- Position: Associate Professor
- Email: jaume.ramis@uib.es
- Research Area: Communications and Networking
- Google Scholar profile
Biography
Jaume Ramis Bibiloni was born in Sencelles, Spain, in 1972. He received the Engineer of Telecommunication degree from the Polytechnic University of Catalonia (UPC) in 1997.
Since 2002 he has held several positions at the Department of Mathematics and Informatics of the University of the Balearic Islands (UIB) and at this moment he is an Assistant Professor of this Department where he is pursuing his PhD degree.
His current research interests are wireless personal communication systems, with particular emphasis on third generation systems and beyond. He is author of articles in international journals on this topic as well as of communications to international conferences. He is collaborating on projects concerned with Wireless LAN (WLAN) funded by the Spanish andBalearic Islands governments.
Projects
- TERESA: Caracterización estadística, abstracción de capa física (PHY) y gestión de recursos radio en redes ultradensas
- ELISA: Asignación avanzada de recursos radio para el acceso compartido a redes con licencia y sin licencia.
- AM3DIO: Adaptive Multicarrier-Multiantenna-Multiuser networks based on Distributed inference and Optimisation
- COSMOS: Cross-layer optimisation schemes in MIMO/OFDMA systems
- GESLOTEL: Wireless positioning for the tourism industry
- XISPES: High-performance wireless networks for the health environment
Theses
Publications
2017
Ramis, J.; Carrasco-Martorell, L.
An Energy-Efficient and Delay-Constrained Resource Allocation Scheme for Periodical Monitoring Traffic in SmartBANs Conference
IEEE Biomedical Circuits and Systems Conference (BioCAS), Turin (Italy), 2017.
@conference{Ramis2017,
title = {An Energy-Efficient and Delay-Constrained Resource Allocation Scheme for Periodical Monitoring Traffic in SmartBANs},
author = {J. Ramis and L. Carrasco-Martorell},
year = {2017},
date = {2017-10-15},
booktitle = {IEEE Biomedical Circuits and Systems Conference (BioCAS)},
address = {Turin (Italy)},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
2013
Ramis, Jaume; Femenias, Guillem
Cross-Layer QoS-Constrained Optimization of Adaptive Multi-Rate Wireless Systems using Infrastructure-Based Cooperative ARQ Journal Article
In: IEEE Transactions on Wireless Communications, vol. 12, no. 5, pp. 2424-2435, 2013.
@article{Ramis13,
title = {Cross-Layer QoS-Constrained Optimization of Adaptive Multi-Rate Wireless Systems using Infrastructure-Based Cooperative ARQ},
author = {Jaume Ramis and Guillem Femenias},
year = {2013},
date = {2013-05-01},
journal = {IEEE Transactions on Wireless Communications},
volume = {12},
number = {5},
pages = {2424-2435},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2012
Ramis, Jaume; Femenias, Guillem
Cross-layer modeling of wireless systems using AMC with Cooperative-ARQ error control Conference
Poznan, Polonia, 2012.
@conference{2012_ramis_modeling,
title = {Cross-layer modeling of wireless systems using AMC with Cooperative-ARQ error control},
author = {Jaume Ramis and Guillem Femenias},
editor = {18th European Wireless Conference (EW)},
year = {2012},
date = {2012-01-01},
address = {Poznan, Polonia},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Ramis, Jaume; Femenias, Guillem
Cross-layer design, analysis and optimization of QoS-constrained AMC/ARQ-based wireless networks Book Chapter
In: Rashvand, H.; Kavian, Y (Ed.): Chapter 17, pp. 400-431, 2012.
@inbook{2012_ramis_book_17,
title = {Cross-layer design, analysis and optimization of QoS-constrained AMC/ARQ-based wireless networks},
author = {Jaume Ramis and Guillem Femenias},
editor = {H. Rashvand and Y Kavian},
year = {2012},
date = {2012-01-01},
pages = {400-431},
chapter = {17},
series = {Using Cross-Layer Techniques for Communication Systems},
keywords = {},
pubstate = {published},
tppubtype = {inbook}
}
2011
Ramis, Jaume; Femenias, Guillem; Carrasco, Loren
Cross-layer modeling of AMC/ARQ-based wireless networks with outdated CSI Conference
IEEE International Symposium on Wireless Communication Systems (ISWCS), Aachen, Germany, 2011.
