SupaTag

Displaying 1-15 of 15 results

  • White Papers // Jan 2013

    Bounds on the Second-Order Coding Rate of the MIMO Rayleigh Block-Fading Channel

    The channel capacity describes the maximal rate at which data exchange with vanishing error probability is possible, provided that the length of each codeword is allowed to grow without limit. By focusing on this asymptotic limit, the theory of information ignores the role of delay as an important parameter. Although...

    Provided By SupaTag

  • White Papers // Jul 2012

    Slow Admission and Power Control for Small Cell Networks Via Distributed Optimization

    Although small cell networks are environmentally friendly and can potentially improve the coverage and capacity of cellular layers, it is imperative to control the interference in such networks before overlaying them in a macrocell network on a large-scale basis. In recent work, the authors developed the joint admission and power...

    Provided By SupaTag

  • White Papers // May 2012

    A New Family of Low-Complexity Decodable STBCs for Four Transmit Antennas

    The need for low-complexity decodable STBCs is inevitable in the case of high-rate communications over MIMO systems employing a number of transmit antennas higher than two. The decoding complexity may be evaluated by different measures, namely the worst-case decoding complexity measure and the average decoding complexity measure. The worst-case decoding...

    Provided By SupaTag

  • White Papers // May 2012

    The Inter-Domain Hierarchy in Measured and Randomly Generated AS-Level Topologies

    Independent operator networks are called either Autonomous Systems (AS) or domains. Numerous studies based on complex measurement platforms have been carried out for over ten years now in order to discover the Internet topology on domain level. The routing realized by Border Gateway Protocol (BGP) is strongly influenced by commercial...

    Provided By SupaTag

  • White Papers // May 2012

    Complexity Reduction by Combining Time Reversal and IR-UWB

    In this paper, the authors deal with the problem of minimizing the complexity of an IR-UWB system by the introduction of Time-Reversal, under a power constraint and fixing a reachable performance in terms of BER. An approximate trade-off in the choice of the number of taps at the transmitter and...

    Provided By SupaTag

  • White Papers // May 2012

    Spectrum Allocation and Optimization in Femtocell Networks

    Two-tier femtocell networks have been shown to provide superior performance in terms of indoor user coverage and data rate as compared to conventional macrocellular networks. Nevertheless, when macrocells and femtocells share the whole spectrum, macrocellular communication links suffer severely from inter-tier interference, further exacerbated in dense femtocell network deployments. Therefore,...

    Provided By SupaTag

  • White Papers // Mar 2012

    Predistortion Performance Considering Peak to Average Power Ratio Reduction in OFDM Context

    Some recent communication systems like DVB-T2 standard set up a PAPR reduction technique followed by a linearization's one. So in such a scenario, the performance of the linearization is influenced undoubtedly by the PAPR reduction method. In this paper, the authors revisit the EVM metric and evaluate a closed form...

    Provided By SupaTag

  • White Papers // Mar 2012

    Distributed Power Allocation With SINR Constraints Using Trial and Error Learning

    In this paper, the authors address the problem of global transmit power minimization in a self-configuring network where radio devices are subject to operate at a minimum Signal to Interference plus Noise Ratio (SINR) level. They model the network as a parallel Gaussian interference channel and they introduce a fully...

    Provided By SupaTag

  • White Papers // Mar 2012

    Physical Layer Reliability Vs ARQ in MIMO Block-Fading Channels

    In today's wireless communication systems, Automatic Repeat reQuest (ARQ) is implemented at the MAC layer in order to retransmit packets that have been erroneously transmitted at the PHYsical (PHY) layer. Following a joint PHYMAC design, information provided by the ARQ scheme can be exploited at the PHY layer in order...

    Provided By SupaTag

  • White Papers // Mar 2012

    Access Control and Cell Association in Two-Tier Femtocell Networks

    Two-tier femtocell networks, which comprise macrocells underlaid with short range femtocells, are under intensive study due to their improved indoor coverage and data rate advantages as compared to conventional single-tier macrocellular networks. Nevertheless, the implementation of two-tier networks with universal frequency reuse causes severe cross-tier interference from the femtocells to...

