Institute of Electrical and Electronics Engineers

Displaying 281-320 of 8926 results

  • White Papers // Sep 2012

    Coupling Loss and Delay Differentiation to Enhance TCP Performance within Wireless Multi-hop Ad-hoc Networks

    Most existing TCP variants cannot distinguish between different packet loss causes within MANETs. TCP was, mainly, developed to deal with network congestion errors. While within MANETs, there are packet loss causes other than congestion. Studying the behavior of TCP in front of such losses, the authors notice that TCP doesn't...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Sep 2012

    Compressed Sensing of EEG for Wireless Telemonitoring With Low Energy Consumption and Inexpensive Hardware

    Telemonitoring of ElectroEncephaloGram (EEG) through wireless body-area networks is an evolving direction in personalized medicine. Among various constraints in designing such a system, three important constraints are energy consumption, data compression, and device cost. Conventional data compression methodologies, although effective in data compression, consumes significant energy and cannot reduce device...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Aug 2012

    A Solution Framework to Provide Management Services for Wireless Communications in the Digital Home

    The future Digital Home (DH) is envisioned as a place where a plethora of diverse personal and machine-to-machine communications will coexist to support different applications in areas such as information and entertainment, home automation, home health care and home security and management. Wireless technologies are usually the preferred solution to...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Aug 2012

    Dynamic Sensors Selection for Overlapped Multiple-Target Tracking Using Eagerness

    Efficient target tracking applications use active sensor nodes collaboratively to track multiple moving targets by balancing the trade-off between the quality of tracking and network's lifetime. In this paper, the authors propose a Low-Energy Dynamic Sensor selection (LEDS) scheme to track multiple targets by estimating energy consumption of sensors and...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Aug 2012

    Adaptive Bit Allocation in Rateless Coded MISO Downlink System with Limited Feedback

    Rateless coding is a new type of feed-forward incremental redundancy channel coding technique which can be incorporated with MIMO technology to exploit both the diversity and coding gain with possibly reduced channel feedback. In this paper, the benefits of limited feedback beamforming and rateless coding are investigated jointly in a...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Aug 2012

    Low-Latency Reweighted Belief Propagation Decoding for LDPC Codes

    In this paper, the authors propose a novel message passing algorithm which exploits the existence of short cycles to obtain performance gains by reweighting the factor graph. The proposed decoding algorithm is called Variable Factor Appearance Probability Belief Propagation (VFAP-BP) algorithm and is suitable for wireless communications applications with low-latency...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jul 2012

    An Adaptive Redundancy Scheme for TCP with Network Coding

    To address the inability of the standard TCP protocol to distinguish between congestive losses and random packet losses produced by the noisy channel, in this paper, the authors propose an adaptive algorithm to dynamically adjust the redundancy factor R of the TPC/NC protocol proposed by Sundararajan et al. by adding...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jul 2012

    On PMU Location Selection for Line Outage Detection in Wide-Area Transmission Networks

    The optimal PMU locations to collect voltage phase angle measurements for detecting line outages in wide-area transmission networks are investigated. The problem is established as one of maximizing the minimum distance among the voltage phase angle signatures of the outages, which can be equivalently formulated as an integer programming problem....

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jul 2012

    Joint Filter Design of Alternate MIMO AF Relaying Networks with Interference Alignment

    Wireless relaying systems have been recently considered an attractive option because of their potentials to improve the system throughput, enhance the cell-edge performance, extend cell coverage, and reduce the overall system deployment cost. As such they have been considered for the standardization of IEEE 802.16j, 16m and 3GPP LTE-Advanced. Most...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jul 2012

    Security in the Cloud: A Stake Holder's Perspective

    The cloud computing is a paradigm involving many disparate stake holders. Any system built upon this paradigm and a business run on such system architecture would have similarly disparate scope of access, activities and responsibilities for the stake holders. Depending on the scope of the activities and responsibilities, a stakeholder...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jul 2012

    Topological Transformation Approaches to TCAM-Based Packet Classification

    Several range re-encoding schemes have been proposed to mitigate the effect of range expansion and the limitations of small capacity, large power consumption, and high heat generation of Ternary Content Addressable Memory (TCAM)-based packet classification systems. However, they all disregard the semantics of classifiers and therefore miss significant opportunities for...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jul 2012

    A Fittingness Factor-based Spectrum Management Framework for Cognitive Radio Networks

