University of Alaska, Fairbanks

Displaying 1-40 of 40 results

  • White Papers // Jan 2014

    Density-Based Clustering Validation

    One of the most challenging aspects of clustering is validation, which is the objective and quantitative assessment of clustering results. A number of different relative validity criteria have been proposed for the validation of globular, clusters. Not all data, however, are composed of globular clusters. Density-based clustering algorithms seek partitions...

    Provided By University of Alaska, Fairbanks

  • White Papers // Jan 2014

    Generalized Outlier Detection With Flexible Kernel Density Estimates

    The authors analyze the interplay of density estimation and outlier detection in density-based outlier detection. By clear and principled decoupling of both steps, they formulate a generalization of density-based outlier detection methods based on kernel density estimation. Embedded in a broader framework for outlier detection, the resulting method can be...

    Provided By University of Alaska, Fairbanks

  • White Papers // Jun 2013

    A Fault Tolerant NoC Architecture Using Quad-Spare Mesh Topology and Dynamic Reconfiguration

    Network-on-Chip (NoC) is widely used as a communication scheme in modern many-core systems. To guarantee the reliability of communication, effective fault tolerant techniques are critical for a NoC. In this paper, a novel fault tolerant architecture employing redundant routers is proposed to maintain the functionality of a network in the...

    Provided By University of Alaska, Fairbanks

  • White Papers // Jun 2013

    Gearing Resource-Poor Mobile Devices with Powerful Clouds: Architectures, Challenges, and Applications

    Mobile cloud computing, with its promise to meet the urgent need for richer applications and services of resource-constrained mobile devices, is emerging as a new computing paradigm and has recently attracted significant attention. However, there is no clear definition and no well defined scope for mobile cloud computing due to...

    Provided By University of Alaska, Fairbanks

  • White Papers // Mar 2013

    Hybrid DEEC: Towards Efficient Energy Utilization in Wireless Sensor Networks

    The clustering algorithm is considered as a kind of key technique used to reduce energy consumption. It can help in increasing the stability period and network life time. Routing protocol for efficient energy utilization should be designed for heterogeneous Wireless Sensor Networks (WSNs). The authors purpose Hybrid-DEEC (H-DEEC), a chain...

    Provided By University of Alaska, Fairbanks

  • White Papers // Mar 2013

    EAPESS: An Adaptive Transmission Scheme in Wireless Sensor Networks

    Reduced energy consumption in sensor nodes is one of the major challenges in Wireless Sensor Networks (WSNs) deployment. In this regard, Error Control Coding (ECC) is one of techniques used for energy optimization in WSNs. Similarly, critical distance is another term being used for energy efficiency, when used with ECC...

    Provided By University of Alaska, Fairbanks

  • White Papers // Jan 2013

    An Efficient Distributed Algorithm for Resource Allocation in Large-Scale Coupled Systems

    In modern large-scale systems, fast distributed resource allocation and utility maximization are becoming increasingly important. Traditional solutions to such problems rely on primal/dual decomposition and gradient methods, whose convergence is sensitive to the choice of the stepsize and may not be sufficient to satisfy the requirement of large-scale real-time applications....

    Provided By University of Alaska, Fairbanks

  • White Papers // Jan 2013

    A Comparison Between LDPC Block and Convolutional Codes

    LDPC convolutional codes have been shown to be capable of achieving the same capacity-approaching performance as LDPC block codes with iterative message-passing decoding. However, traditional means of comparing block and convolutional codes tied to the implementation complexity of trellis based decoding are irrelevant for message-passing decoders. In this paper, the...

