Institute of Electrical & Electronic Engineers

Displaying 1-40 of 10539 results

  • 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 // Sep 2014

    The Mean Interference-to-Signal Ratio and its Key Role in Cellular and Amorphous Networks

    The authors introduce a simple yet powerful and versatile analytical framework to approximate the SIR distribution in the downlink of cellular systems. It is based on the mean interference to-signal ratio and yields the horizontal gap (SIR gain) between the SIR distribution in question and a reference SIR distribution. As...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Sep 2014

    Device-to-Device Communications Achieve Efficient Load Balancing in LTE-Advanced Networks

    In LTE-advanced networks, besides the overall coverage provided by traditional macrocells, various classes of low-power nodes (LPNs, like pico eNBs, femto eNBs, and relays) can be distributed throughout the macrocells as a more targeted underlay to further enhance the area spectral efficiency, alleviate traffic hot zones, and thus improve the...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Aug 2014

    A Cross-Layer Approach for Distributed Energy-Efficient Power Control in Interference Networks

    In contrast with existing works which rely on the same type of energy-efficiency measure to design distributed power control policies, the present work takes into account the presence of a finite packet buffer at the transmitter side and the impact of transport protocols. This approach is relevant when the transmitters...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Aug 2014

    Storage Capacity of Repairable Networks

    In this paper, the authors introduce a model of a distributed storage system that is locally recoverable from any single server failure. Unlike the usual local recovery model of codes for distributed storage, this model accounts for the fact that each server or storage node in a network is connectible...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Aug 2014

    Laplace Functional Ordering of Point Processes in Large-Scale Wireless Networks

    Stochastic orders on point processes are partial orders which capture notions like being larger or more variable. Laplace functional ordering of point processes is a useful stochastic order for comparing spatial deployments of wireless networks. It is shown that the ordering of point processes is preserved under independent operations such...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Aug 2014

    Partially-Distributed Resource Allocation in Small-Cell Networks

    Each new generation of wireless communication systems promises to support a larger number of mobile users with higher data rates, new applications and ever-more stringent Quality of Service (QoS) requirements. The authors propose a four-stage hierarchical resource allocation scheme for the downlink of a large-scale small-cell network in the context...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Aug 2014

    Tier Association Probability and Spectrum Partitioning for Maximum Rate Coverage in Multi-Tier Heterogeneous Networks

    For a wireless multi-tier heterogeneous network with orthogonal spectrum allocation across tiers, the authors optimize the association probability and the fraction of spectrum allocated to each tier so as to maximize rate coverage. In practice, the association probability can be controlled using a biased received signal power. The optimization problem...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jul 2014

    Channel Modeling for Metamaterial-Enhanced Underground Wireless Communications

    Wireless communication is the prerequisite for the highly desired in-situ and real-time monitoring capability in underground environments, including oil reservoirs, groundwater aquifers, and volcanos, among others. However, existing wireless communication techniques do not work in such environments due to the harsh transmission medium with very high material absorption and the...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jul 2014

    A Stochastic Geometry Analysis of Inter-cell Interference Coordination and Intra-cell Diversity

    Inter-Cell Interference Coordination (ICIC) and Intra-Cell Diversity (ICD) play important roles in improving cellular downlink coverage. Modeling cellular Base Stations (BSs) as a homogeneous Poisson Point Process (PPP), this paper provides explicit finite-integral expressions for the coverage probability with ICIC and ICD, taking into account the temporal/spectral correlation of the...

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  • White Papers // Jul 2014

    Fast Iterative Graph Computation: A Path Centric Approach

    Large scale graph processing represents an interesting systems challenge due to the lack of locality. This paper presents PathGraph, a system for improving iterative graph computation on graphs with billions of edges. The authors' system design has three unique features: first, they model a large graph using a collection of...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jul 2014

    Use of Network Latency Profiling and Redundancy for Cloud Server Selection

    As servers are placed in diverse locations in networked services today, it becomes vital to direct a client's request to the best server(s) to achieve both high performance and reliability. In this distributed setting, non-negligible latency and server availability become two major concerns, especially for highly-interactive applications. Profiling latencies and...