    In order to increase CRs (Cognitive Radios) operation efficiency, there has been an increasing interest in strengthening awareness level about spectrum utilization. In this respect, this paper proposes to exploit the fittingness factor concept to capture the suitability of spectral resources exhibiting time-varying characteristics to support a set of heterogeneous...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jul 2012

    Cognitive Control Channels: from Concept to Identification of Implementation Options

    Recent effort related to cognitive radio systems has lead to an in-depth analysis of context information management and exploitation based on a cognitive control channel for enhancement of management needed for, say, suitable link selection in a heterogeneous radio framework, dynamic radio resource management, and distributed sensing. Concerning the actual...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2012

    On the Expressiveness of Business Process Modeling Notations for Software Requirements Elicitation

    Business process models have proved to be useful for requirements elicitation. Since software development depends on the quality of the requirements specifications, generating high-quality business process models is therefore critical. A key factor for achieving this is the expressiveness in terms of completeness and clarity of the modeling notation for...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2012

    A Measurement Study on Potential Inter-Domain Routing Diversity

    In response to Internet emergencies, Internet resiliency is investigated directly through an Autonomous System (AS) level graph inferred from policy-compliant BGP paths or/and traceroute paths. Due to policy-driven inter-domain routing, the physical connectivity does not necessarily imply network reachability in the AS-level graph, i.e., many physical paths are not visible...

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  • White Papers // Jun 2012

    Chip-Scale Photonic Architectures using Wavelength-Selective Spatial Routing for High-Performance Interconnection Networks

    Modern chip-scale computing system performance is increasingly becoming determined by the characteristics of the interconnection network. Photonic technology has been proposed as an alternative to traditional electronic interconnects for its advantages in bandwidth density, latency, and power efficiency. Circuit-switched photonic network architectures take advantage of the optical spectrum to create...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2012

    Hint-Based Execution of Workloads in Clouds With Nefeli

    Infrastructure-as-a-service clouds offer entire virtual infrastructures for distributed processing while concealing all physical underlying machinery. Current cloud interface abstractions restrict users from providing information regarding usage patterns of their requested Virtual Machines (VMs). In this paper, the authors propose Nefeli, a virtual infrastructure gateway that lifts this restriction. Through Nefeli,...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2012

    An IMU-Aided Carrier-Phase Differential GPS Positioning System

    The authors consider the problem of carrier-phase differential GPS positioning for an Land Vehicle Navigation System (LVNS), tightly coupled with an Inertial Measurement Unit (IMU) and a speedometer. The primary focus is to apply Bayesian network to an IMU-aided GPS positioning system based on carrier-phase differential GPS. They describe the...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2012

    Side-Channel Vulnerability Factor: A Metric for Measuring Information Leakage

    There have been many attacks that exploit side-effects of program execution to expose secret information and many proposed countermeasures to protect against these attacks. However there is currently no systematic, holistic methodology for understanding information leakage. As a result, it is not well known how design decisions affect information leakage...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2012

    Message Passing Algorithms and Improved LP Decoding

    Linear programming decoding for low-density parity check codes (and related domains such as compressed sensing) has received increased attention over recent years because of its practical performance - coming close to that of iterative decoding algorithms - and its amenability to finite-blocklength analysis. Several works starting with the work of...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2012

    Smart Transmitters and Receivers for Underwater Free-Space Optical Communication

    The number of unmanned vehicles and devices deployed underwater is increasing. New communication systems and networking protocols are required to handle this growth. Underwater free-space optical communication is poised to augment acoustic communication underwater, especially for short-range, mobile, multi-user environments in future underwater systems. Existing systems are typically point-to-point links...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2012

    Turbo Multi-User Detection for OFDM/SDMA Systems Relying on Differential Evolution Aided Iterative Channel Estimation

    A Differential Evolution (DE) algorithm aided iterative channel estimation and turbo Multi-User Detection (MUD) scheme is proposed for multi-user multi-input multiple output aided Orthogonal Frequency-Division Multiplexing/Space Division Multiple-Access (OFDM/SDMA) systems. The proposed scheme iteratively exchanges the estimated channel information and the detected data between the channel estimator and MUD employing...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2012

    Wireless Positioning Using TDS-OFDM Signals in Single-Frequency Networks

    Wireless positioning using Digital TeleVision (DTV) signals is a promising complementary to global positioning system due to high transmission power and wide coverage of DTV transmitters. Without changing the current infrastructure of Chinese DTV broadcasting network, this paper proposes a positioning scheme using Time-Domain Synchronous (TDS) Orthogonal Frequency Division Multiplexing...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2012