    Provided By University of Alaska, Fairbanks

  • White Papers // Nov 2012

    Power Allocation/Beamforming for DF MIMO Two-Way Relaying: Relay and Network Optimization

    The problem of sum-rate maximization with minimum power consumption is studied for a Decode-and-Forward (DF) Multiple-Input Multiple-Output (MIMO) two-way relaying system consisting of two sources and one relay. Two scenarios are investigated. In the first scenario, the relay optimizes its own power allocation/beamforming strategy given that the strategies of the...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Simulation Analysis of IEEE 802.15.4 Non-Beacon Mode at Varying Data Rates

    IEEE 802.15.4 standard is designed for low power and low data rate applications with high reliability. It operates in beacon enable and non-beacon enable modes. In this paper, the authors analyze delay, throughput, load, and end-to-end delay of non-beacon enable mode. Analysis of these parameters are performed at varying data...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    On Performance Evaluation of Variants of DEEC in WSNs

    Wireless Sensor Networks (WSNs) contain numerous sensor nodes having limited power resource, which report sensed data to the Base Station (BS) that requires high energy usage. Many routing protocols have been proposed in this regard achieving energy efficiency in heterogeneous scenarios. However, every protocol is not suitable for heterogeneous WSNs....

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Routing Load of Route Discovery and Route Maintenance in Wireless Reactive Routing Protocols

    In this paper, the authors present analytical study of routing overhead of reactive routing protocols for Wireless Multihop Networks (WMhNs). To accomplish the framework of generalized routing overhead, they choose Ad-Hoc on Demand Distance Vector (AODV), Dynamic Source Routing (DSR) and DYnamic MANET On Demand (DYMO). Considering basic themes of...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Simulation Analysis of Medium Access Techniques

    This paper presents comparison of Access Techniques used in Medium Access Control (MAC) protocol for Wireless Body Area Networks (WBANs). Comparison is performed between Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA), Pure ALOHA and Slotted ALOHA (S-ALOHA). Performance metrics...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Performance Analysis of Hierarchical Routing Protocols in Wireless Sensor Networks

    This paper focuses on analyzing the optimization strategies of routing protocols with respect to energy utilization of sensor nodes in Wireless Sensor Network (WSNs). Different routing mechanisms have been proposed to address energy optimization problem in sensor nodes. Clustering mechanism is one of the popular WSNs routing mechanisms. In this...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Optimal Number of Cluster Head Selection for Efficient Distribution of Sources in WSNs

    In this paper, the authors compare problems of cluster formation and cluster-head selection between different protocols for data aggregation and transmission. They focus on two aspects of the problem: how to guess number of clusters required to proficiently consume available sources for a sensor network, and how to select number...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Transmission Delay of Multi-Hop Heterogeneous Networks for Medical Applications

    Now-a-days, with increase in ageing population, Health care market keeps growing. There is a need for monitoring of Health issues. Body Area Network consists of wireless sensors attached on or inside human body for monitoring vital Health related problems e.g., Electro Cardiogram (ECG), ElectroEncephaloGram (EEG), ElectronyStagmoGraphy(ENG) etc. Data is recorded...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Analyzing Energy-Efficiency and Route-Selection of Multi-Level Hierarchal Routing Protocols in WSNs

    The advent and development in the field of Wireless Sensor Networks (WSNs) in recent years has seen the growth of extremely small and low-cost sensors that possess sensing, signal processing and wireless communication capabilities. These sensors can be expended at a much lower cost and are capable of detecting conditions...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Modeling Propagation Characteristics for Arm-Motion in Wireless Body Area Sensor Networks

    To monitor health information using wireless sensors on body is a promising new application. Human body acts as a transmission channel in wearable wireless devices, so electromagnetic propagation modeling is well thought-out for transmission channel in Wireless Body Area Sensor Network (WBASN). In this paper, the authors have presented the...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Routing Load of Route Calculation and Route Maintenance in Wireless Proactive Routing Protocols

    This paper presents mathematical framework and study of proactive routing Protocols. The performance analysis of three major proactive routing protocols: Destination-Sequenced Distance Vector (DSDV), Fish-eye State Routing (FSR) and Optimized Link State Routing (OLSR) are under consideration in this work. Taking these routing protocols into account, the authors enhance existing...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    HSEP: Heterogeneity-Aware Hierarchical Stable Election Protocol for WSNs

