Institute of Electrical and Electronics Engineers

Displaying 321-360 of 8564 results

  • White Papers // Apr 2012

    E2SIW: An Energy Efficient Scheme Immune to Wormhole Attacks in Wireless Ad Hoc Networks

    Wormhole attacks are considered as a severe security threat in multi-hop wireless ad hoc networks. In this paper, the authors propose an Energy-Efficient Scheme Immune to Wormhole attacks (their so-called E2SIW). This protocol uses the location information of nodes to detect the presence of a wormhole, and in case a...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    The Dynamic Granularity Memory System

    Chip multiprocessors enable continued performance scaling with increasingly many cores per chip. As the throughput of computation outpaces available memory bandwidth, however, the system bottleneck will shift to main memory. The authors present a memory system, the Dynamic Granularity Memory System (DGMS), which avoids unnecessary data transfers, saves power, and...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    Lane Decoupling for Improving the Timing-Error Resiliency of Wide-SIMD Architectures

    A significant portion of the energy dissipated in modern integrated circuits is consumed by the overhead associated with timing guard-bands that ensure reliable execution. Timing speculation, where the pipeline operates at an unsafe voltage with any rare errors detected and resolved by the architecture, has been demonstrated to significantly improve...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    The JavaSPI Framework for Security Protocol Implementation

    Security protocols are distributed algorithms that run over untrusted networks with the aim of achieving security goals, such as mutual authentication of two protocol parties. This paper presents JavaSPI, a \"Model-driven\" development framework that allows the user to reliably develop security protocol implementations in Java, starting from abstract models that...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    Analysis and Design of Tuned Turbo Codes

    Turbo codes and Multiple Parallel Concatenated Codes (MPCCs) perform very close to the Shannon limit with suboptimum iterative decoding, but the corresponding code ensembles are asymptotically bad in the sense that their minimum (Hamming) distance does not grow linearly with block length. It has been widely observed that there exists...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    FemtoCaching: Wireless Video Content Delivery Through Distributed Caching Helpers

    The authors propose and analyze a novel way for increasing the area spectral efficiency of video transmission in cellular communications systems. Small base stations called helpers with low-rate backhaul but high storage capacity cache popular video files. Mobile stations requesting video files receive them via short-range transmissions from helpers, if...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    Femtocaching and Device-to-Device Collaboration: A New Architecture for Wireless Video Distribution

    The authors present a new architecture to handle the ongoing explosive increase in the demand for video content in wireless networks. It is based on distributed caching of the content in femto-basestations with small or non-existing backhaul capacity but with considerable storage space, called helper nodes. They also consider using...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    Connectivity of Large Wireless Networks Under a Generic Connection Model

    Connectivity is one of the most fundamental properties of wireless multi-hop networks. A network is said to be connected if there is a path between any pair of nodes. Extensive research has been done on connectivity problems using the well-known random geometric graph and the unit disk connection model, which...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    Second-Order Resolvability, Intrinsic Randomness, and Fixed-Length Source Coding for Mixed Sources: Information Spectrum Approach

    The second-order achievable asymptotics in typical random number generation problems such as resolvability, intrinsic randomness, fixed-length source coding is considered. In these problems, several researchers have derived the first-order and the second-order achievability rates for general sources using the information spectrum methods. Although these formulas are general, their computation is...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    Signal Shaping and Modulation for Optical Wireless Communication

    In this paper, a signal shaping framework for Optical Wireless Communication (OWC) is proposed. The framework is tailored to the single-carrier pulse modulation techniques, such as multi-level Pulse Position Modulation (-PPM) and multi-level Pulse Amplitude Modulation (-PAM), and to multi-carrier transmission realized through multi-level Quadrature Amplitude Modulation (-QAM) with Orthogonal...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    Clipping Noise in OFDM-Based Optical Wireless Communication Systems

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

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    Improving Channel Estimation Accuracy in OFDM System Using MATLAB Simulation

