University of South Florida

Displaying 1-40 of 126 results

  • White Papers // Jan 2014

    Implementation of an IEEE 802.11a Compliant Low-Power Baseband Processor

    Fourth Generation (4G) wireless and mobile systems are today very attractive for research and development. New types of services will be universally available to consumers and for industrial applications with the use of 4G devices. Broadband wireless networks will enable packet based high-speed data transfer suitable for video transmission and...

    Provided By University of South Florida

  • White Papers // Jan 2014

    A Dual-Mode Synchronous/Asynchronous CORDIC Processor

    Fourth Generation (4G) wireless and mobile systems are currently the focus of research and development. They will allow new types of services to be universally available to consumers and for industrial applications. For application in a software defined radio a CORDIC processor has been developed that can operate both in...

    Provided By University of South Florida

  • White Papers // Jan 2014

    Reducing the Energy Consumption in Fault-tolerant Distributed Embedded Systems with Time-Constraint

    In this paper, the authors address the problem of reducing the energy consumption in distributed embedded systems associated with time-constraints and equipped with fault-tolerant techniques. A greedy heuristic is presented to reduce the energy during task mapping and fault tolerance policy assignment. Fault tolerance is achieved through task re-execution and...

    Provided By University of South Florida

  • White Papers // Dec 2013

    An Improved Instruction-Level Power Model for ARM11 Microprocessor

    Low power consumption is becoming more and more important, because a lot of embedded systems use batteries as energy sources. To make a low power processor, a number of hardware techniques have been developed, such as clock gating and power gating. Software also affects the power consumption, but there is...

    Provided By University of South Florida

  • White Papers // Jun 2013

    Untainted Puncturing for Irregular Low-Density Parity-Check Codes

    Puncturing is a well-known coding technique widely used for constructing rate-compatible codes. In this paper, the authors consider the problem of puncturing low-density parity-check codes and propose a new algorithm for intentional puncturing. The algorithm is based on the puncturing of untainted symbols, i.e. nodes with no punctured symbols within...

    Provided By University of South Florida

  • White Papers // Jun 2013

    On the Viability of Using Liability to Incentivise Internet Security

    Internet use is characterized by externalities, which means that it can be sufficiently pro table for criminal enterprises to flourish. One possible mechanism which could be considered to improve incentives is liability. The authors conduct a review of the literature relating to liability theory, liability online, and security economics in...

    Provided By University of South Florida

  • White Papers // Mar 2013

    Real Time Controller Implementation for an Atomic Force Microscope Using a Digital Signal Processor

    The objective of this contribution is to report a low cost implementation of a control system for an Atomic Force Microscope (AFM). AFMs rely on a feedback controller as an integral part of their operation. Currently the controllers shipped with most commercial AFMs are implemented in a closed source manner...

    Provided By University of South Florida

  • White Papers // Mar 2013

    Maximizing Energy-Efficiency in Multi-Relay OFDMA Cellular Networks

    This contribution presents a method of obtaining the optimal power and subcarrier allocations that maximize the Energy-Efficiency (EE) of a multi-user, multi-relay, Orthogonal Frequency Division Multiple Access (OFDMA) cellular network. Initially, the Objective Function (OF) is formulated as the ratio of the Spectral-Efficiency (SE) over the power consumption of the...

    Provided By University of South Florida

  • White Papers // Mar 2013

    Cross-Layer Aided Energy-Efficient Opportunistic Routing in Ad Hoc Networks

    Most of the nodes in ad hoc networks rely on batteries, which requires energy saving. Hence, numerous energy-efficient routing algorithms have been proposed for solving this problem. In this paper, the authors exploit the benefits of cross-layer information exchange, such as the knowledge of the Frame Error Rate (FER) in...

    Provided By University of South Florida

  • White Papers // Feb 2013

    Generalized Adaptive Network Coding Aided Successive Relaying for Noncoherent Cooperation

    A Generalized Adaptive Network Coding (GANC) scheme is conceived for a multi-user, multi-relay scenario, where the multiple users transmit independent information streams to a common destination with the aid of multiple relays. The proposed GANC scheme is developed from Adaptive Network Coded Cooperation (ANCC), which aims for a high flexibility...

