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  • Coordinated beamforming access for interfering half-duplex relay networks

     Torrellas Socastro, Marc; Agustin de Dios, Adrian; Vidal Manzano, Jose
    IEEE International Conference on Communications
    Presentation's date: 2013-06-09
    Presentation of work at congresses

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    This work deals with a relay-assisted cellular network, where the downlink communication is carried out in two orthogonal phases. In the first-hop transmission, multiple evolved Node Bs (eNB) transmit in a coordinated way to multiple half-duplex Relay Nodes (RNs). In the second-hop transmission, each RN assists a single User Equipment (UE) without precise channel knowledge. In the first hop, we consider two multiple- intput multiple-output (MIMO) access schemes: Interference Alignment (IA) and block diagonalization zero-forcing (ZF-BD) precoders for which power and transmission time to RNs are optimally allocated. Cell capacity and outage rates are evaluated and benchmarked to the case where network-MIMO (N-MIMO) coordinated transmission in used in the first hop

  • Degrees of freedom of the rank-deficient MIMO X channel

     Agustin de Dios, Adrian; Vidal Manzano, Jose
    IEEE Information Theory Workshop
    Presentation's date: 2013-09-12
    Presentation of work at congresses

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    The multiple-input multiple-output (MIMO) X channel with rank-deficient channels is considered. We characterize the total degrees of freedom (DoF) by defining an outer bound which is attained by the proposed precoding scheme. The total DoF are described in closed-form when all transmitters and receivers have M and N antennas, respectively. For an arbitrary number of antennas, the total DoF are obtained as solution of a linear programming problem. Results elucidate that, unlike point-to-point MIMO systems where DoF increase with the rank of the channel, the total DoF in a multipoint-to-multipoint MIMO system can increase up to a certain point if channels are rankdeficient. Hence, we corroborate the relevance of knowing the rank-deficiency in the MIMO X channel, a property already observed in the MIMO Interference channel.

  • Joint allocation of radio and computational resources in wireless application offloading

     Muñoz Medina, Olga; Pascual Iserte, Antonio; Vidal Manzano, Jose
    Future Network and MobileSummit
    Presentation's date: 2013-07
    Presentation of work at congresses

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    Providing femto-access points (FAPs) with computational capabilities will allow (either totally or partially) offloading of highly demanding applications from smart-phones to the so called femto-cloud. Such offloading promises to be beneficial in terms of battery saving at the mobile terminal (MT) and/or latency reduction in executing applications, if the energy and/or time required for the communication process are compensated by the energy and/or time savings that result from remote computation. For this scenario, we provide a general framework that allows the joint allocation of radio and computational resources resulting in an optimized trade-off between energy consumption and latency. Such energy ansumption includes contributions from both communication and computation segments. Complex communication models (e.g. multi-input multi-output (MIMO) transmission) can be encompassed within the proposed framework. Moreover, practical constraints can be included, such as energy constraints, application constraints, as well as radio and computational constraints. As a result of the optimization, the optimal communication strategy (transmission power, rate, etc.) between the handset and the serving FAP is obtained, as well as the optimal distribution of computation tasks between the handset and the FAPs in the femto-cloud. A particular case is defined: when all the computation tasks are forced to be done in either the handset or the femto-cloud. In such a case, the proposed framework will provide the necessary information to decide whether offloading the application is beneficial

  • Distributed inter-cluster interference management for CoMP-based cellular networks

     Lagen Morancho, Sandra; Agustin de Dios, Adrian; Vidal Manzano, Jose
    IEEE Global Communications Conference
    Presentation's date: 2013-12-12
    Presentation of work at congresses

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    This paper proposes distributed inter-cluster interference management procedures for 1 Coordinated Multi-Point (CoMP) Time Division Duplexing (TDD) cellular networks, in which a set of base stations (BSs), that form a cluster, cooperate in the downlink (DL) and uplink (UL) transmissions to communicate with a group of users while causing interference to users in neighbor clusters. In order to reduce the complications associated to the estimation of the interfering channels, we describe new iterative procedures based on channel reciprocity that avoid such estimation by exploiting the received signal in the UL, provided that transmit and receive filters in DL and UL are properly designed. Simulations show that proposed techniques attain significant DL and UL spectral efficiency gains. Furthermore, an analysis of imperfect channel state information (CSI) at both ends is included, evidencing the robustness of the proposed procedures. Considerations on convergence are included.

