Josep Cotrina

Learn More
In the present paper we expose the development of a real-time monitoring prototype of human activities using a single cell phone equipped with some sensors. The monitoring system is reduced to the minimum expression; no special hardware is required as far as a conventional cell phone will monitor the user, classify the user activities with respect to a(More)
Most studies about the performance of IEEE 802.11 are limited to a single cell environment. Nevertheless, the idea of designing an outdoor cellular network based on WLAN IEEE 802.11 results very attractive, due to the several advantages that this technology presents: the low cost of the equipment, its operation in unlicensed spectrum and its higher data(More)
Resumen—Se han propuesto diferentes mecanismos para proporcionar calidad de servicio a las redes IEEE 802.11 desde la publicación de su primer estándar. Sin embargo, los estudios basados en la asignación de los tiempos de acceso AIFS según IEEE 802.11e revelan que los diferentes niveles de prioridad trabajan de forma sincronizada. Los estudios muestran que(More)
In this paper we present constructions of traceability codes based on the Chinese Remainder Theorem. Taking into account the non-uniformity of the alphabet of the code, we derive a new expression for the minimum distance that allows us to provide a criterion to obtain traceability codes with the maximum number of code words. In order to make the(More)
  • 1