    Provided By University of South Florida

  • White Papers // Feb 2013

    MC-CDMA Aided Multi-User Space-Time Shift Keying in Wideband Channels

    In this paper, the authors propose Multi-Carrier Code Division Multiple Access (MC-CDMA)-aided Space-Time Shift Keying (STSK) for mitigating the performance erosion of the classic STSK scheme in dispersive channels, while supporting multiple users. The codewords generated by the STSK scheme are appropriately spread in Frequency-Domain (FD) and transmitted over a...

    Provided By University of South Florida

  • White Papers // Jan 2013

    Multilevel Generalized Low-Density Parity-Check Codes

    Multi-Level Coding (MLC) was proposed by Imai and Hirawaki as a bandwidth efficient coded modulation scheme designed for protecting each bit of a non-binary symbol with the aid of binary codes, while maintaining different target Bit Error Rates (BERs). Parallel Independent Decoding (PID) is employed as an efficient decoding strategy...

    Provided By University of South Florida

  • White Papers // Jan 2013

    Modelling Interactive Real-Time Applications on Service Oriented Infrastructures

    The European Commission supported IRMOS project is developing tools and techniques that allow real-time applications to be planned and executed on distributed Service Oriented Infrastructures (SOI) operated by third-party service providers. The exemplar applications within the project are all multimedia based and include support for interactive and collaborative film post-production,...

    Provided By University of South Florida

  • White Papers // Dec 2012

    Near-Capacity Joint Channel Estimation and Three-Stage Turbo Detection for MIMO Systems

    The authors propose a novel joint channel estimation and three-stage iterative detection/decoding scheme for near-capacity MIMO systems. In their scheme, as usual, the detected soft information is first exchanged a number of times within the inner turbo loop between the Unity-Rate-Code (URC) decoder and the MIMO soft-demapper, and the information...

    Provided By University of South Florida

  • White Papers // Nov 2012

    Iterative Detection and Decoding Using Approximate Bayesian Theorem Based PDA Method Over MIMO Nakagami-M Fading Channels

    In this paper, the design of Iterative Detection and Decoding (IDD) schemes relying on a low-complexity Probabilistic Data Association (PDA) aided method is conceived for turbo-coded Multiple-Input Multiple-Output (MIMO) systems communicating over Nakagami-m fading channels. The known PDA based MIMO detectors typically operate purely in the probability-domain. The authors show...

    Provided By University of South Florida

  • White Papers // Nov 2012

    Reduced-Complexity Soft STBC Detection

    Inspired by the scientific breakthrough of Turbo Codes (TCs) proposed, a near-capacity performance has been pursued by numerous researchers in diverse system contexts. However, as the researchers have inched closer and closer to the channel capacity, the complexity of the resultant communication systems was increased. The soft-decision aided MIMO detection...

    Provided By University of South Florida

  • White Papers // Oct 2012

    User Relay Assisted Traffic Shifting in LTE-Advanced Systems

    In order to deal with uneven load distribution, mobility load balancing adjusts the handover region to shift edge users from a hot-spot cell to the less-loaded neighbouring cells. However, shifted users suffer the reduced signal power from neighbouring cells, which may result in link quality degradation. This paper employs a...

    Provided By University of South Florida

  • White Papers // Sep 2012

    DS-CDMA With M-Ary Orthogonal Modulation for Wireless Sensor Networks Simultaneously Monitoring Multiple Events

    In this paper, the authors propose a novel WSN framework for one fusion center to monitor simultaneously multiple Source Events (SEs), each of which has multiple states. In the proposed WSN, every SE is observed by a range of local sensors, which convey their observations to the fusion center in...

    Provided By University of South Florida

  • White Papers // Aug 2012

    A Hybrid Artificial Immune System and Self Organising Map for Network Intrusion Detection

    Network intrusion detection is the problem of detecting unauthorized use of, or access to, computer systems over a network. Two broad approaches exist to tackle this problem: anomaly detection and misuse detection. An anomaly detection system is trained only on examples of normal connections, and thus has the potential to...

    Provided By University of South Florida

  • White Papers // Aug 2012

    Beyond the Hype: Cloud Computing in Analytics

    Machine learning (ML) techniques are becoming commonplace in business and research alike. With the automatization of data collection efforts, evermore data is being captured, rendering the task of extracting insightful patterns increasingly challenging. In addition to this "data avalanche" becoming ever more overwhelming, the usage of more computationally intensive algorithms...