    Wireless Sensor Networks (WSNs) are increasing to handle complex situations and functions. In these networks some of the nodes become Cluster Heads (CHs) which are responsible to aggregate data of from cluster members and transmit it to Base Stations (BS). Those clustering techniques which are designed for homogenous network are...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Monitoring and Controlling Power Using Zigbee Communications

    Smart grid is a modified form of electrical grid where generation, transmission, distribution and customers are not only connected electrically but also through strong communication network with each other as well as with market, operation and service provider. For achieving good communication link among them, it is very necessary to...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    A Comprehensive Survey of MAC Protocols for Wireless Body Area Networks

    In this paper, the authors present a comprehensive study of Medium Access Control (MAC) protocols developed for Wireless Body Area Networks (WBANs). In WBANs, small battery-operated on-body or implanted biomedical sensor nodes are used to monitor physiological signs such as temperature, blood pressure, ElectroCardioGram (ECG), ElectroEncephaloGraphy (EEG) etc. They discuss...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Analytical Survey of Wearable Sensors

    Wearable sensors in Wireless Body Area Networks (WBANs) provide health and physical activity monitoring. Modern communication systems have extended this monitoring remotely. In this paper, various types of wearable sensors discussed, their medical applications like ECG, EEG, blood pressure, detection of blood glucose level, pulse rate, respiration rate and non...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    A MAC Protocol for Multihop RP-CDMA Ad Hoc Wireless Networks

    RP-CDMA is a wireless multiple access protocol that utilizes multiple spreading codes and a multiple packet receiver to enhance link reliability and performance. The authors apply RP-CDMA to a multi-hop wireless ad hoc network and propose two significant extensions aimed at improving throughput and reliability. Their simulations confirm that RP-CDMA...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    Power-Efficient Robust Routing and Resource Allocation in Wireless Mesh Networks

    In this paper, a new robust routing formulation in a Wireless Mesh Network (WMN) is proposed, which enables the routing strategy to be robust to random traffic fluctuation. Together with resource allocation in link layer, an optimization problem aiming at minimizing the total transmission power in the WMN is formulated...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    Power Bargaining in Multi-Source Relay Networks

    In this paper, the authors consider a multi-source single-relay wireless network, where the relay facilitates transmissions of the sources' signals to the destination. They study the relay power allocation among the sources, and use the bargaining theory to model the negotiation among the sources on fair allocation of the relay...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    Greedy and Progressive User Scheduling for CoMP Wireless Networks

    In this paper, the authors propose Progressive User Scheduling (PUS) and distributed Successive Zero-Forcing (SZF) precoding for clustered Coordinated Multi-Point transmission/reception (CoMP) systems. With Joint Transmission (JT) across a cluster of cells, centralized processing of precoding and user scheduling requires significant bandwidth resources for information exchange among coordinated Base Stations...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    Joint Beamforming and Antenna Selection for Two-Way Amplify-and-Forward MIMO Relay Networks

    A novel joint beamforming and antenna selection strategy is proposed and analyzed for two-way multiple-input multiple-output amplify-and-forward relay networks. Specifically, this strategy selects the optimal transmit precoding and receiver filtering vectors at the two source terminals, and an optimal transmit/receive antenna at the relay terminal based on minimizing the overall...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    On MMSE Vector-Perturbation Precoding for MIMO Broadcast Channels With Per-Antenna-Group Power Constraints

    Recently, studies on sub-optimal precoding techniques for Multiple-Input Multiple-Output Broadcast Channels (MIMO-BC), which achieve performance near to that of the Dirty Paper Coding (DPC), have drawn attention to Vector Perturbation (VP). In practice, each antenna or more generally each antenna group has its own limit on the transmitted power, which...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    Uniform Approximations for Wireless Performance in Fading, Noise and Interference

    The authors derive simple Uniform Approximations (UAs) for the Bit Error Rate (BER), the Symbol Error Rate (SER), and the outage of wireless digital communication systems impaired by fading, noise, and interference. The striking feature of the UAs is their accuracy over the whole range of Signal-to-Noise Ratio (SNR) values,...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    Calculating the Distribution of Sums of Log-Gamma Random Variables

    The problem of determining the distribution of sums of (weighted) log-gamma random variables occurs in spectrum sensing for cognitive radio. An infinite series is derived for the characteristic function of log-gamma random variables. Some special cases are identified for which the infinite series can be represented in terms of some...

