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Browsing by Author "Guillén i Fábregas, A. (Albert)"

Browsing by Author "Guillén i Fábregas, A. (Albert)"

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  • Martínez, Alfonso, 1973-; Scarlett, Jonathan; Dalai, Marco; Guillén i Fábregas, A. (Albert) (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    This paper derives a saddlepoint approximation for the random-coding bound to the error probability of channel coding by using complex-integration techniques. The approximation is given by a sum of two terms: one with ...
  • Scarlett, Jonathan; Somekh-Baruch, Anelia; Martínez, Alfonso, 1973-; Guillén i Fábregas, A. (Albert) (Institute of Electrical and Electronics Engineers (IEEE), 2015)
    This paper studies the mismatched decoding problem for binary-input discrete memoryless channels. An example is provided for which an achievable rate based on superposition coding exceeds the Csiszár-Körner-Hui rate, thus ...
  • Tauste Campo, Adrià, 1982-; Vazquez-Vilar, Gonzalo; Guillén i Fábregas, A. (Albert); Koch, Tobias; Martínez, Alfonso, 1973- (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    This paper studies the random-coding exponent of joint source-channel coding for a scheme where source messages are assigned to disjoint subsets (referred to as classes), and codewords are independently generated according ...
  • Cocco, Giuseppe; Guillén i Fábregas, A. (Albert); Font Segura, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2021)
    For random-coding ensembles with pairwise-independent codewords, we show that the probability that the exponent of a given code from the ensemble being smaller than an upper bound on the typical random-coding exponent is ...
  • Dabirnia, Mehdi; Martínez, Alfonso, 1973-; Guillén i Fábregas, A. (Albert) (Institute of Electrical and Electronics Engineers (IEEE), 2021)
    The optimal quantization of the outputs of binary-input discrete memoryless channels is considered, whereby the optimal quantizer preserves at least a constant α-fraction of the original mutual information, with the smallest ...
  • Kangarshahi, Ehsan Asadi; Guillén i Fábregas, A. (Albert) (Institute of Electrical and Electronics Engineers (IEEE), 2021)
    We derive a single-letter upper bound to the mismatched-decoding capacity for discrete memoryless channels. The bound is expressed as the mutual information of a transformation of the channel, such that a maximum-likelihood ...
  • Kangarshahi, Ehsan Asadi; Guillén i Fábregas, A. (Albert) (Institute of Electrical and Electronics Engineers (IEEE), 2021)
    We derive a sphere-packing error exponent for mismatched decoding over discrete memoryless channels. We find a lower bound to the probability of error of mismatched decoding that decays exponentially for coding rates smaller ...
  • Font-Segura, Josep; Martínez, Alfonso, 1973-; Guillén i Fábregas, A. (Albert) (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    This paper provides an asymptotic expansion of the error probability, as the codeword length n goes to infinity, in quasi-static binary symmetric channels. After the leading term, namely the outage probability, the next ...
  • Font-Segura, Josep; Martínez, Alfonso, 1973-; Guillén i Fábregas, A. (Albert) (Institute of Electrical and Electronics Engineers (IEEE), 2019)
    Saddlepoint approximations to the error probability are derived for multiple-cost-constrained random coding ensembles where codewords satisfy a set of constraints. Constantcomposition inputs over a binary symmetric channel ...
  • Vazquez-Vilar, Gonzalo; Tauste Campo, Adrià, 1982-; Guillén i Fábregas, A. (Albert); Martínez, Alfonso, 1973- (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Two alternative exact characterizations of the minimum error probability of Bayesian M-ary hypothesis testing are derived. The first expression corresponds to the error probability of an induced binary hypothesis test and ...
  • Rezazadeh, Arezou (Universitat Pompeu Fabra, 2019-10-09)
    Due to delay constraints of modern communication systems, studying reliable communication with finite-length codewords is much needed. Error exponents are one approach to study the finite-length regime from the ...
  • Scarlett, Jonathan; Peng, Li; Merhav, Neri; Martínez, Alfonso, 1973-; Guillén i Fábregas, A. (Albert) (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    This paper studies expurgated random-coding bounds and exponents for channel coding with a given (possibly suboptimal) decoding rule. Variations of Gallager's analysis are presented, yielding several asymptotic and ...
  • Guillén i Fábregas, A. (Albert); Land, Ingmar; Martínez, Alfonso, 1973- (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    This paper determines the range of feasible values of standard error exponents for binary-input memoryless symmetric channels of fixed capacity C and shows that extremes are attained by the binary symmetric and the binary ...
  • Boutros, Joseph Jean; Zémor, Gilles; Guillén i Fábregas, A. (Albert); Biglieri, Ezio (Institute of Electrical and Electronics Engineers (IEEE), 2008)
    We show how to build full-diversity product codes under both iterative encoding and decoding over non-ergodic channels, in presence of block erasure and block fading. The concept of a rootcheck or a root subcode is introduced ...
  • Boutros, Joseph Jean; Zémor, Gilles; Guillén i Fábregas, A. (Albert); Biglieri, Ezio (Institute of Electrical and Electronics Engineers (IEEE), 2008)
    A new graph-based construction of generalized low density codes (GLD-Tanner) with binary BCH constituents is described. The proposed family of GLD codes is optimal on block erasure channels and quasi-optimal on block fading ...
  • Tauste Campo, Adrià, 1982-; Guillén i Fábregas, A. (Albert); Biglieri, Ezio (Institute of Electrical and Electronics Engineers (IEEE), 2009)
    We analyze multiuser detection under the assumption that the number of users accessing the channel is unknown by the receiver. Our main goal is to determine the performance loss caused by the need for estimating the ...
  • Font Segura, Josep; Martínez, Alfonso, 1973-; Guillén i Fábregas, A. (Albert) (Institute of Electrical and Electronics Engineers (IEEE), 2020)
    This paper proposes an efficient simulation method based on importance sampling to estimate the random-coding error probability of coded modulation. The technique is valid for complex-valued modulations over Gaussian ...
  • Tamir, Ran; Merhav, Neri; Weinberger, Nir; Guillén i Fábregas, A. (Albert) (Institute of Electrical and Electronics Engineers (IEEE), 2020)
    This work studies the deviations of the error exponent of the constant composition code ensemble around its expectation, known as the error exponent of the typical random code (TRC). In particular, it is shown that the ...
  • Boutros, Joseph Jean; Guillén i Fábregas, A. (Albert); Biglieri, Ezio; Zémor, Gilles (Institute of Electrical and Electronics Engineers (IEEE), 2010)
    We design powerful low-density parity-check (LDPC) codes with iterative decoding for the block-fading channel. We first study the case of maximum-likelihood decoding, and show that the design criterion is rather straightforward. ...
  • Asyhari, A. Taufiq; Guillén i Fábregas, A. (Albert) (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    We study transmission over multiple-input multiple-output block-fading channels with imperfect channel state information (CSI) at both the transmitter and receiver. In particular, based on mismatched decoding theory for a ...

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