Institute of Electrical & Electronic Engineers

Displaying 1-40 of 9552 results

  • White Papers // Apr 2015

    Supervised Learning Based Model for Predicting Variability-Induced Timing Errors

    Circuit designers typically combat variations in hardware and workload by increasing conservative guardbanding that leads to operational inefficiency. Reducing this excessive guardband is highly desirable, but causes timing errors in synchronous circuits. The authors propose a methodology for supervised learning based models to predict timing errors at bit-level. They show...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Apr 2015

    Controlled-Channel Attacks: Deterministic Side Channels for Untrusted Operating Systems

    The presence of large numbers of security vulnerabilities in popular feature-rich commodity operating systems has inspired a long line of work on excluding these operating systems from the trusted computing base of applications, while retaining many of their benefits. Legacy applications continue to run on the untrusted operating system, while...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Apr 2015

    Cloudlet Mesh for Securing Mobile Clouds from Intrusions and Network Attacks

    In this paper, the authors present a new cloudlet mesh architecture for security enforcement to establish trusted mobile cloud computing. The cloudlet mesh is Wi-Fi or mobile-connected to the Internet. This security framework establishes a cyber-trust shield to fight against intrusions to distance clouds, prevent spam/virus/worm attacks on mobile cloud...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Feb 2015

    RF-Powered Cognitive Radio Networks: Technical Challenges and Limitations

    The increasing demand for spectral and energy efficient communication networks has spurred a great interest in Energy Harvesting (EH) Cognitive Radio Networks (CRNs). Such a revolutionary technology represents a paradigm shift in the development of wireless networks, as it can simultaneously enable the efficient use of the available spectrum and...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Feb 2015

    Database-Assisted Spectrum Access in Dynamic Networks: A Distributed Learning Solution

    In this paper, the authors investigate the problem of database assisted spectrum access in dynamic TV white spectrum networks, in which the active user set is varying. Since there is no central controller and information exchange, it encounters dynamic and incomplete information constraints. To solve this challenge, they formulate a...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Feb 2015

    Optimal Adaptive Random Multiaccess in Energy Harvesting Wireless Sensor Networks

    Wireless sensors can integrate rechargeable batteries and Energy-Harvesting (EH) devices to enable long-term, autonomous operation, thus requiring intelligent energy management to limit the adverse impact of energy outages. This paper considers a network of EH wireless sensors, which report packets with a random utility value to a Fusion Center (FC)...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Feb 2015

    Sequential Channel State Tracking & SpatioTemporal Channel Prediction in Mobile Wireless Sensor Networks

    In this paper, the authors propose a nonlinear filtering framework for approaching the problems of channel state tracking and spatiotemporal channel gain prediction in mobile wireless sensor networks, in a Bayesian setting. They assume that the wireless channel constitutes an observable (by the sensors/network nodes), spatiotemporal, conditionally Gaussian stochastic process,...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jan 2015

    Intercept Behavior Analysis of Industrial Wireless Sensor Networks in the Presence of Eavesdropping Attack

    In this paper, the authors study the intercept behavior of an industrial Wireless Sensor Network (WSN) consisting of a sink node and multiple sensors in the presence of an eavesdropping attacker, where the sensors transmit their sensed information to the sink node through wireless links. Due to the broadcast nature...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jan 2015

    Tier-Aware Resource Allocation in OFDMA Macrocell-Small Cell Networks

    The authors present a joint sub-channel and power allocation framework for downlink transmission in an Orthogonal Frequency-Division Multiple Access (OFDMA)-based cellular network composed of a macrocell overlaid by small cells. In this framework, the Resource Allocation (RA) problems for both the macrocell and small cells are formulated as optimization problems....

