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October 2005 - present
Publications
Publications (37)
La utilización de diferentes programas software en la realización de prácticas de laboratorio suele conllevar problemas tanto para el profesorado como para el alumnado, por el hecho de llevar a cabo la instalación y mantenimiento de los programas, los cuales a veces suelen presentar problemas de compatibilidad derivados de actualizaciones. En este...
This work presents a wireless acoustic sensor network (WASN) that monitors urban environments by recognizing a given set of sound events or classes. The nodes of the WASN are Raspberry Pi devices that not only record the ambient sound, but also detect and recognize different sound events. All the signal processing tasks, from the recording to the c...
We present in this paper a wireless acoustic sensor network (WASN) that recognizes a set of sound events or classes from urban environments. The nodes of the WASN are Raspberry Pi devices that not only record the ambient sound, but they also process and recognize a sound event by means of a deep convolutional neural network (CNN). To our knowledge,...
When a video is encoded with constant quality, the resulting bitstream will have variable bitrate due to the inherent nature of the video encoding process. This paper proposes a video Adaptive Bitrate Streaming (ABR) algorithm, called Look Ahead, which takes into account this bitrate variability in order to calculate, in real time, the appropriate...
The paper is based on the study of the performance of a Dynamic Adaptive Streaming over HTTP (DASH) system in the context of 3D video streaming, using different scenarios and network conditions, specifically with bandwidth variations. The objective is the development of a framework for the evaluation of QoE in 3D adaptive video streaming scenarios,...
This document presents a framework for the evaluation of DASH (Dynamic Adaptive Streaming over HTTP) systems, which allows performance measurements to be carried out in an automated and systematic way. We have used Puppeteer, the Node.js library developed by Google, which provides a high level API. This API allows us to automate actions on Chrome D...
We propose in this paper an algorithm for available bandwidth estimation in mobile ad hoc networks and its integration into a conventional routing protocol like AODV for improving the rate-adaptive video streaming. We have introduced in our approach a local estimation of the available bandwidth as well as a prediction of the consumed bandwidth. Thi...
This paper presents and evaluates a system that provides TV and radio services in mobility using 4G communications. The system has mainly two blocks, one on the cloud and another on the mobile vehicle. On the cloud, a DVB (Digital Video Broadcasting) receiver obtains the TV/radio signal and prepares the contents to be sent through 4G. Specifically,...
This paper proposes a video quality adaptation algorithm based on the Dynamic Adaptive Streaming over HTTP (DASH) standard for on-demand video services. When a video is encoded with constant quality, the resulting bitstream has variable bitrate due to the inherent nature of the video encoding process. The proposed algorithm, called Look Ahead, take...
La distribución de contenidos multimedia, y en particular el streaming de vídeo, domina actualmente el tráfico global de Internet y su importancia será incluso mayor en el futuro. Miles de títulos se agregan mensualmente a los principales proveedores de servicios, como Netflix, YouTube y Amazon. Y de la mano del consumo de contenidos de alta defini...
Multimedia content adaption strategies are becoming increasingly important for effective video streaming over the actual heterogeneous networks. Thus, evaluation frameworks for adaptive video play an important role in the designing and deploying process of adaptive multimedia streaming systems. This paper describes a novel simulation framework for...
This paper presents the design and implementation of an experimental testbed for the evaluation of ad hoc wireless networks, using the IEEE 802.11 standard. Specifically, we implemented a set of 10 ad hoc nodes using low cost hardware platforms (Raspberry Pi) with embedded Linux. Also, an application based on Node.js was developed for the control o...
This paper presents the design and implementation of a set of prototype nodes that have the ability to establish communication links in ad hoc mode. The prototypes were implemented using low cost, single board computers with embedded Linux (Raspberry Pi devices). The implemented stations aim to set a wireless sensor network for the capture of varia...
This paper presents a proposal to optimize energy consumption in ad hoc networks based on the OLSR
protocol. This approach focuses on the set up of routes with less congestion level and higher energy
capacity. Therefore, in addition to the remaining energy of nodes, a new metric is introduced, the strategic
value, which reports the importance of a...
This paper presents a performance evaluation of the scalable video streaming over mobile ad hoc networks. In particular, we focus on the rate-adaptive method for streaming scalable video (H.264/SVC). For effective adaptation a new cross-layer routing protocol is introduced. This protocol provides an efficient algorithm for available bandwidth estim...
The development of video streaming services on wireless ad hoc networks is a challenge task as a consequence of different limitations such as bandwidth-constrained, variable capacity links and energy-constrained operation. Moreover, the dynamic topology of nodes causes frequent link failures and high error rates. We propose in this paper a performa...
This paper presents a performance evaluation of the scalable video streaming over mobile ad hoc networks. In particular, we focus on the rate-adaptive method for streaming scalable video (H.264/SVC). For effective adaptation a new cross-layer routing protocol is introduced. This protocol provides an efficient algorithm for available bandwidth estim...
