J. Rius i Riu

J. Rius i Riu
Telenor Sweden · Performance Management

PhD

About

56
Publications
7,896
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
294
Citations
Citations since 2016
3 Research Items
63 Citations
2016201720182019202020212022051015
2016201720182019202020212022051015
2016201720182019202020212022051015
2016201720182019202020212022051015
Additional affiliations
November 2016 - present
Telenor Sweden
Position
  • Technical Architect Performance Management
October 2014 - October 2016
Ericsson Research
Position
  • Principal Investigator
February 1998 - October 2002
KTH Royal Institute of Technology
Position
  • PhD Student

Publications

Publications (56)
Article
The ever increasing service demands, flexibility needs, and business opportunities have led broadband operators to explore strategies for implementing access agnostic core networks. The hybrid access system is one such strategy that helps operators to deliver higher bandwidth and more reliable services to their subscribers. This article provides a...
Conference Paper
Fixed-Mobile Convergence (FMC) has been a trending topic in telecommunications during the last decade. Standard Development Organizations (SDOs) have addressed FMC in the context of different access and core networks, with special focus in the 3rd generation Partnership Project (3GPP) and in the Broadband Forum (BBF). This paper describes the stand...
Article
Full-text available
The rapid uptake of bandwidth-consuming services such as video on demand and linear TV has many service providers struggling to keep pace with ever increasing bandwidth demands. The problem is particularly acute on the last mile: the segment of the network that delivers broadband services to users’ homes and workplaces. As an alternative to buildin...
Article
This article describes a standardized architectural framework that enables network resources and policy control, and charging enforcement for both mobile and fixed networks. These capabilities together facilitate the realization of a unified control plane. The most relevant use cases supported by such a unified control plane are presented and descr...
Article
Full-text available
Digital subscriber lines (DSLs) technology is vastly used for high-speed data transmission. Crosstalk is one of the main problems in DSL. The research community has done extensive work on how to optimize spectrum allocation across DSL frequencies and mitigate crosstalk, a subject that has been called dynamic spectrum management (DSM). This text pre...
Article
Full-text available
The broadband capacity of the twisted-pair lines strongly varies within the copper access network. It is therefore important to assess the ability of a digital subscriber line (DSL) to support the DSL services prior to deployment. This task is handled by the line qualification procedures, where the identification of the line topology is an importan...
Patent
Full-text available
The present invention relates to method and arrangements for reducing crosstalk in a DSL system. This is achieved by providing the users in the network With a ghost line, i.e. a virtual line that should re?ect the damage to be caused to the remaining users in the network, and that each user allocates the PSDs such that the allocated PSD is optimize...
Conference Paper
Full-text available
This work presents an analysis based on an multimedia transmission generated on optical fiber backbone and two combined access technologies, PLC (Power Line Communications) and ADSL2+ (Asymmetric Digital Subscriber Line), called of pDSL. This paper points a case study of multimedia traffic using pDSL combination with intention to present measured a...
Conference Paper
Full-text available
Digital Subscriber Lines (DSL) are today one of the most important means for delivering high-speed data transmission. Dynamic Spectrum Management (DSM) is an emerging technique for dealing with crosstalk, one of the technology's most harmful problems. DSM judiciously designs users' power spectral densities so that the overall system performance is...
Conference Paper
Full-text available
This paper describes a Copper Plant Manager concept for DSL first mile, which effectively enables performance monitoring, fault interpretation and dynamic link management. This concept copes with the nature and complexity of the underlying DSL network and presents a unified solution for controlling and managing its resources. An implementation of t...
Conference Paper
Full-text available
