Institute of Electrical and Electronics Engineers

Displaying 201-240 of 8702 results

  • White Papers // Nov 2012

    Optimal Algorithms for Near-Hitless Network Restoration via Diversity Coding

    Diversity coding is a network restoration technique which offers near-hitless restoration, while other state-of-the-art techniques are significantly slower. Furthermore, the extra spare capacity requirement of diversity coding is competitive with the others. Previously, the authors developed heuristic algorithms to employ diversity coding structures in networks with arbitrary topology. This paper...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Resource Constrained Failure Management in Networked Computing Systems

    The authors examine the problem of fault detection in networked computing systems and highlight the tradeoff between diagnosing/reacting to potentially harmful real-time events and minimizing the number of times the system is reset or scanned for malicious activity. The various health states of a system are modeled as states in...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    A Reliability Analysis of Datacenter Topologies

    The network infrastructure plays an important role for datacenter applications. Therefore, datacenter network architectures are designed with three main goals: bandwidth, latency and reliability. This paper focuses on the last goal and provides a comparative analysis of the topologies of prevalent datacenter architectures. Those architectures use a network based only...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Multiplexing-Diversity Balanced Cooperative Wireless Cellular Networks Based on Alamouti Space Time Code for Multimedia Transmission

    In this paper, an Alamouti space time based cooperative wireless cellular network for multimedia transmission is proposed. According to various requirements of text, voice, image, video or medical signal transmissions, this multiplexing-diversity balanced structure is provided for such comprehensive multimedia transmission in wireless cellular networks. Simulation results of this Alamouti...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Achieving Quality of Service via Packet Distribution Shaping

    Conventional Quality of Service (QoS) for multimedia networking applications are typically specified by a certain set of requirements on latency, jitter, bandwidth, and packet loss rate. In this paper, the authors introduce a novel approach to QoS via the notion of distribution shaping in which a pre-specified distribution of packets...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Quality-optimized Downlink Scheduling for Video Streaming Applications in LTE Networks

    As the next generation of all-IP mobile communication system, LTE offers unprecedented data transmission speed and low latency for a variety of applications and services. However efficient QoS provisioning for wireless networks is challenging due to unreliable and resource-constrained radio interface. In this paper, the authors investigate the important downlink...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    On Multi-stream Multi-source Multicast Routing

    Multicasting is an efficient way to deliver multimedia content (streaming, for instance) to different locations in the network. While end-to-end real-time constraints are important for interactive applications, sustained availability of bandwidth is more important to the destinations for multimedia streaming. In this paper, the authors address the problem of Multi-stream...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Achieving Quality of Service with Adaptation-based Programming for Medium Access Protocols

    Designing network protocols that work well under a variety of network conditions typically involves a large amount of manual tuning and guesswork, particularly when choosing dynamic update strategies for numeric parameters. The situation is made more complex by adding the Quality of Service (QoS) requirements to a network protocol. A...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Improving QoE for Skype Video Call in Mobile Broadband Network

    In this paper, the authors introduce an app-radio cross-layer framework for improving Quality of user Experience (QoE) of Over-The-Top (OTT) Internet applications in Mobile Broadband Networks, e.g. WiMAX, 3G, LTE, etc. They apply methods similar to the well-known network layer techniques: Explicit Congestion Notification (ECN) and Differentiated Services (DiffServ) to...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Adaptive Video Pacing Method Based on the Prediction of Stochastic TCP Throughput

    Many of the video streaming services on the Internet and mobile networks use HTTP/TCP for video transport. Video streaming clients are generally designed to download a sufficient amount of data to avoid playback interruption caused by the lower TCP throughput. Storing more video data than necessary may generate a large...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Availability Analysis of Cloud Computing Centers

    Accurate availability and performance analysis are important requirements to guarantee Quality of Services (QoS) for cloud users. In this paper, the authors integrate an availability model in overall analytical sub-models of cloud system. Each sub-model captures a specific aspect of cloud centers. The key performance metrics such as task blocking...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Empirical QoE/QoS Correlation Model based on Multiple Parameters for VoD flows

