Institute of Electrical and Electronics Engineers

Displaying 121-160 of 7585 results

  • 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...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Finding Three Transmissions is Hard

    The authors investigate a fundamental wireless broadcast problem called Index coding. They focus on binary linear scalar index coding problems when it is a-priori known that the optimal solution requires three transmissions. For this case, they characterize the relation of the clique cover number of the side information graph G...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Throughput Regions for Fading Interference Channels under Statistical QoS Constraints

    Communication over fading interference channels in the presence of statistical Quality of Service (QoS) constraints is considered. Effective capacity, which provides the maximum constant arrival rate that a given service process can support while satisfying statistical queuing constraints, is employed as the performance metric. In a two-user and buffer constrained...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Analog Multitone with Interference Suppression: Relieving the ADC Bottleneck for Wideband 60 GHz Systems

    Commercial exploitation of the large amounts of unlicensed spectrum available at 60 GHz requires that the authors take advantage of the low-cost Digital Signal Processing (DSP) made available by Moore's law. A key bottleneck, however, is the cost and power consumption of high-precision Analog-to-Digital Converters (ADCs) at the multiGigabit rates...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    On Optimal Ergodic Interference Alignment

    The original ergodic interference alignment scheme proposed by Nazer et al. requires symmetric channel phase distribution. In this paper, the authors investigate a new ergodic interference alignment scheme which can achieve one half interference-free Degree of Freedom (DoF) for arbitrary phase distribution. Even for symmetric phase distributions, the new scheme...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    The Performance of Successive Interference Cancellation in Random Wireless Networks

    This paper provides a unified framework to study the performance gain of Successive Interference Cancellation (SIC) in d-dimensional interference-limited networks with arbitrary fading distribution and power-law path loss. The authors derive bounds on the mean number of users that can be successively decoded and the probability of successively decoding k...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Uplink Multicell Processing with Limited Backhaul via Successive Interference Cancellation

    This paper studies an uplink multicell joint processing model in which the base-stations are connected to a centralized processing server via rate-limited digital backhaul links. Unlike previous studies where the centralized processor jointly decodes all the source messages from all base-stations, this paper proposes a suboptimal achievability scheme in which...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Towards the Feasibility Conditions for Linear Interference Alignment with Symbol Extensions: A Diversity Constraint

    The authors explore the feasibility of linear interference alignment using finite signaling dimensions and symbol extensions. In the non-zero total intersection regime, they show that the number of sources is upper bounded by a function of channel diversity. The available diversity places a fundamental constraint on the number of signal...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Joint Compute and Forward for the Two Way Relay Channel with Spatially Coupled LDPC Codes

    The authors consider the design and analysis of coding schemes for the binary input two way relay channel with erasure noise. They focus on reliable physical layer network coding in which the relay performs perfect error correction prior to forwarding messages. The best known achievable rates for this problem can...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Wireless Index Coding

    The authors explore Degrees of Freedom (DoF) characterizations of partially connected wireless networks, especially cellular networks, with no channel state information at the transmitters (no CSIT), and show that the problem is intimately connected to the index coding problem typically considered in network coding literature, albeit with significant additional constraints...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Secret Key Agreement for Cooperative Wireless Communications: Bounds and Efficient Protocol Design

    The authors study practical information-theoretically secure secret key agreement protocol design for wireless cooperative communication networks. By assuming the relay selection process is finished in advance, they study the key agreement problem for a classical three-node cooperative wireless communication system over independent Additive White Gaussian Noise (AWGN) channels. Passive attacks...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Outage Secrecy Rate in Wireless Relay Channels Using Cooperative Jamming

    A wireless relay channel is considered, consisting of a multi-antenna source, a single-antenna destination, a single antenna eavesdropper and a set of multi-antenna relays (helpers) that act as jammers to the eavesdropper. Each helper knows only its own link to the receiver and independently transmits jamming noise, lying in the...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Power Assignment in Multi-relay Adaptive DF Cooperative Networks

