Institute of Electrical & Electronic Engineers

Displaying 1-40 of 10569 results

  • 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

    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 // 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

    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...

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  • 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...

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  • 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

    Energy Efficient Resource Allocation and User Scheduling for Collaborative Mobile Clouds with Hybrid Receivers

    In this paper, the authors study the resource allocation and user scheduling algorithm for minimizing the energy cost of data transmission in the context of OFDMA Collaborative Mobile Cloud (CMC) with Simultaneous Wireless Information and Power Transfer (SWIPT) receivers. The CMC, which consists of several collaborating MTs offers one potential...

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  • 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...

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  • 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...

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  • 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...

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  • 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...

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  • White Papers // Sep 2014

    Backhaul-Constrained Small Cell Networks: Refunding and QoS Provisioning

    Small cell Access Points (SAPs) can offload macrocell traffic, improve indoor coverage and cell-edge user performance, and boost network capacity. In this paper, the authors investigate the problem faced by the Mobile Network Operator (MNO) on how to properly incentivize the existing private SAPs to serve extra roaming macrocell users....

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  • 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...

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  • 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...

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  • 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...

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  • 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...

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  • 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...

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  • White Papers // Aug 2014

    Optimal Subsidies for Shared Small Cell Networks -A Social Network Perspective

    In this paper, the authors study the optimal differentiated subsidies from a Mobile Network Operator (MNO) to form a shared small cell network using social network information. It is a win-win strategy for the MNO to offload data and for Small cell Users (SUs) to receive enhanced QoS. They formulate...

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  • White Papers // Aug 2014

    Teranets: Ultra-Broadband Communication Networks in the Terahertz Band

    Terahertz band communication is envisioned as a key technology to satisfy the data rate requirements of future wireless communication networks, and enable new applications both in classical networking domains as well as in novel nanoscale communication paradigms. Major recent advancements in THz band technologies are helping to finally close the...

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  • White Papers // Jul 2014

    An Alternating Direction Method Approach to Cloud Traffic Management

    In this paper, the authors introduce a unified framework for studying various cloud traffic management problems, ranging from geographical load balancing to backbone traffic engineering. They first abstract these real-world problems as a multi-facility resource allocation problem, and then develop two distributed optimization algorithms by exploiting the special structure of...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jul 2014

    Energy and Spectrum-Aware MAC Protocol for Perpetual Wireless Nanosensor Networks in the Terahertz Band

    Wireless NanoSensor Networks (WNSNs), i.e., networks of nanoscale devices with unprecedented sensing capabilities, are the enabling technology of long-awaited applications such as advanced health monitoring systems or surveillance networks for chemical and biological attack prevention. The peculiarities of the Terahertz band, which is the envisioned frequency band for communication among...

    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 // Jul 2014

    Cooperation and Storage Tradeoffs in Power Grids with Renewable Energy Resources

    One of the most important challenges in smart grid systems is the integration of renewable energy resources into its design. In this paper, two different techniques to mitigate the time varying and intermittent nature of renewable energy generation are considered. The first one is the use of storage, which smoothes...

    Provided By Institute of Electrical & Electronic Engineers

  • White Papers // Jul 2014

    Electric Vehicle Charging in Smart Grid: Optimality and Valley-Filling Algorithms

    Electric Vehicles (EVs) offer an attractive long-term solution to reduce the dependence on fossil fuel and greenhouse gas emission. At the same time, charging a large fleet of EVs distributed across the residential area poses a challenge for the distribution network. In this paper, the authors formulate this problem by...

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  • White Papers // Jul 2014

    End-to-End Propagation Noise and Memory Analysis for Molecular Communication over Microfluidic Channels

    Molecular Communication (MC) between a transmitter and a receiver placed in the chambers attached to a microfluidic channel is investigated. A linear end-to-end channel model is developed capturing the effects of the diffusion and the junction transition at the chambers, as well as the microfluidic channel shapes and the fluid...

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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...

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  • 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

    A Roadmap for Traffic Engineering in SDN-OpenFlow Networks

    Software Defined Networking (SDN) is an emerging networking paradigm that separates the network control plane from the data forwarding plane with the promise to dramatically improve network resource utilization, simplify network management, reduce operating cost, and promote innovation and evolution. Although traffic engineering techniques have been widely exploited in the...

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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

    On the Throughput of Wireless Underground Sensor Networks using Magneto-Inductive Waveguides

    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 approach allows for an extension of the transmission range, which can be quite limited if relays are...

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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...

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  • 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...

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  • White Papers // Jun 2014

    A Statistical-Physical Model of Interference in Diffusion-Based Molecular Nanonetworks

    Molecular nanonetworks stand at the intersection of nanotechnology, biotechnology, and network engineering. The research on molecular nanonetworks proposes the interconnection of nanomachines through molecule exchange. Amongst different solutions for the transport of molecules between nanomachines, the most general is based on free diffusion. This paper is to provide a statistical...

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  • 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...

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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...

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  • 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...

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  • 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...

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  • 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...

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  • 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...

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  • 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...

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  • 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...

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  • 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