  • Network-MIMO for downlink in-band relay transmissions

     Lagen Morancho, Sandra; Agustin de Dios, Adrian; Vidal Manzano, Jose
    Eurasip journal on wireless communication and networking
    Date of publication: 2013-01-23
    Journal article

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    With the objective of improving the spectral efficiency and coverage homogeneity of wireless cellular systems in the downlink, we investigate how to take advantage of two promising transmission technologies envisioned in current standards: network-MIMO and relay stations (RSs). It is assumed that half-duplex RSs are deployed in a cellular system, where the duration of the relay-receive and the relay-transmit phases is fixed beforehand for all cells. In order to reduce the spectral efficiency loses associated to half-duplex relaying, we propose the use of base station (BS) cooperation under a network-MIMO precoding strategy based on block-diagonalization zero-forcing, and optimize radio resources under the convex performance criteria constrained by the per-BS power, modulation and coding schemes and the transmission rate in the relay-transmit phase. By applying convex optimization techniques, the optimal precoding strategy is derived and a suboptimal low complexity solution is also proposed. The obtained solutions are evaluated at system level and compared to other cooperative and non-cooperative BS-based schemes.

  • PORTABLE KIT FOR DETECTING TRAPPED AND BURIED PEOPLE

     Vidal Manzano, Jose; Silva Pereira, Silvana; Pages Zamora, Alba Maria
    Participation in a competitive project

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  • Wireless technologies for isolated rural communities in developing countries based on cellular femtocell deployment

     Muñoz Medina, Olga; Vidal Manzano, Jose; Pascual Iserte, Antonio; Agustin de Dios, Adrian; Fernandez Rubio, Juan-antonio
    Participation in a competitive project

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  • MCS and sub-band selection for downlink interference coordination in LTE-A Femtocells

     Muñoz Medina, Olga; Agustin de Dios, Adrian; Vidal Manzano, Jose
    IEEE Vehicular Technology Conference
    Presentation's date: 2012-09
    Presentation of work at congresses

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    This paper proposes a decentralized algorithm for interference coordination in LTE-A networks, based on the exchange of information (pricing) at control plane level. In our approach, every user equipment (UE) report the maximum modulation and coding scheme (MCS) that can be used within several sets (sub-bands) of available resource blocks, along with a parameter (cost) that measures the MCS degradation due to the transmission from an interfering neighbor. Through the exchange of pricing messages, the higher costs are distributed to the dominant interferers; and the selection of the MCS and operational sub-band is based on the current link conditions along with the received pricing messages. We evaluate the algorithm in a cellular area covered by a macro base station (MBS) and multiple active femtocells. We also measure the degradation due to the quantization of the exchanged cost values. The results demonstrate significantly enhanced performance as compared to the non-coordinated case.

  • Downlink coordinated radio resource management in cellular networks with partial CSI

     Calvo Page, Eduard; Muñoz Medina, Olga; Vidal Manzano, Jose; Agustin de Dios, Adrian
    IEEE transactions on signal processing
    Date of publication: 2012-03
    Journal article

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    We explore decentralized coordination of sectored cellular networks to adapt the usage of downlink resources to the instantaneous network conditions. The transmission frame consists of an orthogonal bandwidth usage phase, where sectors perform FDMA and power control over an agreed frequency chunk, and a shared bandwidth usage phase where each sector performs FDMA over the full available bandwidth without power control (interference is not controlled in this phase by any means). Decentralized network utility maximization with global optimality guarantee is enabled by fixing this structure of the transmission frame, which does not cause significant network-wide losses. Thus, the ability to better balance the resources gained from coordination generates some slack that can be used to either i) provide higher-quality access, ii) increase the number of active users, or iii) reduce deployment and maintenance costs by operating larger cells.

