structure, in contrast to active ...

    • Pilot contamination reduction in massive MIMO systems 

      Liesegang Maria, Sergi (Universitat Politècnica de Catalunya, 2017)
      Projecte Final de Màster Oficial
      Accés obert
      Realitzat a/amb:   Technische Universität München
      Massive MIMO systems have been pointed out as one of the possible strategies to enhance system performance and reach the high data rates modern wireless communications demand. It represents a breakthrough in modern ...

    • Ranging estimation error in WiFi devices running IEEE 802.11mc 

      Martín Escalona, Israel; Zola, Enrica Valeria (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Indoor positioning is still considered an open issue, especially when general-purpose communication networks are used to observe the metrics for positioning. IEEE 802.11mc aims at providing positioning capabilities to Wi-Fi ...

    • Sparse channel estimation based on compressed sensing theory for UWB systems 

      Lagunas Targarona, Eva (Universitat Politècnica de Catalunya, 2010-12-23)
      Projecte Final de Màster Oficial
      Accés obert
      Català: L'estimació de canal en receptors wireless esdevé un factor determinant a l'hora de incrementar les prestacions dels sistemes sense fils per tal de satisfer les exigències cada vegades més elevades dels consumidors ...

    • Waveform-independent frame-timing acquisition for UWB signals 

      López Salcedo, José Antonio; Vázquez Grau, Gregorio (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-01-31)
      Article
      Accés obert
      In this paper, the problem of frame-level symbol timing acquisition for UWB signals is addressed. The main goal is the derivation of a frame-level timing estimator which does not require any prior knowledge of neither ...

    • WLAN throughput improvement via distributed queuing MAC 

      Alonso Zárate, Luis Gonzaga; Ferrús Ferré, Ramón Antonio; Agustí Comes, Ramon (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-04)
      Article
      Accés obert
      This paper analyzes the performance of a MAC scheme for wireless local area networks (WLANs) that makes use of distributed queues to improve radio channel utilization. Analytical values for the maximum throughput performance ...