University of New York in Prague

Displaying 1-18 of 18 results

  • White Papers // Oct 2012

    Multi-Way Relay Networks: Orthogonal Uplink, Source-Channel Separation and Code Design

    The authors consider a multi-way relay network with an orthogonal uplink and correlated sources, and they characterize reliable communication (in the usual Shannon sense) with a single-letter expression. The characterization is obtained using a joint source-channel random-coding argument, which is based on a combination of Wyner et al.'s Cascaded Slepian-Wolf...

    Provided By University of New York in Prague

  • White Papers // Aug 2012

    Capacity Results for Two Classes of Three-Way Channels

    This paper considers the three-way channel, consisting of three nodes, where each node broadcasts a message to the two other nodes. The capacity of the finite-field three-way channel is derived, and is shown to be achievable using a non-cooperative scheme without feedback. The same scheme is also shown to achieve...

    Provided By University of New York in Prague

  • White Papers // Jul 2012

    On the Capacity of the Binary-Symmetric Parallel-Relay Network

    The authors investigate the binary-symmetric parallel-relay network where there is one source, one destination, and multiple relays in parallel. They show that forwarding relays, where the relays merely transmit their received signals, achieve the capacity in two ways: with coded transmission at the source and a finite number of relays,...

    Provided By University of New York in Prague

  • White Papers // Jul 2012

    On the Equal-Rate Capacity of the AWGN Multiway Relay Channel

    The L-user additive white Gaussian noise multi-way relay channel is investigated, where L users exchange information at the same rate through a single relay. A new achievable rate region, based on the functional-decode-forward coding strategy, is derived. For the case where there are three or more users, and all nodes...

    Provided By University of New York in Prague

  • White Papers // May 2012

    The Capacity Region of Restricted Multi-Way Relay Channels With Deterministic Uplinks

    This paper considers the Multi-Way Relay Channel (MWRC) where multiple users exchange messages via a single relay. The capacity region is derived for a special class of MWRCs where the uplink and the downlink are separated in the sense that there is no direct user-to-user links, the channel is restricted...

    Provided By University of New York in Prague

  • White Papers // May 2012

    Optimal Index Codes for a Class of Multicast Networks With Receiver Side Information

    This paper studies a special class of multicast index coding problems where a sender transmits messages to multiple receivers, each with some side information. Here, each receiver knows a unique message a priori, and there is no restriction on how many messages each receiver requests from the sender. For this...

    Provided By University of New York in Prague

  • White Papers // Oct 2011

    Joint Channel-Network Coding Strategies for Networks With Low Complexity Relays

    The authors investigate joint network and channel coding schemes for networks when relay nodes are not capable of performing channel coding operations. Rather, channel encoding is performed at the source node while channel decoding is done only at the destination nodes. They examine three different decoding strategies: independent network-then-channel decoding,...

    Provided By University of New York in Prague

  • White Papers // Aug 2011

    Implementation of Linear Model Predictive Control Using a Field Programmable Gate Array

    The paper investigates the design of a field programmable gate array based custom computer architecture solution for implementing model predictive control. The solution employs a primal logarithmic-barrier interior-point algorithm in order to handle actuator constraints. The solution also incorporates practical aspects of a control algorithm including state observation and data...

    Provided By University of New York in Prague

  • White Papers // Sep 2010

    Estimation of General Nonlinear State-Space Systems

    The field of linear dynamic system identification is by now quite mature. A comprehensive, unified and effective framework has been developed for understanding the various approaches which have proven effective. This involves noting the distinctions between model structure, estimation criterion, and employed algorithm. Central to this is the straightforward computability...

    Provided By University of New York in Prague

  • White Papers // Jul 2009

    Labour Market Flexibility In Estonia: What More Can Be Done?

    In mid-2008, high employment and low unemployment rates characterized the Estonian labor market in comparison with the average of the EU15 countries. While aggregate outcomes improved during 2000-07, large inequalities persisted across regions, ethnic groups, and workers with different skill levels. As Estonia entered recession in 2008, the unemployment rate...

    Provided By University of New York in Prague

  • White Papers // Jun 2009

    ASIC and FPGA Implementation Strategies for Model Predictive Control

    Model Predictive Control (MPC) techniques have recently enjoyed an upsurge of interest within the automatic control community, due to their ability to handle non-linear systems and constraints on allowable control inputs and system states. The essential idea underpinning the method is that a constrained optimisation problem is solved in order...

    Provided By University of New York in Prague

  • White Papers // Mar 2009

    Nonlinear Model Predictive Control of an Inverted Pendulum

    Non-linear Model Predictive Control (NMPC) is an attractive strategy for controlling complex systems. It has been used for decades within process control industries, because it offers good dynamic performance while ensuring operation within certain physical limits. This latter feature enables plant operators to run the plant near constraint boundaries, which...