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jan 2015

    Spatial Spectrum and Energy Efficiency of Random Cellular Networks

    It is a great challenge to evaluate the network performance of cellular mobile communication systems. In this paper, the authors propose new spatial spectrum and energy efficiency models for Poisson-Voronoi Tessellation (PVT) random cellular networks. To evaluate the user access the network, a Markov chain based wireless channel access model...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jan 2015

    Using Social Sensors for Influence Propagation in Networks with Positive and Negative Relationships

    Online social communities often exhibit complex relationship structures, ranging from close friends to political rivals. As a result, persons are influenced by their friends and foes differently. Future network applications can benefit from integrating these structural differences in propagation schemes through socially aware sensors. In this paper, the authors introduce...

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  • White Papers // Jan 2015

    Application-Bypass Reduction for Large-Scale Clusters

    Process skew is an important factor in the performance of parallel applications, especially in large-scale clusters. Reduction is a common collective operation which, by its nature, introduces implicit synchronization between the processes involved in the communication and is therefore highly susceptible to performance degradation due to process skew. A collective...

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  • White Papers // Jan 2015

    On the Nanoscale Electromechanical Wireless Communication in the VHF Band

    Electromagnetic communication at the nanoscale has, to date, been studied in either the Very High Frequency (VHF) (30 - 300MHz) or in the TeraHertz band (0.1 - 10THz). This paper is on electromagnetic communication in the VHF band and determining the Bit Error Rate (BER) performance of nanoscale receivers utilizing...

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  • White Papers // Dec 2014

    Evaluation of Hybrid Memory Technologies Using SOT-MRAM for On-Chip Cache Hierarchy

    Magnetic Random Access Memory (MRAM) is a very promising emerging memory technology because of its various advantages such as non-volatility, high density and scalability. In particular, Spin Orbit Torque (SOT) MRAM is gaining interest as it comes along with all the benefits of its predecessor Spin Transfer Torque (STT) MRAM,...

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  • White Papers // Dec 2014

    Medium Access Control Design for Full-Duplex Wireless Systems: Challenges and Approaches

    Recent advances in self-interference cancellation techniques enable in-band Full-Duplex (FD) transmission in which a wireless node can simultaneously transmit and receive in the same frequency band. However, to fully exploit the benefits of FD technology in a wireless network, in addition to the PHYsical (PHY) layer issues, Medium Access Control...

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  • White Papers // Dec 2014

    Lattice QCD with Domain Decomposition on Intel R Xeon Phi Co-Processors

    The gap between the cost of moving data and the cost of computing continues to grow, making it ever harder to design iterative solvers on extreme-scale architectures. This problem can be alleviated by alternative algorithms that reduce the amount of data movement. The authors investigate this in the context of...

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  • White Papers // Dec 2014

    Throughput of the Magnetic Induction Based Wireless Underground Sensor Networks: Key Optimization Techniques

    Wireless Underground Sensor Networks (WUSNs) present a variety of new research challenges. Recently, a Magneto-Inductive (MI) waveguide technique has been proposed to cope with the very harsh propagation conditions in WUSNs. This relay-based approach allows for an extension of the transmission range, which can be quite limited if relays are...

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  • White Papers // Nov 2014

    Relay-Selection Improves the Security-Reliability Trade-off in Cognitive Radio Systems

    In this paper, the authors consider a Cognitive Radio (CR) network consisting of a Secondary Transmitter (ST), a Secondary Destination (SD) and multiple Secondary Relays (SRs) in the presence of an eavesdropper, where the ST transmits to the SD with the assistance of SRs, while the eavesdropper attempts to intercept...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2014

    Efficient Shared-Memory Implementation of High-Performance Conjugate Gradient Benchmark and Its Application to Unstructured Matrices

    A new sparse High Performance Conjugate Gradient benchmark (HPCG) has been recently released to address challenges in the design of sparse linear solvers for the next generation extreme-scale computing systems. Key computation, data access, and communication pattern in HPCG represent building blocks commonly found in today's HPC applications. While it...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2014

    A Performance Model to Estimate Execution Time of Scientific Workflows on the Cloud

    Scientific workflows, which capture large computational problems, may be executed on large-scale distributed systems such as clouds. Determining the amount of resources to be provisioned for the execution of scientific workflows is a key component to achieve cost-efficient resource management and good performance. In this paper, a performance prediction model...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2014