    Provided By University of Alaska, Fairbanks

  • White Papers // Oct 2011

    Analysis of Controlled Probabilistic Access with Multipacket Reception

    Multi-Packet Reception (MPR) capability provides the opportunity to improve bandwidth utilization while reducing complexity of the Medium Access Control layer. Specifically, it has been shown that ALOHA random access tends to become asymptotically optimal as the receiver's joint decoding capability of the receiver grows to infinity. However, the average traffic...

    Provided By University of Alaska, Fairbanks

  • White Papers // Jun 2011

    Enviro-Net: From Networks of Ground-Based Sensor Systems to a Web Platform for Sensor Data Management

    Ecosystems monitoring is essential to properly understand their development and the effects of events, both climatological and anthropological in nature. The amount of data used in these assessments is increasing at very high rates. This is due to increasing availability of sensing systems and the development of new techniques to...

    Provided By University of Alaska, Fairbanks

  • White Papers // Feb 2010

    An Optimal Algorithm for Wideband Spectrum Sensing in Cognitive Radio Systems

    An optimal wideband spectrum sensing algorithm which jointly detects the primary activities over multiple narrowband channels is presented. The algorithm enhances the overall secondary user performance while protecting the primary network at a desired level. The problem is formulated as an optimization problem to maximize the available secondary throughput capacity...

    Provided By University of Alaska, Fairbanks

  • White Papers // Oct 2009

    Dynamic Power Allocation over Block-Fading Channels with Delay Constraint

    The problem of allocating power over a non-ergodic Gaussian block fading channel is addressed for delay constrained applications, where transmission takes place over a limited number of time slots. The authors propose an algorithm in which the transmission power is determined at each time slot based on the channel condition...

    Provided By University of Alaska, Fairbanks

  • White Papers // Oct 2009

    Packet Transmission Scheduling Algorithm for Dense Wireless Sensor Networks with Mobile Sink

    A transmission scheduling algorithm is proposed for Wireless Sensor Networks with high node densities, where a mobile sink is responsible for collecting the information from the sensor nodes with similar observations as well as determining the best transmission strategy. The proposed optimal algorithm and the reduced complexity algorithm are based...

    Provided By University of Alaska, Fairbanks

  • White Papers // Oct 2009

    An Efficient Key Management Scheme for Live Streaming

    To protect multimedia content in live streaming applications, it is of critical importance to employ effective access control and key management schemes and to prevent unauthorized access. Many live streaming applications experience a large variation in the user number, high reconnection rate, and a large number of short sessions. Such...

    Provided By University of Alaska, Fairbanks

  • White Papers // Oct 2009

    Incremental Routing and Scheduling in Wireless Grids

    In this paper, the authors deal with two fundamental joint routing and scheduling problems in multi-hop Wireless Mesh Networks (WMNs) employing Time Division Multiple Access (TDMA). The problems pertain to incremental update of schedules as some of the existing flows terminate and new flow demands are received. In the first...

    Provided By University of Alaska, Fairbanks

  • White Papers // Mar 2007

    A User-Centered Approach to Modeling BPEL Business Processes Using SUCD Use Cases

    BPEL is being widely used to specify business processes through the orchestration, com-position and coordination of web services. It is now common practice to begin the process of modeling the work flows within a set of BPEL business processes using UML Activity Diagrams since they can be automatically mapped down...