@conference{2011-ramis-ISWCS,
title = {Cross-layer modeling of AMC/ARQ-based wireless networks with outdated CSI},
author = {Jaume Ramis and Guillem Femenias and Loren Carrasco},
year = {2011},
date = {2011-11-01},
booktitle = {IEEE International Symposium on Wireless Communication Systems (ISWCS)},
address = {Aachen, Germany},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Carrasco, Loren; Femenias, Guillem; Ramis, Jaume
Cross-layer optimization of AMC/ARQ-based wireless networks with channel-aware multiuser scheduling protocols Conference
Jornadas de Ingeniería Telemática (JITEL), Santander (Spain), 2011.
@conference{Carrasco11JITEL,
title = {Cross-layer optimization of AMC/ARQ-based wireless networks with channel-aware multiuser scheduling protocols},
author = {Loren Carrasco and Guillem Femenias and Jaume Ramis},
year = {2011},
date = {2011-09-01},
booktitle = {Jornadas de Ingenier\'{i}a Telem\'{a}tica (JITEL)},
address = {Santander (Spain)},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Carrasco, Loren; Ramis, Jaume; n, Borja Da; Martorell, Gabriel; Femenias, Guillem; Riera-Palou, Felip
Dise~no de una metodología docente y material de ayuda para el Trabajo Final de Grado Conference
Jornadas de Innovación Educativa en Ingeniería Telemática (JIE), Santander (Spain), 2011.
@conference{Carrasco11JIE,
title = {Dise~no de una metodolog\'{i}a docente y material de ayuda para el Trabajo Final de Grado},
author = {Loren Carrasco and Jaume Ramis and Borja Da ~n and Gabriel Martorell and Guillem Femenias and Felip Riera-Palou},
year = {2011},
date = {2011-09-01},
booktitle = {Jornadas de Innovaci\'{o}n Educativa en Ingenier\'{i}a Telem\'{a}tica (JIE)},
address = {Santander (Spain)},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Ramis, Jaume; Femenias, Guillem
Cross-Layer Design of Adaptive Multirate Wireless Networks Using Truncated HARQ Journal Article
In: IEEE Transactions on Vehicular Technology, vol. 60, no. 3, pp. 944 -954, 2011.
@article{Ramis2011,
title = {Cross-Layer Design of Adaptive Multirate Wireless Networks Using Truncated HARQ},
author = {Jaume Ramis and Guillem Femenias},
year = {2011},
date = {2011-03-01},
journal = {IEEE Transactions on Vehicular Technology},
volume = {60},
number = {3},
pages = {944 -954},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Carrasco, Loren; Femenias, Guillem; Ramis, Jaume
Cross layer design of multirate/multiuser wireless networks with channel-aware scheduling Conference
IEEE International Symposium on Wireless Communication Systems (ISWCS), Nov Aachen, Germany, 2011.
@conference{2011-carrasco-ISWCS,
title = {Cross layer design of multirate/multiuser wireless networks with channel-aware scheduling},
author = {Loren Carrasco and Guillem Femenias and Jaume Ramis},
year = {2011},
date = {2011-01-01},
booktitle = {IEEE International Symposium on Wireless Communication Systems (ISWCS)},
publisher = {Aachen, Germany},
organization = {Nov},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
2010
Ramis, Jaume; Femenias, Guillem; Riera-Palou, Felip; Carrasco, Loren
Throughput optimization in QoS constrained adaptive wireless networks using Chase Combining HARQ Conference
JITEL 2010, vol. IX Jornadas, Valladolid, SPAIN, 2010.
@conference{2010jitel_jaume,
title = {Throughput optimization in QoS constrained adaptive wireless networks using Chase Combining HARQ},
author = {Jaume Ramis and Guillem Femenias and Felip Riera-Palou and Loren Carrasco},
editor = {Yannis Dimitriadis and Mar\'{i}a Jes{'u}s Verd{'u}-P \'{e}},
year = {2010},
date = {2010-01-01},
booktitle = {JITEL 2010},
volume = {IX Jornadas},
address = {Valladolid, SPAIN},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Ramis, Jaume; Femenias, Guillem; Riera-Palou, Felip; Carrasco, Loren
Cross-layer optimization of adaptive multi-rate wireless networks using truncated Chase combining HARQ Conference
IEEE GLOBECOM, Miami, USA, 2010.