    The Quality of Experience (QoE) determines the user satisfaction degree of communication services. Quantifying the relationship between User QoE and Network Quality of Service (QoS) enables the services providers to estimate the contribution of network performance in overall user satisfaction. Based on the Multiple Linear Regression (MLR) and the exponential...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Toward continuous push-based P2P live streaming

    Due to unpredictable peer churns (joins, leaves and failures), it is challenging to offer video continuity in Peer-to-Peer (P2P) live streaming. In this paper, the authors study a push-based P2P network formed by unreliable nodes (i.e., nodes which may churn at any time). To achieve high stream continuity, the video...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    A Study on Peer Startup Process and Initial Offset Placement in P2P Live Streaming Systems

    In this paper, the authors measure and study the peer startup process in PPLive, a popular commercial P2P streaming system, and focus on a fundamental issue in this aspect: how a peer initializes its buffer when it joins a channel, i.e., initial offset placement of peers' buffers in the startup...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Peer Selection in P2P File Sharing Systems over Mobile Cellular Networks with Consideration of Downlink Bandwidth Limitation

    In P2P file sharing systems over mobile cellular networks, the bottleneck of file transfer speed is usually the downlink bandwidth of the receiver rather than the uplink bandwidth of the senders. In this paper the authors consider the impact of downlink bandwidth limitation on file transfer speed and propose two...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    On Providing Bounded Delay Service to Subscribers in P2P Live Streaming Systems

    It is challenging to provide delay-bounded service in a large-scale P2P live streaming system since a P2P streaming system is not scalable from the perspective of playback delay. However, certain peers called subscribers are more sensitive to playback delay than other peers, and the violation of the delay bound dramatically...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Understanding the Topologies of BitTorrent Networks: A Measurement View

    BitTorrent (BT) is one of the most popular Peer-to-Peer (P2P) network applications. Most characteristics (except the topology) of BT network have been examined extensively by measurement approaches. In this paper, the authors deploy a measurement system to study the performance-related properties of BT topologies. They also use their measurement system...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    A Playback Length Changeable Chunk Scheduling Algorithm for SVC based P2P Streaming Systems

    The PLCS (Playback Length Changeable Segmentation) algorithm was proposed to improve the success delivery rate of chunks in some important layers including the base layer for SVC based P2P streaming systems. In this paper, the authors make further research and propose a corresponding chunk scheduling algorithm named PLCCS (Playback Length...

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  • White Papers // Nov 2012

    General BER Expression for One-Dimensional Constellations

    A novel general ready-to-use Bit-Error Rate (BER) expression for one-dimensional constellations is developed. The BER analysis is performed for bit patterns that form a labeling. The number of patterns for equally spaced M-PAM constellations with different BER is analyzed. Current wireless communication systems are based on the Bit-Interleaved Coded Modulation...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    New Approximations to the Lognormal Characteristic Function

    Computation of the log normal Characteristic Function (CF) is required in analysis of many wireless communication systems. No closed-form expression exists for the log normal CF. In this paper, two approximations to the log normal CF are derived. The approximations are accurate over specified ranges of parameters. The first approximation...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    On the Outage Throughput Capacity of Hybrid Wireless Networks over Fading Channels

    In this paper, the authors investigate the problem of how much information can be transported over hybrid wireless networks, in which a wired network of base stations is deployed to support long-range communications between wireless nodes. This paper is the effect of fading on such hybrid wireless networks. To effectively...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Coverage Probability of Uplink Cellular Networks

    The cellular uplink has typically been studied using simple Wyner-type analytical models where interference is modeled as a constant or a single random variable, or via complex system-level simulations for a given set of parameters, which are often insufficient to evaluate performance in all operational regimes. In this paper, the...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Transmission Capacities for Overlaid Wireless Networks with Spatial Multiplexing

    In this paper, the authors investigate the performance of open-loop spatial multiplexing in overlaid ad hoc networks. Based on a stochastic geometry model, they derive exact closed-form expressions for the transmission capacity of two coexisting networks (a primary network vs. a secondary network) employing spatial multiplexing with Zero-Forcing (ZF) receivers....