    Enhancement Through Cognitive Radio and Spectrum Sharing Principles

    Wireless communications technologies play an irreplaceable role in emergency and disaster relief situations. It is generally acknowledged that the existing public safety (PS) wireless communications facilities frequently fall short of meeting users' needs in many critical situations. Emergency scenarios usually lead to exceptionally high traffic loads, and the lack of...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2012

    Cloud Security Issues

    In past three decades, the world of computation has changed from centralized (client-server not web-based) to distributed systems and now the authors are getting back to the virtual centralization (Cloud Computing). Location of data and processes makes the difference in the realm of computation. On one hand, an individual has...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2012

    A Flexible and Efficient Alert Correlation Platform for Distributed IDS

    Intrusion Detection Systems (IDS) have been widely deployed in practice for detecting malicious behavior on network communication and hosts. The problem of false-positive alerts is a popular existing problem for most of IDS approaches. The solution to address this problem is correlation and clustering of alerts. To meet the practical...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2012

    Precoding for Word Error Rate Minimization of LDPC Coded Modulation on Block Fading Channels

    In wireless communications, the Block Fading (BF) channel is an important channel model. A key quality indicator in coded transmission is the Word Error Rate (WER), which is the fraction of packets that cannot be decoded correctly at the receiver. The authors study Low-Density Parity-Check (LDPC) coded modulation with pre-coding,...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2012

    Firewall Fingerprinting

    Firewalls are critical security devices handling all traffic in and out of a network. Firewalls, like other software and hardware network devices, have vulnerabilities, which can be exploited by motivated attackers. However, because firewalls are usually placed in the network such that they are transparent to the end users, it...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2012

    Efficient Anonymous Message Submission

    In online surveys, many people are not willing to provide true answers due to privacy concerns. Thus, anonymity is important for online message collection. Existing solutions let each member blindly shuffle the submitted messages by using the IND-CCA2 secure cryptosystem. In the end, all messages are randomly shuffled and no...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2012

    A Universal Space-Time Architecture for Multiple-Antenna Aided Systems

    Against the recent background of rapidly-increasing demand for high-speed multimedia wireless transceivers communicating over dispersive fading channels, a bandwidth efficient and reliable transmission technology is desired. Multiple-Input Multiple-Output (MIMO) techniques constitute promising solutions, where multiple Antenna Elements (AEs) are employed at a transmitter and/or a receiver in conjunction with appropriate...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2012

    MIMO-Aided Near-Capacity Turbo Transceivers: Taxonomy and Performance Versus Complexity

    In this paper, the authors firstly review the associated Multiple-Input Multiple-Output (MIMO) system theory and review the family of hard-decision and soft-decision based detection algorithms in the context of Spatial Division Multiplexing (SDM) systems. Their discussions culminate in the introduction of a range of powerful novel MIMO detectors, such as...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2012

    CAPRI: Prediction of Compaction-Adequacy for Handling Control-Divergence in GPGPU Architectures

    Wide SIMD-based GPUs have evolved into a promising platform for running general purpose workloads. Current programmable GPUs allow even code with irregular control to execute well on their SIMD pipelines. To do this, each SIMD lane is considered to execute a logical thread where hardware ensures that control flow is...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2012

    An Empirical Phase-Noise Model for MEMS Oscillators Operating in Nonlinear Regime

    Non-linearity of a silicon resonator can lead to improved phase-noise performance in an oscillator when the phase shift of the sustaining amplifier forces the operating point to a steeper phase-frequency slope. As a result, phase modulation on the oscillator frequency is minimized because the resonator behaves as a high-order phase...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2012

    Cooperative Communication Aware Link Scheduling for Cognitive Vehicular Networks

    Throughput maximization is a key challenge for wireless applications in Cognitive Vehicular Ad-hoc NETworks (CVANETs). As a potential solution, cooperative communications, which may increase link capacity by exploiting spatial diversity, has attracted a lot of attention in recent years. However, if link scheduling is considered, this transmission mode may perform...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2012

    On Maximizing Delay-Constrained Coverage of Urban Vehicular Networks

    The success of a real-time sensing application with a vehicular network highly depends on the spatiotemporal coverage of sensing data that can be collected from the vehicular network. Deploying broadband wireless base stations is an effective way to collect vehicular sensing data and the deployment of base stations has a...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2012