@conference{2010globecom,
title = {Cross-layer optimization of adaptive multi-rate wireless networks using truncated Chase combining HARQ},
author = {Jaume Ramis and Guillem Femenias and Felip Riera-Palou and Loren Carrasco},
year = {2010},
date = {2010-01-01},
booktitle = {IEEE GLOBECOM},
address = {Miami, USA},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
2009
Carrasco, Loren; Ramis, Jaume; Femenias, Guillem
Multidimensional Markov Model for the Cross-Layer Design of Multirate Wireless Systems using the Effective Capacity Function Conference
Vehicular Technology Conference, 2009. VTC Spring 2009. IEEE 69th, IEEE 2009.
@conference{VTC09,
title = {Multidimensional Markov Model for the Cross-Layer Design of Multirate Wireless Systems using the Effective Capacity Function},
author = {Loren Carrasco and Jaume Ramis and Guillem Femenias},
year = {2009},
date = {2009-01-01},
booktitle = {Vehicular Technology Conference, 2009. VTC Spring 2009. IEEE 69th},
pages = {1-5},
organization = {IEEE},
abstract = {In this paper, a novel framework for the cross-layer design of wireless networks combining adaptive modulation and coding (AMC) at the physical layer with an automatic repeat request (ARQ) protocol at
the data-link layer is proposed. In order to achieve this goal, the physical-layer service process is first modeled as a multidimensional finite-state Markov chain. Then, based on this multidimensional Markov model, the QoS performance at the data-link layer is characterized using the effective capacity approach. Queueing analysis using this effective capacity function is finally used in a cross-layer design approach aiming to satisfy the required average packet loss probability constraint by maximizing the average throughput of the system. Numerical examples are provided to show the advantages of our approach compared to other approaches using first-order amplitude-based finite state Markov models.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
In this paper, a novel framework for the cross-layer design of wireless networks combining adaptive modulation and coding (AMC) at the physical layer with an automatic repeat request (ARQ) protocol at
the data-link layer is proposed. In order to achieve this goal, the physical-layer service process is first modeled as a multidimensional finite-state Markov chain. Then, based on this multidimensional Markov model, the QoS performance at the data-link layer is characterized using the effective capacity approach. Queueing analysis using this effective capacity function is finally used in a cross-layer design approach aiming to satisfy the required average packet loss probability constraint by maximizing the average throughput of the system. Numerical examples are provided to show the advantages of our approach compared to other approaches using first-order amplitude-based finite state Markov models.
Ramis, Jaume; Femenias, Guillem; Carrasco, Loren
Cross-layer design of multi-rate wireless networks based on link layer truncated ARQ Conference
IEEE International Workshop on Cross-Layer Design (IWCLD), vol. 2009, 2009.
@conference{IWCLD-2009,
title = {Cross-layer design of multi-rate wireless networks based on link layer truncated ARQ},
author = {Jaume Ramis and Guillem Femenias and Loren Carrasco},
year = {2009},
date = {2009-01-01},
booktitle = {IEEE International Workshop on Cross-Layer Design (IWCLD)},
volume = {2009},
abstract = {A Markov chain-based queueing model is developed for a cross-layer performance analysis of a wireless network based on adaptive modulation and coding (AMC) at the physical layer and truncated automatic repeat request (ARQ) error control at the data link layer. This model generalizes previous results by using a first-order two-dimensional Markov chain to model the wireless fading channel. Furthermore, it allows each frame at the physical layer to contain an arbitrary number of packets from the data link layer and still ensuring that, concerning the acknowledged packets, the transmit buffer operates in first-in first-out (FIFO) mode. Analytical expressions for performance metrics such as throughput, average packet delay and packet loss rate, both due to buffer overflow and due to exceeding the maximum number of allowed retransmissions, are derived. These expressions are then used to formulate a constrained optimization problem to maximize the system throughput under the
prescribed QoS constraints.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
A Markov chain-based queueing model is developed for a cross-layer performance analysis of a wireless network based on adaptive modulation and coding (AMC) at the physical layer and truncated automatic repeat request (ARQ) error control at the data link layer. This model generalizes previous results by using a first-order two-dimensional Markov chain to model the wireless fading channel. Furthermore, it allows each frame at the physical layer to contain an arbitrary number of packets from the data link layer and still ensuring that, concerning the acknowledged packets, the transmit buffer operates in first-in first-out (FIFO) mode. Analytical expressions for performance metrics such as throughput, average packet delay and packet loss rate, both due to buffer overflow and due to exceeding the maximum number of allowed retransmissions, are derived. These expressions are then used to formulate a constrained optimization problem to maximize the system throughput under the
prescribed QoS constraints.