    The authors investigate a power assignment scheme in multirelay adaptive Decode-and-Forward (DF) cooperative-diversity networks over non-identical Rayleigh fading channels, that integrates truncated Automatic Repeat-reQuest (ARQ) at the link layer. At the cooperative level, only the reliable relays participate in the retransmission phase if necessary. In this paper, they aim at...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    On the Achievable Degrees of Freedom of Partially Cooperative X Networks with Delayed CSIT

    In multi-user wireless communications, the knowledge of Channel State Information at Transmitters (CSIT) is important for the multiplexing gain (or degrees of freedom). For example, consider a K-user (K x K X networks) X network with K single-antenna transmitters and K single-antenna receivers, where each transmitter intends to send an...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Degrees of Freedom of 2-user and 3-user Rank-Deficient MIMO Interference Channels

    The authors study the Degrees of Freedom (DoF) of 2-user and 3-user Multiple Input Multiple Output (MIMO) interference channels with rank deficient channel matrices. Only achievable DoF results and trivial outer bounds were previously available for these problems, restricted to symmetric settings. For the 2- user rank deficient MIMO interference...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Performance Analysis of Distributed MIMO Systems in Rayleigh/Inverse-Gaussian Fading Channels

    In this paper, the authors pursue a performance evaluation of distributed Multiple-Input Multiple-Output (MIMO) systems in composite Rayleigh/Inverse-Gaussian fading channels. Capitalizing on some generic bounding techniques, they first derive new closed-form bounds on the ergodic capacity of optimal receivers. In order to gain useful insights into the impact of fading...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    On the Asymptotic Sum-Rate of Uplink MIMO Cellular Systems in the Presence of Non-Gaussian Inter-Cell Interference

    In this paper the authors consider a scenario, where several mobile multi-antenna terminals communicate with a multiantenna base station within a cellular communication system over the flat Rayleigh fading channel. In addition, several terminals from the neighboring cell cause interference. For such a scenario, they derive, using the replica method,...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Optimal MIMO Transmission with Per-antenna Power Constraints

    Many MIMO capacity analyses and precoding algorithms are obtained based on the assumption of total power constraint while assuming power can be allocated freely across antennas. In practical MIMO systems, however, per antenna power constraints are often more predominant design consideration than the total power constraints. In this paper, the...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Cross-Layer Design of Energy Efficient Coded ARQ Systems

    The energy efficient design of coded Automatic Repeat-reQuest (ARQ) systems is studied in this paper. The optimization aims to minimize the energy required for the successfully delivery of one information bit from a transmitter to a receiver. The design is performed by incorporating a wide range of practical system parameters...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    New PMEPR Bounding Analysis for Coded OFDM Transmitters

    In this paper, the authors derive the PMEPR upper bound for the concatenation of OFDM (Orthogonal Frequency-Division Multiplexing) sequences. This new study enables people to construct the longer OFDM sequences from the shorter ones. They investigate how the PMEPR (Peak-to-Mean-Envelope-Power Ratio) upper bound changes as sequences of different lengths and...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Efficient Concatenated Coding Schemes for Error Floor Reduction of LDPC and Turbo Product Codes

    This paper introduces a novel Serial Code Concatenation (SCC) scheme to combat the error floor problem experienced in iterated sparse graph-based error correcting codes such as Turbo Product (TP) codes and Low Density Parity Check (LDPC) codes. SCC has been widely used in the past to reduce the error floor...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Strategies for Distributed Sensor Selection Using Convex Optimization

    Consider the estimation of an unknown parameter vector in a linear measurement model. Centralized sensor selection consists in selecting a set of ks sensor measurements, from a total number of m potential measurements. The performance of the corresponding selection is measured by the volume of an estimation error covariance matrix....