    Position-Based Modeling for Wireless Channel on High-Speed Railway Under a Viaduct at 2.35 GHz

    In this paper, the authors present a novel and practical study on the position-based radio propagation channel for High-Speed Railway by performing extensive measurements at 2.35 GHz in China. The specification on the path loss model is developed. In particular, small scale fading properties such as K-factor, Doppler frequency feature...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    Security in Tele-Lab - Protecting an Online Virtual Lab for Security Training

    The rapid burst of Internet usage and the corresponding growth of security risks and online attacks for the everyday user or the enterprise employee have emerged the terms awareness creation and information security culture. Nevertheless, security education widely has remained an academic issue. Teaching system or network security on the...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    On the Diversity Order and Coding Gain of Multi - SourceMulti - Relay Cooperative Wireless Networks With Binary Network Coding

    In this paper, a multi - source multi - relay cooperative wireless network with binary modulation and binary network coding is studied. The system model encompasses: a demodulate - and - forward protocol at the relays, where the received packets are forwarded regardless of their reliability; and a maximum -...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    Gaussian Approximation for the Wireless Multi-Access Interference Distribution and Its Applications

    This paper investigates the problem of Gaussian approximation for the wireless multi-access interference distribution in large spatial wireless networks. First, a principled methodology is presented to establish rates of convergence of the multi-access interference distribution to a Gaussian distribution for general bounded and power-law decaying path-loss functions. The model is...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    Diversity Loss Due to Interference Correlation

    Interference in wireless systems is both temporally and spatially correlated. Yet very little research has analyzed the effect of such correlation. Here the authors focus on its impact on the diversity in Poisson networks with multi-antenna receivers. Most work on multi-antenna communication does not consider interference, and if it is...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jan 2012

    Energy Efficient OFDMA: Trade-Off Between Computation and Transmission Energy

    The authors study minimization of overall energy consumption of OFDMA systems, which are widely adopted in future wireless communications. Based on the existing resource allocation to minimize transmission energy, the computation energy increases due to the complexity of allocating algorithms. Since, high performance algorithms usually have high complexity, there exist...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Large Families of Asymptotically Optimal Two-Dimensional Optical Orthogonal Codes

    Nine new 2-D OOCs are presented here, all sharing the common feature of a code size that is much larger in relation to the number of time slots than those of constructions appearing previously in the literature. Each of these constructions is either optimal or asymptotically optimal with respect to...

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  • White Papers // Sep 2010

    From Opportunistic Networks to Opportunistic Computing

    Personal computing devices, such as smartphones and PDAs, are commonplace, bundle several wireless network interfaces, can support compute intensive tasks, and are equipped with powerful means to produce multimedia content. Thus, they provide the resources for what the authors envision as a human pervasive network: a network formed by user...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2011

    A Delay-Centric Dynamic Resource Allocation Algorithm for Wireless Communication Systems Based on HNN

    This paper proposes a Dynamic Resource Allocation (DRA) algorithm for packet data services in wireless communication systems based on Hopfield Neural Networks (HNN). The resource allocation algorithm assumes a delay-centric approach in that it maximizes resource utilization of the overall system while minimizing the packet delay. The real-time working capability...

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  • White Papers // Jun 2011

    User Bandwidth Usage - Driven HNN Neuron Excitation Method for Maximum Resource Utilization Within Packet - Switched Communication Networks

    Mobile and wireless systems beyond 3G are being designed under the user-centric paradigm. Dynamic Resource Allocation (DRA) is a topic on intensive research to address efficiently such paradigm. Hopfield Neural Networks (HNN) have proved useful in the past to solve this kind of complex optimization problems. Recently, various approaches have...

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  • White Papers // Jun 2011

    Analysis and Validation of a Shadowing Simulation Model Suited for Dynamic and Heterogeneous Wireless Networks

    Complete shadowing modelling is one of the key issues when performing system level simulation of wireless networks. So far, models have been defined considering fixed antenna heights and a cellular deployment of base stations over roofs. However in multi-hop networks, like vehicle-to-vehicle systems, mobile equipments can be in constant three-dimensional...

