I3A - Instituto de Investigación en Ingeniería de Aragón

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GCMMobile Communications Group
The Mobile Communications Group at the University of Zaragoza and the Aragon Institute of Engineering Research (I3A) has been recognized as a Grupo Consolidado de Investigación (Quality Research Group) by the Regional Government of Aragón.
 
The Mobile Communications Group, with an average workforce of 9 scientific staff (6 PhD graduates and 3 PHD students), has been working in the Mobile Communication field for more than fifteen years, specifically focused on mission critical communication systems. In this sense, the group has been able to perform conceptual studies (numerous Master Thesis Projects, Ph.D. Theses and several publications in high quality magazines have been produced in this field) and to implement hardware demonstrators based on the use of DSP and ASICs as well as the development of planning tools and applications for TETRA/TEDS, UMTS and LTE. On the conceptual studies point of view, the group has been widely involved in CDMA, TDMA an OFDMA issues concerning layers 1, 2 and 3. We have developed specific simulators for LTE, UMTS and TETRA/TEDS systems and Ad-Hoc networks, especially, but not only, concerning to physical and link layers, which allow to evaluate and to compare various technologies on the physical layer (e.g.: synchronization, channel estimation, equalization, channel coding, amplifier linearization, etc.) and to evaluate different proposals to manage different traffic models with their corresponding quality-based parameters. In the last case, research includes aspects regarding both link level and network level, involving traffic and capacity characterization and provision of quality of service in packet based wireless systems, cross-layer design of medium access control and radio resource management strategies for cellular and ad hoc, mesh networks (interference management, scheduling, mobility management, admission/access control for multimedia wireless systems, adaptive routing in ad-hoc networks,…), short range wireless technologies and positioning systems.

Research Lines

Information and Communication Technologies

Advanced mobile broadband wireless systems
Our work focuses on the design of advanced mobile broadband wireless systems: LTE and LTE Advanced Heterogeneous Networks (HetNet) based on relay, femto and pico base station solutions,...
Our work focuses on the design of advanced mobile broadband wireless systems: LTE and LTE Advanced Heterogeneous Networks (HetNet) based on relay, femto and pico base station solutions, including emerging broadband wireless systems for Public Safety. We work in the development of efficient radio resource management (RRM) at link and network level strategies: scheduling, power and rate control and interference management in standard and HetNet deployments. Special attention is paid to dynamic resource management, mobility management, admission control, selection/reselection of the access node, capacity analysis, and adaptive network configuration.
Design of reconfigurable power-efficient wireless transceivers for cognitive radios
Our work focuses on linearization and joint optimization techniques for power amplifiers, multi-/broadband antennas, and design, implementation and verification of adaptive impedance tuning...
Our work focuses on linearization and joint optimization techniques for power amplifiers, multi-/broadband antennas, and design, implementation and verification of adaptive impedance tuning circuits for broadband signals. This includes advanced physical layer technologies for cognitive radio communications, including transceivers design focused on facilitating the sensing and search for available spectrum holes, the control of the operating mode (AMC, FFT mode, etc.) and, also, the exploration of energy consumption vs. spectrum efficiency trade-offs.

Key Projects

Information and Communication Technologies

Design of Reconfigurable and Energy-Aware Transmission Architectures for Next Generation Mobile Communication Systems (TEC2014-58341-C4-2-R)
This project aims at developing new transmission technologies which are thought to improve considerably the power efficiency in recent communication network systems. Those transmission methods...
This project aims at developing new transmission technologies which are thought to improve considerably the power efficiency in recent communication network systems. Those transmission methods must fulfill strong requirements in terms of transmission rate, capacity and Quality of Service (QoS), because of the increasing amount of wireless data which arise not only in Public networks but also in Professional Mobile Radio (PMR) systems. As far as this context is considered, contributions are accomplished by each subproject from different but complementary points of view, which yields to a whole work in which this subproject approaches to several scientific and technologic challenges coming up from new architectures proposed for 5G access networks, as for example C-RAN. A massive use of low cost-high efficient MIMO transmission systems based on hybrid optical-radiofrequency technologies is expected. Thus, the analysis, evaluation and correction of phenomena which decrease the quality of the transmitted signal and whose source is not only every optoelectronic subsystem in the transmitter, but the feedback loop as well, are clearly key issues related to this project.
Advanced Broadband Mobile Systems. Radio Resource Management In Cellular Heterogeneous Networks And Distributed Mesh Networks (MAHTICES) (TEC2011-23037)
This project is placed within the scope of advanced mobile broadband systems, with particular interest in providing professional services. Heterogeneous cellular networks (based on the joint...
This project is placed within the scope of advanced mobile broadband systems, with particular interest in providing professional services. Heterogeneous cellular networks (based on the joint deployment of pico/femto cells and relay stations within macrocellular deployment) and distributed wireless mesh networks scenarios are considered. Within the heterogenous network scenarios project is focused on joint development of efficient RRM strategies: scheduling, power and rate control and interference management. Under varying load distribution and mobility conditions, the goal is the specification of protocols for adjusting operating parameters and dynamic resource management, admission control and handover and criteria for selection/reselection of the access node.
 
The ultimate goal is to analyze the coverage and capacity achieved with heterogeneous deployments and develop proposals to improvement the performance. A critical operational scenario for professional communications is the response in emergency situations. Wireless mesh networks appear as effective candidates to quickly self-configure a coverage area during the incident, supporting communications or providing access to the network infrastructure. In this scenario, the project's objectives are focused on defining efficient RRM mechanisms at link and network levels and designing MAC and routing protocols to support the deployment of wireless mesh networks, with particular emphasis on the ability of reconfiguration and adaptation to the environment.
LTE Infrastructure: Radio Transmission Efficiency and Bandwidth Management and Broadband Communications for Private Mobile Radio (PMR)
These projects belong to a set of technology transference projects funded by the company TELTRONIC S.A.U. whose overall goal is to design a complete wideband mobile communication system for...
These projects belong to a set of technology transference projects funded by the company TELTRONIC S.A.U. whose overall goal is to design a complete wideband mobile communication system for public security and emergency services based on LTE technology.
Improving The Power Efficiency For Reconfigurable Wireless Transceiver Using Linearization And Networks Of Impedance Synthesis (TEC2011-29126-C03-03)
This research project is focused on the proper integration of actions at device, analog/digital signal processing circuit, as well as system levels, as required to guarantee the desired high...
This research project is focused on the proper integration of actions at device, analog/digital signal processing circuit, as well as system levels, as required to guarantee the desired high functionality of these applications with an intelligent use of the available power resources.
 
From the transmitter efficiency point of view, the capability for designing reconfigurable power amplifiers has been stressed, not only by means of reconfigurable impedance tuning units for different standards as simple matching networks, but also as transistor quiescent point regulators (static and/or dynamic envelope trackers), which set properly the load line by analyzing the operation mode or the statistics of the standard, keeping always in mind the solution to the linearity versus power efficiency tradeoff. The challenge consists in providing a smart system that performs tracking and matching from the hardware and software points of view depending on the environment or a time-varying operative mode.

Key Technologies

Information and Communication Technologies

Wireless technologies (LTE, 3G, TETRA, ….): transceiver design, physical level techniques, radio resource management strategies
Wireless networks: Design and planning
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