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Semidefinite Relaxation and Randomization for Dynamic Cell Association in Heterogeneous Networks

    In this paper, the authors consider a heterogeneous network with one macro node and one pico node. They are concerned with the problem of associating users in the macro cell, to either the macro node or the pico node, in order to maximize the sum rate in the downlink. They...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Capacity of Scale Free Wireless Networks

    The authors study the impact of social connectivity on the capacity of wireless networks by considering different values of concentration factor and degree dispersion in scale-free networks. The result shows that a capacity similar to Gupta and Kumar is achieved. Further investigation reveals that traditional transport capacity definition provides misleading...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    On the Capacity Region of the Gaussian MAC with Batteryless Energy Harvesting Transmitters

    The authors consider the two-user additive Gaussian Multiple Access Channel (MAC) where the transmitters communicate by using energy harvested from nature. Energy arrivals of the users are i.i.d. in time, and for any given time, they are distributed according to a joint distribution. Energy arrivals cause time variations for the...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Coordinated Multi-Point Transmission with Quantized and Delayed Feedback

    Coordinated Multi-Point (CoMP) techniques for LTE-Advanced systems promise high spectral efficiency and enhanced coverage; however, the performance of such systems heavily depends on the feedback quality. In this paper, the authors study the impact of quantized and delayed feedback on the achievable rate of CoMP systems. They first derive closed-form...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Device-to-Device Collaboration through Distributed Storage

    Video is the main driver for the inexorable increase in wireless data traffic. In this paper the authors analyze a new architecture in which Device-to-Device (D2D) communications is used to drastically increase the capacity of cellular networks for video transmission. Users cache popular video files and after receiving requests from...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Spatio-Temporal Information Coupling in Cooperative Network Navigation

    The availability of reliable positional information is a key enabler for numerous emerging location-based applications. Network navigation via joint spatial and temporal cooperation can provide mobile nodes with high-accuracy and robust positional information. Meanwhile, this joint cooperation incurs intricate information acquisition due to the correlation in inferred nodes' position, referred...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Performance of Pico-Cell Clusters with Cooperative Receivers

    Pico-cell clusters have been proposed for providing high capacities to dense sets of users in next generation networks. The authors consider the uplink channel and analyze the sum-rate performance of two interfering pico-cell clusters with cooperative Multi-cell Joint Decoding (MJD). The performance of a linear receiver is compared with that...

    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 // Nov 2012

    On The Reduction of Power Loss Caused by Imperfect Spectrum Sensing in OFDMA-Based Cognitive Radio Access

    Cognitive Radio provides a promising solution for the spectrum scarcity in wireless systems. The main stage of a successful cognitive transmission is the spectrum sensing stage, where the spectrum is sensed to detect and avoid interfering with licensed users. Unfortunately, regardless of the type of the spectrum sensing technique employed,...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    A Self-Evolving Anomaly Detection Framework for Developing Highly Dependable Utility Clouds

    Utility clouds continue to grow in scale and in the complexity of their components and interactions, which introduces a key challenge to failure and resource management for highly dependable cloud computing. Autonomic anomaly detection is a crucial technique for understanding emergent, cloud-wide phenomena and self-managing cloud resources for system-level dependability...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Adaptive Provisioning for Evolving Virtual Network Request in Cloud-based Datacenters

    Cloud based datacenters provide on demand services and resources, both transparently and cost effectively. These services and applications are typically hosted and run on the servers located in interconnected datacenters. The task or application request from users can be called as a Virtual Network (VN) request. How to efficiently accommodate...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Impact of Communication Uncertainties on Workflow Scheduling in Hybrid Clouds

    The so-called hybrid cloud is the composition of an infrastructure that comprises private resources as well as public resources leased from public clouds. Hybrid clouds can be utilized for the execution of applications composed of dependent jobs, usually modeled as workflows. In this scenario, a scheduler must distribute the components...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    On the Integrated Control of Virtual Machine Live Migration and Traffic Engineering for Cloud Computing

    Virtual machine live migration, which migrates a virtual machine between data centers, is studied as a way to improve quality of services hosted on clouds. Meanwhile, traffic engineering is performed in networks that connect geographically dispersed data centers. These two controls are originally designed and operated individually. Though it is...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Double Auction-based Optimal Relay Assignment for Many-to-Many Cooperative Wireless Networks