    Provided By University of South Florida

  • White Papers // Jul 2012

    The Business Perspective of Cloud Computing for Small and Medium Enterprises

    Cloud computing has been described as a technological change brought about by the convergence of a number of new and existing technologies. It enables all businesses to get the best of technology at extremely economical costs. Both perspectives of the Cloud are important to be reviewed, of the provider's side...

    Provided By University of South Florida

  • White Papers // May 2012

    Reduced Feedback Links for Power Minimization in Distributed Multicell OFDMA Networks

    In the next generation of multicell networks, adaptive resource allocation techniques will play an important role to improve both quality of service and spectral efficiency. In order to employ distributed power allocation for multicell Orthogonal Frequency-Division Multiple Access (OFDMA) networks, the Channel State Information (CSI) belonging to all users is...

    Provided By University of South Florida

  • White Papers // May 2012

    First-Hop-Quality-Aware Dynamic Resource Allocation for Amplify-and-Forward Opportunistic Relaying Assisted SC-FDMA

    In this paper, the authors exploit the benefits of the diversity gains arising from a cluster of Opportunistic Relays (OR) and from the independently fading subcarriers of multiple users. Their goal is to improve the energy-efficiency of the OR assisted Single-Carrier Frequency-Division Multiple-Access (SC-FDMA) uplink using Amplify-and-Forward (AF), where the...

    Provided By University of South Florida

  • White Papers // May 2012

    Selective Relaying in Multi-Relay Networks With Feedback Delays and Adaptive Modulation

    This paper evaluates the performance of adaptive modulation in multi-relay networks with selective relaying, under Nakagami-m fading. In the system model, the source decides independently whether to forward the source message to the destination via the best (partial relay selection) relay path or direct path by comparing the end-to-end instantaneous...

    Provided By University of South Florida

  • White Papers // May 2012

    Relay Selection Schemes Relying on Adaptive Modulation and Imperfect Channel Knowledge for Cooperative Networks

    Cooperative MAC protocols have been shown to increase the attainable network throughput and to reduce the outage probability when perfect Channel State Information (CSI) is available either at the source station or at candidate relays. This paper investigates the realistically achievable network performance of relay selection schemes under imperfect CSI...

    Provided By University of South Florida

  • White Papers // May 2012

    Efficient Frequency Domain Packet Scheduler for Point-to-Multipoint Transmissions in LTE Networks

    Long Term Evolution (LTE) is the emerging 4G wireless technology developed to provide high quality services in mobile environments. It is foreseen that multimedia services and mobile TV will assume an important role for the LTE proliferation in mobile market. However, several issues are still open and meaningful improvements have...

    Provided By University of South Florida

  • White Papers // May 2012

    Efficient MIMO Antenna Evaluation Based on MIMO Spatial Channel Simulations

    This paper studies the proposal of using Spatial Channel Model (SCM) for the purpose of MIMO antenna parameter evaluation. The reason of choosing SCM is firstly explained. Then field measurements are conducted for comparison with simulations. The measurements have given preliminary proof to the applicability of the simulation method. To...

    Provided By University of South Florida

  • White Papers // May 2012

    A Novel Ergodic Capacity Analysis of Diversity Combining and Multihop Transmission Systems Over Generalized Composite Fading Channels

    Ergodic capacity is an important performance measure associated with reliable communication at the highest rate at which information can be sent over the channel with a negligible probability of error. In the shadow of this definition, diversity receivers (such as selection combining, equal-gain combining and maximal-ratio combining) and transmission techniques...

    Provided By University of South Florida

  • White Papers // May 2012

    Alternative Concepts of Antenna Deployment and Cell Layout in Mobile Communications

    Cellular communication systems have traditionally been designed according to the paradigm that base stations serve independent sectors for which inter-sector interference should be minimized. Further, multiple base stations serving multiple sectors are traditionally grouped into a minimum number of sites, in order to reuse infrastructure for cooling, battery backup etc....

    Provided By University of South Florida

  • White Papers // May 2012

    Truthful Auction for Cooperative Communications With Revenue Maximization

    Auction theory has been applied to cooperative communications to either efficiently allocate resources or incentivize wireless devices to participate in cooperative communications. However, a common shortcoming of the existing studies is that the revenue generation is neglected. Revenue generation is the ultimate goal of commercial networks, e.g., WiMAX networks. In...