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Outage Minimization in Fading Channels: Optimal Power Allocation with Channel Distribution Information Known at Transmitter

    This paper revisits the optimal power allocation for outage minimization in the classic point-to-point fading channels with the Channel Distribution Information (CDI) known at the transmitter. The channel state information (CSI) is assumed to be perfectly known at the receiver, but not available at the transmitter. In particular, the authors...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Asymptotically Optimal Channel Feedback Protocol Design for Cognitive Multiple Access Channels

    In cognitive multiple access networks, primary secondary feedback links are needed to convey Secondary Transmitter Primary Base station (STPB) channel gains from the Primary Base Station (PBS) to the Secondary Base Station (SBS). To reduce the amount of feedback exchange between PBS and SBS, this paper proposes a feedback control...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Interference Alignment with Rate Splitting in a Three-user Interference Channel with a Cognitive Transmitter

    This paper proposes a new strategy combining Interference Alignment (IA) and rate splitting for a three user interference channel with a cognitive transmitter. Although a half of available dimensions are sacrificed to align interference signals from other users in conventional IA, the proposed scheme recycles the sacrificed dimensions with the...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Flexible Duplex for Cognitive Femtocells in Two-Tier Networks

    Small cell network architecture is considered as an effective solution to the ever growing demand for high data rate, with femtocells being a promising paradigm. The dense deployment and the uncoordinated operation of femtocells bring various challenges for interference management. Motivated by the flexible sub-channel allocation capabilities of cognitive radio,...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Phase Asynchronous Cognitive Interference Channels: Lossless Source-Channel Separation Theorems

    Sufficient and necessary conditions for reliable lossless communication of two correlated sources over classes of phase asynchronous cognitive interference channels are derived. Namely, the authors consider interference channels in which one of the encoders, i.e., the secondary or cognitive user, is causally or non-causally aware of the other's message. Moreover,...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    SEP-Optimal Antenna Selection for Average Interference Constrained Underlay Cognitive Radios

    In the underlay mode of cognitive radio, secondary users can transmit when the primary is transmitting, but under tight interference constraints, which limit the secondary system performance. Antenna Selection (AS)-based multiple antenna techniques, which require less hardware and yet exploit spatial diversity, help improve the secondary system performance. In this...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Impact of Imperfect Channel State Information on the Performance of Wireless Sensor Networks

    The performance of Wireless Sensor Networks (WSN) is often assessed without paying close attention to the effects of channel state information recovery, which is assumed to be exactly known. This paper focuses on the effects of imperfect knowledge of the channel state information on a WSN whose sensors measure a...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Training Sequence Design for Data-Aided Synchronization of Burst-Mode CPM

    In this paper, the authors study the Cramer-Rao Bound (CRB) for Continuous Phase Modulation (CPM) signals. Based on the CRB computations, they propose the optimum training sequence for joint estimation of carrier phase, frequency set and symbol timing. Their proposed training sequence is optimum in the sense that it minimizes...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Pilot Design and Channel Estimation for Uplink Block Spread CDMA

    In this paper, the authors propose the pilot design and channel estimation schemes for uplink Block-Spread Code Division Multiple Access (BS-CDMA) systems. In particular, they propose the use of a common spreading code to spread the pilot signals of all users such that a high bandwidth efficiency is achieved. The...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Orthogonal Training Signal Relaying for Channel Estimation in Dual-Hop AF Relay Networks

    In this paper, an orthogonal training signal relaying technique for channel estimation in a dual-hop Amplify and Forward (AF) relay network with multiple relays is proposed. In an existing technique, the cross interference occurs between the precoded training signals of the relays since their precoded noise vector terms are not...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    How Useful is Adaptive Action?