    Coordinated Scheduling for the Downlink of Cloud Radio-Access Networks

    In this paper, the authors address the coordinated scheduling problem in cloud-enabled networks. Consider the downlink of a Cloud-Radio Access Network (C-RAN), where the cloud is only responsible for the scheduling policy and the synchronization of the transmit frames across the connected Base-Stations (BS). The transmitted frame of every BS...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2014

    Characterization of Coded Random Access with Compressive Sensing based Multi-User Detection

    The emergence of Machine-To-Machine (M2M) communication requires new Medium Access Control (MAC) schemes and PHYsical (PHY) layer concepts to support a massive number of access requests. The concept of coded random access, introduced recently, greatly outperforms other random access methods and is inherently capable to take advantage of the capture...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2014

    LEoNIDS: A Low-Latency and Energy-Efficient Network-Level Intrusion Detection System

    Over the past decade, design and implementation of low-power systems has received significant attention. While it started with data centers and battery-operated mobile devices, it has recently branched to core network devices such as routers. However, this emerging need for low-power system design has not been studied for security systems,...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2014

    Cloud Radio-Multistatic Radar: Joint Optimization of Code Vector and Backhaul Quantization

    A multi-static radar set-up is considered in which distributed receive antennas are connected to a Fusion Center (FC) via limited-capacity backhaul links. Similar to cloud radio access networks in communications, the receive antennas quantize the received baseband signal before transmitting it to the FC. The problem of maximizing the detection...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2014

    AirHopper: Bridging the Air-Gap between Isolated Networks and Mobile Phones using Radio Frequencies

    Information is the most critical asset of modern organizations, and accordingly coveted by adversaries. When highly sensitive data is involved, an organization may resort to air-gap isolation, in which there is no networking connection between the inner network and the external world. While infiltrating an air-gapped network has been proven...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2014

    Opportunistic Channel Access and RF Energy Harvesting in Cognitive Radio Networks

    Radio Frequency (RF) energy harvesting is a promising technique to sustain operations of wireless networks. In a cognitive radio network, a secondary user can be equipped with RF energy harvesting capability. In this paper, the authors consider such a network where the secondary user can perform channel access to transmit...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2014

    MIMO Wiretap Channels With Unknown and Varying Eavesdropper Channel States

    In this paper, a class of information theoretic secrecy problems is addressed where the eavesdropper channel state is completely unknown to the legitimate parties. In particular, a Gaussian MIMO wiretap channel is considered, where the eavesdropper channel state can vary from one channel use to the next, and the overall...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2014

    A Simple Distributed Power Control Algorithm for Cognitive Radio Networks

    In this paper, the authors study the power control problem for spectrum sharing based Cognitive Radio (CR) networks with multiple secondary Source-to-Destination (SD) pairs. A simple distributed algorithm is proposed for the Secondary Users (SUs) to iteratively adjust their transmit powers to improve the performance of the network. The proposed...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2014

    Efficient Embedded Microprocessor

    In this paper, the authors are trying to introduce an embedded microprocessor which is combination of embedded system and microprocessor. These embedded microprocessors are 8 bit devices programmed in assembly language. These processors are used as microcontrollers in devices such as automotive ignition control, digital radio tuning, printers, mobile phones,...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Oct 2014

    Resource Allocation Optimization for Delay-Sensitive Traffic in Fronthaul Constrained Cloud Radio Access Networks

    The Cloud Radio Access Network (C-RAN) provides high spectral and energy efficiency performances, low expenditures and intelligent centralized system structures to operators, which has attracted intense interests in both academia and industry. In this paper, a Hybrid Coordinated Multi-Point transmission (H-CoMP) scheme is designed for the downlink transmission in C-RANs,...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Oct 2014

    PARDICLE: Parallel Approximate Density-based Clustering

    DBSCAN is a widely used isodensity-based clustering algorithm for particle data well-known for its ability to isolate arbitrarily-shaped clusters and to filter noise data. The algorithm is super-linear (O(nlogn)) and computationally expensive for large datasets. Given the need for speed, the authors propose a fast heuristic algorithm for DBSCAN using...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Oct 2014