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  • White Papers // Jul 2014

    SCORPIO: A 36-Core Research Chip Demonstrating Snoopy Coherence on a Scalable Mesh NoC With In-Network Ordering

    In the many-core era, scalable coherence and on-chip interconnects are crucial for shared memory processors. While snoopy coherence is common in small multicore systems, directory-based coherence is the de facto choice for scalability to many cores, as snoopy relies on ordered interconnects which do not scale. However, directory-based coherence does...

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  • White Papers // Jun 2014

    Assessing the Performance-Energy Balance of Graphics Processors for Spectral Unmixing

    Remotely sensed hyperspectral imaging missions are often limited by onboard power restrictions while, simultaneously, require high computing power in order to address applications with relevant constraints in terms of processing times. In recent years, Graphics Processing Units (GPUs) have emerged as a commodity computing platform suitable to meet real-time processing...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jun 2014

    Interface Design for Synthesized Structural Hybrid Microarchitectural Simulators

    Computer designers rely upon near-cycle-accurate microarchitectural simulators to explore the design space of new systems. Hybrid simulators which offload simulation work onto FPGAs overcome the speed limitations of software-only simulators as systems become more complex, however, such simulators must be automatically synthesized or the time to design them becomes prohibitive....

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  • White Papers // Jun 2014

    Fine-grain Task Aggregation and Coordination on GPUs

    In General-Purpose Graphics Processing Unit (GPGPU) computing, data is processed by concurrent threads executing the same function. This model, dubbed Single-Instruction/Multiple-Thread (SIMT), requires programmers to coordinate the synchronous execution of similar operations across thousands of data elements. To alleviate this programmer burden, the researchers outlined the channel abstraction, which facilitates...

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  • White Papers // Jun 2014

    Variability of Multistage Synchronizers

    System-on-Chip (SoC) designs typically employ multiple clock domains to interface several externally clocked circuits operating at different frequencies, and to reduce power and area by breaking large clock trees into multiple small ones. The principal challenge of such Globally Asynchronous Locally Synchronous (GALS) architectures is the need to reliably communicate...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jun 2014

    A Novel Approach of Session Key Management Protocol with Time Varying Reliable Cluster Formation Using SPIKE Based on WSNs

    In this paper, the authors present implementation and evaluation of concept of Symmetric Parallel Immalleable Key Establishment (SPIKE) using NS2. It's a young session key distribution protocol for Wireless Sensor Networks (WSN). In this paper, each sensor node before being deployed they must be registered with a central Key Management...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2014

    ViPZonE: Hardware Power Variability-Aware Virtual Memory Management for Energy Savings

    Hardware variability is predicted to increase dramatically over the coming years as a consequence of continued technology scaling. In this paper, the authors apply the Underdesigned and Opportunistic computing (UnO) paradigm by exposing system-level power variability to software to improve energy efficiency. They present ViPZonE, a memory management solution in...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2014

    Multi-GPU Implementation of the Minimum Volume Simplex Analysis Algorithm for Hyperspectral Unmixing

    Spectral unmixing is an important task in remotely sensed hyperspectral data exploitation. The linear mixture model has been widely used to unmix hyperspectral images by identifying a set of pure spectral signatures, called end-members, and estimating their respective abundances in each pixel of the scene. Several algorithms have been proposed...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2014

    A Data Hiding Implementation in Encrypted Images for Secure Data Access

    Recently more and more attention is paid towards the data security as there is very big problem of data hacking in the industry. So, various techniques are made available for secure data access. One of the way is to transfer the data through the image, means the image is encrypted...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2014

    Resource Allocation in Wireless Networks with RF Energy Harvesting and Transfer

    Radio Frequency (RF) energy harvesting and transfer techniques have recently become alternative methods to power the next generation of wireless networks. As this emerging technology enables proactive replenishment of wireless devices, it is advantageous in supporting applications with Quality-of-Service (QoS) requirement. This paper focuses on the resource allocation issues in...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2014

    Jericho: Achieving Scalability Through Optimal Data Placement on Multicore Systems

    Achieving high I/O throughput on modern servers presents significant challenges. With increasing core counts, server memory architectures become less uniform, both in terms of latency as well as bandwidth. In particular, the bandwidth of the interconnect among NUMA nodes is limited compared to local memory bandwidth. Moreover, interconnect congestion and...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2014