    This paper is to improve channel estimation accuracy in OFDM system because channel state information is required for signal detection at receiver and its accuracy affects the overall performance of system and it is essential to improve the channel estimation for more reliable communications. OFDM system was chosen in this...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Training Symbol Design for Channel Estimation and IQ Imbalance Compensation in OFDM Systems

    In this paper, training symbol designs for estimation of frequency selective channels and compensation of In-phase (I) and Quadrature (Q) imbalances on OFDM transmitters and receivers are studied. The authors utilize Cross Entropy (CE) optimization techniques together with convex optimization to design training sequence that minimizes the channel estimate Mean...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Suboptimal Power Allocation for a Two-Path Successive Relay System with Full Interference Cancellation

    Although power allocation considerably affects the Symbol Error Rate (SER) performance of a Two-Path Successive Relay System (TPSRS), it is not yet studied in a Full Interference Cancellation (FIC) scenario. In this paper, the authors develop a suboptimal power allocation scheme for the TPSRS-FIC through minimizing an SER-based cost function....

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Utility-Based Dynamic Multi-Service Bandwidth Allocation in Heterogeneous Wireless Networks

    In this paper, the authors present a dynamic bandwidth allocation scheme for multiple services in heterogeneous networks. A utility function is introduced first, whose parameters are determined by the modified multi-state Analytic Hierarchy Process (AHP) which adapts to different load levels according to dynamic thresholds. Based on this, a bandwidth...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    A Physical-Layer Network Coding Scheme Based on Linear MIMO Detection

    A Physical-layer Network Coding (PNC) scheme based on MIMO linear detection is proposed in this paper for a two-way relay channel with a multi-antenna relay. The authors apply a real-valued linear combiner to the output symbols of the MIMO linear detector to obtain a superimposed constellation for which the labeling...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Performance Debugging in the Large Via Mining Millions of Stack Traces

    Given limited resource and time before software release, development-site testing and debugging become more and more insufficient to ensure satisfactory software performance. As a counterpart for debugging in the large pioneered by the Microsoft Windows Error Reporting (WER) system focusing on crashing/hanging bugs, performance debugging in the large has emerged...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Optimizing Channel Access for Event-Driven Wireless Sensor Networks: Analysis and Enhancements

    The authors study the problem of medium access control in domain of event-driven Wireless Sensor Networks (WSN). In this kind of WSN, sensor nodes send data to sink node only when an event occurs in the monitoring area. The nodes in this kind of WSN encounter correlated traffic as a...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Data Dissemination in Wireless Networks With Network Coding

    The authors investigate the use of network coding for information dissemination over a wireless network. Using network coding allows for a simple, distributed and robust algorithm where nodes do not need any information from their neighbors. In this paper, they analyze the time needed to diffuse information throughout a network...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Distributed Space Time Coding for Wireless Two-Way Relaying

    The authors consider the wireless two-way relay channel, in which two-way data transfer takes place between the end nodes with the help of a relay. For the Denoise-aNd-Forward (DNF) protocol, it was shown by Koike-Akino et. al. that adaptively changing the network coding map used at the relay greatly reduces...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Balancing the Trade-Offs Between Query Delay and Data Availability in MANETs

    In Mobile Ad hoc NETworks (MANETs), nodes move freely and link/node failures are common, which leads to frequent network partitions. When a network partition occurs, mobile nodes in one partition are not able to access data hosted by nodes in other partitions, and hence significantly degrade the performance of data...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Mitigating Routing Misbehavior in Disruption Tolerant Networks

    In Disruption Tolerant Networks (DTNs), selfish or malicious nodes may drop received packets. Such routing misbehavior reduces the packet delivery ratio and wastes system resources such as power and bandwidth. Although techniques have been proposed to mitigate routing misbehavior in mobile ad hoc networks, they cannot be directly applied to...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    On Optimal Link Activation With Interference Cancellation in Wireless Networking