    Channels with action-dependent states, as defined in, are considered. While investigated the scenario of message dependent non-adaptive action sequences, this paper focuses on adaptive action sequences, where the action is a strictly causal function of the message and the state sequences. The capacity of such a channel is characterized for...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    A Rate-Maximizing Channel-Shortening Detector with Soft Feedback Side Information

    In this paper, the authors present a novel approach for the design of rate-maximizing channel shortening detectors with soft feedback side information for frequency-selective channels. The detector is a soft-input soft-output detector and constitutes one of the components of an iterative receiver. The design optimization is performed from an information-theoretic...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    On Analysis of Wireless Uplink using Analog Network Coding with Non-Coherent Modulations

    Analog Network Coding (ANC) has been widely used in wireless uplink to improve throughput and provide spatial diversity. However, the receiver has to estimate the channel coefficients of all users to perform coherent detection, thus the signaling overhead is sometimes formidable and may even outweigh the performance gain. To reduce...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    A Simple Non-Coherent Physical-Layer Network Coding for Transmissions Over Two-Way Relay Channels

    Physical-layer Network Coding (PNC) can effectively improve the overall throughput of a multi-hop cooperative network communicating over two-way relay channels. In this contribution, the authors present a novel non-coherent/differential PNC scheme, which inherits the advantages provided by conventional PNC. They show that, although the assisting relay node has no access...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    On the Feasibility of Network Alignment for Three-Source Three-Destination Multiple Unicast Networks with Delays

    The notion of Network Coding was introduced in where the capacity of wireline multicast networks is characterized. Scalar linear network coding was found to achieve the capacity of multicast networks. In the meanwhile, it was shown that there exist solvable non-multicast networks where scalar linear network coding is insufficient. In...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Precoder Design for Weighted Sum Delay Minimization in MIMO Physical Layer Multicasting

    This paper considers the design of linear transmit precoding schemes to minimize the weighted sum delay metric over a K-user multi-antenna multicast channel. Limited by the rank and power constraints, the precoding matrices are designed under two interesting scenarios. The first scenario assumes the availability of pilots that can be...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Physical Layer Network Coding for Two-Way Relaying with QAM and Latin Squares

    In the design of modulation schemes for the physical layer network-coded two way relaying scenario with two phases (Multiple Access (MA) Phase and BroadCast (BC) Phase), it was observed by Koike-Akino et al. that adaptively changing the network coding map used at the relay according to the channel conditions greatly...

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  • White Papers // May 2009

    Opportunistic Underlay Transmission in Multi-Carrier Cognitive Radio Systems

    Underlay transmission in cognitive radio enables a secondary (unlicensed) system to utilize a frequency band of primary (licensed) system as long as the unlicensed interferes less than a certain threshold with the licensee. The secondary system needs to carefully consider not only its own channel to achieve a capacity gain...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Oct 2008

    A Comparison of FDD and TDD/TDMA Architectures for Airborne Backbone Network Traffic

    An important aspect of extending the DOD GIG into the tactical battle-space will be the development of high capacity airborne backbone IP networks. Properly designing and provisioning these networks is critically dependent on the statistical characteristics of the data flows that these networks will encounter. This paper studies the architecture...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Oct 2008

    On Providing Seamless Handoff in Ad Hoc Networks With Wireless Heterogeneity

    In this paper, the authors have presented an integrated architecture for seamless soft handoff in mobile ad hoc networks and demonstrated the good performance via showing that their handoff scheme can provide equivalent results as the benchmark with no handoff. In this position paper, they aim to investigate the general...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jan 2012

    An Integrated Robust and Auto-Configurable Network Service Protocol Suite for Airborne Networks

    The key contribution of the work herein described is an integrated network service architecture for Airborne Networks (ANs), wherein a set of robust and auto-configurable network service mechanisms are designed to handle network dynamics and bandwidth constraints in AN environments. Instead of covering all possible network services, address configuration and...

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  • White Papers // Oct 2008

    Hardware-Efficient Encryption Encoder and Decoder Unit

    The distribution and retrieval of multimedia data over wireless networks have become widespread, thus creating the need for secure transmission of data over networks. However, one of the main problems with the secure transmission of digital data over wireless networks is that the errors that occur during transmission typically need...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Oct 2008

    Impact of Channel Estimation Error on Decentralized Detection in Bandwidth Constrained Wireless Sensor Networks

    In this paper, the authors consider the problem of fusing decisions in a distributed detection system when the local binary decisions made at the sensors are transmitted over wireless links subject to fading and noise. They consider a training based channel estimator with which the Fusion Center (FC) estimates the...