Digital subscriber lines (DSL) are today one of the most important means for delivering high-speed data transmission. An emerging technique for dealing with one of the technology's most harmful problems, crosstalk, is dynamic spectrum management (DSM). DSM literature already counts with some half a dozen important solutions. These solutions can be...
Conference Paper
Full-text available
This paper describes Sequence Time Domain Reflectometry (STDR) and Spread Spectrum Time Domain Reflectometry (SSTDR), which utilizes concepts from direct sequence spread spectrum communications, as a technique for detecting impedance mismatches in telephone lines (twisted pair). The aim of this paper is to present methodologies for characterizing a...
Article
Full-text available
Many broadband services are based on multimedia applications, such as voice over internet protocol (VoIP), video conferencing, video on demand (VoD), and internet protocol television (IPTV). The combination "triple-play" is often used with IPTV. It simply means offering voice, video and data. IPTV and others services uses digital broadband networks...
Conference Paper
Full-text available
This paper aims to characterize how the impulse noise impacts on services and applications for a broadband system using an ADSL2+ (Asymmetric Digital Subscriber Line, extended bandwidth) loop. The first approach employs the impulse noise defined in the G.996.1 (Test Procedures for DSL Transceivers) and TR-048 (ADSL Interoperability Test Plan) recom...
Conference Paper
Full-text available
Wireline communication using the copper plant is one of the major access techniques. The shorter the wires, the larger is the frequency band that can be exploited in an economically feasible way. Several technologies using frequency bands up to 30 MHz have been standardized during the last decade. Properties of the wireline channel for frequencies...
Conference Paper
Full-text available
Crosstalk is one of the main limiting factors in the data rates achievable by digital subscriber line (DSL) systems, and several algorithms have been proposed to mitigate this impairment. In this paper, we compare the capacity of binders under different crosstalk-mitigating techniques. When computing capacity, we also compare two different power co...
Conference Paper
Full-text available
In this paper the spectral features of impulse noise in DSL systems are mapped from the waveform domain onto the symbol domain, considering a QAM receiver. This work can be viewed as part of a full symbol domain model for impulse noise, which should include the amplitude and spectral aspects. Since the available models of impulse noise in DSL are g...
Conference Paper
Full-text available
This paper presents methodologies that could be used for characterizing subscriber telephone loops that carry DSL services (ADSL and ADSL2+), by determination and analysis of frequency response, time domain reflectometry, and impulse response of the line. From this analysis, the subscriber loop length, identification and location of impairments suc...
Article
Full-text available
High-speed communication using the copper network, originally installed for telephony, is one of the dominant Internet access techniques. Several variants of a technology referred to as digital subscriber line (DSL) have been developed, standardized and installed during the last two decades. Essentially, DSL achieves high rates by exploiting wide b...
Article
Full-text available
In order to qualify a subscriber loops for xDSL transmission, basic parameters like transfer function, scattering parameter S 11 and characteristic impedance should be known. The aim of this paper is to present a test methodology for measurements of these basic parameters. The characteristic impedance is measured by open/short method and it is comp...
Article
Full-text available
We present a theoretical and experimental analysis of non Franck-Condon effects in photoionization to the b 4Σg- state of O2+. Experimentally, by dispersing the synchrotron radiation induced O2+ b 4Σg- - a 4Πu fluorescence we derive the b 4Σg- state vibrational branching ratios in the excitation energy range 21–34 eV. The vibrational branching rati...
Article
The aim of this paper is to present procedures and methodologies in order to characterize a subscriber local loop which carries Digital Subscriber Line technology. This characterization is based on frequency response and time domain reflectometry measurements performed at local loop under test. Copyright
Article
The mass spectra from the SF6 molecule acquired by energy-resolved electron ion coincidence (EREICO) technique using (1t1g + [5t1u,1t2u]), (3eg + 1t2g), 4t1u, and 5a1g electrons after both valence and S 2p−1 6a1g core excitation reveal a strong selectivity in the dissociation from these states. From the comparison of the obtained spectra, the influ...