    Provided By University of Alaska, Fairbanks

  • White Papers // Jun 2006

    Introduction to the Special Issue on Successful Real-World Data Mining Applications

    Since its inception, the field of data mining and knowledge discovery from databases has been driven by the need to solve practical problems. From scaling to large databases and handling noisy and high-dimensional data to finding associational patterns in grocery store transaction data, data mining is a research area rich...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    Uniform Approximations for Wireless Performance in Fading, Noise and Interference

    The authors derive simple Uniform Approximations (UAs) for the Bit Error Rate (BER), the Symbol Error Rate (SER), and the outage of wireless digital communication systems impaired by fading, noise, and interference. The striking feature of the UAs is their accuracy over the whole range of Signal-to-Noise Ratio (SNR) values,...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    Calculating the Distribution of Sums of Log-Gamma Random Variables

    The problem of determining the distribution of sums of (weighted) log-gamma random variables occurs in spectrum sensing for cognitive radio. An infinite series is derived for the characteristic function of log-gamma random variables. Some special cases are identified for which the infinite series can be represented in terms of some...

    Provided By University of Alaska, Fairbanks

  • White Papers // Oct 2009

    Dynamic Power Allocation over Block-Fading Channels with Delay Constraint

    The problem of allocating power over a non-ergodic Gaussian block fading channel is addressed for delay constrained applications, where transmission takes place over a limited number of time slots. The authors propose an algorithm in which the transmission power is determined at each time slot based on the channel condition...

    Provided By University of Alaska, Fairbanks

  • White Papers // Oct 2009

    Packet Transmission Scheduling Algorithm for Dense Wireless Sensor Networks with Mobile Sink

    A transmission scheduling algorithm is proposed for Wireless Sensor Networks with high node densities, where a mobile sink is responsible for collecting the information from the sensor nodes with similar observations as well as determining the best transmission strategy. The proposed optimal algorithm and the reduced complexity algorithm are based...

    Provided By University of Alaska, Fairbanks

  • White Papers // Oct 2009

    An Efficient Key Management Scheme for Live Streaming

    To protect multimedia content in live streaming applications, it is of critical importance to employ effective access control and key management schemes and to prevent unauthorized access. Many live streaming applications experience a large variation in the user number, high reconnection rate, and a large number of short sessions. Such...

    Provided By University of Alaska, Fairbanks

  • White Papers // Oct 2009

    Incremental Routing and Scheduling in Wireless Grids

    In this paper, the authors deal with two fundamental joint routing and scheduling problems in multi-hop Wireless Mesh Networks (WMNs) employing Time Division Multiple Access (TDMA). The problems pertain to incremental update of schedules as some of the existing flows terminate and new flow demands are received. In the first...

    Provided By University of Alaska, Fairbanks

  • White Papers // Oct 2011

    Analysis of Controlled Probabilistic Access with Multipacket Reception

    Multi-Packet Reception (MPR) capability provides the opportunity to improve bandwidth utilization while reducing complexity of the Medium Access Control layer. Specifically, it has been shown that ALOHA random access tends to become asymptotically optimal as the receiver's joint decoding capability of the receiver grows to infinity. However, the average traffic...

    Provided By University of Alaska, Fairbanks

  • White Papers // Jan 2013

    A Comparison Between LDPC Block and Convolutional Codes

    LDPC convolutional codes have been shown to be capable of achieving the same capacity-approaching performance as LDPC block codes with iterative message-passing decoding. However, traditional means of comparing block and convolutional codes tied to the implementation complexity of trellis based decoding are irrelevant for message-passing decoders. In this paper, the...

    Provided By University of Alaska, Fairbanks

  • White Papers // Feb 2010

    An Optimal Algorithm for Wideband Spectrum Sensing in Cognitive Radio Systems

    An optimal wideband spectrum sensing algorithm which jointly detects the primary activities over multiple narrowband channels is presented. The algorithm enhances the overall secondary user performance while protecting the primary network at a desired level. The problem is formulated as an optimization problem to maximize the available secondary throughput capacity...

    Provided By University of Alaska, Fairbanks

  • White Papers // Jun 2013

    Gearing Resource-Poor Mobile Devices with Powerful Clouds: Architectures, Challenges, and Applications

    Mobile cloud computing, with its promise to meet the urgent need for richer applications and services of resource-constrained mobile devices, is emerging as a new computing paradigm and has recently attracted significant attention. However, there is no clear definition and no well defined scope for mobile cloud computing due to...