  • Feedback of Channel State Information in Multi-Antenna Systems Based on Quantization of Channel Gram Matrices  Open access

     Sacristan Murga, Daniel Francisco
    Defense's date: 2012-07-19
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

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    This dissertation deals with the proper design of efficient feedback strategies for Multiple-Input Multiple-Output (MIMO) communication systems. MIMO systems outperform single antenna systems in terms of achievable throughput and are more resilient to noise and interference, which are becoming the limiting factors in the current and future communications. Apart from the clear performance advantages, MIMO systems introduce an additional complexity factor, since they require knowledge of the propagation channel in order to be able to adapt the transmission to the propagation channel’s characteristics and achieve optimum performance. This channel knowledge, also known as Channel State Information (CSI), is estimated at the receiver and sent to the transmitter through a limited feedback link. In this dissertation, first, the minimum channel information necessary at the transmitter for the optimum precoding design is identified. This minimum information for the optimum design of the system corresponds to the channel Gram matrix. It is essential for the design of optimized systems to avoid the transmission of redundant feedback information. Following this idea, a quantization algorithm that exploits the differential geometry of the set of Gram matrices and the correlation in time present in most propagation channels is developed in order to greatly improve the feedback performance. This scheme is applied first to single-user MIMO communications, then to some particular multiuser scenarios, and finally it is extended to general multiuser broadcast communications. To conclude, the feedback link sizing is studied. An analysis of the tradeoff between size of the forward link and size of the feedback link isformulated and the radio resource allocation problem, in terms of transmission energy, time, and bandwidth of the forward and feedback links is presented.

    En un mundo cada vez más interconectado, donde hay una clara tendencia hacia un mayor número de comunicaciones inalámbricas simultáneas (comunicaciones M2M: Machine to Machine, redes de sensores, etc.) y en el que las necesidades de capacidad de transmisión de los enlaces de comunicaciones aumentan de manera vertiginosa (audio, video, contenidos multimedia, alta definición, etc.) el problema de la interferencia se convierte en uno de los factores limitadores de los enlaces junto con los desvanecimientos del nivel de señal y las pérdidas de propagación. Por este motivo los sistemas que emplean múltiples antenas tanto en la transmisión como en la recepción (los llamados sistemas MIMO: Multiple-Input Multiple-Output) se presentan como una de las soluciones más interesantes para satisfacer los crecientes requisitos de capacidad y comportamiento relativo a interferencias. Los sistemas MIMO permiten obtener un mejor rendimiento en términos de tasa de transmisión de información y a su vez son más robustos frente a ruido e interferencias en el canal. Esto significa que pueden usarse para aumentar la capacidad de los enlaces de comunicaciones actuales o para reducir drásticamente el consumo energético manteniendo las mismas prestaciones. Por otro lado, además de estas claras ventajas, los sistemas MIMO introducen un punto de complejidad adicional puesto que para aprovechar al máximo las posibilidades de estos sistemas es necesario tener conocimiento de la información de estado del canal (CSI: Channel State Information) tanto en el transmisor como en el receptor. Esta CSI se obtiene mediante estimación de canal en el receptor y posteriormente se envía al transmisor a través de un canal de realimentación. Esta tesis trata sobre el diseño del canal de realimentación para la transmisión de CSI, que es un elemento fundamental de los sistemas de comunicaciones del presente y del futuro. Las técnicas de transmisión que consideran activamente el efecto de la interferencia y el ruido requieren adaptarse al canal y, para ello, la realimentación de CSI es necesaria. En esta tesis se identifica, en primer lugar, la mínima información sobre el estado del canal necesaria para implementar un diseño óptimo en el transmisor, con el fin de evitar transmitir información redundante y obtener así un sistema más eficiente. Esta información es la matriz de Gram del canal MIMO. Seguidamente, se desarrolla un algoritmo de cuantificación adaptado a la geometría diferencial del conjunto que contiene la información a cuantificar y que además aprovecha la correlación temporal existente en los canales de propagación inalámbricos. Este algoritmo se implementa y evalúa primero en comunicaciones MIMO punto a punto entre dos usuarios, después se implementa para algunos casos particulares con múltiples usuarios, y finalmente se amplía para el caso general de sistemas broadcast multi-usuario. Adicionalmente, esta tesis también estudia y optimiza el dimensionamiento del canal de realimentación en función de la cantidad de recursos radio disponibles, en términos de ancho de banda, tiempo y potencia de transmisión. Para ello presenta el problema de la distribución óptima de dichos recursos radio entre el enlace de transmisión de datos y el enlace de realimentación para transmisión de información sobre estado del canal como un problema de optimización.

  • Distributed Consensus Algorithms for Wireless Sensor Networks Convergence Analysis and Optimization

     Silva Pereira, Silvana
    Defense's date: 2012-01-26
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

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  • FREEDOM D2.3.1 - Technology implementation plans

     Vidal Manzano, Jose; Barbarossa, S.; Imponente, G.; Roux, P.; Becvar, Z.; Vivier, G.; Corre, Y.; Hariyanto, H.
    Date: 2012-01
    Report

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    This report captures the technology implementation plan from partners involved in FREEDOM. It summarizes how the technology developed in the framework of FREEDOM will impact the current or future business of the partners.