Femenias, Guillem; Ramis, Jaume; Carrasco, Loren
Using Two-Dimensional Markov Models and the Effective Capacity Approach for Cross-Layer Design in AMC/ARQ-Based Wireless Networks Journal Article
In: IEEE Transactions on Vehicular Technology, 2009.
@article{TVT-2009,
title = {Using Two-Dimensional Markov Models and the Effective Capacity Approach for Cross-Layer Design in AMC/ARQ-Based Wireless Networks},
author = {Guillem Femenias and Jaume Ramis and Loren Carrasco},
year = {2009},
date = {2009-01-01},
journal = {IEEE Transactions on Vehicular Technology},
abstract = {This paper proposes a novel framework for the cross-layer analysis and design of wireless networks combining adaptive modulation and coding (AMC) at the physical layer with an automatic repeat request (ARQ) protocol at the data-link layer. Most of previous works rely on first-order amplitude-based finite-state Markov chains (AFSMC) to model the physical layer. It is shown that these models present several deficiencies that could compromise the design of higher-layer protocols. Thus, a physical layer first-order two-dimensional Markov model using both the amplitude and the rate-of-change of the fading envelope is presented. Based on this multidimensional physical layer Markov model, the QoS performance at the data-link layer is investigated through the use of two different approaches. The first one relies on an analytical framework based on a discrete time Markov chain (DTMC) that jointly describes the statistical behaviour of the arrival process, the queueing system and the physical layer. The second one is based on the effective bandwidth and effective capacity theories. Both the DTMC-based and the effective bandwidth/capacity-based approaches are analyzed and compared in combination with our proposed physical layer first-order two-dimensional Markov model in a cross-layer design aiming to satisfy the required average packet loss probability constraint by maximizing the average throughput of the system. Numerical results show that our proposed framework represents a significant improvement over previous models.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This paper proposes a novel framework for the cross-layer analysis and design of wireless networks combining adaptive modulation and coding (AMC) at the physical layer with an automatic repeat request (ARQ) protocol at the data-link layer. Most of previous works rely on first-order amplitude-based finite-state Markov chains (AFSMC) to model the physical layer. It is shown that these models present several deficiencies that could compromise the design of higher-layer protocols. Thus, a physical layer first-order two-dimensional Markov model using both the amplitude and the rate-of-change of the fading envelope is presented. Based on this multidimensional physical layer Markov model, the QoS performance at the data-link layer is investigated through the use of two different approaches. The first one relies on an analytical framework based on a discrete time Markov chain (DTMC) that jointly describes the statistical behaviour of the arrival process, the queueing system and the physical layer. The second one is based on the effective bandwidth and effective capacity theories. Both the DTMC-based and the effective bandwidth/capacity-based approaches are analyzed and compared in combination with our proposed physical layer first-order two-dimensional Markov model in a cross-layer design aiming to satisfy the required average packet loss probability constraint by maximizing the average throughput of the system. Numerical results show that our proposed framework represents a significant improvement over previous models.
Ramis, Jaume; Carrasco, Loren; Femenias, Guillem
Dise~no intercapas en redes inalámbricas basadas en AMC y ARQ truncado Conference
JITEL 2009, vol. VIII Jornadas, Cartagena, Spain, 2009.
@conference{2009jitel_jaume,
title = {Dise~no intercapas en redes inal\'{a}mbricas basadas en AMC y ARQ truncado},
author = {Jaume Ramis and Loren Carrasco and Guillem Femenias},
year = {2009},
date = {2009-01-01},
booktitle = {JITEL 2009},
volume = {VIII Jornadas},
pages = {260-267},
address = {Cartagena, Spain},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
2008
Riera-Palou, Felip; Femenias, Guillem; Ramis, Jaume
On the design of uplink and downlink group-orthogonal multicarrier systems Journal Article
In: Communications, IEEE Transactions on, vol. 56, no. 10, pp. 1656-1665, 2008.