    A fundamental aspect in performance engineering of wireless networks is optimizing the set of links that can be concurrently activated to meet given Signal-to-Interference-and-Noise Ratio (SINR) thresholds. The solution of this combinatorial problem is the key element in scheduling and cross-layer resource management. Previous works on link activation assume single-user...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    The Overall Balance Between Cooperation and Interference for a Class of Wireless Networks

    This paper investigates the benefits of cooperation in large wireless networks with multiple sources and relays, where the nodes form an homogeneous Poisson point process. The source nodes may dispose of their nearest neighbor from the set of inactive nodes as their relay. Although cooperation can potentially lead to significant...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    A Survey on Security for Mobile Devices

    Now-a-days, mobile devices are an important part of the authors' everyday lives since they enable the users to access a large variety of ubiquitous services. In recent years, the availability of these ubiquitous and mobile services has significantly increased due to the different form of connectivity provided by mobile devices,...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Reinforcement Learning Strategies for Self-Organized Coverage and Capacity Optimization

    Traditional manual procedures for coverage and capacity optimization are complex and time consuming due to the increasing complexity of cellular networks. This paper presents reinforcement learning strategies for self-organized coverage and capacity optimization through antenna downtilt adaptation. The authors analyze different learning strategies for a Fuzzy Q-Learning based solution in...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Topology Control in Multihop Wireless Networks With Multi-Beam Smart Antennas

    Smart (directional) antennas can be deployed in a wireless network to enhance the capacity of the network by forming one or multiple beams only towards intended receivers. In this paper, the authors focus on the topology control approach for efficient communications in a wireless network with multi-beam smart antennas. This...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    DEAR: Delay-Bounded Energy-Constrained Adaptive Routing in Wireless Sensor Networks

    Reliability and energy efficiency are critical issues in wireless sensor networks. In this paper, the authors study Delay-bounded Energy-constrained Adaptive Routing (DEAR) problem with reliability, differential delay, and transmission energy consumption constraints in wireless sensor networks. They aim to route the connections in a manner such that link failure does...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Integrating Routing with Content Delivery Networks

    Several research efforts are underway to associate content "Names" to the network space. There is a general belief that video and other types of cacheable content are going to continue to demand ever larger portions of a network's bandwidth. Technologies that enable network link bandwidth increases are struggling to keep...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    On Exploiting Flow Allocation With Rate Adaptation for Green Networking

    Network power consumption can be reduced considerably by adapting link data rates to their offered traffic loads. In this paper, the authors exploit how to leverage rate adaptation for green networking by studying the following flow allocation problem in wired networks: given a set of candidate paths for each end-to-end...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Energy-Efficient Collaborative Sensing With Mobile Phones

    Mobile phones with a rich set of embedded sensors enable sensing applications in various domains. In this paper, the authors propose to leverage cloud-assisted collaborative sensing to reduce sensing energy consumption for mobile phone sensing applications. They formally define a minimum energy sensing scheduling problem and present a polynomial-time algorithm...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Sensing and Probing Cardinalities for Active Cognitive Radios

    In a cognitive radio network, Opportunistic Spectrum Access (OSA) to the underutilized spectrum involves not only sensing the spectrum occupancy, but also probing the channel quality in order to identify an idle and good channel for data transmission - particularly if a large number of channels is open for secondary...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Large Families of Asymptotically Optimal Two-Dimensional Optical Orthogonal Codes

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

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Green Resource Allocation to Minimize Receiving Energy in OFDMA Cellular Systems

    Advanced cellular systems supporting ultra high traffic (e.g., 1 Gbps) utilize aggressive communication technologies to User Equipment (UE) and thus induce high-energy consumption. To reduce UE energy consumption, the authors note that in OFDMA systems, transmissions to one UE can be scheduled into fewer time slots due to multiple available...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Rate-Delay Enhanced Multipath Transmission Scheme Via Network Coding in Multihop Networks

    Distinct from the existing rate-reliability results, a novel multipath transmission scheme is proposed to enhance the rate-delay performance in multihop networks by employing network coding at the source. This scheme provides new rate-delay tradeoffs with fine granularity for rate maximization and is adaptive to Quality-of-Service (QoS) requirements. With the increasing...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    CommonCode: A Code-Reuse Platform for Wireless Network Experimentation