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  • White Papers // Oct 2008

    Channel Estimation and Equalization for CE-OFDM in Multipath Fading Channels

    In OFDM, the orthogonal subcarriers can be assumed to undergo flat fading in a frequency selective channel permitting operation without an equalizer especially when differential data encoding is used. However, in CE-OFDM, the data symbols are no longer confined to orthogonal subcarriers and, therefore, an equalizer is required for operation...

    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

    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...

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  • White Papers // Nov 2011

    Leveraging Multi-User Diversity, Channel Diversity and Spatial Reuse for Efficient Scheduling in Wireless Relay Networks

    A wireless relay network is composed of a Base Station (BS), a few Relay Stations (RSs) and a large number of Mobile Stations (MSs). The BS serves as a gateway connecting the network to external networks such as the Internet. A spanning tree rooted at the BS is formed for...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jan 2012

    Wakeup Scheduling in Roadside Directional Sensor Networks

    In this paper, the authors focus on a roadside directional sensor network where sensors with directional Field Of Views (FOVs) are placed along a roadway. They study the problem of wakeup scheduling, with the objective of maximizing network lifetime under the constraint that full coverage and network connectivity are maintained...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jan 2012

    Relay Beam Selection With Directional Antennas

    Relay Stations (RSs) can be deployed in a wireless network to extend its coverage and improve its capacity. Smart (directional) antennas can enhance the functionalities of RSs by forming one or multiple beams only towards intended receivers. In this paper, the authors focus on the topology control approach for efficient...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Sep 2009

    Pre-Filtering of Self-Encoded Spread Spectrum in Dense Multipath Channels

    The authors present pre-filtering methods of SElf-encoded Spread Spectrum (SESS) in dense multipath channels. SESS eliminates the need for traditional transmit and receive Pseudo Noise (PN) code generators. In this paper, they propose multipath management of SESS in dense multipath urban environments. They propose a transmitter pre-filtering method that retains...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Aug 2011

    Optimal Symbol-by-Symbol Costa Precoding for a Relay-Aided Downlink Channel

    In this paper, the authors consider practical approaches to Costa pre-coding (also known as dirty paper coding). Specifically, they propose a symbol-by-symbol scheme for cancellation of interference known at the transmitter in a relay-aided downlink channel. For finite-alphabet signaling and interference, they derive the optimal (in terms of maximum mutual...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Dec 2008

    Development and Performance Evaluation of a Flexible, Low Cost MANET

    Performance evaluations of multi-hop ad hoc network routing protocols have been primarily conducted through analytic and simulation-based studies, which frequently fail to accurately predict real-world performance and behavior. One reason for this is the challenge in developing low cost, representative test beds with the degree of flexibility and mobility required....

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Oct 2008

    Performance Analysis of Multi-Hop IEEE 802.11 DCF Backhaul Networks

    Because of the wide deployment of 802.11 equipments in the past decade, current applications are not limited anymore to only single Access Points (AP) deployments for indoor usage, but have been extended to multi-hop networks to fulfill the need of high speed connectivity in mobile environments, where the analysis of...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Sep 2008

    Cooperative Communication in Space-Time-Frequency Coded MB-OFDM UWB

    Though cooperative communication has been intensively examined for general wireless systems, such as mobile and ad-hoc networks, it has been almost unexplored in the case of Space-Time-Frequency Coded Multi-Band OFDM Ultra-WideBand (STFC MB-OFDM UWB). This paper proposes a framework of cooperative communication in such systems where nodes are equipped with...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2011

    Artificial Immune System Based Image Pattern Recognition in Energy Efficient Wireless Multimedia Sensor Networks