@article{GRECTPAR-530482,
title = {On the design of uplink and downlink group-orthogonal multicarrier systems},
author = {Felip Riera-Palou and Guillem Femenias and Jaume Ramis},
year = {2008},
date = {2008-01-01},
journal = {Communications, IEEE Transactions on},
volume = {56},
number = {10},
pages = {1656-1665},
abstract = {Group-orthogonal multicarrier code-division multiple access (GO-MC-CDMA) has been proposed as an attractive multiplexing technique for the uplink segment of wireless systems. More recently, a variant of this scheme has also been proposed for the downlink. This paper presents a unified bit error rate (BER) performance analysis of group-orthogonal wireless systems when using maximum likelihood (ML) multiuser/multisymbol detection covering both link directions. Valuable design rules regarding the number of subcarriers per group and the selection of spreading codes are derived. Simulations results using realistic system parameters and ETSI BRAN channel models are also presented which serve to validate the analytical results.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Group-orthogonal multicarrier code-division multiple access (GO-MC-CDMA) has been proposed as an attractive multiplexing technique for the uplink segment of wireless systems. More recently, a variant of this scheme has also been proposed for the downlink. This paper presents a unified bit error rate (BER) performance analysis of group-orthogonal wireless systems when using maximum likelihood (ML) multiuser/multisymbol detection covering both link directions. Valuable design rules regarding the number of subcarriers per group and the selection of spreading codes are derived. Simulations results using realistic system parameters and ETSI BRAN channel models are also presented which serve to validate the analytical results.
Ramis, Jaume; Carrasco, Loren; Femenias, Guillem
A two-dimensional Markov model for cross-layer design in AMC/ARQ-based wireless networks Conference
Global Telecommunications Conference, 2008. IEEE GLOBECOM 2008. IEEE, 2008.
@conference{GRECTPPR-042132,
title = {A two-dimensional Markov model for cross-layer design in AMC/ARQ-based wireless networks},
author = {Jaume Ramis and Loren Carrasco and Guillem Femenias},
year = {2008},
date = {2008-01-01},
booktitle = {Global Telecommunications Conference, 2008. IEEE GLOBECOM 2008. IEEE},
pages = {4637-4642},
abstract = {Nowadays, there are lots of research efforts focusing on cross-layer designs combining adaptive modulation and coding (AMC) with an automatic repeat request (ARQ) protocol. One of the main drawbacks of these research works is that they rely on first-order amplitude-based finite-state Markov chains (AFSMC) to model the wireless fading channel. Furthermore, most of the analytical models used in these works present several deficiencies that could compromise the design of cross-layer protocols. To overcome the aforementioned problems, in this paper we propose a novel cross-layer analytical framework that is based on both the use of a first-order two-dimensional Markov model and a judicious implementation of the AMC threshold searching algorithm used in the transmission mode (TM) selection. This threshold search is designed independently from the channel model and is able to discriminate between useful and useless TMs. To exploit the joint impact on QoS performance measures of both AMC and ARQ we present a formulation of an AMC/ARQ cross-layer design as a constrained optimization problem.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Nowadays, there are lots of research efforts focusing on cross-layer designs combining adaptive modulation and coding (AMC) with an automatic repeat request (ARQ) protocol. One of the main drawbacks of these research works is that they rely on first-order amplitude-based finite-state Markov chains (AFSMC) to model the wireless fading channel. Furthermore, most of the analytical models used in these works present several deficiencies that could compromise the design of cross-layer protocols. To overcome the aforementioned problems, in this paper we propose a novel cross-layer analytical framework that is based on both the use of a first-order two-dimensional Markov model and a judicious implementation of the AMC threshold searching algorithm used in the transmission mode (TM) selection. This threshold search is designed independently from the channel model and is able to discriminate between useful and useless TMs. To exploit the joint impact on QoS performance measures of both AMC and ARQ we present a formulation of an AMC/ARQ cross-layer design as a constrained optimization problem.
Ramis, Jaume; Carrasco, Loren; Femenias, Guillem
Cross-layer design of multi-rate wireless systems using AMC with ARQ-based error control. A two dimensional Markov model approach Conference
JITEL 2008, Alcalá de Henares, 2008.
