Zero-Delay Joint Source Channel Coding for a Bivariate Gaussian Source over the Broadcast Channel with One-Bit ADC Front Ends

In this work, we consider the zero-delay transmission of bivariate Gaussian sources over a Gaussian broadcast channel with one-bit analog-to-digital converter (ADC) front ends. An outer bound on the conditional distortion region is derived. Focusing on the minimization of the average distortion, two types of methods are proposed to design nonparametric mappings. The first one is based on the joint optimization between the encoder and decoder with the use of an iterative algorithm. In the second method, we derive the necessary conditions to develop the optimal encoder numerically. Using these necessary conditions, an algorithm based on gradient descent search is designed. Subsequently, the characteristics of the optimized encoding mapping structure are discussed, and inspired by which, several parametric mappings are proposed. Numerical results show that the proposed parametric mappings outperform the uncoded scheme and previous parametric mappings for broadcast channels with infinite resolution ADC front ends. The nonparametric mappings succeed in outperforming the parametric mappings. The causes for the differences between the performances of two nonparametric mappings are analyzed. The average distortions of the parametric and nonparametric mappings proposed here are close to the bound for the cases with one-bit ADC front ends in low channel signal-to-noise ratio regions.

Evolución y desarrollo del bádminton español 2000-2019 (Evolution and development of the Spanish badminton 2000-2019)

La gestión del deporte contemporáneo gira en torno a la performance organizacional y su consecuencia en la performance deportiva. Se diseñó un estudio de casos, ex post facto, un análisis retrospectivo (2000-2019) de una unidad organizacional (Federación Española de Bádminton, FESBA) de naturaleza preferentemente cualitativa, que interactúa con predicciones estadísticas y análisis de las evoluciones temporales. El estudio contempla cinco dimensiones (Económica, Deportiva, Social, Organizativa y Difusión) y veinticinco variables. La dimensión social, económica, organización de competiciones nacionales, calidad de los resultados y difusión se muestran como indicadores claves (dimensiones palancas). La dimensión económica correlaciona con licencias de deportistas, número de clubes y competiciones nacionales organizadas (Rho=.964, .967 y .904 respectivamente). La dimensión organizativa tuvo una consecuencia directa en un aumento de las competiciones nacionales, consiguiendo un mayor interés por el seguimiento del bádminton en los canales de difusión (Rho=.838). Se han apreciado crecimientos estables en la dimensión social. Es a partir de 2014 cuando se acentúa esta evolución, coincidiendo con una estrategia audiovisual por parte de FESBA y una proyección de la figura de Carolina Marín. Los recursos de la FESBA han permitido obtener un mayor número de practicantes generando más licencias escolares, en un sistema de competiciones nacionales, con un incremento de la variable calidad de resultados, simultáneamente con un mayor número de licencias federadas y clubes. Esta afirmación interactúa con el efecto de difusión en TV y medios. Se demuestra la sincronía entre la evolución de los datos analizados y el desempeño materializado en los distintos programas desarrollados por FESBA. Abstract. The management of contemporary sports is based on organizational performance and its consequence in sports performance. An ex post facto case study was designed, a retrospective analysis (2000-2019) of an organizational unit (Spanish Badminton Federation, FESBA) of apreferably qualitative nature, which interacts with statistical predictions and analysis of temporal evolutions. The study includes five dimensions (Economic, Sports, Social, Organizational and Dissemination) and twenty-five variables. The social and economic dimensions, the organization of national competitions, the quality of the results and the dissemination are shown as key indicators (leverage dimensions). The economic dimension correlates with sportsman's licenses, number of clubs and organized national competitions (Rho = .964, .967 and .904 respectively). The organizational dimension had a direct consequence in anncrease in national competitions, achieving a greater interest in broadcast channels (Rho = .838). Stable growth has been observed in the social dimension. It is from 2014 when this evolution is accentuated, coinciding with an audiovisual strategy by FESBA and a projection of the figure of Carolina Marín. The resources of the FESBA have made it possible to obtain a greater number of practitioners generating more school licenses, in a system of national competitions, with an increase in the variable quality of results, simultaneously with a greater number of official licenses and clubs. This statement interacts with the broadcast effect on TV and the media. The synchrony between the evolution of the data analyzed and the performance materialized in the different programs developed by FESBA is demonstrated.

Exposure of 4-year to 24-year olds to tobacco imagery on prime-time Chilean television

IntroductionThe extent of the population’s exposure to tobacco imagery across all genres of regular TV programming and the contribution of each of these genres is unknown, except for UK broadcast channels. The objective of this study is to estimate the exposure of young people to tobacco imagery on Chilean prime-time television and the programme source contributing to such exposure.MethodsProgrammes aired during 3 weeks in 2019 from the 15 highest audience channels in Chile were content-analysed for the occurrence of tobacco categorised as actual use, implied use, tobacco paraphernalia, tobacco brand appearances and whether they violated Chilean smoke-free law for each 1 min interval (92 639). The exposure of young people to tobacco content was estimated using media viewership figures.ResultsYoung people received 29, 11 and 4 million tobacco impressions of any type, explicit use and smoke-free violation, respectively, at a rate of 21.8, 8.0 and 2.1 thousand impressions per hour of TV viewing. The main sources of exposure to tobacco impressions were feature films and animated productions, which were almost entirely non-Chilean. Finally, young people were exposed to tobacco brand impressions primarily through films, effectively circumventing the advertising ban in Chile.DiscussionTelevision programming is a source of significant youth exposure to tobacco imagery, including branding impressions. To conform to the WHO FCTC, Chile should prohibit tobacco branding in any TV programme and require strong anti-tobacco advertisements prior to any TV programme portraying tobacco.

A Tracking Method in FM Broadcast-based Passive Radar Systems

Passive radars are popular because without the expensive, high-power-rated RF components, they are much cheaper than the active ones, nevertheless, they are much harder to detect from their electromagnetic emission. Passive radars produce so-called RV matrices in an intermediate signal processing step. Although accurate RV matrices are found in DVBT-based passive radars, the characteristics of the FM signals are not always suitable for this purpose. In those situations, further signal processing causes false alarms and unreliable plots, misleads the tracker, and consumes power for processing unnecessarily, which matters in portable setups. Passive radars also come with the advantage of a possible MIMO setup, when multiple signal sources (broadcast services for example) are reflected by multiple targets to the receiver unit. One common case is the stealth aircraft’s which form is designed to reflect the radar signal away from the active radar, but it could also reflect the signals of the available broadcast channels. Only one of these reflected signals could reveal the position of the target.