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    FREEDOM D3.3 - Cooperative schemes in the femto-based networks  Open access

     Agustin de Dios, Adrian; Vidal Manzano, Jose; Pescosolido, L.; Barbarossa, S.; Kammoun, M.; Sarkiss, M.
    Date: 2012-01
    Report

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    We investigate cooperative transmission schemes that can be applied to joint deployments of femto-access points (FAPs) and macro base stations (MBS) by exploiting backhaul communication links between nodes at the data-plane level. First, we study the effects of some hardware impairments, such as time misalignment and carrier offset compensation, on cooperation performance. Additionally, we look into the MIMO X channel as a general framework that subsumes all possible types of cooperative communication between two sources and two destinations (broadcast, interference or multiple access channels), assuming full channel state information at the transmitters. Since FAPs have a delay constrained backhaul the cooperation of multiple FAPs becomes sensitive to random delays at the sources. In this regard we have provided two solutions: a) appropriate delay-tolerant cooperative space-time coding and decoding schemes and b) specific cooperative schemes for critical delay applications.

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    FREEDOM - D42 Design and evaluation of effective procedures for MAC layer  Open access

     Mach, P.; Becvar, Z.; Bestak, R.; Neruda, M.; Roux, P.; Hariyanto, H.; Ari Wibowo, F.X.; Agustin de Dios, Adrian; Muñoz Medina, Olga; Vidal Manzano, Jose; Carfagna, A.
    Date: 2012-01
    Report

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    The implementation of femtocells introduces many technical challenges that must be solved in order to fully exploit their potentials. This deliverable primarily focuses on control procedures for radio resource management addressing the most critical issues. To utilize radio resources of femtocell efficiently, a novel routing of data among user s served by the same femtocell is proposed. Furthermore, spectrum-efficient technique for power control, scheduling (both at radio side and backhaul side and multicast/broadcast services transmissions are designed. Additionally, novel authorization approaches and femtocells’ identification technique are proposed while taking in consideration the scalability of the system. This document designs and specifies the control plane procedures to ensure effective coordination among femtocells and macrocell designed in WP3. Finally, cross-layer optimization issues are addressed here by means of optimal femtocells’ power allocation derivation using the Game Theory framework.

  • Distributed computing, storage and radio resource allocation over cooperative femtocells

     Muñoz Medina, Olga; Agustin de Dios, Adrian; Pascual Iserte, Antonio; Vidal Manzano, Jose; Lagen Morancho, Sandra; Torrellas Socastro, Marc
    Participation in a competitive project

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  • Preemption and QoS management algorithms for coordinated and uncoordinated base stations

     Muñoz Medina, Olga; Pascual Iserte, Antonio; Baquero, Pau; Vidal Manzano, Jose
    IEEE International Workshop on Signal Processing Advances in Wireless Communications
    Presentation's date: 2011-06
    Presentation of work at congresses

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  • Network-MIMO backhauling for QOS-constrained relay transmission

     Vidal Manzano, Jose; Agustin de Dios, Adrian; Lagen, Sandra; Valera, Eduard; Muñoz Medina, Olga; García Armada, Ana; Sánchez Fernández, Matilde
    IEEE International Conference on Acoustics, Speech and Signal Processing
    Presentation's date: 2011-05
    Presentation of work at congresses

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    A relay station (RS)-based cellular system deployment is considered, where multiple base stations (BS) cooperate in the BS-RS in-band transmission for the downlink. With the joint optimization of the resources allocated to the wireless backhaul and to the RS-MS access, it is possible to exploit the benefits of networked-MIMO along with combating the pathloss and shadowing effects, and thus obtain significantly enhanced spectral efficiency and coverage homogeneity. The problem is shown to be convex under conventional QoS objective functions. Suboptimal low complexity solutions are also proposed and evaluated.