@conference{GRECTPPR-042302,
title = {Cross-layer design of multi-rate wireless systems using AMC with ARQ-based error control. A two dimensional Markov model approach},
author = {Jaume Ramis and Loren Carrasco and Guillem Femenias},
editor = {Iv\'{a}n Mars \'{a} and Guillermo Ib\'{a}{~n}ez-Fern \'{a} and Juan Velasco-P R \'{e}},
year = {2008},
date = {2008-01-01},
booktitle = {JITEL 2008},
pages = {1-8},
address = {Alcal\'{a} de Henares},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
2007
Riera-Palou, Felip; Femenias, Guillem; Ramis, Jaume
Performance analysis of multiuser detectors for uplink quasi-synchronous MC-CDMA systems Journal Article
In: Wireless Personal Communications, vol. 43, pp. 1511-1521, 2007.
@article{GRECTPAR-530403,
title = {Performance analysis of multiuser detectors for uplink quasi-synchronous MC-CDMA systems},
author = {Felip Riera-Palou and Guillem Femenias and Jaume Ramis},
year = {2007},
date = {2007-01-01},
journal = {Wireless Personal Communications},
volume = {43},
pages = {1511-1521},
abstract = {This paper analyses and compares the average bit error rate (BER) of different multiuser detectors (MUD) in the uplink of a multicarrier codedivision multiple access (MC-CDMA) system. In particular, maximum likelihood, zero-forcing, minimum mean-square error and interference cancellation-based multiuser detectors have been analysed for the special case of uncorrelated subcarriers. The derived BER expressions are based upon previous results on diversity combining and also on recent findings on multiple input multiple output (MIMO) architectures. The subcarrier correlation is considered in the context of physical parameters currently under discussion for future wireless systems to give an indication up to what extent the assumption of uncorrelated subcarrier fading is plausible.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This paper analyses and compares the average bit error rate (BER) of different multiuser detectors (MUD) in the uplink of a multicarrier codedivision multiple access (MC-CDMA) system. In particular, maximum likelihood, zero-forcing, minimum mean-square error and interference cancellation-based multiuser detectors have been analysed for the special case of uncorrelated subcarriers. The derived BER expressions are based upon previous results on diversity combining and also on recent findings on multiple input multiple output (MIMO) architectures. The subcarrier correlation is considered in the context of physical parameters currently under discussion for future wireless systems to give an indication up to what extent the assumption of uncorrelated subcarrier fading is plausible.
Riera-Palou, Felip; Femenias, Guillem; Ramis, Jaume
BER Analysis of Group-orthogonal code division multiplex systems Journal Article
In: Telecommunication Systems, vol. 36, pp. 97-105, 2007.
@article{GRECTPAR-530481,
title = {BER Analysis of Group-orthogonal code division multiplex systems},
author = {Felip Riera-Palou and Guillem Femenias and Jaume Ramis},
year = {2007},
date = {2007-01-01},
journal = {Telecommunication Systems},
volume = {36},
pages = {97-105},
abstract = {Group-orthogonal multi-carrier code division multiple access (GO-MC-CDMA) has recently been proposed as a promising technique for the uplink segment of wireless systems. In this paper we propose and analyze a related scheme, group-orthogonal multi-carrier code division multiplexing (GO-MC-CDM), suitable for the downlink segment of the future generation of wireless systems. The proposed system is shown to offer a similar bit error rate (BER) performance as the downlink version of GOMC- CDMA at a fraction of its computational complexity. An analytical expression for the BER when using maximum likelihood (ML) detection is derived providing valuable insight into the parameters affecting the system performance and providing a basis for its optimization. Simulation results using parameters and (correlated) channel models aiming at the next generation of wireless systems are provided confirming the analytically derived results.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Group-orthogonal multi-carrier code division multiple access (GO-MC-CDMA) has recently been proposed as a promising technique for the uplink segment of wireless systems. In this paper we propose and analyze a related scheme, group-orthogonal multi-carrier code division multiplexing (GO-MC-CDM), suitable for the downlink segment of the future generation of wireless systems. The proposed system is shown to offer a similar bit error rate (BER) performance as the downlink version of GOMC- CDMA at a fraction of its computational complexity. An analytical expression for the BER when using maximum likelihood (ML) detection is derived providing valuable insight into the parameters affecting the system performance and providing a basis for its optimization. Simulation results using parameters and (correlated) channel models aiming at the next generation of wireless systems are provided confirming the analytically derived results.