    Provided By University of Alaska, Fairbanks

  • White Papers // Mar 2007

    A User-Centered Approach to Modeling BPEL Business Processes Using SUCD Use Cases

    BPEL is being widely used to specify business processes through the orchestration, com-position and coordination of web services. It is now common practice to begin the process of modeling the work flows within a set of BPEL business processes using UML Activity Diagrams since they can be automatically mapped down...

    Provided By University of Alaska, Fairbanks

  • White Papers // Jun 2011

    Enviro-Net: From Networks of Ground-Based Sensor Systems to a Web Platform for Sensor Data Management

    Ecosystems monitoring is essential to properly understand their development and the effects of events, both climatological and anthropological in nature. The amount of data used in these assessments is increasing at very high rates. This is due to increasing availability of sensing systems and the development of new techniques to...

    Provided By University of Alaska, Fairbanks

  • White Papers // Jun 2006

    Introduction to the Special Issue on Successful Real-World Data Mining Applications

    Since its inception, the field of data mining and knowledge discovery from databases has been driven by the need to solve practical problems. From scaling to large databases and handling noisy and high-dimensional data to finding associational patterns in grocery store transaction data, data mining is a research area rich...

    Provided By University of Alaska, Fairbanks

  • White Papers // Jan 2014

    Generalized Outlier Detection With Flexible Kernel Density Estimates

    The authors analyze the interplay of density estimation and outlier detection in density-based outlier detection. By clear and principled decoupling of both steps, they formulate a generalization of density-based outlier detection methods based on kernel density estimation. Embedded in a broader framework for outlier detection, the resulting method can be...

    Provided By University of Alaska, Fairbanks

  • White Papers // Jan 2014

    Density-Based Clustering Validation

    One of the most challenging aspects of clustering is validation, which is the objective and quantitative assessment of clustering results. A number of different relative validity criteria have been proposed for the validation of globular, clusters. Not all data, however, are composed of globular clusters. Density-based clustering algorithms seek partitions...

    Provided By University of Alaska, Fairbanks

  • White Papers // Jun 2013

    A Fault Tolerant NoC Architecture Using Quad-Spare Mesh Topology and Dynamic Reconfiguration

    Network-on-Chip (NoC) is widely used as a communication scheme in modern many-core systems. To guarantee the reliability of communication, effective fault tolerant techniques are critical for a NoC. In this paper, a novel fault tolerant architecture employing redundant routers is proposed to maintain the functionality of a network in the...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    A MAC Protocol for Multihop RP-CDMA Ad Hoc Wireless Networks

    RP-CDMA is a wireless multiple access protocol that utilizes multiple spreading codes and a multiple packet receiver to enhance link reliability and performance. The authors apply RP-CDMA to a multi-hop wireless ad hoc network and propose two significant extensions aimed at improving throughput and reliability. Their simulations confirm that RP-CDMA...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    Power-Efficient Robust Routing and Resource Allocation in Wireless Mesh Networks

    In this paper, a new robust routing formulation in a Wireless Mesh Network (WMN) is proposed, which enables the routing strategy to be robust to random traffic fluctuation. Together with resource allocation in link layer, an optimization problem aiming at minimizing the total transmission power in the WMN is formulated...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    Power Bargaining in Multi-Source Relay Networks

    In this paper, the authors consider a multi-source single-relay wireless network, where the relay facilitates transmissions of the sources' signals to the destination. They study the relay power allocation among the sources, and use the bargaining theory to model the negotiation among the sources on fair allocation of the relay...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    Greedy and Progressive User Scheduling for CoMP Wireless Networks

    In this paper, the authors propose Progressive User Scheduling (PUS) and distributed Successive Zero-Forcing (SZF) precoding for clustered Coordinated Multi-Point transmission/reception (CoMP) systems. With Joint Transmission (JT) across a cluster of cells, centralized processing of precoding and user scheduling requires significant bandwidth resources for information exchange among coordinated Base Stations...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    Joint Beamforming and Antenna Selection for Two-Way Amplify-and-Forward MIMO Relay Networks

    A novel joint beamforming and antenna selection strategy is proposed and analyzed for two-way multiple-input multiple-output amplify-and-forward relay networks. Specifically, this strategy selects the optimal transmit precoding and receiver filtering vectors at the two source terminals, and an optimal transmit/receive antenna at the relay terminal based on minimizing the overall...