    Provided By University of South Florida

  • White Papers // May 2012

    Characterizing Random CSMA Wireless Networks: A Stochastic Geometry Approach

    The authors characterize the random CSMA wireless networks by statistically quantifying the intensity of simultaneously active nodes and the aggregate interference experienced by a generic node in the network. First, starting from a Poisson point process to model the spatial distribution of the network nodes, they propose a Modified Hard...

    Provided By University of South Florida

  • White Papers // May 2012

    Modeling Random CSMA Wireless Networks in General Fading Environments

    Carrier-Sense Multiple Access (CSMA) protocols coordinate the spectrum access to maximize the spatial frequency reuse and minimize the mutual interference in distributed wireless networks. Since the CSMA protocol correlates the positions of the simultaneously active transmitters, the analytically tractable Poisson Point Process (PPP) cannot be used to model the spatial...

    Provided By University of South Florida

  • White Papers // May 2012

    MQBM: An Autonomic QoS Multicast Routing Protocol for Mobile Ad Hoc Networks

    Mobile Ad hoc NETwork (MANET) is a wireless network that consists of a large number of mobile and heterogeneous nodes interconnected by wireless links which move in an arbitrary direction with random velocity. It is characterized by the absence of any pre-existing infrastructure. This makes the transmission more difficult especially,...

    Provided By University of South Florida

  • White Papers // May 2012

    Iterative Two-Dimensional Error Concealment for Low-Complexity Wireless Video Uplink Transmitters

    Since joint source-channel decoding is capable of exploiting the residual redundancy in the encoded source signals for improving the attainable error resilience, it has attracted substantial attention. Motivated by the principle of exploiting the source redundancy at the receiver, in this treatise the authors paper the application of iterative Error...

    Provided By University of South Florida

  • White Papers // Mar 2012

    On Spatial Load Balancing In Wide-Area Wireless Networks

    Load Balancing is typically used in cellular wireless networks in the frequency domain to balance paging, access, and traffic load across the available bandwidth. In this paper, the authors extend the concept of Load Balancing to the Spatial domain. They develop two approaches - Network Load Balancing and Single-Carrier MultiLink...

    Provided By University of South Florida

  • White Papers // Mar 2012

    Channel Quantization for Physical Layer Network-Coded Two-Way Relaying

    The design of modulation schemes for the physical layer network-coded two way relaying scenario is considered with the protocol which employs two phases: Multiple access (MA) Phase and Broadcast (BC) phase. It was observed by Koike-Akino et al. that adaptively changing the network coding map used at the relay according...

    Provided By University of South Florida

  • White Papers // Jan 2012

    Feasibility of Face Animation on Mobile Phones for Deaf Users

    Mobile telephone systems have made a fantastic progress in general, but deaf people are practically excluded from the benefits of mobiles. The authors' aim was to develop a new communication aid for deaf users. Their system directly converts the audio speech signal into the video of animated face, so the...

    Provided By University of South Florida

  • White Papers // Jan 2012

    Model-Based Trace-Checking

    Trace analysis can be a useful way to discover problems in a program under test. Rather than writing a special purpose trace analysis tool, this paper proposes that traces can usefully be analyzed by checking them against a formal model using a standard model-checker or else an animator for executable...

    Provided By University of South Florida

  • White Papers // Nov 2011

    A Low-Complexity Turbo Decoder Architecture for Energy-Efficient Wireless Sensor Networks

    Turbo codes have recently been considered for energy-constrained wireless communication applications, since they facilitate a low transmission energy consumption. However, in order to reduce the overall energy consumption, Look-Up-Table-Log-BCJR (LUT-Log-BCJR) architectures having a low processing energy consumption are required. In this paper, the authors decompose the LUT-Log-BCJR architecture into its...

    Provided By University of South Florida

  • White Papers // Oct 2011

    Multihop Diversity - A Precious Source of Fading Mitigation in Multihop Wireless Networks

    The concept of multi-hop diversity is proposed, where all the nodes of a multi-hop link are assumed to have buffers for temporarily storing their received packets. During each time-slot, the best hop having, for example, the highest Signal-to-Noise Ratio (SNR), is selected from the set of those hops, where the...

