CTTC

Displaying 1-9 of 9 results

  • White Papers // Apr 2013

    Modeling and Exploiting the Relation Between Packet Losses and Hidden Traffic

    Now-a-days, it is common to find multiple WLAN deployments coexisting in shared spaces. The resulting interference between transmissions represents an important source of performance degradation, especially those originating from hidden traffic. This note explores the relation between hidden traffic and packet losses, using renewal theory to show that losses constitute...

    Provided By CTTC

  • White Papers // Mar 2013

    An SDR Implementation of a Visible Light Communication System Based on the IEEE 802.15.7 Standard

    The aim of this paper is to present an implementation of a functional IEEE 802.15.7 real-time testbed based on the Software Defined Radio (SDR) concept. This implementation is built with low cost Commercial Off-The-Shelf (COTS) analog devices and the use of Universal Software Radio Peripheral version 2 (USRP2) equipment combined...

    Provided By CTTC

  • White Papers // Feb 2013

    Smart Meter Privacy in the Presence of an Alternative Energy Source

    A Smart-Meter (SM) measures and reports the energy consumption of a user at frequent time intervals, revealing critical private information about user's energy consumption behavior. The privacy of a SM system is studied in the presence of an Alternative Energy Source (AES). The privacy-power function is introduced to study the...

    Provided By CTTC

  • White Papers // Jan 2013

    Inter-Packet Encoding to Minimize Data Block Transfer Delay in Multipath Communications

    In this paper, the authors consider the use of inter-packet encoding at the source node to improve the delay performance of data block transmissions in a multipath communication scenario. First they propose a formal derivation to obtain the coding ratio and the per-path packet allocation that minimizes the data block...

    Provided By CTTC

  • White Papers // Nov 2012

    Enhanced Turbo Decoding for Error Floor Reduction

    In this paper, the authors consider enhanced decoding of turbo codes in the error floor region. Allowing no modifications at the transmitter side, they focus on enhanced decoding algorithms which aim principally at reducing the error floor. They employ a combination of two methods which have been applied separately in...

    Provided By CTTC

  • White Papers // Nov 2009

    Docitive Networks: A Novel Framework Beyond Cognition

    Multimedia applications require virtually zero-outage connectivity whilst being strictly delay-limited, prone to interference and bandwidth hungry. Among a gamut of technical solutions, cognitive radios and networks have long been perceived as a catalyst of above requirements by facilitating efficient primary/secondary multimedia user coexistence. The degree of coexistence heavily depends on...

    Provided By CTTC

  • White Papers // Oct 2009

    Mixed TUSC and Band AMC Permutation Zone in OFDMA Systems With Limited Feedback

    In this paper a new permutation zone which combines adjacent and distributed subcarrier permutation is proposed for Orthogonal Frequency Division Multiple Access (OFDMA) systems. For such purpose two types of burst are defined: localized and distributed. A new resource allocation and scheduling algorithm that exploits such structure is then proposed....

    Provided By CTTC

  • White Papers // Mar 2009

    The Decoupling of DOA/Synchronization Parameters in Colored Noise Environments

    In the framework of antenna arrays, the authors show that the estimation of the synchronization parameters of the impinging signal (namely, time - delay and Doppler shift) is decoupled to the Direction Of Arrival estimation. They propose signal models for unstructured and structured arrays where the noise is considered Gaussian...

    Provided By CTTC

  • White Papers // Mar 2009

    Testbed Implementation of Control Plane Extensions for Inter-Carrier GMPLS LSP Provisioning

    This paper presents a testbed implementation of an inter-carrier GMPLS (Generalized Multi Protocol Label Switching) service architecture recently proposed. This architecture couples the Path Computation Element (PCE)-based control plane with a service plane managing discovery, composition and activation functions of inter-carrier service elements. The testbed implements the required PCE Communication...

    Provided By CTTC

  • White Papers // Nov 2012

    Enhanced Turbo Decoding for Error Floor Reduction

    In this paper, the authors consider enhanced decoding of turbo codes in the error floor region. Allowing no modifications at the transmitter side, they focus on enhanced decoding algorithms which aim principally at reducing the error floor. They employ a combination of two methods which have been applied separately in...

    Provided By CTTC

  • White Papers // Feb 2013

    Smart Meter Privacy in the Presence of an Alternative Energy Source

    A Smart-Meter (SM) measures and reports the energy consumption of a user at frequent time intervals, revealing critical private information about user's energy consumption behavior. The privacy of a SM system is studied in the presence of an Alternative Energy Source (AES). The privacy-power function is introduced to study the...

    Provided By CTTC

  • White Papers // Mar 2013

    An SDR Implementation of a Visible Light Communication System Based on the IEEE 802.15.7 Standard

    The aim of this paper is to present an implementation of a functional IEEE 802.15.7 real-time testbed based on the Software Defined Radio (SDR) concept. This implementation is built with low cost Commercial Off-The-Shelf (COTS) analog devices and the use of Universal Software Radio Peripheral version 2 (USRP2) equipment combined...

    Provided By CTTC

  • White Papers // Jan 2013

    Inter-Packet Encoding to Minimize Data Block Transfer Delay in Multipath Communications

    In this paper, the authors consider the use of inter-packet encoding at the source node to improve the delay performance of data block transmissions in a multipath communication scenario. First they propose a formal derivation to obtain the coding ratio and the per-path packet allocation that minimizes the data block...

    Provided By CTTC

  • White Papers // Apr 2013

    Modeling and Exploiting the Relation Between Packet Losses and Hidden Traffic

    Now-a-days, it is common to find multiple WLAN deployments coexisting in shared spaces. The resulting interference between transmissions represents an important source of performance degradation, especially those originating from hidden traffic. This note explores the relation between hidden traffic and packet losses, using renewal theory to show that losses constitute...

    Provided By CTTC

  • White Papers // Nov 2009

    Docitive Networks: A Novel Framework Beyond Cognition

    Multimedia applications require virtually zero-outage connectivity whilst being strictly delay-limited, prone to interference and bandwidth hungry. Among a gamut of technical solutions, cognitive radios and networks have long been perceived as a catalyst of above requirements by facilitating efficient primary/secondary multimedia user coexistence. The degree of coexistence heavily depends on...

    Provided By CTTC

  • White Papers // Mar 2009

    Testbed Implementation of Control Plane Extensions for Inter-Carrier GMPLS LSP Provisioning

    This paper presents a testbed implementation of an inter-carrier GMPLS (Generalized Multi Protocol Label Switching) service architecture recently proposed. This architecture couples the Path Computation Element (PCE)-based control plane with a service plane managing discovery, composition and activation functions of inter-carrier service elements. The testbed implements the required PCE Communication...

    Provided By CTTC

  • White Papers // Oct 2009

    Mixed TUSC and Band AMC Permutation Zone in OFDMA Systems With Limited Feedback

    In this paper a new permutation zone which combines adjacent and distributed subcarrier permutation is proposed for Orthogonal Frequency Division Multiple Access (OFDMA) systems. For such purpose two types of burst are defined: localized and distributed. A new resource allocation and scheduling algorithm that exploits such structure is then proposed....

    Provided By CTTC

  • White Papers // Mar 2009

    The Decoupling of DOA/Synchronization Parameters in Colored Noise Environments

    In the framework of antenna arrays, the authors show that the estimation of the synchronization parameters of the impinging signal (namely, time - delay and Doppler shift) is decoupled to the Direction Of Arrival estimation. They propose signal models for unstructured and structured arrays where the noise is considered Gaussian...

    Provided By CTTC