Papers by Jonathan Rodriguez
The Practical Reality, 2015
This chapter describes outdoor transmission tests and field measurements in TV white spaces (TVWS... more This chapter describes outdoor transmission tests and field measurements in TV white spaces (TVWS) carried out in Europe. TVWS Measurements in Germany showed that the extended Hata model is appropriate to describe the path loss over distances up to a few kilometers. During the TVWS trial in Slovenia, we combine infrastructure sensing with geo-location database access to protect not only DVB-T, but also wireless microphone (WM) signals from TVWS devices interference.
Signals and Communication Technology, 2014
The use of general descriptive names, registered names, trademarks, service marks, etc. in this p... more The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein.
Smart Device to Smart Device Communication, 2014
Analysts predict an explosive growth in traffic demand on mobile broadband systems over the comin... more Analysts predict an explosive growth in traffic demand on mobile broadband systems over the coming years due to the popularity of streaming video, gaming, and other social media services. While 4G wireless technologies are making a significant effort to keep up with this demand, the expectation is that cellular deployments will fall short of the required capacity unless there is a dramatic shift towards smaller cells. There is already significant interest in Femto and picocells deployments for this reason. However, there is another method of increasing the spatial spectrum reuse that the wireless industry has yet to capitalize on, namely direct connectivity between clients in close proximity. A key motivation for D2D connectivity is its potential for operators to offload traffic from the core network, and the framework for a new communication paradigm to support social networking through localization. The current ad hoc mode communication does not support this well due to its configuration complexity.
Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, 2009
Mobile communications has witnessed an exponential increase in the amount of users, services and ... more Mobile communications has witnessed an exponential increase in the amount of users, services and applications. While 2G cellular networks were mainly optimized to support voice services, effective delivery of broadband multimedia applications will drive the requirements for Next Generation Networks (NGNs). WiMAX targets to provide broadband connectivity to wide area coverage, and thus introduces significant design challenges in the MAC (Medium access Control) to provide the seamless transport of heterogeneous traffic in a cost-effective manner. This paper proposes a Dynamic Resource Allocation (DRA) strategy that can provide operators the flexibility to deliver broadband traffic with high spectral efficiency. The DRA unit constitutes a scheduler, Link Adaptation (LA), Resources Allocation (RA) and Hybrid Automated Repeat Request (HARQ) components inter-working seamlessly. The potential for the DRA to deliver QoS is achieved through service classification lists, where higher priority is given towards retransmitted packets, and subsequently to first-time transmitters with packet delay. The simulation results show that the proposed DRA scheme has the capacity to provide enhanced coverage for NRTV (Near Real Time Video) services in wide area networks (WANs)
Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, 2010
Next generation networks consider context information to deliver personalized services, where thi... more Next generation networks consider context information to deliver personalized services, where this context can include positioning information. On the other side, positioning information is relevant to some of the network main functions: geographical routing, network coverage, enhanced security, power saving etc. Therefore determining the position of nodes in wireless networks is pivotal and this paper proposes a cooperative iterative framework to expand the overall localization coverage in an ad hoc wireless network.
Proceedings - 6th International Conference on Wireless and Mobile Communications, ICWMC 2010, 2010
Location information is an important enabler for context aware applications required by next gene... more Location information is an important enabler for context aware applications required by next generation networks to provide personalized services. On the other side location knowledge is essential for some of the network main functions such as geographical routing, coverage management and power saving. Mobile devices containing a number of communication standards are able to exploit a heterogeneous infrastructure. This paper
2011 Wireless Advanced, WiAd 2011, 2011
Abstract In this paper a downlink location based adaptive beamforming algorithm (LBA) for OFDMA n... more Abstract In this paper a downlink location based adaptive beamforming algorithm (LBA) for OFDMA network is proposed. Conventional beamforming algorithms use SINR for determining the weights vector, whereas the proposed LBA profits from available ...