    Provided By University of South Florida

  • White Papers // Mar 2012

    On Spatial Load Balancing In Wide-Area Wireless Networks

    Load Balancing is typically used in cellular wireless networks in the frequency domain to balance paging, access, and traffic load across the available bandwidth. In this paper, the authors extend the concept of Load Balancing to the Spatial domain. They develop two approaches - Network Load Balancing and Single-Carrier MultiLink...

    Provided By University of South Florida

  • White Papers // Dec 2010

    Broadband Proximity Fed Modified E-Shaped Microstrip Antenna

    Commonly used technique to realize broadband microstrip antenna is by cutting the slots at an appropriate position inside the patch. The slot introduces a mode near the fundamental mode of the patch and yields broadband response. The bandwidth of an E-shaped microstrip antenna is further increased by cutting the pair...

    Provided By University of South Florida

  • White Papers // Dec 2010

    Generation of 60 GHz AM-PM Millimeter-Wave Signal Optically

    A scheme for the optical generation and modulation of mm-wave signal is proposed. The components required for the proposed mm-wave generator are an optical pulse source, a WDM demultiplexer, optical modulators and a wideband photodiode. Two coherent lightwaves are selected from the optical pulse and are modulated and then heterodyned...

    Provided By University of South Florida

  • White Papers // Dec 2010

    Mutual Information with Filterbank Equalization for MIMO Frequency Selective Channels

    The use of multiple antennas at both the transmitter and receiver is well motivated by the substantial performance gains that can be realized, both in terms of an increase in achievable data rate and a decrease in error rate. The achievable data rate is characterized by the mutual information of...

    Provided By University of South Florida

  • White Papers // Dec 2010

    An ICI Reduction Scheme with Enhanced Frequency Diversity for OFDM Systems

    The authors analyze the frequency diversity of InterCarrier Interference (ICI) reduction methods in the presence of phase noise over multipath fading channels. Based on analysis, they propose an Enhanced Symmetric Data Conjugate (ESDC) method to exploit the frequency diversity in multipath fading channel. They derive Carrier-to-Interference Ratio (CIR) expression of...

    Provided By University of South Florida

  • White Papers // Nov 2010

    Exact Error Analysis for Decode and Forward Cooperation with Maximal Ratio Combining

    In this paper, the authors provide exact expressions for the Bit Error Rate (BER) for single relay Maximal Ratio Combining (MRC) based Decode and Forward (DF) cooperative systems in Nakagami-m fading. This is done by expressing the decision variable as a sum of gamma Conditionally Gaussian (CG) random variables. The...

    Provided By University of South Florida

  • White Papers // Jan 2009

    Three-Stage Concatenated Ultra-Wide Bandwidth Time-Hopping Spread-Spectrum Impulse Radio Using Iterative Detection

    The powerful tool of EXtrinsic Information Transfer (EXIT) charts is used to design a new serially concatenated Irregular Variable Length Coded (IrVLC) and unity-rate precoded Time-Hopping (TH) Pulse Position Modulation (PPM) aided Ultra-Wide Bandwidth (UWB) Spread-Spectrum (SS) impulse radio for near-capacity operation in Nakagami-m fading channels contaminated by Partial Band...

    Provided By University of South Florida

  • White Papers // Dec 2009

    A New Diagonally Layered Spatial Multiplexing Scheme With Limited Feedback

    Multiple-Input Multiple-Output (MIMO) wireless systems, employing multiple transmit and receive antennas, promise significant improvement in the capacity compared to conventional Single-Input Single-Output (SISO) systems. It was shown that the capacity of MIMO wireless systems increases linearly with the minimum of the number of antennas at the transmitter and receiver in...

    Provided By University of South Florida

  • White Papers // Dec 2009

    Receiver-Only Optimized Vector Quantization for Fading Channels

    This paper considers the design and analysis of a filter at the receiver of a source coding system to mitigate the excess distortion caused due to channel errors. The index output by the source encoder is sent over a fading discrete binary symmetric channel and the possibly incorrect received index...

    Provided By University of South Florida

  • White Papers // Jan 2012

    Feasibility of Face Animation on Mobile Phones for Deaf Users

    Mobile telephone systems have made a fantastic progress in general, but deaf people are practically excluded from the benefits of mobiles. The authors' aim was to develop a new communication aid for deaf users. Their system directly converts the audio speech signal into the video of animated face, so the...