Article
Full-text available
The details of an experimental setup for gas phase atomic and molecular fluorescence measurements using synchrotron radiation are described in this article. The most significant part of the apparatus is an optical arrangement, which allows for simultaneous measurements of dispersed as well as total fluorescence intensity using an effusive gas jet a...
Article
Ion time-of-flight spectra, total and partial ion yield spectra were measured from the vapours of CsCl and CsBr, containing both monomer and dimer molecules. VUV radiation ranging from 7 to 20 eV was used, covering the valence ionization thresholds and the resonant excitations in Cs+. The electronic and nuclear relaxation processes in the caesium h...
Article
Near-infrared dispersed fluorescence measurements of 13 different atomic multiplets of neutral atomic fragments from photon induced neutral dissociation processes in NO are reported. For excitation of the molecules narrow band synchrotron photons of energy 17.2–25.8 eV were used. Neither Rydberg series nor other molecular states in NO known so far...
Article
Full-text available
The fragmentation of the CD4 molecule after selective ionization of the 1t2 and 2a1 electrons with photons from 70 to 290 eV has been studied with the energy-resolved electron-ion coincidence technique. The mass spectra acquired in coincidence with 1t2 electrons reveal CD4+, CD3+, and CD2+ fragments, depending on the excitation energy used. The pro...
Article
Vibrationally resolved N-2(+) (B-X) (1-2) and (0-1) emission bands were recorded after photoexcitation of N-2 in the 20-46 eV energy range. The branching ratio between these transitions reveals strong non-Franck-Condon effects. Ab initio calculations using a configuration interaction method based on Kohn-Sham orbitals indicate that the autoionisati...
Article
Full-text available
The fragmentation dynamics of the SF6 molecule following the excitations of S 2p electrons into unoccupied molecular orbitals has been studied using the energy-resolved electron-ion coincidence technique. Fragmentation patterns were found to depend on the particular excitation and on the electronic state of the molecular ion. The spectator resonant...
Article
Full-text available
Vibrationally resolved Nþ2 (B–X) (1–2) and (0–1) emission bands were recorded after photoexcitation of N2 in the20–46 eV energy range. The branching ratio between these transitions reveals strong non-Franck–Condon effects. Ab-initio calculations using a configuration interaction method based on Kohn–Sham orbitals indicate that the autoionisation of...
Article
Full-text available
Energy-resolved electron-ion coincidence spectra of the deuteromethane molecule were measured following ionization by narrow-band synchrotron radiation. The ion mass spectra were recorded in coincidence with the outer and inner valence photoelectrons and with the normal Auger electrons from the decay of the carbon 1s core hole. Complementary noncoi...
Article
Full-text available
Neutral photodissociation of CO has been investigated using synchrotron light in the range 19-26 eV by observing dispersed fluorescence from excited neutral C atoms. Follow-up ab initio calculations support the observed neutral carbon excitation functions, which to a large extent are associated with the CO Rydberg series converging to the CO+ C an...
Article
Full-text available
Absolute cross sections of new and previously observed C 1s shake-up satellites of CO2 have been measured using threshold photoelectron spectroscopy in the photon energy range 306-320 eV. The electron dynamics involved in this process are elucidated by identifying the satellites with ionic states of CO2+ and NO2+ via a qualitative `frozen core' arg...
Article
Photoionization to the N-2(+) A (2)Pi(u) state and to the O-2(+) X (2)Pi(g) state is studied using photoelectron spectroscopy. The experimental vibrational branching ratios are obtained for the first time in the 19-34 eV region for the nu' = 0-3 levels, for both molecules. Ab initio many-body perturbation theory is used to calculate branching ratio...
Article
Full-text available
Electron-ion coincidence measurements with energy-resolved electrons are a powerful tool in studies of molecular fragmentation processes, since fragmentation from a specific doorway state can be monitored while the remaining reactions are discriminated. Presently, we have applied this technique in measurements of coincidence spectra of the CD4 and...
Article