    Provided By SupaTag

  • White Papers // Sep 2011

    On the Fluctuations of the Sinr at the Output of the Wiener Filter for Non Centered Channels: The Non Gaussian Case

    In the context of multidimensional signals, the linear Wiener receiver is frequently encountered in wireless communication and in array processing; it is in fact the linear receiver that achieves the lowest level of interference. In this contribution, the authors focus on the study of the associated Signal-to-Interference plus Noise Ratio...

    Provided By SupaTag

  • White Papers // May 2011

    Asymptotic Analysis of Double-Scattering Channels

    The authors consider a Multiple-Input Multiple-Output (MIMO) Multiple Access Channel (MAC), where the channel between each transmitter and the receiver is modeled by the doubly-scattering channel model. Based on novel techniques from random matrix theory, they derive deterministic approximations of the mutual information, the Signal-to-Noise-plus-Interference Ratio (SINR) at the output...

    Provided By SupaTag

  • White Papers // Feb 2011

    CLT for Eigen-Inference Methods in Cognitive Radios

    In this paper, the authors provide a central limit theorem for a consistent estimator of the population eigenvalues of a class of sample covariance matrices. An exact expression as well as an empirical and asymptotically accurate approximation of the limiting variance is also derived. These results are applied in a...

    Provided By SupaTag

  • White Papers // Jul 2010

    Joint Channel-Network Turbo Coding for the Non-Orthogonal Multiple Access Relay Channel

    In this paper, the authors investigate the benefit of Joint Network-Channel (JNC) distributed coding for the multiple-access half-duplex relay channel. In contrast with previous work, the medium access is not orthogonal and the source-to-relay links are not error-free, which render the reality of wireless environments and notably complicate the problem....

    Provided By SupaTag

  • White Papers // Feb 2010

    Information Theoretic Approach to Synchronization: The OFDM Carrier Frequency Offset Example

    In practical mobile communication systems, data-aided synchronization is performed before actual data exchanges, and synchronization methods are tailored to the pilot sequence. In this paper, the authors propose a framework for initial synchronization that works independently of the pilot sequence. They show that classical data-aided and blind techniques are particular...

    Provided By SupaTag

  • White Papers // Jul 2012

    Slow Admission and Power Control for Small Cell Networks Via Distributed Optimization

    Although small cell networks are environmentally friendly and can potentially improve the coverage and capacity of cellular layers, it is imperative to control the interference in such networks before overlaying them in a macrocell network on a large-scale basis. In recent work, the authors developed the joint admission and power...

    Provided By SupaTag

  • White Papers // May 2012

    The Inter-Domain Hierarchy in Measured and Randomly Generated AS-Level Topologies

    Independent operator networks are called either Autonomous Systems (AS) or domains. Numerous studies based on complex measurement platforms have been carried out for over ten years now in order to discover the Internet topology on domain level. The routing realized by Border Gateway Protocol (BGP) is strongly influenced by commercial...

    Provided By SupaTag

  • White Papers // May 2012

    A New Family of Low-Complexity Decodable STBCs for Four Transmit Antennas

    The need for low-complexity decodable STBCs is inevitable in the case of high-rate communications over MIMO systems employing a number of transmit antennas higher than two. The decoding complexity may be evaluated by different measures, namely the worst-case decoding complexity measure and the average decoding complexity measure. The worst-case decoding...

    Provided By SupaTag

  • White Papers // May 2012

    Complexity Reduction by Combining Time Reversal and IR-UWB

    In this paper, the authors deal with the problem of minimizing the complexity of an IR-UWB system by the introduction of Time-Reversal, under a power constraint and fixing a reachable performance in terms of BER. An approximate trade-off in the choice of the number of taps at the transmitter and...

    Provided By SupaTag

  • White Papers // Mar 2012

    Physical Layer Reliability Vs ARQ in MIMO Block-Fading Channels

    In today's wireless communication systems, Automatic Repeat reQuest (ARQ) is implemented at the MAC layer in order to retransmit packets that have been erroneously transmitted at the PHYsical (PHY) layer. Following a joint PHYMAC design, information provided by the ARQ scheme can be exploited at the PHY layer in order...

