Hindawi Publishing

Displaying 1-40 of 1626 results

  • White Papers // Aug 2010

    Securing Embedded Smart Cameras With Trusted Computing

    Camera systems are used in many applications including video surveillance for crime prevention and investigation, traffic monitoring on highways or building monitoring and automation. With the shift from analog towards digital systems, the capabilities of cameras are constantly increasing. Today's smart camera systems come with considerable computing power, large memory,...

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  • White Papers // Jun 2010

    Hybrid Data Fusion and Tracking for Positioning With GNSS and 3GPP-LTE

    Global Navigation Satellite Systems (GNSSs) can provide reliable positioning information under optimum conditions, where at least four satellites can be accessed with sufficient quality. In critical situations, for example, urban canyons or indoor, due to blocking of satellites by buildings and severe multipath effects, the GNSS performance can be decreased...

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  • White Papers // Jul 2011

    A Reliable and Efficient MAC Protocol for Underwater Acoustic Sensor Networks

    UnderWater Acoustic Sensor Networks (UWASNs) are playing a key role in ocean applications. Unfortunately, the efficiency of UWASNs is inferior to that of the Terrestrial Wireless Sensor Networks (TWSNs). The main reasons are as follows: UWASNs suffer long propagation delay; UWASNs are limited by the narrow bandwidth. Many MAC protocols...

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  • White Papers // Jun 2011

    Modeling and Performance Analysis of Energy Efficiency Binary Power Control in MIMO-OFDM Wireless Communication Systems

    The energy efficiency optimization of the binary power control scheme for MIMO-OFDM wireless communication systems is formulated, and then a global optimization solution of power allocation is derived. Furthermore, a new Energy Efficiency Binary Power Control (EEBPC) algorithm is designed to improve the energy efficiency of MIMO-OFDM wireless communication systems....

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  • White Papers // Jun 2011

    Quadratic Programming for TDMA Scheduling in Wireless Sensor Networks

    This paper presents a novel Multi-hop Aperiodic Scheduling (MAS) algorithm which guarantees energy-efficient data collection by Wireless Sensor Networks (WSNs) under delay constraints. Present Medium Access Control (MAC) protocols in WSNs typically sacrifice packet latency and/or the reliability of packet transfer to achieve energy-efficiency. Thus, the paper is concerned with...

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  • White Papers // Jul 2011

    Distributed Algorithm for Traffic Data Collection and Data Quality Analysis Based on Wireless Sensor Networks

    The growing need of the real-time traffic data has spurred the deployment of large-scale dedicated monitoring infrastructure systems, which mainly consist of the use of inductive loop detectors. However, the loop sensor data is prone to be noised or even missed under harsh environment. The state-of-the-art wireless sensor networks provide...

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  • White Papers // Jul 2011

    Bayesian Network-Based High-Level Context Recognition for Mobile Context Sharing in Cyber-Physical System

    With the recent proliferation of smart phones, they become useful tools to implement high-confidence cyber-physical systems. Among many applications, context sharing systems in mobile environment attract attention with the popularization of social media. Mobile context sharing systems can share more information than web-based social network services because they can use...

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  • White Papers // Jul 2011

    AMobile-Beacon-Assisted Sensor Network Localization Based on RSS and Connectivity Observations

    Determining the physical positions of sensors has been a fundamental and crucial problem in Wireless Sensor Networks (WSNs). Due to the inherent characteristics of WSNs, extremely limited resources available at each low-cost and tiny sensor node, connectivity-based range-free solutions could be a better choice to feature a low overall system...

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  • White Papers // Jul 2011

    Triangular Energy-Saving Cache-Based Routing Protocol by Energy Sieving

    In wireless ad hoc networks, designing an energy-efficient routing protocol is a major issue since nodes are energy limited. To address energy issue, the authors proposed a Triangular Energy-Saving Cached-based routing protocol by Energy Sieving (TESCES). TESCES offered a Grid Leader Election by Energy Sieving (GLEES), a Cache-based Grid Leader...