    Ergodic Capacity Analysis of Remote Radio Head Associations in Cloud Radio Access Networks

    Characterizing user to Remote Radio Head (RRH) association strategies in Cloud Radio Access Networks (C-RANs) is critical for performance optimization. In this letter, the single nearest and N - nearest RRH association strategies are presented and the corresponding impact on the ergodic capacity of CRANs is analyzed, where RRHs are...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Oct 2014

    Sparse Beamforming and User-Centric Clustering for Downlink Cloud Radio Access Network

    In this paper, the authors consider a downlink Cloud Radio Access Network (C-RAN) in which all the Base-Stations (BSs) are connected to a central computing cloud via digital backhaul links with finite capacities. Each user is associated with a user-centric cluster of BSs; the central processor shares the user's data...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Oct 2014

    Heterogeneous Cloud Radio Access Networks: A New Perspective for Enhancing Spectral and Energy Efficiencies

    To mitigate the severe inter-tier interference and enhance limited cooperative gains resulting from the constrained and non-ideal transmissions between adjacent base stations in Heterogeneous Networks (HetNets), Heterogeneous Cloud Radio Access Networks (H-CRANs) are proposed as cost-efficient potential solutions through incorporating the cloud computing into HetNets. In this paper, state-of-the-art research...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Oct 2014

    Cross-Layer Control for Worse Case Delay Guarantees in Heterogeneous Powered Wireless Sensor Network Via Lyapunov Optimization

    The delay guarantee is a challenge in Wireless Sensor Networks (WSNs), where energy constraints must be considered. The coexistence of renewable energy and electricity grid is expected as a promising energy supply manner for WSNs to remain function for a potentially infinite lifetime. In this paper, the authors address cross-layer...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Oct 2014

    Exploiting Mobility in Proportional Fair Cellular Scheduling: Measurements and Algorithms

    Proportional Fair (PF) scheduling algorithms are the de-facto standard in cellular networks. They exploit the users' channel state diversity (induced by fast-fading), and are optimal for stationary channel state distributions and an infinite time-horizon. However, mobile users experience a non-stationary channel, due to slow-fading (on the order of seconds), and...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Oct 2014

    A Practical, Secure, and Verifiable Cloud Computing for Mobile Systems

    Cloud computing systems, in which clients rent and share computing resources of third party platforms, have gained widespread use in recent years. Furthermore, cloud computing for mobile systems (i.e., systems in which the clients are mobile devices) have too been receiving considerable attention in technical literature. The authors propose a...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Oct 2014

    The Information Funnel: Exploiting Named Data for Information-Maximizing Data Collection

    In this paper, the authors describe the exploitation of hierarchical data names to achieve information-utility maximizing data collection in social sensing applications. They describe a novel transport abstraction, called the information funnel. It encapsulates a data collection protocol for social sensing that maximizes a measure of delivered information utility that...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Oct 2014

    A Composite Approach to Self-sustainable Transmissions: Rethinking OFDM

    In this paper, the authors propose two novel strategies to extend the battery life of an Orthogonal Frequency Division Multiplexing (OFDM) receiver, by exploiting the concept of Wireless Power Transfer (WPT). First a new receiver architecture is devised that does not discard the Cyclic Prefix (CP), but instead, exploits it...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Oct 2014

    Enhanced Secrecy in Stochastic Wireless Networks: Artificial Noise with Secrecy Protected Zone

    Recently, the use of artificial noise has attracted considerable attention in enhancing the physical-layer security of wireless systems. However, the interaction between artificially generated noise and the inherent network interference can significantly affect the level of secrecy. In this paper, the authors consider the additional secrecy enhancement with artificial noise...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2012

    LT Codes-Based Secure and Reliable Cloud Storage Service

    With the increasing adoption of cloud computing for data storage, assuring data service reliability, in terms of data correctness and availability, has been outstanding. While redundancy can be added into the data for reliability, the problem becomes challenging in the "Pay-as-you-use" cloud paradigm where the authors always want to efficiently...