    BTI-Gater: An Aging-Resilient Clock Gating Methodology

    Negative- and Positive-Bias Temperature Instability (N/PBTI) have become one of the most important reliability issues in modern semiconductor technology. N/PBTI-induced degradation depends heavily on workload, which causes imbalanced degradation and additional clock skew for clock distribution networks with clock gating features. In this paper, the authors first analyze the effects...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2014

    Performance Evaluation of Time and Frequency Domain Equalizers

    In this paper, the authors present performance evaluation of two implementations of an equalizer: a Time Domain Equalizer (TDE) based on the Least Mean Squares (LMS) algorithm and a Frequency Domain Equalizer (FDE) based on the Fast LMS algorithm. The comparison between the two algorithms is based on the computational...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2014

    Possibility of Different Threats to Cloud & Web Applications

    The area of cloud computing is now is at research edge. Day-by-day new services are launched to fulfill customer demands. Everyone wants paperless system and data availability at any time. But performance of web and cloud applications based on network stability. If network is not stable and secure then different...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2014

    Evolutionary Scheduling of Dynamic Multitasking Workloads for Big-data Analytics in Elastic Cloud

    Scheduling of dynamic and multitasking workloads for big-data analytics is a challenging issue, as it requires a significant amount of parameter sweeping and iterations. Therefore, real-time scheduling becomes essential to increase the throughput of many-task computing. The difficulty lies in obtaining a series of optimal yet responsive schedules. In dynamic...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2014

    Mobius: A High Performance Transactional SSD with Rich Primitives

    Providing transactional primitives of NAND flash based Solid State Disks (SSDs) have demonstrated a great potential for high performance transaction processing and relieving software complexity. Similar with software solutions like Write Ahead Logging (WAL) and shadow paging, transactional SSD has two parts of overhead which include: write overhead under normal...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2014

    MorphStore: A Local File System for Big Data with Utility-driven Replication and Load-adaptive Access Scheduling

    File system performance is critical for overall performance of Big Data workloads. Typically, big data file systems consist of dual layers; a local node-level file system and a global file system. This paper presents the design and implementation of MorphStore, a local file system design that significantly improves performance when...

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  • White Papers // May 2014

    Anode: Empirical Detection of Performance Problems in Storage Systems Using Time-Series Analysis of Periodic Measurements

    Performance problems are particularly hard to detect and diagnose in most computer systems, since there is no clear failure apart from the system being slow. In this paper, the authors present an empirical, data-driven methodology for detecting performance problems in data storage systems, and aiding in quick diagnosis once a...

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  • White Papers // May 2014

    Improving Physical-Layer Security in Wireless Communications Using Diversity Techniques

    Due to the broadcast nature of radio propagation, the wireless transmission can be readily overheard by unauthorized users for interception purposes and is thus highly vulnerable to eavesdropping attacks. To this end, physical-layer security is emerging as a promising paradigm to protect the wireless communications against eavesdropping attacks by exploiting...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2014

    DedupT: Deduplication for Tape Systems

    Deduplication is a commonly-used technique on disk-based storage pools. However, deduplication has not been used for tape-based pools: tape characteristics, such as high mount and seek times combined with data fragmentation resulting from deduplication create a toxic combination that leads to unacceptably high retrieval times. This paper proposes DedupT, a...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2014

    Client-Aware Cloud Storage

    Cloud storage is receiving high interest in both academia and industry. As a new storage model, it provides many attractive features, such as high availability, resilience, and cost efficiency. Yet, cloud storage also brings many new challenges. In particular, it widens the already-significant semantic gap between applications, which generate data,...

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  • White Papers // May 2014

    Exploiting Parallelism in I/O Scheduling for Access Conflict Minimization in Flash-based Solid State Drives

    Solid State Drives (SSDs) have been widely deployed in personal computers, data centers, and cloud storages. In order to improve performance, SSDs are usually constructed with a number of channels with each channel connecting to a number of NAND flash chips. Despite the rich parallelism offered by multiple channels and...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2014

    Analytical Modeling of Garbage Collection Algorithms in Hotness-Aware Flash-Based Solid State Drives

    Garbage collection plays a central role of flash-based solid state drive performance, in particular, its endurance. Analytical modeling is an indispensable instrument for design improvement as it demonstrates the relationship between SSD endurance, manifested as write amplification, and the algorithmic design variables, as well as workload characteristics. In this paper,...