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  • White Papers // Aug 2011

    Intelligent Collaborative Event Query Algorithm in Wireless Sensor Networks

    Event query processing is a very important issue in Wireless Sensor Networks (WSNs). In order to detect event early and provide monitoring information and event query timely in WSNs, an efficient Intelligent Collaborative Event Query (ICEQ) algorithm is proposed, in which sensor nodes that are near to the boundary of...

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  • White Papers // Jul 2011

    Ion-6: A Positionless Self-Deploying Method for Wireless Sensor Networks

    Sensor networks are deployed to monitor the interested area. Maximizing the sensing coverage depends on effectively determining the locations of sensors. In this paper, a self-deploying method named as Ion-6 is proposed. Sensors are modeled as ions, and the links between them are treated as ionic bonds. When the number...

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  • White Papers // May 2011

    SEF: A Secure, Efficient, and Flexible Range Query Scheme in Two-Tiered Sensor Networks

    Large-scale wireless sensor networks follow the two-tiered architecture, where master nodes take charge of storing data and processing queries. However, if a master node is compromised, the information stored in it may be exposed, and query results can be juggled. This paper presents a novel scheme called SEF for secure...

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  • White Papers // Jun 2011

    Total Least Squares Method for Robust Source Localization in Sensor Networks Using TDOA Measurements

    The TDOA-based source localization problem in sensor networks is considered with sensor node location uncertainty. A Total Least Squares (TLSs) algorithm is developed by a linear closed-form solution for this problem, and the uncertainty of the sensor location is formulated as a perturbation. The sensitivity of the TLS solution is...

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  • White Papers // May 2011

    A Scalable MAC Protocol Supporting Simple Multimedia Traffic QoS in WSNs

    Wireless Sensor Networks (WSNs) are a vibrant research field for the last several years. Especially, design of MAC protocols supporting multimedia traffic QoS is recent challenging work. However, the mechanisms of protocols that can guarantee multimedia traffic QoS have several problems in multi-hop wireless sensor networks. There are a lot...

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  • White Papers // May 2011

    A Biometric Key Establishment Protocol for Body Area Networks

    Current advances in semiconductor technology have made it possible to implant a network of biosensors inside the human body for health monitoring. In the context of a Body Area Network (BAN), the confidentiality and integrity of the sensitive health information is particularly important. In this paper, the authors present an...

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  • White Papers // Jun 2011

    A Game Theoretic Approach for Interuser Interference Reduction in Body Sensor Networks

    As a kind of small-scale Cyber-Physical Systems (CPSs), Body Sensor Networks (BSNs) can provide the pervasive, long-term, and real-time health monitoring. A high degree of Quality-of-Service (QoS) for BSN is extremely required to meet some critical services. Interuser interference between different BSNs can cause unreliable critical data transmission and high...

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  • White Papers // Jul 2011

    Link Prediction and Route Selection Based on Channel State Detection in UASNs

    In Underwater Acoustic Sensor Networks (UASNs), data route is often disrupted by link interruption which will further lead to incorrect data transmission due to high propagation delay, Doppler effect, and the vulnerability of water environment in acoustic channel. So how to correctly transmit data when there are interrupted links on...

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  • White Papers // Feb 2010

    Wireless Network Algorithms, Systems, and Applications

    Advances in wireless communication and networking technologies proliferate ubiquitous infrastructure and ad hoc wireless networks, enabling a wide variety of applications ranging from environment monitoring to health care, from critical infrastructure protection to wireless security, to name just a few. The complexity and ramifications of the fast-growing number of mobile...

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  • White Papers // Jun 2010

    Layered Video Transmission on Adaptive OFDM Wireless Systems

    Future wireless video transmission systems will consider Orthogonal Frequency Division Multiplexing (OFDM) as the basic modulation technique due to its robustness and low complexity implementation in the presence of frequency-selective channels. Recently, adaptive bit loading techniques have been applied to OFDM showing good performance gains in cable transmission systems. In...

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  • White Papers // Sep 2014

    P-LEACH: An Efficient Cluster-Based Technique to Track Mobile Sinks in Wireless Sensor Networks

    For a Wireless Sensor Network (WSN) with a large number of inexpensive sensor nodes, energy efficiency is the major concern in designing network structure and related algorithms. If network collects sensor data using mobile sinks, object tracking mechanism must consider the energy efficiency of sensor nodes in the networks as...