  • Improved interference alignment precoding for the MIMO X channel

     Agustin de Dios, Adrian; Vidal Manzano, Jose
    IEEE International Conference on Communications
    Presentation's date: 2011-06
    Presentation of work at congresses

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    We derive a linear transmit precoding scheme based on interference alignment at the transmitters and zero-forcing at the receivers, for the MIMO X channel based on the Generalized Singular Value Decomposition (GSVD) that is able to attain the outer bound on the degrees of freedom (DoF) region for any antenna configuration, except when all terminals have one antenna. Additionally, the proposed scheme is able to enhance the transmission rate in terms of high SNR offset.

  • Network MIMO for downlink in-band relay transmissions with relaying phases of fixed duration

     Agustin de Dios, Adrian; Vidal Manzano, Jose; Lagen, Sandra; Valera, Eduard
    European Signal Processing Conference
    Presentation's date: 2011-08
    Presentation of work at congresses

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    A half-duplex relay station (RS)-based cellular system deployment is considered, where multiple base stations (BS) cooperate in the BS-RS in-band transmission for the downlink. The duration of the relay-receive and the relay-transmit phases are fixed beforehand, so that the interference induced by other cells is stationary during a transmission interval. With the optimization of the precoders and powers allocated to the wireless backhaul (relay-receive phase)and to the RS-MS access (relay-transmit phase), it is possible to exploit the benefits of network-MIMO (N-MIMO) along with combating the pathloss and shadowing effects thanks to the RSs. Consequently, an appealing significant enhanced spectral efficiency, power efficiency and coverage homogeneity are obtained. Results are benchmarked to the case where the relay phases are optimized.

  • Interference pricing for self-organisation in OFDMA femtocell networks

     Agustin de Dios, Adrian; Vidal Manzano, Jose; Muñoz Medina, Olga
    Future Network and MobileSummit
    Presentation's date: 2011-06
    Presentation of work at congresses

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  • Decentralized weighted sum rate maximization in MIMO-OFDMA femtocell networks

     Agustin de Dios, Adrian; Vidal Manzano, Jose; Muñoz Medina, Olga; Rodriguez Fonollosa, Javier
    IEEE Global Communications Conference
    Presentation's date: 2011-12
    Presentation of work at congresses

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    We propose a decentralized strategy for downlink interference management in overlaid MIMO femtocell-macrocell deployments operating in the same band under OFDMA access. The resource allocation, consisting of MIMO precoders at the macro base station (MBS) and femto access points (FAPs) and possibly the resource block (RB) assignment, is designed to maximize the Weighted Sum Rate (WSR) of the system. Being the overall problem non-convex, we propose to solve it in a decentralized way where each transmitter designs its resource allocation using interference prices exchanged with other transmitters (FAPs and MBS) by exploiting the wired backhaul connection. The problem includes a rate restriction per FAP that accounts for the limited bitrate provided by the Internet Service Provider (ISP) wired backhaul. Two efficient algorithms are provided for: 1) optimizing MIMO precoders and 2) optimizing both MIMO precoders and RB assignment. Numerical results compare decentralized strategies based on pricing exchange and on pure competition in dense FAP deployments.

  • Weighted sum rate maximization for the MIMO X channel through MMSE precoding

     Agustin de Dios, Adrian; Vidal Manzano, Jose
    IEEE International Symposium on Information Theory
    Presentation's date: 2011-08
    Presentation of work at congresses

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  • Coordinated MIMO precoding for power minimization in femtocell systems

     Muñoz Medina, Olga; Vidal Manzano, Jose; Agustin de Dios, Adrian; Pascual Iserte, Antonio; Barbarossa, Sergio
    IEEE Global Communications Conference
    Presentation's date: 2011-12
    Presentation of work at congresses

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  • Relay-assisted wireless networks

     Agustin de Dios, Adrian; Vidal Manzano, Jose; Muñoz Medina, Olga; Glisic, S
    Date of publication: 2011
    Book chapter

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  • Macrocelulas y Femtocelulas en Sistemas con Técnicas Avanzadas de Coordinación de la Interferencia y Cooperación

     Vidal Manzano, Jose; Rodriguez Fonollosa, Javier; Cabrera Bean, Margarita Asuncion; Fernandez Rubio, Juan-antonio; Pages Zamora, Alba Maria; Agustin de Dios, Adrian; Silva Pereira, Silvana; Garcia Ordoñez, Luis; Vila Valls, Jordi; Muñoz Medina, Olga
    Participation in a competitive project

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    FREEDOM Project. Interference coordination protocols in femto-based networks  Open access

