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OPNET Technologies © 2008 OPNET Technologies, Inc. |
University: Centro
Politécnico Superior. Universidad de Zaragoza Research: STUDY OF THE EFFECT OF WIRELESS TRANSMISSIONS ON
BIOMEDICAL SIGNALS ·
A. Alesanco, “Design and evaluation
of coding and transmission methods for electrocardiogram signals in real time
telecardiology systems”, PhD Thesis,
March 2007. This
thesis is devoted to provide new approaches and solutions suitable for
real-time ECG coding, transmission and monitoring in a telecardiology
application from a clinical point of view. It is structured in two main
chapters: the rst one is dedicated to present and
discuss the new approaches in real-time ECG signal compression and the second
one presents proposals of new transmission protocols and its eects in the quality of the monitoring process depending
on the characteristics of the communication network they have to face in the
transmission. ·
C. Hernández Ramos, A. Alesanco
Iglesias, V. Abadía, J. García
Moros. “The Effects of Wireless
Channel Errors on the Quality of Real Time Ultrasound Video
Transmission" .28th Annual International Conference IEEE
Engineering in Medicine and Biology Society (EMBS), New York City, USA, pp.
6457-60. Agosto. 2006.. Agosto. 2006. In this
paper the effect of the conditions of wireless channels on real time
ultrasound video transmission is studied. In order to simulate the
transmission through a wireless channel, the model of Gilbert-Elliot is used,
and the influence of its parameters in transmitted video quality is
evaluated. In addition, the efficiency of using both UDP and UDP-Lite as transport protocols has been studied. The effect
of using different video compression rates for XviD
codec is also analyzed. Based on the obtained results it is observed as the
election of the video compression rate depends on the bit error rate (BER) of
the channel, since the election of a high compression bit rate for video
transmission through a channel with a high BER can degrade the video quality
more than using a lower compression rate. On the other hand, it is observed
that using UDP as transport protocol better results in all the studied cases are obtained. · A. Alesanco Iglesias, R. Istepanian, J. García Moros. "Performance Study of Real-Time ECG Transmission in Wireless Networks" .The International Special Topic Conference on Information Technology in Biomedicine (ITAB 2006), Ioannina (Grecia)" . Octubre. 2006. An ECG
coding and transmission methodology for real-time telecardiology
applications using wireless networks is presented. The ECG signal is
segmented into blocks which are coded and packetized for transmission. The
compression method is based on the wavelet transform (WT) and the use of Set
Partitioning in Hierarchical Trees (SPIHT) algorithm. Transmission
simulations using TCP protocol through wireless channels with different
characteristics are presented and discussed. Specific values for relevant
parameters in the TCP protocol are proposed to enhance the quality of the
communications. Radio Resource Management in Cellular Broadband This project proposal is placed within the
intense research activity that, in the context of the development of
broadband mobile cellular systems, both standardizing boards and research
groups in public and private organizations are carrying out. The project, focused on OFDMA-based systems,
has the objective of developing efficient mechanisms to manage radio
resources in the air interface, tackling the detailed study of each of them
in a reference framework where the relation and coordination among all of
these mechanisms are considered in a detailed and explicit way. Specifically,
it is focused on the study, proposal, development and evaluation of Medium
Access Control (MAC) structures and protocols, capable of providing QoS, and in the coordinated development of dynamic
resource scheduling strategies among different users or among traffics of a
single user, adaptive selection of modulation and coding, interference
control, admission and congestion control, resource management under mobility
(handover), that allow to satisfy the demanded requirements regarding
quality, coverage and capacity, with the most efficient use of the available
resources. A differentiating aspect of the project is
the special emphasis in the search of solutions that provide capacity for
supporting multicast/broadcast multimedia services, as well as procedures of
coverage and capacity extension, based on the support of the mulihop relay operation mode. With an orientation towards the use of crosslayer approaches, a key aspect of the project is the
explicit consideration of the impact of the architecture over the
applicability of the proposals. In a reference framework where the
traditional models of a hierarchical architecture are abandoned in order to
bet on models with a flatter architecture, the project works on the
refinement and the study of the implications of aspects such as the location,
relation and coordination of the entities at a multicellular
level, of the functions with impact of the resource management and,
specifically, of the distribution architecture of the decision points of
coordination among cells and of the measurement and distribution of the
information that gives support to that coordination. We are now studying mobility management
(location and handover) and we are using OPNET as the simulation tool to
evaluate its performance. Teaching: We are using OPNET for teaching in
three subjects of the Telecommunications Engineering program in the Telematics Area of the Electronics Engineering and
Communications Department in the University of Zaragoza (SPAIN). The courses are the following Professors: Ángela Hernández
Solana (anhersol@unizar.es) José Ramón Gállego Martínez (jrgalleg@unizar.es) Contents: This subject is a laboratory located in the
fourth year of the telecommunications engineering degree. It is focused on
the basis of IP networks and WAN interconnection through different
technologies. The laboratory is divided into two parts (hardware and
software-simulation). The simulation part consists of four different
practices that we are developing with OPNET. CALIDAD DE SERVICIO (QoS) EN REDES DE NUEVA GENERACIÓN Professors: José Ramón Gállego Martínez (jrgalleg@unizar.es) Julián Fernández Navajas (navajas@unizar.es) Contents: The rapid evolution of the networking
industry introduces new exciting challenges that need to be explored by the
student. The adoption of Internet as the global network infrastructure places
the issue of quality of service among one of the hot topics nowadays: a huge
diversity of applications with quite different service requirements must be
supported over a basic core of protocols. OPNET is used as main tool to study
this new exciting challenges and as laboratory
research tool to discover the problems and possible solutions for next
generation network design. Key areas covered by the course are: -
Network Policy -
Quality of Service -
Real Time Applications -
Intelligent Networks -
Performance
Evaluation Professor: Antonio Valdovinos Bardají (toni@unizar.es) Contents: The aim of this subject is to show different wireless
technologies for accesing networks. By means of
OPNET, we have carried out some software-based practices in order to
consolidate the student knowledge about GSM and GPRS technologies. We have
based these practices on the GSM and GPRS contributed models published at
OPNET web site. OPNET
Technologies, Inc. is a leading provider of solutions for managing networks and
applications. OPNET's best-in-class solutions
address application troubleshooting, application monitoring, network monitoring, network configuration management, capacity management, and network simulation. OPNET’s solutions have been operationally proven in
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government enterprises, government and defense
agencies, network service providers, and network equipment manufacturers. For
more information about OPNET and its
products, visit www.opnet.com. |
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