    Provided By University of South Florida

  • White Papers // Jan 2012

    Model-Based Trace-Checking

    Trace analysis can be a useful way to discover problems in a program under test. Rather than writing a special purpose trace analysis tool, this paper proposes that traces can usefully be analyzed by checking them against a formal model using a standard model-checker or else an animator for executable...

    Provided By University of South Florida

  • White Papers // Sep 2008

    MIMO-OFDMA Measurements; Reception, Testing, and Evaluation of WiMAX-MIMO Signals With a Single Channel Receiver

    The number of MIMO-OFDMA systems is expected to increase sharply in the near future. Engineers who need to test these systems face two difficulties. First, the lack of descriptive instructions to conduct reliable measurements. Second, the increased hardware cost due to the need for multiple transmitters and receivers. This paper...

    Provided By University of South Florida

  • White Papers // Sep 2009

    Topology Maintenance: Extending the Lifetime of Wireless Sensor Networks

    Topology control is a well-known strategy to save energy and extend the lifetime of wireless sensor networks. In the literature, it is usually referred as the process that, given a set of nodes, builds a reduced topology that still guarantees connectivity and coverage. Here, the authors extend this definition. They...

    Provided By University of South Florida

  • White Papers // Aug 2008

    A3: A Topology Construction Algorithm for Wireless Sensor Networks

    Topology control is a well-known strategy to save energy and extend the lifetime of wireless sensor networks. This paper introduces the A3 (a tree) algorithm, a simple, distributed, and energy-efficient topology construction mechanism that finds a sub-optimal Connected Dominating Set (CDS) to turn unnecessary nodes off while keeping the network...

    Provided By University of South Florida

  • White Papers // Aug 2011

    Integrating Demand Response Capability into Smart Appliances: Design and Evaluation of Distributed Scheduling

    The need for a constant balance between power demand and supply, together with the lack of cost-effective solutions for storing electric energy, affects the efficiency of power grids and limits the integration of renewable sources. Dynamic pricing and demand response programs provide mechanisms to regulate the power demand according to...

    Provided By University of South Florida

  • White Papers // Oct 2010

    Using Coordinated Transmission With Energy Efficient Ethernet

    IEEE 802.3az Energy Efficient Ethernet (EEE) supports link active and sleep (idle) modes as a means of reducing the energy consumption of lightly utilized Ethernet links. A link wakes-up when an interface has packets to send and returns to idle when there are no packets. In this paper, the authors...

    Provided By University of South Florida

  • White Papers // Mar 2009

    A Data Link Layer in Support of Swarming of Autonomous Underwater Vehicles

    Swarms of Underwater Autonomous Vehicles (UAVs) are being increasingly used in civilian and military applications. Formations of UAVs are being utilized to detect mine-like objects and oilfields, collect water quality information, detect intruders, and in navigation assistance applications, among others. This paper introduces a new data link layer for underwater...

    Provided By University of South Florida

  • White Papers // Oct 2008

    On the Implementation of a Capacity Estimator for Wireless Ad Hoc Networks

    End-to-end capacity is a useful metric for network applications such as traffic engineering, QoS verification, peer-to-peer file distribution, video/audio streaming, admission control, etc. Although several tools have been developed to estimate end-to-end capacity and available bandwidth in wired networks, estimators for wireless ad-hoc networks are still to be developed. The...

    Provided By University of South Florida

  • White Papers // May 2012

    Reduced Feedback Links for Power Minimization in Distributed Multicell OFDMA Networks

    In the next generation of multicell networks, adaptive resource allocation techniques will play an important role to improve both quality of service and spectral efficiency. In order to employ distributed power allocation for multicell Orthogonal Frequency-Division Multiple Access (OFDMA) networks, the Channel State Information (CSI) belonging to all users is...

    Provided By University of South Florida

  • White Papers // May 2012

    First-Hop-Quality-Aware Dynamic Resource Allocation for Amplify-and-Forward Opportunistic Relaying Assisted SC-FDMA

    In this paper, the authors exploit the benefits of the diversity gains arising from a cluster of Opportunistic Relays (OR) and from the independently fading subcarriers of multiple users. Their goal is to improve the energy-efficiency of the OR assisted Single-Carrier Frequency-Division Multiple-Access (SC-FDMA) uplink using Amplify-and-Forward (AF), where the...