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  • White Papers // Jun 2011

    Mobile Terminal Session SIR Prediction Method Based on Clustering and Classification Algorithms

    In this paper, a novel method for mobile terminal session Signal to Interference Ratio (SIR) prediction is presented. The method is based on clustering and classification algorithms configuring a fully-automatic process, highly adaptable to the deployment scenario. It is focused on the prediction of the session SIR probability density function...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2011

    MAC Layer Performance of Different Channel Estimation Techniques in UTRAN LTE Downlink

    Long Term Evolution (LTE) is the new standard proposed by the 3GPP to evolve towards 4G. Evolved UTRAN (E-UTRAN) specifications are currently completed and research groups are studying the performance of the last Release 8. Nevertheless, these studies lack of a full modeling of the MAC layer because they either...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2011

    Complete Shadowing Modeling and Its Effect on System Level Performance Evaluation

    Computer simulations are a common procedure for assessing the performance of new algorithms. To conduct a valid and accurate study, the models employed in such simulators need to be carefully selected. Regarding shadowing modeling, one-dimensional models are fairly commonplace in the literature. While simple and with low computational costs, these...

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  • White Papers // Jun 2011

    Joint Dynamic Resource Allocation for Coupled Heterogeneous Wireless Networks Based on Hopfield Neural Networks

    This paper proposes an algorithm to solve the problem of Joint Dynamic Resource Allocation in heterogeneous wireless networks. The algorithm is based on Hopfield Neural Networks to achieve fast and suboptimal solutions. The generic formulation is particularized and evaluated in an HSDPA and 802.11e WLAN coupled networks. Some illustrative simulations...

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  • White Papers // Dec 2011

    QoS-Aware Load Balancing in 3GPP Long Term Evolution Multi-Cell Networks

    In this paper, the authors investigate load balancing problem in 3GPP Long Term Evolution (LTE) network. Since LTE network aims to serve heterogeneous users with different Quality of Service (QoS) requirements, the influence of load imbalance is quite different. For those users with minimum rate requirements, it may result in...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Dec 2011

    On the Diagonal Distribution of a Complex Wishart Matrix and Its Application to the Analysis of MIMO Systems

    The statistical properties of Wishart matrices have been extensively used to analyze the performance of Multiple-Input Multiple-Output (MIMO) systems. In particular, the Signal-to-Noise Ratio (SNR) output statistics of several MIMO systems depends on the diagonal distribution of a complex Wishart matrix. In this paper, the authors derive the joint density...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2010

    Outage Probability Analysis for Nakagami-q (Hoyt) Fading Channels Under Rayleigh Interference

    Exact closed-form expressions are obtained for the outage probability of Nakagami-q (Hoyt) fading channels under Co-Channel Interference (CCI). The scenario considered in this work assumes the joint presence of background white Gaussian noise and independent Rayleigh interferers with arbitrary powers. Outage probability is a key performance metric of wireless communication...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2011

    Minimum Rate Guaranteed Call Admission Control for Cumulative Rate Distribution Based Scheduling

    In this paper, the authors investigate Call Admission Control (CAC) for Cumulative rate distribution based Scheduling (CS) in wireless communication networks. They first analyze the Multiuser Diversity Gain (MDG) of CS, which is applicable to general channel conditions. Then, they propose the minimum rate guaranteed CS/ORR based CAC algorithm, COCAC,...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jan 2012

    An Analysis of Requirements to Supporting Mobility in Body Area Networks

    Body Area Networks (BANs) form a strongly growing research field, motivated by increasing need for remote and improved patient healthcare solutions and driven by the development of the IEEE 802.15.6 standard. While most research focuses on single hop star topologies, more studies point towards multi-hop topologies as more preferable. Related...

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  • White Papers // Oct 2011

    An Analytical Model to Study the Impact of Time-Varying Cell Capacity in LTE Networks

    Contemporary wireless networks like Long Term Evolution (LTE) employ a technique called Adaptive Modulation and Coding (AMC) to enhance the throughput of the users in the system. Applying AMC, however, causes the total cell capacity to vary over time as sessions are started and stopped and users move around. The...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Sep 2012

    Nanoelectronic Solutions for Hardware Security

    Information security has emerged as an important system and application metric. Classical security solutions use algorithmic mechanisms that address a small subset of emerging security requirements, often at high energy and performance overhead. Further, emerging side channel and physical attacks can compromise classical security solutions. Hardware based security solutions overcome...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2012

    An Empirical Phase-Noise Model for MEMS Oscillators Operating in Nonlinear Regime