Photoionization to the N2+ A 2Piu state and to the O2+ X 2Pig state is studied using photoelectron spectroscopy. The experimental vibrational branching ratios are obtained for the first time in the 19-34 eV region for the v' = 0-3 levels, for both molecules. Ab initio many-body perturbation theory is used to calculate branching ratios for ionizatio...
Article
The basic features of a simple radial position-sensitive detector design, construction and performance, are described in detail in this paper. The electronics and method used to correlate the position information from the spectrum recorded by the detector are presented. Monte Carlo simulations of the performance of the detector embedded in a time o...
Article
Full-text available
Summary: A compendium of the author's doctoral thesis and eight scientific papers he co-authored. Thesis (doctoral)--Royal Institute of Technology, Stockholm. Includes bibliographical references. Errata slip inserted. "ISSN 0280-316X"--Cover.
Article
Photoionization to the N-2(+) A (2)Pi (u) state is studied using photoelectron spectroscopy. Experimentally, vibrational branching ratios for the upsilon ' = 0-3 levels obtained for the first time in the 20-34 eV region, show strong non Franck-Condon effects around 22 eV, Using ab initio many body perturbation theory, branching ratios for ionizatio...
Article
Photoionization to the N2+A2Πu state is studied using photoelectron spectroscopy. Experimentally, vibrational branching ratios for the v′=0–3 levels obtained for the first time in the 20–34 eV region, show strong non Franck–Condon effects around 22 eV. Using ab initio many body perturbation theory, branching ratios for ionization to the A2Πu state...
Article
Photoionization to the O2+X2Πg state is studied using photoelectron spectroscopy. Experimentally, vibrational branching ratios for the v=0to3 levels are obtained in the 19–31 eV region which show strong non Franck–Condon effects. Using ab initio many body perturbation theory branching ratios, vibrationally resolved partial cross-sections and total...
Article
Photoionization to the O-2(+) X (2)Pi (g), state is studied using photoelectron spectroscopy. Experimentally, vibrational branching ratios for the nu = 0 to 3 levels are obtained in the 19-31 eV region which show strong non Franck-Condon effects. Using ab initio many body perturbation theory branching ratios, vibrationally resolved partial cross-se...
Article
Full-text available
The mechanisms of neutral dissociation of oxygen molecules in the excitation energy range 15-25 eV have been studied in a dispersed fluorescence experiment. By detecting the fluorescence from excited oxygen atoms, we find that neutral superexcited O2 states below 20 eV dissociate into O(g.s.)+O(3s,3p). At higher excitation energies (hν=20-25 eV) th...
Article
Full-text available
Neutral photodissociation from N2 has been studied in the range 20-30 eV by observing dispersed fluorescence from excited N fragments. From comparisons with calculations using many-body perturbation theory it follows that these fragmentations follow from predissociations of N2 Rydberg series by a number of non-Rydberg doubly excited states.
Article
Threshold electron and total ion yield spectra are presented for the near C and O 1s edge photoexcitation of n- and iso-propanol. To our knowledge these are the first such data for iso-propanol, and represent the first direct measurement of the core ionization energies of these molecules by threshold photoelectron spectroscopy. In particular, the C...
Article
Full-text available
3 Robotiker-Tecnalia, Telecom Unit Parque Tecnológico, Edificio 202. E-48170 Zamudio (Bizkaia), Spain, ipinilla@robotiker.es Broadband Access Networks are composed of a wide variety of access technologies and transport protocols hindering end-to-end Quality of Service (QoS) provisioning. Protocol diversity could be overcome by defining appropriate...
Article
Full-text available
The automatic interpretation of reflectometry traces to identify twisted-pair loops can be considered a pattern recognition problem. Thus, any loop make-up algorithm must firstly extract features from the reflectogram before starting a classification process. This paper focuses on feature extraction through the echo identification on time domain re...
Article
Full-text available
Resumo -A tendência crescente de transmissão de tráfego triple play (voz, vídeo e dados) via internet é um fenômeno de amplitude mundial. Entretanto, para obter-se uma comunicação satisfatória, deve-se estudar o processo de maneira fim-a-fim. Em regiões com pouca infra-estrutura de telecomunicações, uma das preocupações recai sobre as tecnologias d...

Network

Cited By

Projects

Projects (4)
Archived project
Project
Improve RFC 4861's NDP for Wireless Networks