    Recently, as it can increase the capacity of wireless networks greatly through spatial diversity by taking advantage of antennas on other nodes, Cooperative Communication (CC) has been obtaining more and more attention. However, as the selfish nature, the wireless node may be unwilling to serve as relay node if they...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Resource Contention-Aware Virtual Machine Management for Enterprise Applications

    Consolidating Virtual Machines (VMs) in data centers is desirable as it reduces hardware and power costs. However the performances of VMs on shared physical servers are not isolated from each other as they contend for the same server resources. This contention degrades the performance of delay sensitive applications and can...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2012

    Community Detection in an Integrated Internet of Things and Social Network Architecture

    In this paper, the authors propose a community detection scheme in an integrated Internet of Things (IoT) and Social Network (SN) architecture. The paper takes a graph mining approach to solve the problem in complex network of IoT and SN. A number of pieces of research literature exist on community...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Oct 2009

    Providing Quality of Service Guarantees in Multiclass IEEE 802.16e Sleep Mode

    Authors consider the sleep mode algorithm of IEEE 802.16e mobile networks where a mobile station may switch off the transceiver and go into sleep mode in order to save power. Depending on the underlying application, different algorithms are defined in the standard. In practice, a hybrid combination of the sleep...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jul 2009

    Energy Efficiency of Fixed-Rate Wireless Transmissions Under QoS Constraints

    Transmission over wireless fading channels under Quality of Service (QoS) constraints is studied when only the receiver has perfect channel side information. Being unaware of the channel conditions, transmitter is assumed to send the information at a fixed rate. Under these assumptions, a two-state (ON-OFF) transmission model is adopted, where...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Feb 2010

    Data Security and Privacy in Wireless Body Area Networks

    The wireless body area network has emerged as a new technology for e-healthcare that allows the data of a patient's vital body parameters and movements to be collected by small wearable or implantable sensors and communicated using short-range wireless communication techniques. WBAN has shown great potential in improving healthcare quality,...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Sep 2010

    QoS-Aware Cross-Layer Multicasting for Optical Packet-Switched Networks: Simulation Exploration and Test-Bed Demonstration

    Cross-layer quality-of-service-aware packet multicasting is investigated for optical packet switching network fabrics. This paper presents both a numerical simulation exploration of the cross-layer routing algorithms and an experimental demonstration on an optical switching test-bed with 10?10- GB/s wavelength-striped packets. A novel Internet architecture will be essential to accommodate the exploding...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2010

    Statistical QoS Provisionings for Wireless Unicast/Multicast of Multi-Layer Video Streams

    Due to the time-varying wireless channels, deterministic Quality of Service (QoS) is usually difficult to guarantee for real-time multi-layer video transmissions in wireless networks. Consequently, statistical QoS guarantees have become an important alternative in supporting real-time video transmissions. This paper proposes an efficient framework to model the statistical delay QoS...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Sep 2009

    A Cross-Layer Framework for Multi-Layer-Video Multicast With QoS Requirements in Multirate Wireless Networks

    This paper proposes a cross-layer framework for efficient multi-layer-video multicast with rate adaptation and Quality of-Service (QoS) requirements in multirate wireless networks. The authors employ time division multiple access at the physical layer to transmit different video layers data. The multicast sender then dynamically regulates the transmission rate and time-slot...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Sep 2009

    Next-Generation CDMA Vs. OFDMA for 4G Wireless Applications

    The great success of the Internet and wireless communications has opened a new vista for future all-IP wireless applications, driven by increasing demand for packet data services in worldwide third-Generation (3G) and 3.5G networks. It has been envisioned that the future wireless systems will operate based mainly on burst data...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2009

    Admission Control for QoS Support in Heterogeneous 4G Wireless Networks

    Admission control plays a very important role in wireless systems, as it is one of the basic mechanisms for ensuring the quality of service offered to users. Based on the available network resources, it estimates the impact of adding or dropping a new session request. In both 2G and 3G...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2009

    Multigrade Security Monitoring for Ad-Hoc Wireless Networks

    Ad-hoc wireless networks are being deployed in critical applications that require protection against sophisticated adversaries. However, wireless routing protocols, such as the widely-used AODV, are often designed with the assumption that nodes are benign. Cryptographic extensions such as Secure AODV (SAODV) protect against some attacks but are still vulnerable to...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Nov 2009