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  • White Papers // Apr 2010

    Subspace-Based Blind Channel Estimation for MIMO-OFDM Systems With Reduced Time Averaging

    Among the various approaches recently proposed for blind estimation of wideband Multiple-Input - Multiple-Output (MIMO) wireless channels, subspace-based algorithms are particularly attractive due to their good performance and simple structure. These algorithms primarily exploit the orthogonality of the noise and signal subspaces of the correlation matrix of the received signals...

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  • White Papers // Apr 2010

    Dual Transform Domain Echo Canceller for Discrete Multitone Systems

    In communication systems where full-duplex transmission is required, digital echo cancellers are employed to cancel echo by means of adaptive filtering. In order to reduce the computational complexity of these cancellers, the structure of the Toeplitz matrix containing the transmitted signal is usually exploited to transform the time domain signals...

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  • White Papers // Apr 2010

    A Subspace Method for the Blind Identification of Multiple Time-Varying Fir Channels

    A new method is proposed for the blind subspace-based identification of the coefficients of Time-Varying (TV) Single-Input Multiple-Output (SIMO) FIR channels. The TV channel coefficients are represented via a finite basis expansion model, i.e. linear combination of known basis functions. In contrast to earlier related works, the basis functions need...

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  • White Papers // Nov 2009

    On Convergence Properties of Subspace Trackers Based on Orthogonal Iteration

    This paper studies convergence properties of subspace trackers using orthogonal iteration. In the context of blind estimation of a time-varying channel, orthogonal iteration and its variants have been widely considered for tracking the channel parameters by updating the eigen-decomposition of an exponentially weighted correlation matrix. While it is well known...

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  • White Papers // Nov 2009

    Bayesian Spectral Amplitude Estimation for Speech Enhancement With Correlated Spectral Components

    In Bayesian Short-Time Spectral Amplitude (STSA) estimation for single channel speech enhancement, the spectral components are traditionally assumed to be uncorrelated. However, this assumption is not exact since some correlation is present in practice. In this paper, the authors propose a STSA estimator with correlated frequency components. Since its closed-form...

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  • White Papers // Mar 2010

    Availability-Aware Provisioning Strategies for Differentiated Protection Services in Wavelength-Convertible WDM Mesh Networks

    In an optical WDM mesh network, different protection schemes (such as dedicated or shared protection) can be used to improve the service availability against network failures. However, in order to satisfy a connection's service-availability requirement in a cost-effective and resource-efficient manner, the people need a systematic mechanism to select a...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Oct 2009

    On the Level of Guaranteed Services for Signaling Control in Cellular Networks

    In this paper, the authors discuss their preliminary work on signaling overload control for cellular services which requires adaptability and scalability as well as guaranteed level of service. They propose a set of controls that can provide different grades of service to different service classes effectively. The controls are resource...

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  • White Papers // Oct 2011

    Performance Evaluation of Routing Protocols for Multimedia Transmission Over Mobile Ad Hoc Networks

    Mobile Ad hoc NETworks (MANETs) are becoming more essential to wireless communications due to growing popularity of mobile devices. The integration of mobile ad hoc devices inside vehicles has led to another type of networks, called Vehicular Ad hoc NETworks (VANETs) which are also becoming important. These networks require specialized...

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  • White Papers // Oct 2009

    A Geometrical Channel Model for MIMO Mobile-to-Mobile Fading Channels in Cooperative Networks

    This paper deals with the modeling and analysis of narrowband Multiple-Input Multiple-Output (MIMO) Mobile-To-Mobile (M2M) fading channels in relay-based cooperative networks. Non-Line-Of-Sight (NLOS) propagation conditions are assumed in the transmission links from the source mobile station to the destination mobile station via the mobile relay. A stochastic narrowband MIMO M2M...