One of the major challenges for the transmission of time-sensitive data like video over mobile ad-hoc networks (MANETs) is the deployment of an end-to-end QoS support mechanism. Therefore, several approaches and enhancements have been proposed concerning the routing protocols. In this paper we propose a new QoS routing protocol based on AODV (named...
Energy constraints on wireless nodes represent a current field of research. Such restrictions are particularly significant because of the great amount of features and applications currently available on devices, which contribute to dramatically increase energy consumption. However, when transmitting delay-sensitive data, such as multimedia streamin...
This paper describes how File Delivery over Unidirectional Transport (FLUTE) and Dynamic Adaptive Streaming over Hypertext Transfer Protocol (DASH) can be used to provide mobile video streaming services over broadcast wireless networks. FLUTE is a multicast protocol for multimedia file download. In this proposal, the protocol is adapted to provide...
Energy constraint affects significantly the connectivity
and operation time in Ad-Hoc Networks. In this sense, there are
previous studies that propose optimizations through residual
energy information on nodes. However these solutions do not
consider some features of wireless environment that increase
energy expenditure such as overhearing in inter...
Video streaming services have restrictive delay and bandwidth constraints. Ad hoc networks represent a hostile environment for this kind of real-time data transmission. Emerging mesh networks, where a backbone provides more topological stability, do not even assure a high quality of experience. In such scenario, mobility of terminal nodes causes li...
Traditionally, wireless ad hoc networks have been used for emergency situations due to the feasibility of fast deployment and connectivity. However, multimedia services are much demanded nowadays and bandwidth and delay requirements of these kinds of services are very restrictive. Offering real-time video services in wireless ad hoc networks is not...
The analysis of social media has a great potential in improving the Quality of Experience (QoE) of media services. In this context, video delivery over IP networks is one of the processes that could benefit from the analysis of the social aspects associated to broadband video services. This chapter presents Network Intelligence as a technology enab...
This paper presents the GrafiTV project, which aims at developing an interactive and personalized information system over future audiovisual content in real time. The system is intended to be used by new connected TVs and mobile devices with multimedia capabilities, such as tablets or smartphones. The system allows the personalized insertion of add...
Mobile ad hoc networks (MANETs) offer an excellent scenario for deploying communication applications because of the connectivity and versatility of this kind of networks. In contrast, the topology is usually extremely dynamic causing high rate of packet loss, so that ensuring a specific Quality of Service (QoS) for real-time video services becomes...
Video services are much demanded nowadays but bandwidth and delay requirements of this kind of services are very restrictive. Offering real-time video services in wireless ad-hoc networks is not an easy task because of the difficulty of guaranteeing certain quality in a shared medium. Practical solutions should try to improve communications at (and...
The communications inside MANETs usually show frequent disruptions due to changes in topology and the condition of having a shared physical channel. It is necessary to implement a mechanism to maintain connectivity and ensure Quality of Service (QoS). In this paper we introduce a route recovery mechanism for a QoS routing protocol called AQA-AODV (...
Offering a real time video transmission service, using mobile ad hoc networks (MANETs) and granting a specific Quality of Service (QoS) and Quality of Experience (QoE) is a hard challenge. In fact, the network topology is extremely unstable and its variability causes the loss of transmitted information. However, powerful mechanisms against channel...
According to recent reports, millions of workers suffer from dorso-lumbar pain due to their occupation. This problem affects people, who work seated in front of a screen; who have to stand up for long periods of time; who have to handle heavy weights; or who have to endure forced and awkward postures. In this paper, a system is proposed to allow th...
Offering a real time video transmission service, using mobile ad hoc networks (MANETs) and granting a specific Quality of Service (QoS) is a hard challenge. In fact, the network topology is extremely unstable and its variability causes the loss of transmitted information. However, powerful mechanisms against channel failures can be incorporated to...
Due to bandwidth constraint and highly dynamic topology in ad hoc network systems, one of the major challenges is the deployment of end-to-end quality-of service support mechanisms. Time-sensitive communications like video applications may be seriously disrupted if these QoS support mechanisms don’t exist. In this paper we propose a QoS routing pro...
This paper describes the main challenges of implementing a Multimedia on Demand system (TetraMoD) for emergency scenarios. The objective of this system is to offer a complete solution for providing multimedia services (Video on Demand and Reliability File Transfer) to a rescue team in an emergency situation. This multimedia system will improve the...
A performance evaluation of real time services (such as video streaming) over mobile ad-hoc networks using both hierarchical and flat routing protocols is shown in this paper. A variety of workload and scenarios, as characterized by mobility, load and size of the ad hoc network have been simulated using NS-2. We use OLSR (Optimized Link State Proto...
1889-8297 / Waves · 2009 · year 1 24 of sending and receiving real-time information like video. Nowadays, a great interest is focused on Mobile Ad hoc Networks (MANETs) (Figure 1). MANETs are formed by mobile nodes, which are connected via wireless links without using an ex-isting network infrastructure. Thus, MANETs don't require any fixed infrast...