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  • White Papers // Sep 2014

    An Energy-Efficient Data Collection Method for Wireless Multimedia Sensor Networks

    In Wireless Sensor Networks (WSNs), some sensor nodes transmit their acquired data to a far distant base station directly or by linking several relay nodes. WSNs might not be able to operate if a sensor node completely consumes its battery power and does not perform its designated operation. Semiconductor technology...

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  • White Papers // Sep 2014

    L2ER: Low-Latency and Energy-Based Routing Protocol for Cognitive Radio Ad Hoc Networks

    Cognitive Radio Ad Hoc Networks (CRAHNs) are active, self-organized, and dynamic networks, in which cognitive users can communicate with each other in an ad hoc fashion. Various delay and energy-based routing protocols have been proposed for CRAHNs. However, these protocols do not consider the delay and node energy in the...

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  • White Papers // May 2014

    A Hybrid Load Balancing Scheme for Games in Wireless Networks

    A wireless network consists of a large number of nodes with limited resources. The large number of event data will be generated over a period of time in a wireless network. Also, faced with high resource demand variability and with misfit resource renting policies, the current practices is to overprovision...

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  • White Papers // Sep 2009

    AD-PLL for WiMAX with Digitally-Regulated TDC and Glitch Correction Logic

    In this paper, the authors describe the design of an All-Digital Phase Locked Loop (AD-PLL) for wireless applications in the WiMAX 3.3 - 3.8GHz bandwidth. The Time/Digital Converter (TDC) sets the in-band noise and it may be responsible for the presence of spurious tones at the PLL output. The TDC...

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  • White Papers // May 2012

    Virtual Network Embedding: A Hybrid Vertex Mapping Solution for Dynamic Resource Allocation

    Virtual Network Embedding (VNE) is a key area in network virtualization, and the overall purpose of VNE is to map virtual networks onto an underlying physical network referred to as a substrate. Typically, the virtual networks have certain demands, such as resource requirements, that need to be satisfied by the...

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  • White Papers // Apr 2012

    Bit Rate Optimization with MMSE Detector for Multicast LP-OFDM Systems

    The authors propose a new resource allocation algorithm with Minimum Mean Square Error (MMSE) detector for multicast Linear Pre-coded Orthogonal Frequency Division Multiplexing (LP-OFDM) systems. To increase the total multicast bit rate, this algorithm jointly uses the LP-OFDM modulation technique and an adaptation of the OFDM-based multicast approaches to exploit...

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  • White Papers // May 2012

    Analytical Evaluation of the Performance of Proportional Fair Scheduling in OFDMA-Based Wireless Systems

    This paper provides an analytical evaluation of the performance of Proportional Fair (PF) scheduling in Orthogonal Frequency-Division Multiple Access (OFDMA) wireless systems. OFDMA represents a promising multiple access scheme for transmission over wireless channels, as it combines the Orthogonal Frequency Division Multiplexing (OFDM) modulation and subcarrier allocation. On the other...

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  • White Papers // Apr 2012

    Information-Theoretic Analysis of Underwater Acoustic OFDM Systems in Highly Dispersive Channels

    This paper investigates the signal-to-interference ratio and the achievable rates of Underwater Acoustic (UA) OFDM systems over channels where time and frequency dispersion are high enough that: neither the transmitter nor the receiver can have a priori knowledge of the channel state information and Inter-Symbol/Inter-Carrier Interference (ISI/ICI) cannot be neglected...

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  • White Papers // May 2012

    Optimizing Spectrum Trading in Cognitive Mesh Network Using Machine Learning

    With the explosion of the number of emerging wireless applications for mobile users, the frequency spectrum has become congested to support the dramatic increase in the demand for the limited spectrum. In a cognitive wireless mesh network, licensed users (primary users, PUs) may rent surplus spectrum to unlicensed users (secondary...

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  • White Papers // Feb 2012

    UWB Localization System for Indoor Applications: Concept, Realization and Analysis

    A complete impulse-based ultra-wideband localization demonstrator for indoor applications is presented. The positioning method, along with the method of positioning error predicting, based on scenario geometry, is described. The hardware setup, including UWB transceiver and time measurement module, as well as the working principles is explained. The system simulation, used...