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  • White Papers // May 2014

    HiSMRfs: a High Performance File System for Shingled Storage Array

    HiSMRfs, a file system with standard POSIX interface suitable for Shingled Magnetic Recording (SMR) drives, has been designed and developed. HiSMRfs can manage raw SMR drives and support random writes without remapping layer implemented inside SMR drives. To achieve high performance, HiSMRfs separates data and metadata storage, and manages them...

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  • White Papers // May 2014

    A Protected Block Device for Persistent Memory

    Persistent Memory (PM) technologies, such as Phase Change Memory (PCM), STT-RAM, and memristors, are receiving increasingly high interest in academia and industry. PM provides many attractive features, such as DRAM-like speed and storage like persistence. Yet, because it draws a blurry line between memory and storage, neither a memory- or...

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  • White Papers // May 2014

    SSD-Optimized Workload Placement with Adaptive Learning and Classification in HPC Environments

    In recent years, Non-Volatile Memory (NVM) devices such as SSD drives have emerged as a viable storage solution due to their increasing capacity and decreasing cost. Due to the unique capability and capacity requirements in large scale HPC (High Performance Computing) storage environment, a hybrid configuration (SSD and HDD) may...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2014

    Automatic Generation of Behavioral Hard Disk Drive Access Time Models

    Predicting access times is a crucial part of predicting Hard Disk Drive (HDD) performance. Existing approaches use white-box modeling and require intimate knowledge of the internal layout of the drive, which can take months to extract. Automatically learning this behavior is a much more desirable approach, requiring less expert knowledge,...

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  • White Papers // Mar 2012

    Gaussian Multiple Description Coding with Low-Density Generator Matrix Codes

    Multiple description coding is a classic problem in network information theory. El Gamal and Cover established a general inner bound of the 2-description rate region, commonly referred to as the EGC region. Ozarow proved that the EGC region is tight in the quadratic Gaussian case. In fact, it has been...

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  • White Papers // Mar 2011

    On the Role of the Refinement Layer in Multiple Description Coding and Scalable Coding

    The authors clarify the relationship among several existing achievable multiple description rate-distortion regions by investigating the role of refinement layer in multiple description coding. Specifically, they show that the refinement layer in the El Gamal-Cover (EGC) scheme and the Venkataramani-Kramer-Goyal (VKG) scheme can be removed; as a consequence, the EGC...

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  • White Papers // Nov 2010

    Robust Multiresolution Coding

    In multiresolution coding a source sequence is encoded into a base layer and a refinement layer. The refinement layer, constructed using a conditional codebook, is in general not decodable without the correct reception of the base layer. By relating multiresolution coding with multiple description coding, the authors show that it...

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  • White Papers // Oct 2010

    New Coding Schemes for the Symmetric K-Description Problem

    The authors propose novel coding schemes for the k-description problem with symmetric rates and symmetric distortion constraints. There are two main new ingredients in these schemes: the first one is akin to the method seen in the well-known butterfly network of network coding literature, and systematic erasure channel codes are...

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  • White Papers // Aug 2010

    Tighter Bounds on the Capacity of Finite-State Channels Via Markov Set-Chains

    The capacity analysis of this channel model has received considerable attention due to its theoretical significance and practical implications. The theory of Markov set-chains is applied to derive upper and lower bounds on the capacity of finite-state channels that are tighter than the classic bounds by Gallager. The new bounds...

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  • White Papers // Jun 2010

    Achieving the Rate-Distortion Bound with Low-Density Generator Matrix Codes

    Achieving the rate-distortion bound of discrete memoryless sources has been one of the grand challenges in information theory. Though Shannon has shown that the bound can be achieved asymptotically by using random block codes, the exponential encoding complexity makes such codes impractical. It is shown that binary low-density generator matrix...

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  • White Papers // Mar 2012

    Nearest Neighbor Decoding in MIMO Block-Fading Channels with Imperfect CSIR

    This paper studies communication outages in Multiple-Input Multiple-Output (MIMO) block-fading channels with imperfect Channel State Information at the Receiver (CSIR). Using mismatched decoding error exponents, the authors prove the achievability of the generalized outage probability, the probability that the Generalized Mutual Information (GMI) is less than the data rate, and...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Nov 2009

    SINR Balancing Technique for Downlink Beamforming in Cognitive Radio Networks

    The authors propose a novel Signal to Interference and Noise (SINR) balancing technique for a downlink Cognitive Radio Network (CRN) wherein multiple cognitive users (also referred to as Secondary Users (SUs)) coexist and share the licensed spectrum with the Primary Users (PUs) using the underlay approach. The proposed beamforming technique...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Aug 2009

    Statistical Eigenmode Transmission Over Jointly Correlated MIMO Channels

    The authors investigate Multiple-Input Multiple-Output (MIMO) eigen-mode transmission using statistical channel state information at the transmitter. They consider a general jointly correlated MIMO channel model, which does not require separable spatial correlations at the transmitter and receiver. For this model, they first derive a closed-form tight upper bound for the...