    Architecting Storage for the Cloud Computing Era

    The past two decades have seen advances in processor design - from microarchitectural techniques to boost instruction and thread-level parallelism to the shift from single-core to multicore processors. The number of cores on the die will likely continue to grow, thereby providing a tremendous amount of processing power within a...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Oct 2009

    C-Meter: A Framework for Performance Analysis of Computing Clouds

    Cloud computing has emerged as a new technology that provides large amounts of computing and data storage capacity to its users with a promise of increased scalability, high availability, and reduced administration and maintenance costs. As the use of cloud computing environments increases, it becomes crucial to understand the performance...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jul 2009

    An Audio DSP Toolkit for Rapid Application Development in Flash

    The Adobe Flash platform has become the de facto standard for developing and deploying media rich web applications and games. The relative ease-of-development and cross-platform architecture of Flash enables designers to rapidly prototype graphically rich interactive applications, but comprehensive support for audio and signal processing has been lacking. ActionScript, the...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2010

    Soft Error Considerations for Computer Web Servers

    Soft errors are caused by cosmic rays striking sensitive regions in electronic devices. Termed as Single Event Upset (SEU), in the past this phenomenon mostly affected the high altitude systems or avionics. The small geometries of today's nanodevices and their use in high-density and high-complexity designs make electronic systems sensitive...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2010

    Adaptive Routing Strategies in IEEE 802.16 Multi-Hop Wireless Backhaul Networks Based on Evolutionary Game Theory

    The high frequency segment (10-66GHz) of the IEEE 802.16 standard seems promising for the implementation of wireless backhaul networks carrying large volumes of Internet traffic. In contrast to wireline backbone networks, where channel errors seldom occur, routing decisions in IEEE 802.16 networks are conditioned by wireless channel impairments rather than...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2010

    Performance Evaluation of Adaptive Routing Algorithms for Achieving Fault Tolerance in NoC Fabrics

    Commercial designs are integrating from 10 to 100 embedded functional and storage blocks in a single System on Chip (SoC) currently, and the number is likely to increase significantly in the near future. The communication requirements of these large Multi Processor SoCs (MP-SoCs) are convened by the emerging Network-on-a-Chip (NoC)...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Dec 2009

    Analysis of Equal Cost Adaptive Routing Algorithms Using Connection-Oriented and Connectionless Protocols

    ROUTING of data employs routing algorithms. The performance of routing depends on the routing algorithms adopted. The routing algorithms may be single path adaptive or multi-path adaptive. The multi-path adaptive routing algorithm used in this research paper is equal-cost multi-path, because it gives the better performance than single path routing...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jan 2010

    Joint Multicast Routing and Channel Assignment in Multiradio Multichannel Wireless Mesh Networks Using Tabu Search

    This paper proposes a Tabu Search (TS) based optimization approach to search a minimum-interference multicast tree which satisfies the end-to-end delay constraint and optimizes the usage of the scarce radio network resource in wireless mesh networks. The path-oriented encoding method is adopted and each candidate solution is represented by a...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2010

    Reliable Adaptive Multipath Provisioning With Bandwidth and Differential Delay Constraints

    Robustness and reliability are critical issues in network management. To provide resiliency, a popular protection scheme against network failures is the simultaneous routing along multiple disjoint paths. Most previous protection and restoration schemes were designed for all-or-nothing protection and thus, overkill for data traffic. This paper, explore the Reliable Adaptive...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Sep 2009

    Efficient Uplink Bandwidth Request With Delay Regulation for Real-Time Service in Mobile WiMAX Networks

    The emerging broadband wireless access technology based on IEEE 802.16 is one of the most promising solutions to provide ubiquitous wireless access to the broadband service at low cost. This paper proposes an efficient uplink bandwidth request allocation algorithm for real-time services in Mobile WiMAX networks based on IEEE 802.16e....