    Non-linearity of a silicon resonator can lead to improved phase-noise performance in an oscillator when the phase shift of the sustaining amplifier forces the operating point to a steeper phase-frequency slope. As a result, phase modulation on the oscillator frequency is minimized because the resonator behaves as a high-order phase...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Oct 2012

    Metameric Modulation for Diffuse Visible Light Communications with Constant Ambient Lighting

    Advances in solid-state lighting are renewing interest in the adoption of the visible spectrum for optical wireless communications. Under the luminaire-as-transmitter model, wireless communication is achieved by modulating LED(s) that must simultaneously meet the illumination mission. Illumination requirements include maintaining energy efficiency, constant color and intensity control whereas communications requirements...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Aug 2011

    Modeling and Designing of a New Indoor Free Space Visible Light Communication System

    Recent developments in solid-state Light-Emitting Diode (LED) materials and devices is driving a resurgence into the use of Free-Space Optics (FSO) for wireless broadband communication. This technology uses the visible spectrum provided by "White" LEDs that are becoming ubiquitous in lighting and has some desirable properties competitive with existing Radio...

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  • White Papers // May 2010

    Directional Communication System for Short-Range Vehicular Communications

    Improving safety in vehicles is achieved today by improving their ability to perceive and react to threats in the environment. Much effort is directed towards increasing the safety envelope around each vehicle with the introduction of increasingly sophisticated sensor technology (e.g., ultrasound, video, thermal imaging, and LIDAR). This envelope can...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2010

    Spotlighting for Visible Light Communications and Illumination

    The trend toward solid state lighting with white LEDs has motivated much research for using these devices to provide wireless broadband data communications. Much work in this area has attempted to fit VLC into currently dominant indoor lighting modes. In this paper the authors explore spotlighting, which is appropriate lighting...

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  • White Papers // Oct 2012

    LAT Indoor MIMO-VLC

    Visible Light Communications (VLC) is an innovative technology that uses the visible spectrum for high-speed data communications. In this paper the authors investigate the use of MIMO in the design of luminaires supporting VLC and, specifically, in enabling localization and high data rate services. Localization and transmission appear as two...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2011

    Space Shift Keying (SSK) MIMO with Practical Channel Estimates

    In this paper, the authors study the performance of space modulation for Multiple-Input-Multiple-Output (MIMO) wireless systems with imperfect channel knowledge at the receiver. They focus their attention on two transmission technologies, which are the building blocks of space modulation: Space Shift Keying (SSK) modulation; and Time-Orthogonal - Signal-Design (TOSD -)...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jan 2012

    Bit Error Probability of Spatial Modulation (SM) MIMO Over Generalized Fading Channels

    In this paper, the authors study the performance of Spatial Modulation (SM) Multiple-Input - Multiple-Output (MIMO) wireless systems over generic fading channels. More precisely, a comprehensive analytical framework to compute the Average Bit Error Probability (ABEP) is introduced, which can be used for any MIMO setups, for arbitrary correlated fading...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    Clipping Noise in OFDM-Based Optical Wireless Communication Systems

    In this paper, the impact of clipping noise on Optical Wireless Communication (OWC) systems employing Orthogonal Frequency Division Multiplexing (OFDM) is investigated. The two existing Optical OFDM (O-OFDM) transmission schemes, Asymmetrically Clipped Optical OFDM (ACO-OFDM) and Direct Current-biased Optical OFDM (DCO-OFDM), are studied. Time domain signal clipping generally results from...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Usage Behavior of a Large-Scale Scientific Archive

    Archival storage systems for scientific data have been growing in both size and relevance over the past two decades, yet researchers and system designers alike must rely on limited and obsolete knowledge to guide archival management and design. To address this issue, the authors analyzed three years of file-level activities...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Oct 2008

    A DCCP Congestion Control Mechanism for Wired-cum-Wireless Environments

    Existing transport protocols, be it TCP, SCTP or DCCP, do not provide an efficient congestion control mechanism for heterogeneous wired-cum-wireless networks. Solutions involving implicit loss discrimination schemes have been proposed but were never implemented. Appropriate mechanisms can dramatically improve bandwidth usage over the Internet, especially for multimedia transport based on...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2011

    Object-Based SCM: An Efficient Interface for Storage Class Memories

    Storage Class Memory (SCM) has become increasingly popular in enterprise systems as well as embedded and mobile systems. However, replacing hard drives with SCMs in current storage systems often forces either major changes in file systems or suboptimal performance, because the current block-based interface does not deliver enough information to...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2009