    In Wireless Multimedia Sensor Networks (WMSNs), low cost Complementary Metal Oxide Semiconductor (CMOS) camera sensors may only produce low resolution images due to hardware limitations. However, super-resolution images may be constructed from these low resolution images in a multiple sensor network, improving object pattern recognition success rates. There is a...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Oct 2008

    Energy-Constrained Distortion Reduction Optimization for Wavelet-Based Coded Image Transmission in Wireless Sensor Networks

    Image transmissions in Wireless Multimedia Sensor Networks (WMSNs) are often energy constrained. They also have requirement on distortion minimization, which may be achieved through Unequal Error Protection (UEP) based communication approaches. In related paper with regard to wireless multimedia transmissions, significantly different importance levels between image-pixel-position information and image-pixel-value information...

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  • White Papers // Mar 2011

    Throughput Vs. Distance Tradeoffs and Deployment Considerations for a Multi-Hop IEEE 802.16e Railroad Test Bed

    Throughput vs. distance analysis and coverage requirements is critical issues in planning wireless network deployments. With the recent availability of IEEE 802.16e and its promise of larger coverage areas for high-speed data communication, evaluating it in a real-world environment is very important to one in the authors' ongoing study of...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Sep 2009

    Effect of Sample Timing on LS Channel Estimation

    As block coding and intelligent receiver combining in multi-antenna systems moves from the theoretical into the physical domain, it is necessary to apply robust analysis to the problems encountered with the development of real radio systems that are often overlooked during theoretical development of methods and processes. One such problem...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jul 2010

    Host-to-Host Congestion Control for TCP

    The Transmission Control Protocol (TCP) carries most Internet traffic, so performance of the Internet depends to a great extent on how well TCP works. Performance characteristics of a particular version of TCP are defined by the congestion control algorithm it employs. This paper presents a survey of various congestion control...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2011

    Mobile Relay Configuration in Data-Intensive Wireless Sensor Networks

    Wireless Sensor Networks (WSNs) are increasingly used in data-intensive applications such as micro-climate monitoring, precision agriculture, and audio/video surveillance. A key challenge faced by data-intensive WSNs is to transmit all the data generated within an application's lifetime to the base station despite the fact that sensor nodes have limited power...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Aug 2011

    Data Replication in Data Intensive Scientific Applications With Performance Guarantee

    Data replication has been well adopted in data intensive scientific applications to reduce data file transfer time and bandwidth consumption. However, the problem of data replication in Data Grids, an enabling technology for data intensive applications, has proven to be NP-hard and even non approximable, making this problem difficult to...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2011

    The Effects of Active Queue Management and Explicit Congestion Notification on DNS Traffic

    Active Queue Management (AQM) and Explicit Congestion Notification (ECN) are two methods that attempt to alleviate the problems of FIFO queues and of packet drops for congestion indication respectively. Random Early Detection (RED) is the most popular AQM method. The Domain Naming System (DNS) protocol is a core Internet protocol...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2011

    A Distributed and Scalable Time Slot Allocation Protocol for Wireless Sensor Networks

    There are performance deficiencies that hamper the deployment of Wireless Sensor Networks (WSNs) in critical monitoring applications. Such applications are characterized by considerable network load generated as a result of sensing some characteristics of the monitored system. Excessive packet collisions lead to packet losses and retransmissions, resulting in significant overhead...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2011

    Data Delivery Properties of Human Contact Networks

    Pocket Switched Networks take advantage of social contacts to opportunistically create data paths over time. This work employs empirical traces to examine the effect of the human contact process on data delivery in such networks. The contact occurrence distribution is found to be highly uneven: contacts between a few node...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2011

    Dynamic Time Slot Partitioning for Multimedia Transmission in Two-Hop Cellular Networks

    In recent years, there has been an exponential increase in the number of mobile phone users. In addition, a significant growth in the demand for high-rate multimedia services over wireless networks, such as video conferencing, multimedia streaming, etc., was noted. Different solutions were proposed to support high-quality high data rate...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2011

    Fast Detection of Mobile Replica Node Attacks in Wireless Sensor Networks Using Sequential Hypothesis Testing