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jul 2009

    A 12-Bit 3.125 MHz Bandwidth 0-3 MASH Delta-Sigma Modulator

    This paper demonstrates a 12-bit 0 - 3MASHdelta-sigma modulator with a 3.125 MHz bandwidth in a 0.18 m CMOS technology. The modulator has an oversampling ratio of 8 clock frequency of 50 MHz and achieves a peak SNDR of 73.9 dB (77.2 dB Peak SNR) and consumes 24mWfrom a 1.8...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Aug 2009

    Error Control in Wireless Sensor Networks: A Cross Layer Analysis

    Error control is of significant importance for Wireless Sensor Networks (WSNs) because of their severe energy constraints and the low power communication requirements. In this paper, a cross-layer methodology for the analysis of error control schemes in WSNs is presented such that the effects of multi-hop routing and the broadcast...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2010

    Adaptive Channel Hopping for Interference Robust Wireless Sensor Networks

    In this work, an Adaptive Channel Hopping (ACH) mechanism for sensor networks is proposed to avoid interference from other sources and narrow-band jamming. Under unfavorable channel conditions, ACH lets sensors switch to a new operating channel. ACH reduces the channel scanning and selection latency by ordering available channels using link...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2010

    Computational Intelligence in Wireless Sensor Networks: A Survey

    Wireless Sensor Networks (WSNs) are networks of distributed autonomous devices that can sense or monitor physical or environmental conditions cooperatively. WSNs face many challenges, mainly caused by communication failures, storage and computational constraints and limited power supply. Paradigms of Computational Intelligence (CI) have been successfully used in recent years to...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2010

    Directed Coverage in Wireless Sensor Networks: Concept and Quality

    In this paper, the authors introduce a new type of coverage for wireless sensor networks, called Directed Coverage (DCoverage). Basically, D-Coverage is the coverage provided by a sensor network monitoring an area between two boundaries, through which the intruder attempts to penetrates the area. The authors also study how to...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2009

    A Hierarchical Routing Protocol for Survivability in Wireless Sensor Network (WSN)

    Wireless Sensor Network (WSN) is one of the major research areas in computer network field today. The function of WSN in this paper is to provide sensing services in an un-attended harsh environment. Sensed data need to be delivered to the sink and to cope with the network unreliability problem....

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Oct 2010

    Workshop - Google App Inventor for Android: Creating Mobile Applications as a First Computing Experience

    App Inventor for Android is a visual programming environment being created by Google that enables non-programmers to easily build mobile phone applications. It will become publicly available starting in 2010. A prototype implementation was piloted in introductory computer science courses at 12 colleges and universities in fall 2009. App Inventor...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Sep 2010

    Misbehaving Router Detection in Link-state Routing for Wireless Mesh Networks

    In this paper, the authors address the problem of detecting misbehaving routers in wireless mesh networks and avoiding them when selecting routes. The authors assume that link-state routing is used, and they essentially propose a reputation system, where trusted gateway nodes compute Node Trust Values for the routers, which are...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jul 2009

    Securing Wireless Communication With Implanted Medical Devices Using Reciprocal Carrier-Phase Quantization

    Securing wireless communication with resource constrained implanted medical devices is considered. A method for refreshing symmetric encryption keys by reciprocal quantization of the phase between local oscillators is proposed and analyzed. The method relies on simple low cost implementation and demands virtually no computation power or memory. These properties make...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jul 2009

    Green Communications: A New Paradigm for Creating Cost Effective Wireless Systems

    Telecommunications usage has skyrocketed in recent years and will continue to grow as developing nations reach to wireless as their communications medium of choice. The telecommunications world is only now addressing the significant environmental impact that telecommunications is creating as well as the incredible cost incurred based on energy usage....