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  • White Papers // May 2009

    Transmit Antenna Selection Based Strategies in MISO Communication Systems with Low-Rate Channel State Feedback

    The performance of multiple-antenna communication systems is known to critically depend on the amount of Channel State Information (CSI) available at the transmitter. In the low-rate CSI feedback case, an important problem is what kind of information should be submitted to the transmitter in each feedback cycle and what is...

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  • White Papers // Mar 2013

    Cooperative Robotic Structure Mapping Using Wireless Measurements - A Comparison of Random and Coordinated Sampling Patterns

    In this paper, the authors consider a mobile robotic network that is tasked with building a map of the objects/obstacles in an environment. They are interested in the see-through mapping of the obstacles, i.e., a mapping approach that can build the spatial variations of the occluded structures. They consider two...

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  • White Papers // Feb 2013

    The Diversity Potential of Relay Selection With Practical Channel Estimation

    Wireless relaying technology has been recently proposed as a method that promises significant performance improvement in wireless communications without any power increase. Among the most common relaying techniques is so-called relay selection which has been extensively analyzed in the literature and is conceptually related to antenna selection in multi-antenna schemes....

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  • White Papers // Apr 2013

    Error Control for Local Broadcasting in Heterogeneous Wireless Ad Hoc Networks

    Local (single-hop) broadcasting is widely employed in distributed protocols (e.g., neighbor discovery, local information exchange in distributed network optimization and gossip-based algorithms) in wireless ad hoc networks. The performance of local broadcasting is characterized by the mean number of neighbors and the probability distribution of the number of neighbors of...

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  • White Papers // May 2013

    On the Capacity Bounds for Poisson Interference Channels

    The Poisson interference channel, which models optical communication systems with multiple transceivers, is investigated. Conditions for the strong interference regime are characterized and the corresponding capacity region is derived, which is the same as that of the compound Poisson multiple access channel with each receiver decoding both messages. For the...

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  • White Papers // Dec 2012

    Transceiver Design for Distributed STBC Based AF Cooperative Networks in the Presence of Timing and Frequency Offsets

    In multi-relay cooperative systems, the signal at the destination is affected by impairments such as multiple channel gains, Multiple Timing Offsets (MTOs), and Multiple Carrier Frequency Offsets (MCFOs). In this paper, the authors account for all these impairments and propose a new transceiver structure at the relays and a novel...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2013

    Optimal Training Sequences for Joint Timing Synchronization and Channel Estimation in Distributed Communication Networks

    For distributed multi-user and multi-relay cooperative networks, the received signal may be affected by Multiple Timing Offsets (MTOs) and multiple channels that need to be jointly estimated for successful decoding at the receiver. This paper addresses the design of optimal training sequences for efficient estimation of MTOs and multiple channel...

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  • White Papers // Jan 2013

    Phase Noise in MIMO Systems: Bayesian Cramer-Rao Bounds and Soft-Input Estimation

    This paper addresses the problem of estimating time varying phase noise caused by imperfect oscillators in Multi-Input Multi-Output (MIMO) systems. The estimation problem is parameterized in detail and based on an equivalent signal model its dimensionality is reduced to minimize the overhead associated with phase noise estimation. New exact and...

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  • White Papers // Sep 2012

    Joint Estimation of Channel and Oscillator Phase Noise in MIMO Systems

    Oscillator phase noise limits the performance of high speed communication systems since it results in time varying channels and rotation of the signal constellation from symbol to symbol. In this paper, joint estimation of channel gains and Wiener phase noise in Multi-Input Multi-Output (MIMO) systems is analyzed. The signal model...

