Now showing items 41-55 of 55

    • Optimal coding and the origins of Zipfian laws 

      Ferrer Cancho, Ramon; Bentz, Christian; Seguin, Caio (Informa UK (Taylor & Francis), 2020-07-24)
      Article
      Restricted access - publisher's policy
      The problem of compression in standard information theory consists of assigning codes as short as possible to numbers. Here we consider the problem of optimal coding – under an arbitrary coding scheme – and show that it ...
    • Optimization models of natural communication 

      Ferrer Cancho, Ramon (2018-07-03)
      Article
      Open Access
      A family of information theoretic models of communication was introduced more than a decade ago to explain the origins of Zipf’s law for word frequencies. The family is a based on a combination of two information theoretic ...
    • Polar coding for common message only wiretap broadcast channel 

      Olmo Alòs, Jaume del; Rodríguez Fonollosa, Javier (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference lecture
      Restricted access - publisher's policy
      A polar coding scheme is proposed for the Wiretap Broadcast Channel with two legitimate receivers and one eavesdropper. We consider a model in which the transmitter wishes to send a private and a confidential message that ...
    • Publicness, privacy and confidentiality in the single-serving quantum broadcast channel 

      Salek Shishavan, Farzin; Hsieh, Min-Hsiu; Rodríguez Fonollosa, Javier (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference lecture
      Restricted access - publisher's policy
      The 2-receiver broadcast channel with primary and third-party receivers is studied. The messages are classified into public, private and confidential. The messages in the public class are messages intended for both receivers. ...
    • Quantum Technologies for Information Processing 

      Tura I Brugués, Jordi (Universitat Politècnica de Catalunya, 2011-07-27)
      Master thesis (pre-Bologna period)
      Open Access
      English: Since its genesis, quantum mechanics has proved to be a very accurate model for predicting the behavior of the world below the nanoscale. However, crucial breakthroughs in technology were needed in order to be ...
    • Retrospective interference alignment for the MIMO interference broadcast channel 

      Torrellas, Marc; Agustín de Dios, Adrián; Vidal, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Conference report
      Restricted access - publisher's policy
      Retrospective Interference Alignment is a linear precoding strategy that seizes delayed channel state information at the transmitters (CSIT), improving the degrees of freedom (DoF) that can be achieved without CSIT for ...
    • Revocation of users in RSA attribute-based signatures 

      Fueyo Pestaña, Maria Rosa (Universitat Politècnica de Catalunya, 2014-07)
      Bachelor thesis
      Open Access
      An attribute-based signature with respect to a signing policy chosen by the signer, convinces the verifer that the signer sustains a subset of attributes satisfying that signing policy. The verifier must not obtain any ...
    • RLWE-based distributed key generation and threshold decryption 

      Alborch Escobar, Ferran (Universitat Politècnica de Catalunya, 2021-07)
      Master thesis
      Open Access
      Ever since the appearance of quantum computers, prime factoring and discrete logarithm based cryptography has been put in question, giving birth to the so called post-quantum cryptography. The most prominent field in ...
    • Single-serving quantum broadcast channel with common, individualized, and confidential messages 

      Salek Shishavan, Farzin; Hsieh, Min-Hsiu; Rodríguez Fonollosa, Javier (2020-12)
      Article
      Open Access
      The two-receiver broadcast channel with primary and third party receivers is studied. The sender wishes to reliably communicate a common (or public) message to both receivers as well as individualized and confidential ...
    • Sphericity minimum description length: asymptotic performance under unknown noise variance 

      Font Segura, Josep; Riba Sagarra, Jaume; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Conference report
      Open Access
      This paper revisits the model order selection problem in the context of second-order spectrum sensing in cognitive radio. Taking advantage of the recent interest on the generalized likelihood ratio (GLR), the asymptotic ...
    • The placement of the head that maximizes predictability: An information theoretic approach 

      Ferrer Cancho, Ramon (RAM-Verlag, 2017-01-01)
      Article
      Open Access
      The minimization of the length of syntactic dependencies is a well-established principle of word order and the basis of a mathematical theory of word order. Here we complete that theory from the perspective of information ...
    • The variation of Zipf's law in human language 

      Ferrer Cancho, Ramon (Springer, 2005)
      Article
      Open Access
      Words in humans follow the so-called Zipf's law. More precisely, the word frequency spectrum follows a power function, whose typical exponent is ß ˜ 2, but significant variations are found. We hypothesize that the full ...
    • Towards a healthcare digital twin 

      Angulo Bahón, Cecilio; Ortega Ramírez, Juan Antonio; Gonzalez Abril, Luis (IOS Press, 2019)
      Conference lecture
      Restricted access - publisher's policy
      The main aim of this short position paper is to introduce a proposal to orchestrate an ecosystem of manipulation of reliable and safe data, applied to the field of health, proposing the creation of digital twins for ...
    • Training data analysis for Gaussian process state space models 

      Ferreiro Alonso, Patricia (Universitat Politècnica de Catalunya, 2017-08-31)
      Bachelor thesis
      Open Access
      Covenantee:   Technische Universität München
      Gaussian Process State Space Models aim at constructing models of nonlinear dynamical systems capable of quantifying the uncertainty in their predictions. By means of sampling in a noisy environment and covariance functions, ...
    • Unravelling the community structure of the climate system by using lags and symbolic time-series analysis 

      Tirabassi, Giulio; Masoller Alonso, Cristina (Macmillan Publishers, 2016-07-11)
      Article
      Open Access
      Many natural systems can be represented by complex networks of dynamical units with modular structure in the form of communities of densely interconnected nodes. Unraveling this community structure from observed data ...