     Agustin de Dios, Adrian; Muñoz Medina, Olga; Vidal Manzano, Jose; Goldhamer, M.; Rodriguez Fonollosa, Javier; Pastore, A.; Sardellitti, Stefania; Pescosolido, Loreto; di Lorenzo, Paolo; Barbarossa, Sergio; Baiocchi, Andrea; de Marinis, Enrico; Imponente, Giovanni; Pucci, Fabrizio; Rosi, Guido
    Date: 2011-11-28
    Report

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    This document looks into coordinated radio resource allocation algorithms in deployments of huge number of femto-access points (FAP) by exploiting the message exchange at control-plane level through the wired ISP backhaul link. The algorithms present in this document are based on decentralized cooperative strategies supported by Game Theory. Decentralized resource allocation algorithms based on price exchange have been derived under different criteria: guaranteeing a minimum rate with the minimum power, maximizing the weighted sum-rate of the system, maximizing the opportunistic throughput when there are different source of randomness like random link failures and noise quantization or when the activity of macro-users is not known by FAPs (coordinated channel sensing or modelling the activity). Additionally, a genetic-based resource allocation is investigated, providing centralized and decentralized algorithms, to which the Game Theory solutions are challenged. In all cases, the techniques derived require modifications of the current LTE-A standard which are identified. Finally, some of those algorithms have been evaluated in a Realistic corporate scenario elucidating the advantages of coordinated resource allocation techniques proposed.

    Postprint (author’s final draft)

  • Technoeconomic evaluation of cooperative relaying transmission techniques in OFDM cellular networks

     Moral, Antolín; Vidal Manzano, Jose; Pérez, Jorge; Agustin de Dios, Adrian; Marina, Ninoslav; Host-Madsen, Anders
    Eurasip journal on advances in signal processing
    Date of publication: 2011-02-27
    Journal article

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    We evaluate the costs in the deployment of a 4G relay-assisted network in the 2.6GHz band following a technoeconomic methodology that departs fromcell dimensioning based on spectral efficiency and outage capacity requirements. Different decodeand- forward relaying protocols are considered in the analysis, assuming a certain traffic load evolution over a period of ten years, different geotypes, and a progressive deployment of base stations and relay stations. Results show significant benefits for operators as well as reduction in the total radiated power.

  • MÉTODO Y SISTEMA PARA LA GESTIÓN DESCENTRALIZADA DE FEMTOCÉLULAS VECINAS

     Rodriguez Fonollosa, Javier; Agustin de Dios, Adrian; Vidal Manzano, Jose; Muñoz Medina, Olga
    Date of request: 2011-11-28
    Invention patent

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    Método y sistema para la gestión descentralizada de femtocélulas vecinas.

    El método comprende:

    - la comunicación, a una primera femtocélula desde una segunda femtocélula, de la siguiente información:

    i) la restricción de requerimientos de interferencia de un usuario activo de la segunda femtocélula, y

    ii) uno o más parámetros que caracterizan un canal radio físico definido desde la primera femtocélula hasta dicho al menos un usuario activo de la segunda femtocélula;

    - la autoconfiguración de los parámetros de transmisión de la primera femtocélula usando la información comunicada i) y ii).

    El sistema está configurado para implementar el método de la invención.

  • Classification of linear and non-linear modulations using the Baum¿Welch algorithm and MCMC methods

     Puengnim, Anchalee; Thomas, N.; Tourneret, Jean-Yves; Vidal Manzano, Jose
    Signal processing
    Date of publication: 2010-12
    Journal article

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    Performance of downlink schedulers with superposed or orthogonal transmissions  Open access

     Agustin de Dios, Adrian; Vidal Manzano, Jose; Muñoz Medina, Olga
    IEEE International Conference on Communications
    Presentation's date: 2010-05-26
    Presentation of work at congresses

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    This work looks into the extension of the proportional fair (PF) scheduler to the multi-user case, where the source is transmitting several messages under the superposition coding (SC) strategy in a Gaussian Broadcast channel. Jointly with the weighted sum-rate (WSR) scheduling criterion, we derive guidelines for 2-user pairing, based both on SNR and user priority. We compare superposition coding access with frequency division multiple access, while time division is obtained naturally as a result of the user pairing. Results elucidate that the 2-user SC PF always improves the single-user PF in terms of average throughput and delay reduction, and we compare its performance with the 3-user SC PF. Finally, the WSR shows throughput gains similar to the 2-user SC PF for certain configuration of the scheduler.