    Provided By University of Alaska, Fairbanks

  • White Papers // May 2012

    On MMSE Vector-Perturbation Precoding for MIMO Broadcast Channels With Per-Antenna-Group Power Constraints

    Recently, studies on sub-optimal precoding techniques for Multiple-Input Multiple-Output Broadcast Channels (MIMO-BC), which achieve performance near to that of the Dirty Paper Coding (DPC), have drawn attention to Vector Perturbation (VP). In practice, each antenna or more generally each antenna group has its own limit on the transmitted power, which...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Routing Load of Route Discovery and Route Maintenance in Wireless Reactive Routing Protocols

    In this paper, the authors present analytical study of routing overhead of reactive routing protocols for Wireless Multihop Networks (WMhNs). To accomplish the framework of generalized routing overhead, they choose Ad-Hoc on Demand Distance Vector (AODV), Dynamic Source Routing (DSR) and DYnamic MANET On Demand (DYMO). Considering basic themes of...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Simulation Analysis of Medium Access Techniques

    This paper presents comparison of Access Techniques used in Medium Access Control (MAC) protocol for Wireless Body Area Networks (WBANs). Comparison is performed between Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA), Pure ALOHA and Slotted ALOHA (S-ALOHA). Performance metrics...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Performance Analysis of Hierarchical Routing Protocols in Wireless Sensor Networks

    This paper focuses on analyzing the optimization strategies of routing protocols with respect to energy utilization of sensor nodes in Wireless Sensor Network (WSNs). Different routing mechanisms have been proposed to address energy optimization problem in sensor nodes. Clustering mechanism is one of the popular WSNs routing mechanisms. In this...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Optimal Number of Cluster Head Selection for Efficient Distribution of Sources in WSNs

    In this paper, the authors compare problems of cluster formation and cluster-head selection between different protocols for data aggregation and transmission. They focus on two aspects of the problem: how to guess number of clusters required to proficiently consume available sources for a sensor network, and how to select number...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Transmission Delay of Multi-Hop Heterogeneous Networks for Medical Applications

    Now-a-days, with increase in ageing population, Health care market keeps growing. There is a need for monitoring of Health issues. Body Area Network consists of wireless sensors attached on or inside human body for monitoring vital Health related problems e.g., Electro Cardiogram (ECG), ElectroEncephaloGram (EEG), ElectronyStagmoGraphy(ENG) etc. Data is recorded...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Analyzing Energy-Efficiency and Route-Selection of Multi-Level Hierarchal Routing Protocols in WSNs

    The advent and development in the field of Wireless Sensor Networks (WSNs) in recent years has seen the growth of extremely small and low-cost sensors that possess sensing, signal processing and wireless communication capabilities. These sensors can be expended at a much lower cost and are capable of detecting conditions...

    Provided By University of Alaska, Fairbanks

  • White Papers // Nov 2012

    Power Allocation/Beamforming for DF MIMO Two-Way Relaying: Relay and Network Optimization

    The problem of sum-rate maximization with minimum power consumption is studied for a Decode-and-Forward (DF) Multiple-Input Multiple-Output (MIMO) two-way relaying system consisting of two sources and one relay. Two scenarios are investigated. In the first scenario, the relay optimizes its own power allocation/beamforming strategy given that the strategies of the...

    Provided By University of Alaska, Fairbanks

  • White Papers // Jan 2013

    An Efficient Distributed Algorithm for Resource Allocation in Large-Scale Coupled Systems

    In modern large-scale systems, fast distributed resource allocation and utility maximization are becoming increasingly important. Traditional solutions to such problems rely on primal/dual decomposition and gradient methods, whose convergence is sensitive to the choice of the stepsize and may not be sufficient to satisfy the requirement of large-scale real-time applications....