    Experimentation of a wireless network protocol over the air is of significant interest. However, it is more rarely performed than simulation because of the difficulties in coding and debugging as well as lack of scalability and repeatability. In this paper, the concept of a code-reuse platform making use of a...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Energy-Aware Autonomic Resource Allocation in Multitier Virtualized Environments

    With the increase of energy consumption associated with IT infrastructures, energy management is becoming a priority in the design and operation of complex service-based systems. At the same time, service providers need to comply with Service Level Agreement (SLA) contracts which determine the revenues and penalties on the basis of...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Weighted Sum Rate Maximization of Correlated MISO Broadcast Channels Under Linear Precoding: A Large System Analysis

    In this paper, the authors study the iterative Weighted Sum Rate (WSR) maximizing linear precoder algorithm proposed by Christensen et al. in large correlated MISO broadcast channels. They propose a novel approximation of the Signal-to-Interference plus Noise Ratio (SINR) at every iteration. Moreover, for independent and identical distributed channels the...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Feb 2012

    Belief Consensus Algorithms for Distributed Target Tracking in Wireless Sensor Networks

    In distributed target tracking in Wireless Sensor Networks (WSN), agreement on the target state is usually achieved by the construction and maintenance of a communication path. Such an approach lack robustness to failures, and is not applicable to asynchronous networks. Recently, methods have been proposed that can solve these problems...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Feb 2012

    A New Convergent Identity System Based on EAP-TLS Smart Cards

    In this paper, the authors present a new identity system, named SSL-Identity, working with EAP-TLS smart cards. It details an innovative technology based on tiny SSL stacks deployed in billions of such devices embedded in USB dongles or mobile phones, and comments first experimental results. SSL-Identity is convergent because it...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Oct 2010

    Evolution Towards Global Routing Scalability

    Internet routing tables have been growing rapidly due to factors such as edge-site multi-homing, traffic engineering, and disjoint address allocations. To address the routing scalability problems caused by this rapid growth, the authors propose an evolutionary approach that is incrementally deployable and provides immediate benefits to any adopting ASes. The...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2009

    Design of Versatile Academic Infrastructure for Multilayer Network Services

    In this paper, the authors describes the network design and configurations of the new Japanese academic infrastructure, called SINET3, which provides a rich variety of network services to more than 700 universities and research institutions. Since the start of full-scale operations in June 2007, the network has expanded its services...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2013

    Guest Editors' Introduction: Special Issue on Cloud Computing

    Cloud is a novel computing paradigm that builds on the foundations of distributed computing, grid computing, networking, virtualization, service orientation, and marketoriented computing. Cloud provides flexible resource allocation on demand with the promise of realizing elastic, Internet-accessible computing on a pay-as-you-go basis. Cloud services include infrastructure such as computing and...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Dec 2012

    Cloud Computing: Security Risks and Its Future

    The cloud is a next generation platform that provides dynamic resource pools, virtualization, and high availability. Today, cloud computing have the ability to utilize scalable, distributed computing environments within the confines of the Internet. This paper represent clear description of with different characteristics of cloud computing. Customers are also very...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Dec 2012

    Comparative Study of Adhoc Routing Protocols Aodv & DSR in Mobile Adhoc Network

    A Mobile Ad-hoc NETwork (MANET) is a kind of wireless ad-hoc network, and is a self configuring network of mobile routers connected by wireless links. It is a wireless network without infrastructure. Self configurability and easy deployment feature of the MANET resulted in numerous applications in this modern era. Efficient...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Dec 2012

    Autonomic Wireless Sensor Networks in Real Time Application

    Wireless ad hoc networks of sensor nodes are envisioned to be deployed in the physical environment to monitor a wide variety of real-world phenomena. Wireless Sensor Network's (WSN's) are becoming popular in military and civilian applications such as surveillance, monitoring, disaster recovery, home automation and many others. The paper presents...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Dec 2012