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    Compress-and-forward cooperative mimo relaying with full channel state information  Open access

     Simoens, Sebastien; Muñoz Medina, Olga; Vidal Manzano, Jose; Del Coso, Aitor
    IEEE transactions on signal processing
    Date of publication: 2010-02
    Journal article

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    Postprint (author’s final draft)

  • On the computation of the capacity region of the discrete MAC

     Calvo, Eduard; Pérez Palomar, Daniel; Rodriguez Fonollosa, Javier; Vidal Manzano, Jose
    IEEE transactions on communications
    Date of publication: 2010-12
    Journal article

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  • Professor honorari de la UCAB

     Vidal Manzano, Jose
    Award or recognition

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    FREEDOM Project. Scenario, requirements and first business model analysis  Open access

     Vivier, G.; Agustin de Dios, Adrian; Vidal Manzano, Jose; Muñoz Medina, Olga; Barbarossa, Sergio; Pescosolido, Loreto; Omilipo, M; de Marinis, Enrico; Imponente, Giovanni; Lopatka, M; Roux, P; Kamoun, M; Becvar, Z; Mach, P; Corre, Y; Hariyanto, H; Widiawan, A.K.; Simamora, L
    Date: 2010-06-20
    Report

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    This deliverable is the first of FREEDOM project. It provides an outlook of the scenarios and assumptions widely shared in the wireless community when addressing femtocell deployment. It starts by providing scenarios as seen from the business perspective, and then they are further described with a more technical perspective. Both interference and mobility are addressed although from the review of foras and standardization bodies, the interference issues are more extensively considered. From these scenarios we derived a list of requirement that should be met by femto-cell systems. These requirements must drive the technical work in the other work-pacakges of FREEDOM. The report then captures the main assumptions for simulation in order to align the work from various WPs and partners around similar set of assumptions. A final section presents true business model from operator standpoint, highlighting the potential of massive femto-cell deployment.

    Postprint (author’s final draft)

  • FEMTOCELL-BASED NETWORK ENHANCEMENT BY INTERFERENCE MANAGEMENT AND COORDINATION OF INFORMATION FOR SEAMLESS CONNECTIVITY

     Muñoz Medina, Olga; Rodriguez Fonollosa, Javier; Agustin de Dios, Adrian; Fernandez Rubio, Juan-antonio; Vidal Manzano, Jose
    Participation in a competitive project

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  • INTERFERENCE IN WIRELESS NETWORKS: Cancelation, Impact, Practical Management, and Complexity.

     Calvo Page, Eduardo
    Defense's date: 2009-01-26
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

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  • Cooperative MIMO Communications - Information Theoretical Limits and Practical Coding Strategies

     Simoens, Sebastien
    Defense's date: 2009-07-09
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

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  • Access to the full text
    Downlink multi-cell radio resource management for coordinated base stations  Open access

     Muñoz Medina, Olga; Calvo Page, Eduard; Vidal Manzano, Jose; Agustin de Dios, Adrian
    IEEE Vehicular Technology Conference
    Presentation's date: 2009-04-28
    Presentation of work at congresses

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    Analytical resource optimization for DF relay-assisted transmission under HARQ  Open access

     Agustin de Dios, Adrian; Vidal Manzano, Jose; Muñoz Medina, Olga
    IEEE Vehicular Technology Conference
    Presentation's date: 2009-04-28
    Presentation of work at congresses

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    Under limited channel state information at the transmitter the communication suffers from the outage events produced by a data rate selection not supported by the current channel realization. Automatic repeat request (ARQ) protocols are a useful tool to deal with those outage events in delay-tolerant services. This work looks into how Automatic Repeat Request(ARQ) protocols are applied to the half-duplex relay-assisted transmission with a decode-and-forward (DF) relay. The exploitation of ACK feedback channels from destination and relay leads to two possible implementations: 1) only-source manages the retransmission procedure or 2) both source and relay control the retransmissions. We analyze both options under a chase-combining ARQ protocol with limited number of transmission rounds, providing integral expressions for the throughput. This study allows the optimization transmission rate and the amount of resources allocated for the relay transmission.