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  • White Papers // Jun 2011

    Distributed Interference Cancellation for Cognitive Radios Using Periodic Signals of the Primary System

    This paper considers secondary usage of spectrum resources that are allocated to Frequency Division Duplexing (FDD)-based cellular systems. The authors propose an interference cancellation technique using the concept of distributed antenna array. They show that the interference from the primary cellular system can be cancelled at a secondary node equipped...

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  • White Papers // Feb 2011

    Probabilistic RFID Tag Detector Model

    The objective of this paper is to derive the channel transition probabilities for the reader-to-tag link in RFID, considering the peculiar receiver structure in a RFID tag. The model is a first necessary step to derive Maximum Likelihood receivers and also the Shannon capacity of the link. The standardization and...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jan 2010

    On Array-Processing Based Quasi-Orthogonal Space-Time Block-Coded OFDM Systems

    In this paper, the authors propose a Quasi-Orthogonal Space - Time Block Coding (QO-STBC) Orthogonal Frequency-Division Multiplex (OFDM) scheme for its application in frequency-selective channels. A novel decoding approach for QO-STBC OFDM is introduced, and it works based on an array-processing technique. The received QO-STBC OFDM symbol array is decomposed...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jun 2011

    Putting the Cart Before the Horse: Merging Traffic for Energy Conservation

    Reducing energy consumption in the Internet has become an increasingly important goal recently. Previous work on reducing energy consumption has primarily looked at either changing link rates or putting interfaces to sleep. Due to the unpredictable nature of traffic, the energy savings achieved have been modest, do not scale, and...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Dec 2011

    Asymptotically Optimal Resource Allocation in OFDM-Based Cognitive Networks With Multiple Relays

    In this paper, the problem of resources allocation in Decode-and-Forward (DF) relayed OFDM based cognitive system is considered. The dual decomposition technique is adopted to obtain an asymptotically optimal subcarrier pairing, relay selection, and power allocation. The resources are optimized under the individual power constraints in source and relays so...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Aug 2011

    On the Estimation of Randomly Sampled 2D Spatial Fields Under Bandwidth Constraints

    In this paper, the authors address the problem of the estimation of a spatial field defined over a two-dimensional space with wireless sensor networks. They assume that the field is (spatially) bandlimited and that it is sampled by a set of sensors which are randomly deployed in a given geographical...

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  • White Papers // Jul 2011

    FHT-Based Architectures for Multicarrier Modulation in Direct Detection and Coherent Optical Systems

    In this paper, flexible architectures based on the Fast Hartley Transform (FHT) for multicarrier modulation are presented. The analysis of performance using large size constellations shows that the proposed architectures furnish an alternative OFDM scheme for adaptive high-speed optical systems. Moreover, it is demonstrated that FHT modulation is suitable for...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Aug 2011

    Improved Decentralized Q-Learning Algorithm for Interference Reduction in LTE-Femtocells

    Femtocells are receiving considerable interest in mobile communications as a strategy to overcome the indoor coverage problems as well as to improve the efficiency of current macrocell systems. Nevertheless, the detrimental factor in such networks is co-channel interference between macrocells and femtocells, as well as among neighboring femtocells which can...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2011

    DTV Band Micropower RF Energy-Harvesting Circuit Architecture and Performance Analysis

    This paper has firstly, presented a rectenna circuit which has measured RF-to-DC conversion efficiency equal to 18.2% given -20 dBm, 550 MHz single tone excitation. The rectified voltage given a 550 MHz single tone excitation in the range -40 dBm to -15 dBm is between 0.9mV DC and 134mV DC,...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Aug 2011

    A Study of a Reflectarray Topology Based on Coupled Oscillator Arrays Using Substrate Integrated Waveguide Technology

    This paper presents the design of a reflectarray based on coupled oscillators, whose elements are active cavity-backed antenna oscillators. The cavity backed topology, implemented in Substrate Integrated Waveguide (SIW) technology, allows for a compact, single substrate implementation, and provides a means for the suppression of the undesired surface-wave modes and...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Apr 2011