    An Implantable Wireless Sensor System and Transreceiver for Rf Telemetry Applications

    In this paper, the authors describe the design and implementation of wireless sensor system and low power transreceiver for the RF telemetry system. RF telemetry system having two modules: external module and internal module. The external module consists of a control unit, an inductive energy generating unit, and an RF...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Performance of Precoding Assisted Dual-Polarized Multi-Cell MIMO Downlink Communications

    Conventional uni-polarized Multiple Input Multiple Output (MIMO) antenna systems offer the advantages of higher data rate and higher reliability through the use of spatial multiplexing and space-time coding, respectively. However, the cost and space constraints have led to the use of dual-polarized MIMO antenna systems where two spatially separated uni-polarized...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Cross-Layer Dynamic Rate Adaptations for Green Cognitive Radio Networks

    The authors investigate cross-layer rate adaptation techniques for a Secondary User (SU) equipped with a finite buffer in green Cognitive Radio networks. They assume that the activity statistics of the licensed Primary Users (PUs) channels are independent and identically distributed, and a SU detects their states using a spectrum sensing...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Aug 2012

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

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

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jan 2013

    Antenna Selection in Spatial Modulation Systems

    Novel transmit antenna selection techniques are conceived for Spatial Modulation (SM) systems and their Symbol Error Rate (SER) performance is investigated. Specifically, low-complexity Euclidean Distance optimized Antenna Selection (EDAS) and Capacity Optimized Antenna Selection (COAS) are studied. It is observed that the COAS scheme gives a better SER performance than...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2011

    Efficient Zero-Forcing Based Interference Coordination for MISO Networks

    The authors consider coordination of transmission strategies in interference networks, where multiple antennas at the transmitters can be used to adjust the spatial signature of the transmitted signal. For single antenna receivers the interference power received can be constraint by so-called interference temperatures, which can be used to coordinate the...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2011

    Phase Ambiguity Quantization for Per-cell Codebook Based Limited Feedback Coordinated Multi-Point Transmission Systems

    Per-cell codebook based limited feedback strategy is desirable for Coordinated Multi-Point (CoMP) transmission system due to its scalability. In this paper, the authors study phase ambiguity quantization for centralized CoMP system with percell codebook based global channel quantization. They first analyze the performance degradation led by the phase ambiguity when...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Reinforcement Learning Strategies for Self-Organized Coverage and Capacity Optimization

    Traditional manual procedures for coverage and capacity optimization are complex and time consuming due to the increasing complexity of cellular networks. This paper presents reinforcement learning strategies for self-organized coverage and capacity optimization through antenna downtilt adaptation. The authors analyze different learning strategies for a Fuzzy Q-Learning based solution in...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2013

    Dynamic Resource Allocation for Machine-Type Communications in LTE/LTE-A with Contention-Based Access

    In this paper, the authors propose a dynamic resource allocation method to enable efficient and low-latency Machine Type Communications (MTC) in LTE/LTE-A with the Contention Based random Access (CBA) scheme. In the proposed method, they firstly estimate the probabilities of events caused by a CBA transmission and then calculate the...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2013

    Reliable Throughput for Two-way Relay Systems by Network Coding

    The throughput of wireless network can be improved by wireless network coding, without adding additional resources. However, most of the previous work focuses on the AWGN channel. In fact, the signal is subject to severe fading over wireless channel. The network coding reliable throughput of two-way system under Rayleigh fading...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2013

    Network Coding Based Reliable Broadcast Protocol in Multi-Channel Multi-Radio Wireless Mesh Networks

    Multi-Channel Multi-Radio (MCMR) Wireless Mesh Networks (WMNs) have emerged as a new paradigm in multi-hop wireless networks. In a typical MCMR WMNs, each node has multiple radios with multiple available channels on each radio, which allows nodes to have simultaneous transmissions and receptions. Therefore, network performance is improved. As a...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2013