    Provided By University of New York in Prague

  • White Papers // Feb 2009

    Enhanced Lattice-Reduction Aided Detection for MIMO Systems

    Lattice-Reduction-Aided Detection (LRAD) has been shown to considerably increase the performance of linear Multiple-Input Multiple-Output (MIMO) detection systems. In this paper, the authors show that conventional LRAD is inherently incompatible with the use of different modulation formats across transmit antennas or, more generally, the use of transmit power scaling. This...

    Provided By University of New York in Prague

  • White Papers // Dec 2008

    Performance and Complexity of Adaptive Lattice Reduction in Fading Channels

    Lattice-Reduction-Aided Detection (LRAD) has been shown to considerably increase the performance of linear Multiple-Input Multiple-Output (MIMO) detection systems. In previous work, the authors introduced Adaptive Lattice Reduction as a way to exploit channel correlation to yield lattice reduction-based detectors exhibiting considerably reduced complexity. In this paper, they review Adaptive Lattice...

    Provided By University of New York in Prague

  • White Papers // Sep 2008

    Turbo Equalization with Optimized Linearly Encodable LDPC Codes

    Turbo equalization is a joint iterative equalization and decoding technique known to produce superior performance for Inter-Symbol Interference (ISI) channel, comparing to non-iterative methods. The authors analyze turbo equalization that employs linearly encodable LDPC codes. The codes are irregular and their degree profiles are optimized in order to achieve capacity...

    Provided By University of New York in Prague

  • White Papers // Jun 2008

    A 4 X 4 FPGA-Based Wireless Testbed for LTE Applications

    The authors present early results from a 44 2.4GHz ISM band Multiple-Input Multiple-Output (MIMO) testbed developed at the University of Newcastle for over-the-air evaluation of MIMO algorithms. To provide maximum flexibility for development of 3GPP Long Term Evolution (LTE) algorithms, the testbed is designed around a Field-Programmable Gate Array (FPGA)....

    Provided By University of New York in Prague

  • White Papers // Apr 2008

    Burst Erasure Correcting LDPC Codes

    In this paper Low-Density Parity-Check (LDPC) codes are designed for burst erasure channels. Firstly, lower bounds for the maximum length erasure burst that can always be corrected with message-passing decoding are derived as a function of the parity-check matrix properties. The authors then show how parity-check matrices for burst erasure...

    Provided By University of New York in Prague

  • White Papers // Apr 2008

    Maximum Likelihood Estimation of State Space Models From Frequency Domain Data

    This paper addresses the problem of estimating linear time invariant models from observed frequency domain data. Here an emphasis is placed on deriving numerically robust and efficient methods that can reliably deal with high order models over wide bandwidths. This involves a novel application of the Expectation-Maximisation (EM) algorithm in...

    Provided By University of New York in Prague

  • White Papers // Sep 2008

    Turbo Equalization with Optimized Linearly Encodable LDPC Codes

    Turbo equalization is a joint iterative equalization and decoding technique known to produce superior performance for Inter-Symbol Interference (ISI) channel, comparing to non-iterative methods. The authors analyze turbo equalization that employs linearly encodable LDPC codes. The codes are irregular and their degree profiles are optimized in order to achieve capacity...

    Provided By University of New York in Prague

  • White Papers // Jul 2009

    Labour Market Flexibility In Estonia: What More Can Be Done?

    In mid-2008, high employment and low unemployment rates characterized the Estonian labor market in comparison with the average of the EU15 countries. While aggregate outcomes improved during 2000-07, large inequalities persisted across regions, ethnic groups, and workers with different skill levels. As Estonia entered recession in 2008, the unemployment rate...

    Provided By University of New York in Prague

  • White Papers // May 2012

    Optimal Index Codes for a Class of Multicast Networks With Receiver Side Information

    This paper studies a special class of multicast index coding problems where a sender transmits messages to multiple receivers, each with some side information. Here, each receiver knows a unique message a priori, and there is no restriction on how many messages each receiver requests from the sender. For this...

    Provided By University of New York in Prague

  • White Papers // Oct 2012

    Multi-Way Relay Networks: Orthogonal Uplink, Source-Channel Separation and Code Design

    The authors consider a multi-way relay network with an orthogonal uplink and correlated sources, and they characterize reliable communication (in the usual Shannon sense) with a single-letter expression. The characterization is obtained using a joint source-channel random-coding argument, which is based on a combination of Wyner et al.'s Cascaded Slepian-Wolf...

    Provided By University of New York in Prague

  • White Papers // Aug 2011

    Implementation of Linear Model Predictive Control Using a Field Programmable Gate Array

    The paper investigates the design of a field programmable gate array based custom computer architecture solution for implementing model predictive control. The solution employs a primal logarithmic-barrier interior-point algorithm in order to handle actuator constraints. The solution also incorporates practical aspects of a control algorithm including state observation and data...

    Provided By University of New York in Prague

  • White Papers // Oct 2011

    Joint Channel-Network Coding Strategies for Networks With Low Complexity Relays

    The authors investigate joint network and channel coding schemes for networks when relay nodes are not capable of performing channel coding operations. Rather, channel encoding is performed at the source node while channel decoding is done only at the destination nodes. They examine three different decoding strategies: independent network-then-channel decoding,...