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  • White Papers // Feb 2009

    Wiener Filter Design in Power-Quality Improvement

    This paper designs a Finite Impulse Response (FIR) filter using the Wiener-Hopff Equation, to mitigate Power-Auality (PQ) disturbances caused by harmonics and flickers. The filter design is based on retrieving the fundamental component and suppressing all other disturbances, or alternatively the filter is designed based on extracting the disturbances first...

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  • White Papers // Feb 2009

    Channel Equalizer Design Based on Wiener Filter and Least Mean Square Algorithms

    This paper investigates the Wiener and Least Mean Square (LMS) algorithms in the design of traversal tap delay line filters for the purpose of compensating the effect of the communication channel. The designed equalizers remove the distortion caused by the channel from the transmitted signal without requiring any specific model...

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  • White Papers // May 2012

    Decentralized Bargain: A Two-Tier Market for Efficient and Flexible Dynamic Spectrum Access

    Market mechanisms have been exploited as important means for spectrum acquisition and access in cognitive radio networks. In this paper, the authors propose a two-tier market for decentralized dynamic spectrum access. In the proposed Tier- 1 market, spectrum is traded from a Primary User (PU) to Secondary Users (SUs) in...

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  • White Papers // Feb 2013

    FASA: Accelerated S-ALOHA Using Access History for Event-Driven M2M Communications

    Supporting massive device transmission is challenging in Machine-To-Machine (M2M) communications. Particularly, in event-driven M2M communications, a large number of devices become activated within a short period of time, which in turn causes high radio congestions and severe access delay. To address this issue, the authors propose a Fast Adaptive S-ALOHA...

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  • White Papers // Apr 2012

    Opportunistic Spectrum Access in Multiple-Primary-User Environments Under the Packet Collision Constraint

    Cognitive Radio (CR) technology has great potential to alleviate spectrum scarcity in wireless communications. It allows Secondary Users (SUs) to opportunistically access spectrum licensed by Primary Users (PUs) while protecting PU activity. The protection of the PUs is central to the adoption of this technology since no PU would accommodate...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Aug 2012

    Efficient and Fair Bandwidth Allocation in Multichannel Cognitive Radio Networks

    Cognitive Radio (CR) improves spectrum efficiency by allowing Secondary Users (SUs) to dynamically exploit the idle spectrum owned by Primary Users (PUs). This paper studies optimal bandwidth allocation of SUs for throughput efficiency. Consider the following tradeoff: an SU increases its instantaneous throughput by accessing more spectrum, but channel access/switching...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // May 2012

    Geographic Trough Filling for Internet Datacenters

    To reduce datacenter energy consumption and cost, current practice has considered demand-proportional resource provisioning schemes, where servers are turned on/off according to the load of requests. Most existing work considers instantaneous (Internet) requests only, which are explicitly or implicitly assumed to be delay-sensitive. On the other hand, in datacenters, there...

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  • White Papers // Jan 2013

    Interference-Aware Relay Selection Scheme for Two-Hop Relay Networks with Multiple Source-Destination Pairs

    An interference-aware relay selection scheme is proposed for two-hop relay networks with multiple Source-Destination (S-D) pairs, each of which is assisted by a relay selected from the candidates. The authors address the interference from relays to their non-intended destinations, and the interference level at any destination is jointly affected by...

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  • White Papers // Nov 2012

    Cooperative Learning and Coordination for Cognitive Radio Networks

    The raison detre for cognitive radio is that the radio spectrum is a scarce resource. Cognitive radio stretches this resource by enabling secondary users to operate in portions of the spectrum that are reserved for primary users but not currently used by the primary users. As it is whenever users...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jan 2013

    Secondary User Access in LTE Architecture Based on a Base-Station-Centric Framework with Dynamic Pricing

    Dynamic Spectrum Access (DSA) techniques based on the exclusive-use model provide a huge opportunity for Wireless Service Providers (WSPs) to improve the spectrum utilization in their licensed bands and generate additional profits by allowing temporary wireless access to unsubscribed Secondary Users (SUs). This paper presents a techno-economic analysis for regulated...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Mar 2013

    Analysis of the Generalized DF-CF for Gaussian Relay Channels: Decode or Compress?