    Group-Wise Channel Sensing and Resource Pre-Allocation for LTE D2D on ISM Band

    Device-To-Device communication has been regarded as a promising technology to improve the cellular system efficiency, which allows mobile devices communicate directly with each other on the licensed frequency resources under the control of a base station (or eNB). However, the benefits of D2D using license exempt bands, such as ISM...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2013

    A Contention-Vector Based Hybrid Scheduling Algorithm for Wireless Networks

    A good scheduling algorithm in wireless networks is the key for the efficient use of wireless medium. This paper presents a hybrid scheduling algorithm, called Contention-Vector based Hybrid Scheduling (CVHS) algorithm, for wireless networks wherein stations can sense each other. Examples of such wireless networks include Wireless LANs and small...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2013

    Network Coding with Remix Qualification for Multicasting in Delay-Tolerant Networks

    In delay-tolerant networks where connectivity between nodes is intermittent, replication-based delivery mechanisms are often employed to deliver messages in a store-carry-forward manner instead of end-to-end delivery techniques that are mainly used in traditional computer networks and Mobile Ad-hoc NETworks. However, multicasting with replication-based methodologies can induce considerable message traffic and...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2013

    Wideband MIMO Channel Capacity Analysis Based on Indoor Channel Measurement

    Based on the channel measurement in a typical indoor environment, wideband Multi-Input Multi-Output (MIMO) channel capacity analysis result is reported in this paper. A series of Non Line-Of-Sight (NLOS) and LOS measurement positions are planned for capacity comparison in different propagation conditions. For fixed received Signal-to-Noise Ratio (SNR), slight average...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    A Broadband Embedded Computing System for MapReduce Utilizing Hadoop

    An expanding wealth of ubiquitous, heterogeneous, and interconnected embedded devices is behind most of the exponential growth of the "Big Data" phenomenon. Meanwhile, the same embedded devices continue to improve in terms of computational capabilities, thus closing the gap with more traditional computers. Motivated by these trends, the authors developed...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Dec 2012

    VENTTI: A Vertically Integrated Framework for Simulation and Optimization of Networks-On-Chip

    Networks-On-Chip have been proposed to enable the integration of heterogeneous SoCs in a power-efficient and scalable way. The authors present VENTTI, a design and simulation environment that combines a virtualized platform, a NoC synthesis tool, and a library of NoC building blocks characterized at different abstraction levels. By efficiently simulating...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2012

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

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

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2011

    On Cooperative Settlement Between Content, Transit, and Eyeball Internet Service Providers

    Internet Service Providers (ISPs) depend on one another to provide global network services. However, the profit-seeking nature of the ISPs leads to selfish behaviors that result in inefficiencies and disputes in the network. This concern is at the heart of the "Network neutrality" debate, which also asks for an appropriate...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2010

    Bridging Communications and the Physical World: Sense Everything, Control Everything

    The SECE (Sense Everything, Control Everything) system allows users to create services that combine communication, calendaring, location and devices in the physical world. SECE is an event-driven system that uses a natural-English-like language to trigger action scripts. Presence updates, incoming calls, email, calendar and time events, sensor inputs and location...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Oct 2009

    Performance of Video-Chat Applications Under Congestion

    When thinking about high-speed Internet, the authors have to consider many different technologies such as ADSL, cable and satellite. Usually, for all of them the speed of the downlink and the speed of the uplink differ. For example, for ADSL it is common to have downlink speeds of 3 Mb/s...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Oct 2011

    Resource Allocation for OFDM-Based Multi-Destination Relay Networks with Direct Links

    In this paper, the authors study the joint resource allocation for the multi-destination Amplify-and-Forward relay network with direct source-to-destination links based on Orthogonal Frequency Division Multiplexing (OFDM) transmission. They aim to maximize the sum rate by jointly optimizing power allocation, subcarrier pairing, and user assignment and transmission mode classification subject...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    A Physical-Layer Network Coding Scheme Based on Linear MIMO Detection