    Provided By University of South Florida

  • White Papers // May 2012

    Selective Relaying in Multi-Relay Networks With Feedback Delays and Adaptive Modulation

    This paper evaluates the performance of adaptive modulation in multi-relay networks with selective relaying, under Nakagami-m fading. In the system model, the source decides independently whether to forward the source message to the destination via the best (partial relay selection) relay path or direct path by comparing the end-to-end instantaneous...

    Provided By University of South Florida

  • White Papers // May 2012

    Relay Selection Schemes Relying on Adaptive Modulation and Imperfect Channel Knowledge for Cooperative Networks

    Cooperative MAC protocols have been shown to increase the attainable network throughput and to reduce the outage probability when perfect Channel State Information (CSI) is available either at the source station or at candidate relays. This paper investigates the realistically achievable network performance of relay selection schemes under imperfect CSI...

    Provided By University of South Florida

  • White Papers // May 2012

    Efficient Frequency Domain Packet Scheduler for Point-to-Multipoint Transmissions in LTE Networks

    Long Term Evolution (LTE) is the emerging 4G wireless technology developed to provide high quality services in mobile environments. It is foreseen that multimedia services and mobile TV will assume an important role for the LTE proliferation in mobile market. However, several issues are still open and meaningful improvements have...

    Provided By University of South Florida

  • White Papers // May 2012

    Efficient MIMO Antenna Evaluation Based on MIMO Spatial Channel Simulations

    This paper studies the proposal of using Spatial Channel Model (SCM) for the purpose of MIMO antenna parameter evaluation. The reason of choosing SCM is firstly explained. Then field measurements are conducted for comparison with simulations. The measurements have given preliminary proof to the applicability of the simulation method. To...

    Provided By University of South Florida

  • White Papers // May 2012

    A Novel Ergodic Capacity Analysis of Diversity Combining and Multihop Transmission Systems Over Generalized Composite Fading Channels

    Ergodic capacity is an important performance measure associated with reliable communication at the highest rate at which information can be sent over the channel with a negligible probability of error. In the shadow of this definition, diversity receivers (such as selection combining, equal-gain combining and maximal-ratio combining) and transmission techniques...

    Provided By University of South Florida

  • White Papers // May 2012

    Alternative Concepts of Antenna Deployment and Cell Layout in Mobile Communications

    Cellular communication systems have traditionally been designed according to the paradigm that base stations serve independent sectors for which inter-sector interference should be minimized. Further, multiple base stations serving multiple sectors are traditionally grouped into a minimum number of sites, in order to reuse infrastructure for cooling, battery backup etc....

    Provided By University of South Florida

  • White Papers // May 2012

    Truthful Auction for Cooperative Communications With Revenue Maximization

    Auction theory has been applied to cooperative communications to either efficiently allocate resources or incentivize wireless devices to participate in cooperative communications. However, a common shortcoming of the existing studies is that the revenue generation is neglected. Revenue generation is the ultimate goal of commercial networks, e.g., WiMAX networks. In...

    Provided By University of South Florida

  • White Papers // May 2012

    Characterizing Random CSMA Wireless Networks: A Stochastic Geometry Approach

    The authors characterize the random CSMA wireless networks by statistically quantifying the intensity of simultaneously active nodes and the aggregate interference experienced by a generic node in the network. First, starting from a Poisson point process to model the spatial distribution of the network nodes, they propose a Modified Hard...

    Provided By University of South Florida

  • White Papers // May 2012

    Modeling Random CSMA Wireless Networks in General Fading Environments

    Carrier-Sense Multiple Access (CSMA) protocols coordinate the spectrum access to maximize the spatial frequency reuse and minimize the mutual interference in distributed wireless networks. Since the CSMA protocol correlates the positions of the simultaneously active transmitters, the analytically tractable Poisson Point Process (PPP) cannot be used to model the spatial...

    Provided By University of South Florida

  • White Papers // May 2012

    MQBM: An Autonomic QoS Multicast Routing Protocol for Mobile Ad Hoc Networks

    Mobile Ad hoc NETwork (MANET) is a wireless network that consists of a large number of mobile and heterogeneous nodes interconnected by wireless links which move in an arbitrary direction with random velocity. It is characterized by the absence of any pre-existing infrastructure. This makes the transmission more difficult especially,...