    The authors consider a three-node quasi-static communication system with a full-duplex relay. The goal is to determine the relaying mode that enables rate-efficient communication under given channel conditions. To achieve this goal, they consider a generalized scheme that subsumes the Decode-and-Forward (DF) and Compress-and-Forward (CF) schemes as special cases. The...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Apr 2012

    Superanalysis of Optimum Combining with Application to Femtocell Networks

    A femtocell technology - towards the deployment of small-cell networks - is a key enabler for improving indoor coverage and throughput per network area at a low cost in future wireless networks. However, these small-cell networking inevitably increases cochannel interference due to aggressive (even uncontrolled) reuse of spectral resources. One...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Apr 2012

    Autonomous Component Carrier Selection for 4G Femtocells - A Fresh Look at an Old Problem

    This paper addresses the interference management problem in the context of LTE-Advanced femtocells. Due to the expected large number of user-deployed cells, centralized network planning becomes increasingly less viable. Consequently, the authors consider an architecture of autonomous decision makers. Their main contribution in this paper, denominated Generalized Autonomous Component Carrier...

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  • White Papers // Apr 2012

    The Economic Effects of Sharing Femtocells

    Femtocells are a promising technology for handling exponentially increasing wireless data traffic. Although extensive attention has been paid to resource control mechanisms, for example, power control and load balancing in femtocell networks, their success largely depends on whether operators and users accept this technology or not. In this paper, the...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Apr 2012

    On Medium Grain Scalable Video Streaming Over Femtocell Cognitive Radio Networks

    Femtocells are shown highly effective on improving network coverage and capacity by bringing base stations closer to mobile users. In this paper, the authors investigate the problem of streaming scalable videos in femtocell Cognitive Radio (CR) networks. This is a challenging problem due to the stringent QoS requirements of real-time...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jun 2012

    Requirements, Challenges and Analysis of Alternatives for Wireless Datalinks for Unmanned Aircraft Systems

    Two key challenges in the design of datalinks for Unmanned Aircraft (UAS) Systems compared to other wireless links are the long range of distances and speeds that need to be covered. The 960 - 1164 MHz part of the IEEE L band has been identified as a candidate spectrum for...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jun 2012

    Cooperative Unmanned Autonomous Vehicle Control for Spatially Secure Group Communications

    Beyond the individual independent Unmanned Autonomous Vehicle (UAV), cooperative control of multiple UAVs has started to receive significant attention from industry, academia and the military. For the sake of UAV cooperation, proper wireless communication is imperative, but incurs several problems. Among them, Spatially Secure Group Communication (SSGC), which must maximize...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jun 2012

    Bridging Cooperative Sensing and Route Planning of Autonomous Vehicles

    Autonomous Vehicles (AV) are used to solve the problem of data gathering in large scale sensor deployments with disconnected clusters of sensors networks. The authors' take is that an efficient strategy for data collection with AVs should leverage cooperation amongst sensors in communication range of each other forming a sensor...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jun 2012

    Optimization of UAV Heading for the Ground-to-Air Uplink

    The authors consider a collection of single-antenna ground nodes communicating with a multi-antenna Unmanned Aerial Vehicle (UAV) over a multiple-access ground-to-air communications link. The UAV uses beamforming to mitigate inter-user interference and achieve Spatial Division Multiple Access (SDMA). First, they consider a simple scenario with two static ground nodes and...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jun 2012

    Role-Based Connectivity Management with Realistic Air-to-Ground Channels for Cooperative UAVs

    Ad-hoc aerial sensor networks leveraging MUAVs (Micro Unmanned Aerial Vehicles) are ideally suited to cost-efficiently explore unknown or hostile environments for example in case of incidents producing harmful gases or radiation. In this paper, the authors present results on the investigations of communication-aware steering algorithms for cooperative MUAV swarms. The...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jul 2012

    Resilient Networked Control of Distributed Energy Resources

    This paper considers networked systems and develops distributed algorithm that is resilient against potential packet drops in the communication links between system components. The authors apply this algorithm to the problem of coordinating Distributed Energy Resources (DERs) for the provision of ancillary services in electrical networks, e.g., reactive power support...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jul 2012

    Multicast Routing for Decentralized Control of Cyber Physical Systems with an Application in Smart Grid

    In cyber physical systems, communication is needed for conveying sensor observations to controllers; thus, the design of the communication sub-system is of key importance for the stabilization of system dynamics. In this paper, multicast routing is studied for networking of decentralized sensors and controllers. The challenges of uncertain destinations and...

    Provided By Institute of Electrical & Electronic Engineers