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  • White Papers // Jan 2012

    Minimum Symbol Error Probability MIMO Design Under the Per-Antenna Power Constraint

    Approximate minimum symbol error probability transceiver design of single user MIMO systems under the practical per-antenna power constraint is considered. The upper bound of a lower bound on the minimum distance between the symbol hypotheses is established. Necessary conditions and structures of the transmit covariance matrix for reaching the upper...

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  • White Papers // Jan 2012

    Analytical Model of a Weighted Round Robin Service System

    This paper presents a mathematical description of Weighted Round Robin service strategy, on which basis all the perspective QoS tools that serve to manage congestion in converged packet networks work. On the basis of the presented mathematical model, it is possible to suitably configure the operational parameters (maximum queue length,...

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  • White Papers // Nov 2011

    A State-Based Modeling Approach for Efficient Performance Evaluation of Embedded System Architectures at Transaction Level

    Abstract models are necessary to assist system architects in the evaluation process of hardware/software architectures and to cope with the still increasing complexity of embedded systems. Efficient methods are required to create reliable models of system architectures and to allow early performance evaluation and fast exploration of the design space....

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  • White Papers // Jan 2012

    Ranging Performance of the IEEE 802.15.4a UWB Standard Under FCC/CEPT Regulations

    The IEEE 802.15.4a standard for wireless sensor networks is designed for high-accuracy ranging using Ultra-WideBand (UWB) signals. It supports coherent and non-coherent (energy detector) receivers, thus the performance-complexity-tradeoff can be decided by the implementer. In this paper, the maximum operating range and the maximum allowed path-loss are analyzed for ranging...

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  • White Papers // Jan 2012

    Efficient Dual Domain Decoding of Linear Block Codes Using Genetic Algorithms

    A computationally efficient algorithm for decoding block codes is developed using a Genetic Algorithm (GA). The proposed algorithm uses the dual code in contrast to the existing genetic decoders in the literature that use the code itself. Hence, this new approach reduces the complexity of decoding the codes of high...

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  • White Papers // Jan 2012

    Transmission Network Expansion Planning Considering Phase-Shifter Transformers

    This paper presents a novel mathematical model for the transmission network expansion planning problem. Main idea is to consider Phase-Shifter (PS) transformers as a new element of the transmission system expansion together with other traditional components such as transmission lines and conventional transformers. In this way, PS is added in...

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  • White Papers // Oct 2011

    Iterative Signal Processing for Mitigation of Analog-to-Digital Converter Clipping Distortion in Multiband OFDMA Receivers

    In modern wideband communication receivers, the large input-signal dynamics is a fundamental problem. Unintentional signal clipping occurs, if the receiver front-end with the analog-to-digital interface cannot respond to rapidly varying conditions. This paper discusses digital post-processing compensation of such unintentional clipping in multiband OFDMA receivers. The proposed method iteratively mitigates...

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  • White Papers // Dec 2011

    Analysis and Mitigation of the Narrowband Interference Impact on IR-UWB Communication Systems

    The impact of narrowband interference signals on impulse radio Ultra-WideBand (UWB) communication system has been investigated. A closed form expression for the bit error rate performance of UWB communication system in a Log-normal flat fading channel under such impact is evaluated. The actual UWB channel model is known as a...

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  • White Papers // Dec 2011

    On Particle Swarm Optimization for MIMO Channel Estimation

    Multiple-Input Multiple-Output (MIMO) transmission is considered as a key technology to reach the challenging goals of upcoming wireless standards, such as Long-Term Evolution Advanced (LTE-A). A wide range of MIMO detectors are known in the literature offering a performance close to the channel capacity. Precise Channel State Information (CSI) is...

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  • White Papers // Nov 2011

    An Enhanced Genetic Algorithm to Solve the Static and Multistage Transmission Network Expansion Planning

    An Enhanced Genetic Algorithm (EGA) is applied to solve the Long-Term Transmission Expansion Planning (LTTEP) problem. The following characteristics of the proposed EGA to solve the static and multistage LTTEP problem are presented: generation of an initial population using fast, efficient heuristic algorithms; better implementation of the local improvement phase;...

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