    Provided By University of New York in Prague

  • White Papers // Sep 2010

    Estimation of General Nonlinear State-Space Systems

    The field of linear dynamic system identification is by now quite mature. A comprehensive, unified and effective framework has been developed for understanding the various approaches which have proven effective. This involves noting the distinctions between model structure, estimation criterion, and employed algorithm. Central to this is the straightforward computability...

    Provided By University of New York in Prague

  • White Papers // Jun 2009

    ASIC and FPGA Implementation Strategies for Model Predictive Control

    Model Predictive Control (MPC) techniques have recently enjoyed an upsurge of interest within the automatic control community, due to their ability to handle non-linear systems and constraints on allowable control inputs and system states. The essential idea underpinning the method is that a constrained optimisation problem is solved in order...

    Provided By University of New York in Prague

  • White Papers // Mar 2009

    Nonlinear Model Predictive Control of an Inverted Pendulum

    Non-linear Model Predictive Control (NMPC) is an attractive strategy for controlling complex systems. It has been used for decades within process control industries, because it offers good dynamic performance while ensuring operation within certain physical limits. This latter feature enables plant operators to run the plant near constraint boundaries, which...

    Provided By University of New York in Prague

  • White Papers // Feb 2009

    Enhanced Lattice-Reduction Aided Detection for MIMO Systems

    Lattice-Reduction-Aided Detection (LRAD) has been shown to considerably increase the performance of linear Multiple-Input Multiple-Output (MIMO) detection systems. In this paper, the authors show that conventional LRAD is inherently incompatible with the use of different modulation formats across transmit antennas or, more generally, the use of transmit power scaling. This...

    Provided By University of New York in Prague

  • White Papers // Apr 2008

    Burst Erasure Correcting LDPC Codes

    In this paper Low-Density Parity-Check (LDPC) codes are designed for burst erasure channels. Firstly, lower bounds for the maximum length erasure burst that can always be corrected with message-passing decoding are derived as a function of the parity-check matrix properties. The authors then show how parity-check matrices for burst erasure...

    Provided By University of New York in Prague

  • White Papers // Dec 2008

    Performance and Complexity of Adaptive Lattice Reduction in Fading Channels

    Lattice-Reduction-Aided Detection (LRAD) has been shown to considerably increase the performance of linear Multiple-Input Multiple-Output (MIMO) detection systems. In previous work, the authors introduced Adaptive Lattice Reduction as a way to exploit channel correlation to yield lattice reduction-based detectors exhibiting considerably reduced complexity. In this paper, they review Adaptive Lattice...

    Provided By University of New York in Prague

  • White Papers // Apr 2008

    Maximum Likelihood Estimation of State Space Models From Frequency Domain Data

    This paper addresses the problem of estimating linear time invariant models from observed frequency domain data. Here an emphasis is placed on deriving numerically robust and efficient methods that can reliably deal with high order models over wide bandwidths. This involves a novel application of the Expectation-Maximisation (EM) algorithm in...

    Provided By University of New York in Prague

  • White Papers // Jun 2008

    A 4 X 4 FPGA-Based Wireless Testbed for LTE Applications

    The authors present early results from a 44 2.4GHz ISM band Multiple-Input Multiple-Output (MIMO) testbed developed at the University of Newcastle for over-the-air evaluation of MIMO algorithms. To provide maximum flexibility for development of 3GPP Long Term Evolution (LTE) algorithms, the testbed is designed around a Field-Programmable Gate Array (FPGA)....

    Provided By University of New York in Prague

  • White Papers // Jul 2012

    On the Capacity of the Binary-Symmetric Parallel-Relay Network

    The authors investigate the binary-symmetric parallel-relay network where there is one source, one destination, and multiple relays in parallel. They show that forwarding relays, where the relays merely transmit their received signals, achieve the capacity in two ways: with coded transmission at the source and a finite number of relays,...

    Provided By University of New York in Prague

  • White Papers // Jul 2012

    On the Equal-Rate Capacity of the AWGN Multiway Relay Channel

    The L-user additive white Gaussian noise multi-way relay channel is investigated, where L users exchange information at the same rate through a single relay. A new achievable rate region, based on the functional-decode-forward coding strategy, is derived. For the case where there are three or more users, and all nodes...

    Provided By University of New York in Prague

  • White Papers // Aug 2012

    Capacity Results for Two Classes of Three-Way Channels

    This paper considers the three-way channel, consisting of three nodes, where each node broadcasts a message to the two other nodes. The capacity of the finite-field three-way channel is derived, and is shown to be achievable using a non-cooperative scheme without feedback. The same scheme is also shown to achieve...

    Provided By University of New York in Prague

  • White Papers // May 2012

    The Capacity Region of Restricted Multi-Way Relay Channels With Deterministic Uplinks

    This paper considers the Multi-Way Relay Channel (MWRC) where multiple users exchange messages via a single relay. The capacity region is derived for a special class of MWRCs where the uplink and the downlink are separated in the sense that there is no direct user-to-user links, the channel is restricted...

    Provided By University of New York in Prague