    Provided By University of South Florida

  • White Papers // Mar 2012

    Channel Quantization for Physical Layer Network-Coded Two-Way Relaying

    The design of modulation schemes for the physical layer network-coded two way relaying scenario is considered with the protocol which employs two phases: Multiple access (MA) Phase and Broadcast (BC) phase. It was observed by Koike-Akino et al. that adaptively changing the network coding map used at the relay according...

    Provided By University of South Florida

  • White Papers // Apr 2010

    A View of Cloud Computing

    Cloud computing, the long-held dream of computing as a utility, has the potential to transform a large part of the IT industry, making software even more attractive as a service and shaping the way IT hardware is designed and purchased. Developers with innovative ideas for new Internet services no longer...

    Provided By University of South Florida

  • White Papers // Nov 2007

    Are Directors Necessary? The Case Of S&P 500 Index Mutual Funds

    The authors provide new evidence linking board characteristics and performance, using S&P 500 index mutual funds. First, funds with higher percentages of board directors who are sponsor officers experience higher returns and lower expenses. Second, in general returns and expense ratios are not impacted by board size, the proportion of...

    Provided By University of South Florida

  • White Papers // May 2008

    A Parallel Array to Accelerate GFA Modeling in Video Coding

    A novel video coding scheme based on the Generalized Finite Automata (GFA) modeling of video sequences in the bitplane wavelet domain has recently been proposed. This scheme was motivated by the fact that as emerging multimedia applications demand constant bit rate improvements, it became clear that H.264/AVC technology will not...

    Provided By University of South Florida

  • White Papers // Dec 2008

    Is The Credit Market Any Smarter Then The Equity Market, In The Aggregate, In Ability To Forward Forecast The Macro Economy? And Can We Still Use Them Together To Assess Whether Asset Prices Are Under Or Over Reacting Relative To The Macro Economy's Under

    The USA credit default concerns kept investors worldwide trying to interpret the implications for the American economy and its financial markets and institutions, in the mid and late 1970's, late 1980's and early 1990's, 2000s-2002 and most recently through 2007 and entering 2008. This raises an important question: does the...

    Provided By University of South Florida

  • White Papers // Sep 2008

    The Impact Of Stock Returns And Credit Ratings On Capital Structure

    The extensive history of capital structure research has yet to achieve consensus on the evolution of long-term financing for the firm, or the managerial motives behind the debt vs. equity issuance decision. The author examines two recent new directions in capital structure theory, works by Welch (2004) and Kisgen (2006)...

    Provided By University of South Florida

  • White Papers // Apr 2009

    A Tale Of Two Strategies: Cash Flow, Accruals And The Role Of Investor Sentiment

    This paper documents a subtle and counter-intuitive interaction between operating Cash FlOw (CFO) and accruals, and their association with future stock returns. While the two strategies should by construction capture similar anomalies, the authors find evidence in two large stock markets that they appear distinct, and that returns to these...

    Provided By University of South Florida

  • White Papers // Sep 2008

    Aggregate US Merger Levels: An Explained Markov Switching Analysis

    This paper adds to the current literature on the wave nature of the Mergers and Acquisitions time series in the United States. The authors aim to bridge the link between the macroeconomic theory of "Merger waves" and the econometric literature on modeling levels of merger activity. From economic theory they...

    Provided By University of South Florida

  • White Papers // Dec 2008

    Are All Inside Directors The Same? CEO Entrenchment Or Board Enhancement

    Two opposing theories currently exist concerning the role of inside directors on corporate boards. One theory emphasizes the moral hazard problem associated with CEO influence over officer-directors while the other theory emphasizes the valuable information-sharing role of inside directors. Both views treat inside directors as either homogenously beneficial or detrimental...

    Provided By University of South Florida

  • White Papers // Aug 2010

    Analysis of a Multi-Channel Receiver: Wireless and PLC Reception,

    In line with the trend in wireless communications, Power Line Communication (PLC) based systems recently draw considerable attention especially for wideband communication applications due to the advantages they offer. Parallel to the developments in communications and emergence of new concepts such as Cognitive Radio (CR), the ability to have access...

    Provided By University of South Florida