5th International Symposium on Communications Control and Signal Processing, ISCCSP 2012, 2012
Location information is widely used for cooperative techniques in the relays. In this paper we ex... more Location information is widely used for cooperative techniques in the relays. In this paper we extended our proposed location-based adaptive beamforming algorithm (LBA) with cooperative relay techniques (CLBA) which takes the profit from available positioning information, based on the cooperation and reduction of the convergence time of weights vector determination. The simulation results show that the proposed CLBA algorithm reacts
IEEE Vehicular Technology Conference, 2008
In beyond 3G systems, one of the important factors is to address Radio access technology (RAT) se... more In beyond 3G systems, one of the important factors is to address Radio access technology (RAT) selection and load balancing between heterogeneous networks to ensure high spectral efficiency in an era where spectral resources are at a premium. This work aims to address the feasibility of utilizing WiFi as complementary service for HSDPA, to prevent quality of service deterioration in the event of network overload in HSDPA during the busy period. The proposed RAT selection algorithm is based on the load of each system, and the results show that the outage probability can be improved by up to 45% relative to a stand-alone HSDPA system.
Proceedings of the 8th International Conference on Networks, ICN 2009, 2009
The application of mathematical analysis to the study of wireless ad hoc networks has met with li... more The application of mathematical analysis to the study of wireless ad hoc networks has met with limited success due to the complexity of mobility, traffic models and the dynamic topology. A scenario based UMTS TDD opportunistic cellular system with an ad hoc behaviour that operates over UMTS FDD licensed cellular network is considered. In this paper, we describe how ad hoc opportunistic radio can be modeled as a game and how we apply game theory based Power Control in ad-hoc opportunistic radio.
Proceedings of the 2009 6th International Symposium on Wireless Communication Systems, ISWCS'09, 2009
Abstract A new Packet Scheduler whose architecture is based on the cross-layer paradigm is propo... more Abstract A new Packet Scheduler whose architecture is based on the cross-layer paradigm is proposed for the IEEE 802.16e standard of Mobile WiMAX networks. The scheduler combines functionalities derived from the use of the utility function concept from economics, for the ...
IEEE International Conference on Communications, 2012
Abstract Energy is becoming a vital resource in wireless networks and with the introduction of hi... more Abstract Energy is becoming a vital resource in wireless networks and with the introduction of high data rate wireless technologies the future Wireless Personal Area Networks (WPANs) will be able to support demanding applications eg interactive games, video sharing etc. and as a result the energy saving mechanisms will become more demanding and challenging. The mobile devices with hybrid character, containing ad hoc and infrastructure access, will need mechanisms that keep them connected in an energy ...
IEEE Vehicular Technology Conference, 2011
Abstract Multi-standard mobile devices are allowing users to experience higher data rates and ubi... more Abstract Multi-standard mobile devices are allowing users to experience higher data rates and ubiquitous connectivity. These advances are achieved on the expense of higher energy consumption due to the multiple active wireless interfaces. In this paper, we use one advantage of the multiple interfaces, namely short range communications. Mobile terminals (MTs) form short range cooperative network to take advantage of the good channel quality of short range links to save energy of MTs. In this cooperative network, the energy of all MTs ...
2012 IEEE Globecom Workshops, 2012
ABSTRACT
Signals and Communication Technology, 2014
Legacy mobile handsets already incorporate multimode features, with dual, tri and quad band funct... more Legacy mobile handsets already incorporate multimode features, with dual, tri and quad band functionality already the norm, and the very latest smart phone having WiFi connectivity. However, complete interoperability is still in its infancy with several hurdles still to overcome, and energy efficiency is one of them. Unless mobile handsets are smart enough to be energy aware and flexible in switching between several standards, the 5G slogan of anytime, anywhere connectivity could remain a “vision” rather than close to market. To attain true energy efficiency lays down stringent design requirements on the RF system that in today’s handset is a key consumer of power. In fact the power amplifier is the main culprit for stealing energy from the battery supply, and the reason why mobile handset become hot after a lengthy call. This effect will multiply when ubiquitous broadband connectivity becomes the standard, leading to significant research on active cooling, considering approaches similar to fan techniques in laptop and desktop devices. However, rather than trying to reduce the effects of overheating, we aim to tackle the problem at the bud, by considering energy efficient designs. In fact, this chapter is the sequel to the former that was dedicated to the study of new designs for hardware components that can provide truly flexible and energy efficient multi-standard transceivers. This chapter completes this study by focusing on energy efficient power amplifier design. We consider three innovative designs, to operate at varying operating frequencies, covering the frequency bands 400 MHz, 1,920 MHz and 3.5 GHz. The proposed RF Power Amplifiers show considerable enhancements compared to the state-of-the-art existing technologies.