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    Adaptive bitrate and resource allocation for relay-assisted ARQ transmissions  Open access

     Agustin de Dios, Adrian; Vidal Manzano, Jose; Muñoz Medina, Olga
    IEEE International Conference on Communications
    Presentation's date: 2009
    Presentation of work at congresses

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    Automatic repeat request (ARQ) protocols deal with the situations where the selected data rate is not supported by the current channel realization. The inappropriate selection is motivated by the limited channel state information at the transmitter (CSIT). This work looks into how the ARQ protocols are applied to the half-duplex relay-assisted transmission with decode-and-forward relays by exploiting the ACK feedback channel of the terminals. Two implementations are tackled: 1) only the source or 2) source and relay manage the retransmissions under the pure-ARQ protocol. This work presents an analytical framework for the comparison of both options. The study allows the optimization of the bitrate and amount of resource allocated for the relay transmission phases.

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    Protocols and resource allocation for the two-way relay channel with half-duplex terminals  Open access

     Agustin de Dios, Adrian; Vidal Manzano, Jose; Muñoz Medina, Olga
    IEEE International Conference on Communications
    Presentation's date: 2009
    Presentation of work at congresses

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    The two-way relay channel (TWRC) describes the communication between two terminals sharing a common relay. In this work we compare different protocols for the TWRC with a half-duplex relay (forwarding and protocol I) and transmission schemes (Network Coding Relaying with random binning and XOR precoding), when the relay works in decode-and-forward and without channel state information at the transmitters. We provide the optimal resource allocation (in terms of phase duration, data rate and power allocation) when there is an individual or sum-average power constraint over the terminals. Closed-form solutions are derived whenever it is possible, while for others cases we show that the resource allocation can be formulated as a convex problem, which means that the solution can be obtained by low-complexity interior point methods.

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    On the totally asynchronous interference channel with single-user receivers  Open access

     Calvo Page, Eduard; Rodriguez Fonollosa, Javier; Vidal Manzano, Jose
    IEEE International Symposium on Information Theory
    Presentation's date: 2009-07-03
    Presentation of work at congresses

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    The performance characterization of decentralized wireless networks with uncoordinated sender-destination pairs motivates the study of the totally asynchronous interference channel with single-user receivers. Since this channel is not information stable, its capacity region is determined resorting to information density, although more amenable single-letter inner and outer bounds are provided as well. Aiming at numerical evaluation of the achievable rates, we subsequently concentrate on the inner bound for the Gaussian case. We show that taking Gaussian inputs is not the best choice in general and derive analytical conditions under which other input distributions may be optimal. Essentially, these conditions require the channel to be interference-limited. Finally, the existence of such non-Gaussian distributions with superior performance is validated numerically in different scenarios.

  • Optimal Resource Allocation in Relay-Assisted Cellular Networks With Partial CSI

     Calvo, E; Vidal Manzano, Jose; Rodriguez Fonollosa, Javier
    IEEE transactions on signal processing
    Date of publication: 2009-07
    Journal article

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  • Cooperative wireless networking beyond store-and-forward : Perspectives in PHY and MAC design

     Valentin, Stefan; Hermann, Lichte S; Holger, Karl; Guillaume, Vivier; Simoens, S; Vidal Manzano, Jose; Agustin de Dios, Adrian
    Wireless personal communications
    Date of publication: 2009-01
    Journal article

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  • RRM strategies in multihop and cooperative transmission

     Muñoz Medina, Olga; Vidal Manzano, Jose; Calvo Page, Eduard; Agustin de Dios, Adrian
    Date of publication: 2009-06-01
    Book chapter

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  • Relaying techniques for OFDM-MIMO systems

     Muñoz Medina, Olga; Vidal Manzano, Jose; Agustin de Dios, Adrian; Simoens, Sebastien; Calvo Page, Eduard; Hoshyar, Reza; Liu, Yajian
    Date of publication: 2009-06-01
    Book chapter

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  • Contributions to distributed video coding

     Artigas Roca, Javier
    Defense's date: 2009-11-05
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

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  • SPARKLE: Spectrum-Agile Network of Cooperative Relays With Efficient Interference Coordination

     Agustin de Dios, Adrian; Vidal Manzano, Jose
    Participation in a competitive project

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  • FREEDOM: Femtocell -Based Network By Interface Management And Coordination Of Information

     Muñoz Medina, Olga; Agustin de Dios, Adrian; Vidal Manzano, Jose
    Participation in a competitive project

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  • FREEDOM

     Muñoz Medina, Olga; Agustin de Dios, Adrian; Vidal Manzano, Jose
    Participation in a competitive project

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