    A Single-Symbol-Decodable Space-Time Block Code with Full Rate and Low Peak-to-Average Power Ratio

    Three desirable properties of a four-antenna space-time block code are full rate, full diversity, and single-symbol decodability. Previously reported space-time codes that achieve all three properties do so at the expense of the Peak-to-Average Power Ratio (PAPR). A fourth desirable property of a space-time block code is that its PAPR...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Feb 2009

    On the Approximation of the Generalized-K PDF by a Gamma PDF Using the Moment Matching Method

    Using the Nakagami Probability Density Function (PDF) to model multipath fading and the Gamma PDF to model shadowing, in a wireless channel, has led to a closed-form expression for the composite fading PDF, known as the generalized-K PDF (also called Gamma-Gamma PDF). However, further derivations have shown that the Cumulative...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Feb 2009

    Analysis of Carrier Sensing's Influence on the Performance of Routing Protocols in Multi-Hop, Multi-Rate Wireless Networks

    Carrier sensing has been used as an effective way to reduce collisions and exploit spatial reuse in wireless networks. Previous research has attempted to tune the carrier sensing range to maximize the network throughput. However, the impact of carrier sensing threshold on the probability of successful transmission has been ignored....

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  • White Papers // Feb 2009

    Distributed Interference-Aware Scheduling Schemes for High-Density WLAN

    The increasing density of WLAN devices induces severe inter-cell interference problem in now-a-days WLAN system. The traditional Distributed Coordination Function (DCF) mechanism in IEEE 802.11 protocol was designed for the avoidance of intra-cell collision, but the inter-cell interference cannot be alleviated by merely increasing the backoff time. Multi-cell scheduling mechanism...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Feb 2009

    Improved Beamforming for Radio Links with Multi-Level Linearly Modulated Signals

    Multiple constellations have been proposed recently as a way of improving the system performance when used in conjunction with Orthogonal Transmit Diversity (OTD) for high level linear modulation schemes. This paper considers the use of multiple constellations in Multiple Input Multiple Output (MIMO) antenna systems. The premise is that the...

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  • White Papers // Feb 2009

    A Novel Network-Coding-Based Coded Cooperation Scheme

    Coded Cooperation (CC) is a promising user cooperation scheme. In this paper, the authors propose a novel network-coding-based coded cooperation scheme. When a user decodes its partner's information correctly in the first frame, it transmits the combination of the partner's parity bits and its own parity bits through network coding...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Feb 2009

    A Queueing Model for Wireless Tandem Network Coding

    In this paper, the authors propose a new analytical model in order to evaluate the throughput of a wireless tandem network coding. Their analytical model is based on a multi-class open queuing network. In this model, they include two basic processes of network coding, i.e., packets combination and packets multicasting,...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Feb 2009

    A TH-UWB Receiver With Near-MUD Performance for Multiple Access Interference Environments

    The Multiple Access Interference (MAI) in a Time-Hopping (TH) Ultra-WideBand (UWB) system is known to be non-Gaussian even when the system has a moderately large number of active users. Therefore, the Conventional Matched Filter (CMF) receiver, the optimal structure for Gaussian noise which maximizes the Signal-to-Noise Ratio (SNR) and minimizes...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Feb 2009

    Pollution Attack: A New Attack Against Localization in Wireless Sensor Networks

    Many secure localization algorithms have been proposed. In these algorithms, collusion attack is usually considered as the strongest attack when evaluating their performance. Also, for ensuring correct localization under the collusion attack, a necessary number of normal beacons are needed and a lower bound on this number has been established...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Feb 2009

    Cooperative Diversity over Fading Channels with Impulsive Noise

    Although there already exists a rich literature on cooperative diversity, current results are mainly restricted to the conventional assumption of Additive White Gaussian Noise (AWGN). AWGN model realistically represents the thermal noise at the receiver, but ignores the impulsive nature of atmospheric noise, electromagnetic interference, or man-made noise which might...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Feb 2009

    Design and Implementation of a Reconfigurable Decimation and Channel Selection Filter for GSM and UMTS Radio Standards

    In this paper, the authors present a low-power multi-standard decimation and channel selection filter architecture. The filter is suitable after an over-sampling sigma-delta converter and performs decimation in two stages. The first stage is a modified structure of the Cascade of Integrators-Combs (CIC) filter and allows reducing sampling rate downto...

    Provided By Institute of Electrical and Electronics Engineers