    Provided By University of Alaska, Fairbanks

  • White Papers // Mar 2013

    Hybrid DEEC: Towards Efficient Energy Utilization in Wireless Sensor Networks

    The clustering algorithm is considered as a kind of key technique used to reduce energy consumption. It can help in increasing the stability period and network life time. Routing protocol for efficient energy utilization should be designed for heterogeneous Wireless Sensor Networks (WSNs). The authors purpose Hybrid-DEEC (H-DEEC), a chain...

    Provided By University of Alaska, Fairbanks

  • White Papers // Mar 2013

    EAPESS: An Adaptive Transmission Scheme in Wireless Sensor Networks

    Reduced energy consumption in sensor nodes is one of the major challenges in Wireless Sensor Networks (WSNs) deployment. In this regard, Error Control Coding (ECC) is one of techniques used for energy optimization in WSNs. Similarly, critical distance is another term being used for energy efficiency, when used with ECC...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Simulation Analysis of IEEE 802.15.4 Non-Beacon Mode at Varying Data Rates

    IEEE 802.15.4 standard is designed for low power and low data rate applications with high reliability. It operates in beacon enable and non-beacon enable modes. In this paper, the authors analyze delay, throughput, load, and end-to-end delay of non-beacon enable mode. Analysis of these parameters are performed at varying data...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Modeling Propagation Characteristics for Arm-Motion in Wireless Body Area Sensor Networks

    To monitor health information using wireless sensors on body is a promising new application. Human body acts as a transmission channel in wearable wireless devices, so electromagnetic propagation modeling is well thought-out for transmission channel in Wireless Body Area Sensor Network (WBASN). In this paper, the authors have presented the...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Routing Load of Route Calculation and Route Maintenance in Wireless Proactive Routing Protocols

    This paper presents mathematical framework and study of proactive routing Protocols. The performance analysis of three major proactive routing protocols: Destination-Sequenced Distance Vector (DSDV), Fish-eye State Routing (FSR) and Optimized Link State Routing (OLSR) are under consideration in this work. Taking these routing protocols into account, the authors enhance existing...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    On Performance Evaluation of Variants of DEEC in WSNs

    Wireless Sensor Networks (WSNs) contain numerous sensor nodes having limited power resource, which report sensed data to the Base Station (BS) that requires high energy usage. Many routing protocols have been proposed in this regard achieving energy efficiency in heterogeneous scenarios. However, every protocol is not suitable for heterogeneous WSNs....

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    HSEP: Heterogeneity-Aware Hierarchical Stable Election Protocol for WSNs

    Wireless Sensor Networks (WSNs) are increasing to handle complex situations and functions. In these networks some of the nodes become Cluster Heads (CHs) which are responsible to aggregate data of from cluster members and transmit it to Base Stations (BS). Those clustering techniques which are designed for homogenous network are...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Monitoring and Controlling Power Using Zigbee Communications

    Smart grid is a modified form of electrical grid where generation, transmission, distribution and customers are not only connected electrically but also through strong communication network with each other as well as with market, operation and service provider. For achieving good communication link among them, it is very necessary to...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    A Comprehensive Survey of MAC Protocols for Wireless Body Area Networks

    In this paper, the authors present a comprehensive study of Medium Access Control (MAC) protocols developed for Wireless Body Area Networks (WBANs). In WBANs, small battery-operated on-body or implanted biomedical sensor nodes are used to monitor physiological signs such as temperature, blood pressure, ElectroCardioGram (ECG), ElectroEncephaloGraphy (EEG) etc. They discuss...

    Provided By University of Alaska, Fairbanks

  • White Papers // Aug 2012

    Analytical Survey of Wearable Sensors

    Wearable sensors in Wireless Body Area Networks (WBANs) provide health and physical activity monitoring. Modern communication systems have extended this monitoring remotely. In this paper, various types of wearable sensors discussed, their medical applications like ECG, EEG, blood pressure, detection of blood glucose level, pulse rate, respiration rate and non...

    Provided By University of Alaska, Fairbanks