Femenias, Guillem; Riera-Palou, Felip; Ramis, Jaume
General Analysis of Uplink Group-Orthogonal MC-CDMA Systems Conference
IEEE Vehicular Technology Conference 2007 Spring, 2007.
@conference{GRECTPPR-037516,
title = {General Analysis of Uplink Group-Orthogonal MC-CDMA Systems},
author = {Guillem Femenias and Felip Riera-Palou and Jaume Ramis},
year = {2007},
date = {2007-01-01},
booktitle = {IEEE Vehicular Technology Conference 2007 Spring},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Ramis, Jaume; Carrasco, Loren; Femenias, Guillem; Riera-Palou, Felip
Scheduling algorithms for 4G wireless networks Conference
IFIP Personal Wireless Communications (PWC 2007), vol. 245, 2007.
@conference{GRECTPPR-037519,
title = {Scheduling algorithms for 4G wireless networks},
author = {Jaume Ramis and Loren Carrasco and Guillem Femenias and Felip Riera-Palou},
editor = {B Simak and R Bestak and E Kozowska},
year = {2007},
date = {2007-01-01},
booktitle = {IFIP Personal Wireless Communications (PWC 2007)},
volume = {245},
pages = {264-276},
abstract = {Scheduling algorithms are fundamental components in the process of resource management in mobile communication networks with heterogeneous QoS requirements such as delay, delay jitter, packet loss rate or throughput. The random characteristics of the propagation environment and the use of complex physical layers in order to combat this random behavior further complicates the design of simple, efficient, scalable and fair scheduling algorithms. This paper presents the main criteria used in the design of scheduling algorithms for 3G/4G mobile communications networks and provides a survey of scheduling mechanisms proposed for use in TDMA and CDMA based systems.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Scheduling algorithms are fundamental components in the process of resource management in mobile communication networks with heterogeneous QoS requirements such as delay, delay jitter, packet loss rate or throughput. The random characteristics of the propagation environment and the use of complex physical layers in order to combat this random behavior further complicates the design of simple, efficient, scalable and fair scheduling algorithms. This paper presents the main criteria used in the design of scheduling algorithms for 3G/4G mobile communications networks and provides a survey of scheduling mechanisms proposed for use in TDMA and CDMA based systems.
Ramis, Jaume; Carrasco, Loren; Femenias, Guillem; Riera-Palou, Felip
Scheduling for 4G systems Conference
IFIP Personal Wireless Communications (PWC) 2007, 2007.
@conference{GRECTPPR-038035,
title = {Scheduling for 4G systems},
author = {Jaume Ramis and Loren Carrasco and Guillem Femenias and Felip Riera-Palou},
year = {2007},
date = {2007-01-01},
booktitle = {IFIP Personal Wireless Communications (PWC) 2007},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Ramis, Jaume; Carrasco, Loren; Femenias, Guillem; Riera-Palou, Felip
Simulación dinámica para la evaluación y optimización de los algoritmos de gestión de recursos radio Conference
VI Jornadas de Ingeniería Telemática (JITEL 2007), 2007.
@conference{GRECTPPR-038048,
title = {Simulaci\'{o}n din\'{a}mica para la evaluaci\'{o}n y optimizaci\'{o}n de los algoritmos de gesti\'{o}n de recursos radio},
author = {Jaume Ramis and Loren Carrasco and Guillem Femenias and Felip Riera-Palou},
year = {2007},
date = {2007-01-01},
booktitle = {VI Jornadas de Ingenier\'{i}a Telem\'{a}tica (JITEL 2007)},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
2006
Carrasco, Loren; Ramis, Jaume; Femenias, Guillem
Reverse link average ber of DS-CDMA system with fast and slow power controlled users Journal Article
In: Electronics Letters, vol. 42, pp. 481-483, 2006.