    Large-SNR Outage Analysis for the DF Relay Channel With Randomized Space-Time Block Coding

    A simple half-duplex decode-and-forward relay channel is presented and analyzed. Relays access the common channel by means of a randomized linear-dispersion space-time block code which is flexible with respect to the number of relays and the coding rate. When the dimensions of the linear dispersion matrices grow large, but with...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2011

    Satellite Radiolocalization From GPS to GNS Sand Beyond: Novel Technologies and Applications for Civil Mass Market

    It is known that satellite radio-localization was born in the military environment and was originally conceived for defense purposes. Nevertheless, the commercial explosion (dated to 20 years ago) of global positioning system (GPS) in the civil market (automotive, tourism, etc.) significantly changed the original perspectives of this technology. Another big...

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  • White Papers // Oct 2011

    Frequency Domain Joint TOA and DOA Estimation in IR-UWB

    This paper addresses the problem of TOA and DOA estimation in IR-UWB systems. It considers a frequency domain approach for joint high resolution estimation of Time Of Arrival (TOA) and Direction Of Arrival (DOA). The proposed scheme performs timing acquisition following a two step approach: a first stage where coarse...

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  • White Papers // Dec 2011

    Saturation Throughput Performance Analysis of a Medium Transparent MAC Protocol for 60 GHz Radio-Over-Fiber Networks

    The authors describe an analytical model for calculating the saturation throughput performance of a medium transparent Medium Access Control (MAC) protocol in 60 GHz Radio-over-Fiber (RoF) networks. The proposed model incorporates effectively the medium transparent MAC mechanism, assuming a finite number of terminals and ideal channel conditions. It takes into...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Oct 2011

    Secure Resource Allocation and Scheduling for OFDMA Decode-and-Forward Relay Networks

    In this paper, the authors formulate an optimization problem for secure resource allocation and scheduling in Orthogonal Frequency Division Multiple Access (OFDMA) half-duplex Decode-and-Forward (DF) relay assisted networks. Their problem formulation takes into account artificial noise generation to combat a passive multiple antenna eavesdropper and the effects of imperfect Channel...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Dec 2011

    Optimal Power Allocation Algorithm for OFDM-Based Decode-and-Forward Dual-Hop Cognitive Systems

    Relayed transmission is a promising technique to increase coverage and achievable capacity of the communication systems. A cognitive OFDM-based Decode-and-Forward (DF) cooperative relay network is considered in this paper. The objective of the problem is to maximize the capacity of the Cognitive Radio (CR) system while guaranteeing that the interference...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Dec 2011

    Optimal Resource Allocation in Multi-Relay Cognitive Networks Using Dual Decomposition

    In this paper, an OFDM-based multi-relay cognitive radio network is considered where the relays use the decode-and-forward protocol to assist the source to relay transmission. The objective is to maximize the capacity of the CR network by optimizing the relay selection, subcarrier pairing and the power allocation. The optimization is...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Dec 2011

    Sparse Channel Estimation Based on Compressed Sensing for Ultra WideBand Systems

    Channel estimation for purposes of equalization is a long standing problem in signal processing. Wireless propagation is characterized by sparse channels, that is channels whose time domain impulse response consists of few dominant multipath fingers. This paper examines the use of Compressed Sensing (CS) in the estimation of highly sparse...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Aug 2011

    U-Band Micromachined Coaxial Filter

    This paper presents a micro-machined filter for millimeter-wave applications operating at U-band. The structure was designed using a rectangular coaxial line with the center conductor suspended in air. The rectangular coaxial cables have been optimized to provide a low attenuation constant. The design includes a Co-Planar Waveguide (CPW)-to-coaxial transition to...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Oct 2011

    Joint IP Networking and Radio Architecture for Vehicular Networks

    An attempt is made at jointly describing IP addressing/routing and radio architecture for vehicular networks. Since, this relates very different communications layers (PHY/MAC/Network), the effective results are only roughly identified; yet the traits of a common perspective do develop, thanks to identifying common aspects of the vehicular networks topologies. The...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Apr 2012

