Abstract-In this paper, we introduce an analytical framework to compute the average rate of downlink heterogeneous cellular networks. The framework leverages recent application of stochastic geometry to other-cell interference modeling and analysis. The heterogeneous cellular network is modeled as the superposition of many tiers of Base Stations (BSs) having different transmit power, density, path-loss exponent, fading parameters and distribution, and unequal biasing for flexible tier association. A long-term averaged maximum biased-received-power tier association is considered. The positions of the BSs in each tier are modeled as points of an independent Poisson Point Process (PPP). Under these assumptions, we introduce a new analytical methodology to evaluate the average rate, which avoids the computation of the Coverage Probability (Pcov) and needs only the Moment Generating Function (MGF) of the aggregate interference at the probe mobile terminal. The distinguishable characteristic of our analytical methodology consists in providing a tractable and numerically efficient framework that is applicable to general fading distributions, including composite fading channels with small-and mid-scale fluctuations. In addition, our method can efficiently handle correlated Log-Normal shadowing with little increase of the computational complexity. The proposed MGFbased approach needs the computation of either a single or a two-fold numerical integral, thus reducing the complexity of Pcov-based frameworks, which require, for general fading distributions, the computation of a four-fold integral.Index Terms-Heterogeneous cellular networks, aggregate interference modeling, stochastic geometry, average rate.

- Avances en la teoría e investigación de la creatividad:Un manifiesto sociocultural 1 Avances en la teoría e investigación de la creatividad: Un manifiesto sociocultural -99 - ResumenEste manifiesto, discutido por 20 académicos y académicas que representan diversas líneas de investigación sobre la creatividad, marca un cambio conceptual dentro de los estudios de este campo. Los enfoques socioculturales han hecho contribuciones sustanciales al concepto de creatividad en las últimas décadas y hoy pueden proporcionar un conjunto de propuestas para guiar nuestra comprensión de la investigación anterior y generar nuevas direcciones en investigación y práctica. Estas proposiciones son urgentemente necesarias en respuesta a la transición de una Sociedad de la Información a una Sociedad Post-Información. A través de las proposiciones descritas aquí, nuestro objetivo es construir un terreno común e invitar a la comunidad de investigadores y profesionales de la creatividad a reflexionar, estudiar y cultivar la creatividad como un fenómeno sociocultural. AbstractThis manifesto, discussed by 20 scholars, representing diverse lines of creativity research, marks a conceptual shift within the field. Socio-cultural approaches have made substantial contributions to the concept of creativity over recent decades and today can provide a set of propositions to guide our understanding of past research and to generate new directions of inquiry and practice. These propositions are urgently needed in response to the transition from the Information Society to the Post-Information Society. Through the propositions outlined here, we aim to build common ground and invite the community of creativity researchers and practitioners to reflect up, study, and cultivate creativity as a sociocultural phenomenon.

We consider a windowed decoding scheme for LDPC convolutional codes that is based on the belief-propagation (BP) algorithm. We discuss the advantages of this decoding scheme and identify certain characteristics of LDPC convolutional code ensembles that exhibit good performance with the windowed decoder. We will consider the performance of these ensembles and codes over erasure channels with and without memory. We show that the structure of LDPC convolutional code ensembles is suitable to obtain performance close to the theoretical limits over the memoryless erasure channel, both for the BP decoder and windowed decoding. However, the same structure imposes limitations on the performance over erasure channels with memory.

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