    A Physical-layer Network Coding (PNC) scheme based on MIMO linear detection is proposed in this paper for a two-way relay channel with a multi-antenna relay. The authors apply a real-valued linear combiner to the output symbols of the MIMO linear detector to obtain a superimposed constellation for which the labeling...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2011

    Capacity and Energy Efficiency of Picocell Deployment in LTE-A Networks

    In this paper, the authors show the impact of deploying picocells on the capacity and energy efficiency of LTE-A networks. They analyze the Erlang-like capacity of a network composed of macro networks only and study the impact of introducing a number of picocells per site. Knowing that the capacity is...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2011

    An Improved Adaptive Receiver for OFDM Systems Using Conjugate Transmission

    In this paper, the authors propose an improved adaptive receiver in order to overcome the performance degradation problem encountered by the existing conjugate transmission schemes due to a time-varying frequency offset. They apply two different phase rotations on the two receiving paths instead of employing only one common phase rotation...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2011

    Low-Complexity Combining Schemes in Dual-Hop AF Relaying Systems

    In this paper, the authors investigate the performance of different low-complexity combining schemes in the context of dual-hop Amplify-and-Forward (AF) relaying networks. It is assumed that the relay uses single transmit (receive) antenna due to space limitation and to reduce the processing complexity. On the other hand, the transmitter and...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Sep 2010

    Energy-Aware Channel Selection for Cognitive Wireless Sensor Networks

    Wireless Sensor Nodes operating in unlicensed bands can exploit frequency agility in order to mitigate, through dynamic spectrum access, the effects of interference induced by collocated networks. With this respect sensor devices can select the frequency band used for their communications in an opportunistic manner: this however requires spectrum sensing...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2011

    An Energy-Efficient Distributed Relay Selection and Power Allocation Optimization Scheme over Wireless Cooperative Networks

    The authors investigate a distributed joint relay selection and power allocation scheme in wireless multi-hop cooperative networks, taking both instantaneous Channel State Information (CSI) and relay nodes' residual energy into consideration. More specific, they formulate the cooperative relaying network as a restless bandit system, which has been successfully applied in...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2010

    Joint Subcarrier and Power Allocation in Multiuser OFDM-Based Cognitive Radio Systems

    In this paper, the authors present a joint subcarrier and power allocation algorithm for multiuser Orthogonal Frequency Division Multiplexing Cognitive Radio systems, where the peak power constraint is used to protect the primary user. They first derive a rule for subcarrier allocation to maximize the sum capacity for a given...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Sep 2010

    Energy-Aware Exploitation of White Spaces in the Time Domain for Wireless Sensor Networks

    Low power communications of sensor nodes operating in unlicensed bands are easily corrupted by transmissions of collocated wireless terminals whose interference can induce packet losses and consequently increase energy consumption of sensor devices. Dynamic spectrum access mechanisms can mitigate these problems however the energy aware design of these access schemes...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Sep 2010

    ISI Analysis in Network MIMO OFDM Systems with Insufficient Cyclic Prefix Length

    The authors consider a cellular network MIMO OFDM system where cooperating base stations apply joint signal processing to the receive signals of several users. In this situation, due to geometry, the problem of unavoidable differences in time of arrival between the users' signals occurs. As a result, symbol timing offsets...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2012

    Named Data Networking for Military Communication Systems

    Many modern military communication systems rely on Internet Protocol (IP) mechanisms to provide networking functionality. In addition, mostly all of these military systems are moving towards net-centric architectures, making IP functionality vital to these networks. Despite its prodigious use, IP-type networks tend to struggle when faced with mobility. In many...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2012

    Integrating Routing with Content Delivery Networks

    Several research efforts are underway to associate content "Names" to the network space. There is a general belief that video and other types of cacheable content are going to continue to demand ever larger portions of a network's bandwidth. Technologies that enable network link bandwidth increases are struggling to keep...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2012

    Firewall Fingerprinting

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

    Provided By Institute of Electrical and Electronics Engineers