    Traffic Analysis Attacks and Countermeasures in Wireless Body Area Sensor Networks

    In this paper, the authors study the problem of traffic analysis attacks in wireless body area sensor networks. When these networks are used in health-care for remote patient monitoring, traffic analysis can reveal the type of medical sensors mounted on the patient, and this information may be used to infer...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2011

    Modeling In-Network Aggregation in VANETs

    The multitude of applications envisioned for Vehicular Ad-hoc NETworks (VANETs) requires efficient communication and dissemination mechanisms to prevent network congestion. In-network data aggregation promises to reduce bandwidth requirements and enable scalability in large vehicular networks. However, most existing aggregation schemes are tailored to specific applications and types of data. Proper...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jul 2010

    MCMAC: An Optimized Medium Access Control Protocol for Mobile Clusters in Wireless Sensor Networks

    Wireless Sensor Networks (WSNs) are developing into a promising solution for many applications, for example in healthcare. In many scenarios, there is some form of node mobility. The Medium Access Control (MAC) mechanisms should support the expected kind of mobility in the network. Mobility is particularly complicating for contention free...

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  • White Papers // Apr 2012

    Modeling of Wireless Sensor Nodes Powered by Tunable Energy Harvesters: HDL-Based Approach

    This paper presents a Hardware Description Language (HDL) approach to modeling a complete wireless sensor node system powered by a tunable vibration energy harvester including both energy generation and consumption. Tunable energy harvesters, which can adjust their own resonant frequency through mechanical or electrical methods to match the input frequency,...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Sep 2011

    Photovoltaic Sample-and-Hold Circuit Enabling MPPT Indoors for Low-Power Systems

    PhotoVoltaic (PV) energy harvesting is commonly used to power autonomous devices, and Maximum Power Point Tracking (MPPT) is often used to optimize its efficiency. This paper describes an ultra low-power MPPT circuit with a novel sample-and-hold and cold-start arrangement, enabling MPPT across the range of light intensities found indoors, which...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2011

    Dynamic Data Prioritization for Quality-of-Service Differentiation in Heterogeneous Wireless Sensor Networks

    In many applications of Wireless Sensor Networks (WSNs), heterogeneity is a common property in terms of different sensor types and different circumstances like node location, link quality, and local node density. In many applications, there are several different sensor types with entirely different Quality-of-Service (QoS) requirements. The requirements may also...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Sep 2011

    Localized Geographic Routing to a Mobile Sink With Guaranteed Delivery in Sensor Networks

    The authors propose a novel localized Integrated Location Service and Routing (ILSR) scheme, based on the geographic routing protocol GFG, for data communications from sensors to a mobile sink in wireless sensor networks. The objective is to enable each sensor to maintain a slow-varying routing next hop to the sink...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2011

    Dynamic Beacon Mobility Scheduling for Sensor Localization

    In mobile-beacon assisted sensor localization, beacon mobility scheduling aims to determine best beacon trajectory so that each sensor receives sufficient beacon signals and becomes localized with minimum delay. The authors propose a novel DeteRministic dynamic bEAcon Mobility Scheduling (DREAMS) algorithm, without requiring any prior knowledge of the sensory field. In...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jan 2012

    Leveraging Prediction to Improve the Coverage of Wireless Sensor Networks

    As sensors are energy constrained devices, one challenge in Wireless Sensor Networks (WSNs) is to guarantee coverage and meanwhile maximize network lifetime. In this paper, the authors leverage prediction to solve this challenging problem, by exploiting temporal-spatial correlations among sensory data. The basic idea lies in that a sensor node...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2011

    Smart Community: An Internet of Things Application

    The Internet of Things (IoT) is an emerging concept referring to networked everyday objects that interconnect to each other via wireless sensors attached to them. Smart homes are an appealing IoT practice. It pushes forward a future home environment where embedded sensors and actuators (e.g., in consumer electronic products and...

    Provided By Institute of Electrical & Electronic Engineers