@article{GRECTPAR-527295,
title = {Reverse link average ber of DS-CDMA system with fast and slow power controlled users},
author = {Loren Carrasco and Jaume Ramis and Guillem Femenias},
year = {2006},
date = {2006-01-01},
journal = {Electronics Letters},
volume = {42},
pages = {481-483},
abstract = {Analytical expressions for the average bit error rate in the reverse link of a DS-CDMA system with coexisting fast and slow power controlled users are presented. The combined effects of a frequency selective Nakagami fading channel with an arbitrary multipath intensity profile, the power control error and the use of a cell selection process based on a minimum attenuation criterion are considered.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Analytical expressions for the average bit error rate in the reverse link of a DS-CDMA system with coexisting fast and slow power controlled users are presented. The combined effects of a frequency selective Nakagami fading channel with an arbitrary multipath intensity profile, the power control error and the use of a cell selection process based on a minimum attenuation criterion are considered.
Riera-Palou, Felip; Femenias, Guillem; Ramis, Jaume
Performance of downlink group-orthogonal multicarrier systems Journal Article
In: Lecture Notes in Computer Science, vol. 4217, pp. 389-400, 2006.
@article{GRECTPAR-528555,
title = {Performance of downlink group-orthogonal multicarrier systems},
author = {Felip Riera-Palou and Guillem Femenias and Jaume Ramis},
year = {2006},
date = {2006-01-01},
journal = {Lecture Notes in Computer Science},
volume = {4217},
pages = {389-400},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Riera-Palou, Felip; Femenias, Guillem; Ramis, Jaume
Performance of downlink group-orthogonal multicarrier systems Conference
IFIP Personal Wireless Communications, 2006.
@conference{GRECTPPR-034472,
title = {Performance of downlink group-orthogonal multicarrier systems},
author = {Felip Riera-Palou and Guillem Femenias and Jaume Ramis},
year = {2006},
date = {2006-01-01},
booktitle = {IFIP Personal Wireless Communications},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Ramis, Jaume; Carrasco, Loren; Femenias, Guillem; Riera-Palou, Felip
Algoritmos de planificación de recursos para redes inalámbricas 4G Conference
XVI JORNADAS TELECOM I+D 2006, 2006.
@conference{GRECTPPR-036637,
title = {Algoritmos de planificaci\'{o}n de recursos para redes inal\'{a}mbricas 4G},
author = {Jaume Ramis and Loren Carrasco and Guillem Femenias and Felip Riera-Palou},
year = {2006},
date = {2006-01-01},
booktitle = {XVI JORNADAS TELECOM I+D 2006},
abstract = {Los algoritmos de planificaci\'{o}n son los componentes fundamentales en el proceso de asignaci\'{o}n de recursos para conseguir el cumplimiento de los requisitos de calidad de servicio. Cuando el dise~no corresponde a redes inal\'{a}mbricas \'{e}ste se complica considerablemente debido a las caracter\'{i}sticas del canal radio: interferencias, desvanecimientos, variaciones de la capacidad, etc. Es por ello que no resulta una tarea f\'{a}cil conseguir una planificaci\'{o}n eficiente y equitativa de los recursos en este tipo de redes. En este art\'{i}culo se describen los criterios de planificaci\'{o}n en redes inal\'{a}mbricas de cuarta generaci\'{o}n y se lleva a cabo una extensa revisi\'{o}n de los mecanismos de planificaci\'{o}n propuestos para las redes TDMA y CDMA.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Los algoritmos de planificación son los componentes fundamentales en el proceso de asignación de recursos para conseguir el cumplimiento de los requisitos de calidad de servicio. Cuando el dise~no corresponde a redes inalámbricas éste se complica considerablemente debido a las características del canal radio: interferencias, desvanecimientos, variaciones de la capacidad, etc. Es por ello que no resulta una tarea fácil conseguir una planificación eficiente y equitativa de los recursos en este tipo de redes. En este artículo se describen los criterios de planificación en redes inalámbricas de cuarta generación y se lleva a cabo una extensa revisión de los mecanismos de planificación propuestos para las redes TDMA y CDMA.
1998
Puente, C.; Romeu, J.; Pous, R.; Ramis, J.; Hijazo, A.
Small but long Koch fractal monopole Journal Article
In: IEE Electronics Letters, vol. 34, no. 1, pp. 9-10, 1998.
@article{Ramis98,
title = {Small but long Koch fractal monopole},
author = {C. Puente and J. Romeu and R. Pous and J. Ramis and A. Hijazo},
year = {1998},
date = {1998-01-08},
journal = {IEE Electronics Letters},
volume = {34},
number = {1},
pages = {9-10},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