2010 9th International Symposium on Electronics and Telecommunications, 2010
Fourth generation systems require the use of both amplitude and phase modulation to efficiently u... more Fourth generation systems require the use of both amplitude and phase modulation to efficiently utilize the available spectrum and to obtain high data rates, hence imposing stringent requirements on the power amplifier in terms of efficiency and linearity and requires the power amplifier to operate linearly and efficiently. The B3G base station transceiver Doherty power amplifier was designed to operate over the frequency range of 3.47GHz to 3.53GHz mobile WiMAX band using Freescale's N-Channel Enhancement-Mode Lateral MOSFET Transistor, MRF7S38010HR3; The performances of the Doherty amplifier are compared with that of the conventional Class AB amplifier. The results of 43 dBm output power and 66% power added efficiency are achieved.
2012 International Conference on Telecommunications and Multimedia (TEMU), 2012
Abstract This paper describes the ROMEO architecture for live 3D multi-view video delivery over p... more Abstract This paper describes the ROMEO architecture for live 3D multi-view video delivery over peer-to-peer networks. The scope of the European founded Integration Project ROMEO encompasses addressing the challenges of live multiview video delivery over heterogeneous networks (WiFi, LTE, DVB, etc.) and diverse user equipment (mobile, portable, fixed). In order to achieve seamless uninterrupted 3D video delivery and to maximize the users' quality of experience, ROMEO proposes a variety of techniques and ...
For the characterization of TV White Spaces (TVWS), an extensive simulation of the impact of inte... more For the characterization of TV White Spaces (TVWS), an extensive simulation of the impact of interfering signals was undertaken in a generalized scenario. The simulation for these investigations was derived from a Monte Carlo methodology using SEAMCAT, and the results include the computation of TVWS maps as it can be done with the access to a geo-location database, or based on autonomous sensing only. Geo-location database approach is shown to utilize TVWS spectrum more efficiently. The impact of Professional Wireless Microphone Systems (PWMS) devices on the availability of TVWS is also analyzed and imposes additional limitations of the maximum power emitted by secondary spectrum users.
Mobile Networks and Applications, 2008
Mobile communications has witnessed an exponential increase in the amount of users, services and ... more Mobile communications has witnessed an exponential increase in the amount of users, services and applications. WiMAX (Worldwide Interoperability for Microwave Access) targets to provide broadband connectivity to wide area coverage, both in fixed and in mobile environments, as well as in the provision of QoS constraints of those applications and services envisioned for Next Generation Networks (NGNs), which results in significant design challenges in the MAC (Medium Access Control) to provide the seamless transport of heterogeneous traffic in a cost-effective manner. This paper proposes a Dynamic Resource Allocation (DRA) architecture for the IEEE802.16e broadband wireless system (also known as Mobile WiMAX) that can provide operators the flexibility to deliver broadband traffic with high spectral efficiency. The proposed DRA architecture framework encompasses scheduler, Link Adaptation (LA), Resource Allocation (RA) and Hybrid Automated Repeat Request (HARQ) functional blocks which interwork seamlessly. The performance of the DRA was evaluated using commonly deployed scheduling policies: Max C/I, Proportional Fair and Round Robin schemes. Simulation results show that the proposed DRA scheme has the capacity to provide enhanced coverage and QoS provisioning for the area networks (WANs), such as the ones envisioned for B3G mobile wireless networks.
Journal of Communications and Networks, 2009
The application of mathematical analysis to the study of wireless ad hoc networks has met with li... more The application of mathematical analysis to the study of wireless ad hoc networks has met with limited success due to the complexity of mobility, traffic models and the dynamic topology. A scenario based UMTS TDD opportunistic cellular system with an ad hoc behaviour that operates over UMTS FDD licensed cellular network is considered. In this paper, using an ah-hoc behavior
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Papers by Jonathan Rodriguez