    Due to the unattended nature of wireless sensor networks, an adversary can capture and compromise sensor nodes, make replicas of them, and then mount a variety of attacks with these replicas. These replica node attacks are dangerous because they allow the attacker to leverage the compromise of a few nodes...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2011

    Endpoint-Based Call Admission Control and Resource Management for VoWLAN

    This paper examines two specific aspects of resource management in Wireless Local Area Networks (WLANs) - Call Admission Control (CAC) and handling of Link Adaptation (LA) events. A self-consistent system to manage these for Voice over Internet Protocol (VoIP) over an IEEE 802.11 WLAN is presented. The proposed CAC scheme...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2011

    Efficient Location Training Protocols for Heterogeneous Sensor and Actor Networks

    In this paper, the authors consider a large-scale geographic area populated by tiny sensors and some more powerful devices called actors, authorized to organize the sensors in their vicinity into short-lived, actor-centric sensor networks. The tiny sensors run on miniature non-rechargeable batteries, are anonymous, and are unaware of their location....

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2011

    Processing Continuous Range Queries With Spatiotemporal Tolerance

    Continuous queries are often employed to monitor the locations of Mobile Objects (MOs), which are determined by sensing devices like GPS receivers. In this paper, the authors tackle two challenges in processing Continuous Range Queries (CRQs): coping with data uncertainty inherently associated with location data, and reducing the energy consumption...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Feb 2011

    Secret Key Establishment Using Temporally and Spatially Correlated Wireless Channel Coefficients

    When implementing data encryption and decryption in a symmetric cryptosystem, secure distribution of the secret key to legitimate nodes can be a challenge. In this paper, the authors consider establishing secret keys using the common wireless channel, with particular emphasis on the spatial and temporal correlations of the channel coefficients....

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2011

    Temporal Link Signature Measurements for Location Distinction

    The authors investigate location distinction, the ability of a receiver to determine when a transmitter has changed location, which has application for energy conservation in wireless sensor networks, for physical security of radio-tagged objects, and for wireless network security in detection of replication attacks. In this paper, they investigate using...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2011

    Towards Realizable, Low-Cost Broadcast Systems for Dynamic Environments

    A main design issue in a wireless data broadcasting system is to choose between push-based and pull-based logic: the former is used as a low-cost solution, while the latter is preferred when performance is of utmost importance. Therefore, the most significant advantage of a push system is the minimal cost....

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  • White Papers // Feb 2011

    ROC: Resilient Online Coverage for Surveillance Applications

    The authors consider surveillance applications in which sensors are deployed in large numbers to improve coverage fidelity. Previous research has studied how to select active sensor covers (subsets of nodes that cover the field) to efficiently exploit redundant node deployment and tolerate unexpected node failures. Little attention was given to...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2011

    On the Complexity of the Regenerator Placement Problem in Optical Networks

    Placement of regenerators in optical networks has attracted the attention of recent research works in optical networks. In this problem, the authors are given a network with an underlying topology of a graph and with a set of requests that correspond to paths in. There is a need to put...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2011

    Measuring Multipath Routing in the Internet

    Tools to measure Internet properties usually assume the existence of just one single path from a source to a destination. However, load-balancing capabilities, which create multiple active paths between two end-hosts, are available in most contemporary routers. This paper extends Paris trace-route and proposes an extensive characterization of multipath routing...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Feb 2011

    Network-Coding Multicast Networks With QoS Guarantees

    It is well-known that without admission control, network congestion is bound to occur. However, to implement admission control is difficult in IP-based networks, which are constructed out of the end-to-end principle, and semantics of most major signaling protocols can only be interpreted at the edge of the network. Even if...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2011

    Local Restoration With Multiple Spanning Trees in Metro Ethernet Networks

    Ethernet is becoming a preferred technology to be extended to Metropolitan Area Networks (MANs) due to its low cost, simplicity, and ubiquity. However, current Ethernet lacks a fast failure recovery mechanism as it reconstructs the spanning tree after the failure is detected, which commonly requires tens of seconds. Some fast...

    Provided By Institute of Electrical and Electronics Engineers