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // May 2010

    Packaging of Dual-Mode Wireless Communication Module Using RF/Optoelectronic Devices With Shared Functional Components

    This paper reports the design, fabrication, and testing of a compact Radio-Frequency (RF)/ Free Space Optical (FSO) dual mode wireless communication system. A modified split dual-director quasi-Yagi antenna is integrated with optical transmitter and receiver by sharing layout structural components. Bare die Vertical-Cavity Surface-Emitting Laser (VCSEL) and P-i-N photodiode (PIN)...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Dec 2009

    Multi-Transceiver Optical Wireless Spherical Structures for MANETs

    Due to its high bandwidth spectrum, Free-Space-Optical (FSO) communication has the potential to bridge the capacity gap between backbone fiber links and mobile ad-hoc links, especially in the last-mile. Though FSO can solve the wireless capacity problem, it brings new challenges such as frequent disruption of wireless communication links (Intermittent...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Mar 2009

    Wireless Sensor Nodes Processor Architecture and Design

    The sensor networks are intended to support a variety of applications. Providing sensor network with flexible nodes design will make possible to support a variety of applications. A detailed view of soft processor core design and the instructions set for flexible sensor network nodes is presented in this paper. This...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2009

    Is Light-Tree Structure Optimal for Multicast Routing in Sparse Light Splitting WDM Networks?

    To minimize the number of wavelengths required by a multicast session in sparse light splitting Wavelength Division Multiplexing (WDM) networks, a light-hierarchy structure, which occupies the same wavelength on all links, is proposed to span as many destinations as possible. Different from a lighttree, a light-hierarchy accepts cycles, which are...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jun 2009

    QOS Multicast Routing Based on Bandwidth and Resource Availability in Mobile Adhoc Networks

    The need for supporting real time and multimedia applications for users of Mobile Ad hoc Network (MANET) is becoming essential. Mobile ad hoc networks can provide multimedia users with mobility they demand, if efficient QoS multicast strategies were developed. The aim of this paper is to define the building blocks...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2009

    Extension and Comparison of QoS-Enabled Wi-Fi Models in the Presence of Errors

    This paper compares and enhances the three prevailing approaches of IEEE 802.11e Performance analysis. Specifically, the first model utilizes a Markov Chain to describe the state of the Backoff Counter, the second is based on a general probabilistic explanation of the standard and the third forms a queuing network. The...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Sep 2009

    An Empirical Analysis of Wi-Fi Activity in Three Urban Scenarios

    A better understanding of people's daily behaviors with respect to the underlying wireless network is a crucial step toward Wi-Fi based pervasive networking. Existing analyses found in the literature have focused on closed environments such as university campuses, offices, or conferences. This paper develops a new approach to analyze Wi-Fi...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jul 2009

    Supporting Database Applications as a Service

    Multi-tenant data management is a form of Software as a Service (SaaS), whereby a third party service provider hosts databases as a service and provides its customers with seamless mechanisms to create, store and access their databases at the host site. One of the main problems in such a system,...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Jul 2009

    Minimum-Power Multicast Routing in Static Ad Hoc Wireless Networks

    THE RECENT advances in the development of affordable and portable wireless communication and computation devices has fostered a tremendous amount of research on ad hoc wireless networks. Ad hoc networks can be used wherever a fixed backbone infrastructure is not viable, e.g., in battlefield and emergency disaster relief. Typically, omnidirectional...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2010

    QoS Enhancement and Performance Evaluation of Ad-Hoc Routing Protocols for Rural Public Safety

    In this paper, authors explore the feasibility of using Mobile Ad-hoc Networks (MANETs) for rural public safety. First, authors discuss a QoS enhancement to a standard routing protocol, Dynamic Source Routing (DSR). By incorporating a new routing metric and the available bandwidth and delay estimation algorithms with DSR, authors design...

    Provided By Institute of Electrical and Electronics Engineers

  • White Papers // Apr 2009

    Godson-3: A Scalable Multicore Risc Processor With X86 Emulation

    Godson-3s scalable and distributed on chip network connects processor cores and globally addressed level-two (L2) cache modules. A directory-based cache-coherence protocol maintains multiple level-one (L1) copies of the same L2 block. Godson-3's MIPS64-compatible superscalar reduced instruction-set-computing (RISC) processor core is designed for high performance and low power dissipation. It also...

    Provided By Institute of Electrical and Electronics Engineers