    Provided By SupaTag

  • White Papers // May 2012

    Spectrum Allocation and Optimization in Femtocell Networks

    Two-tier femtocell networks have been shown to provide superior performance in terms of indoor user coverage and data rate as compared to conventional macrocellular networks. Nevertheless, when macrocells and femtocells share the whole spectrum, macrocellular communication links suffer severely from inter-tier interference, further exacerbated in dense femtocell network deployments. Therefore,...

    Provided By SupaTag

  • White Papers // Mar 2012

    Distributed Power Allocation With SINR Constraints Using Trial and Error Learning

    In this paper, the authors address the problem of global transmit power minimization in a self-configuring network where radio devices are subject to operate at a minimum Signal to Interference plus Noise Ratio (SINR) level. They model the network as a parallel Gaussian interference channel and they introduce a fully...

    Provided By SupaTag

  • White Papers // Mar 2012

    Predistortion Performance Considering Peak to Average Power Ratio Reduction in OFDM Context

    Some recent communication systems like DVB-T2 standard set up a PAPR reduction technique followed by a linearization's one. So in such a scenario, the performance of the linearization is influenced undoubtedly by the PAPR reduction method. In this paper, the authors revisit the EVM metric and evaluate a closed form...

    Provided By SupaTag

  • White Papers // Mar 2012

    Access Control and Cell Association in Two-Tier Femtocell Networks

    Two-tier femtocell networks, which comprise macrocells underlaid with short range femtocells, are under intensive study due to their improved indoor coverage and data rate advantages as compared to conventional single-tier macrocellular networks. Nevertheless, the implementation of two-tier networks with universal frequency reuse causes severe cross-tier interference from the femtocells to...

    Provided By SupaTag

  • White Papers // Sep 2011

    On the Fluctuations of the Sinr at the Output of the Wiener Filter for Non Centered Channels: The Non Gaussian Case

    In the context of multidimensional signals, the linear Wiener receiver is frequently encountered in wireless communication and in array processing; it is in fact the linear receiver that achieves the lowest level of interference. In this contribution, the authors focus on the study of the associated Signal-to-Interference plus Noise Ratio...

    Provided By SupaTag

  • White Papers // Jan 2013

    Bounds on the Second-Order Coding Rate of the MIMO Rayleigh Block-Fading Channel

    The channel capacity describes the maximal rate at which data exchange with vanishing error probability is possible, provided that the length of each codeword is allowed to grow without limit. By focusing on this asymptotic limit, the theory of information ignores the role of delay as an important parameter. Although...

    Provided By SupaTag

  • White Papers // May 2011

    Asymptotic Analysis of Double-Scattering Channels

    The authors consider a Multiple-Input Multiple-Output (MIMO) Multiple Access Channel (MAC), where the channel between each transmitter and the receiver is modeled by the doubly-scattering channel model. Based on novel techniques from random matrix theory, they derive deterministic approximations of the mutual information, the Signal-to-Noise-plus-Interference Ratio (SINR) at the output...

    Provided By SupaTag

  • White Papers // Feb 2011

    CLT for Eigen-Inference Methods in Cognitive Radios

    In this paper, the authors provide a central limit theorem for a consistent estimator of the population eigenvalues of a class of sample covariance matrices. An exact expression as well as an empirical and asymptotically accurate approximation of the limiting variance is also derived. These results are applied in a...

    Provided By SupaTag

  • White Papers // Feb 2010

    Information Theoretic Approach to Synchronization: The OFDM Carrier Frequency Offset Example

    In practical mobile communication systems, data-aided synchronization is performed before actual data exchanges, and synchronization methods are tailored to the pilot sequence. In this paper, the authors propose a framework for initial synchronization that works independently of the pilot sequence. They show that classical data-aided and blind techniques are particular...

    Provided By SupaTag

  • White Papers // Jul 2010

    Joint Channel-Network Turbo Coding for the Non-Orthogonal Multiple Access Relay Channel

    In this paper, the authors investigate the benefit of Joint Network-Channel (JNC) distributed coding for the multiple-access half-duplex relay channel. In contrast with previous work, the medium access is not orthogonal and the source-to-relay links are not error-free, which render the reality of wireless environments and notably complicate the problem....

    Provided By SupaTag