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Hindawi Publishing
(1830 results)-
Whitepapers
Service-Aware Retransmission Control in Cellular Networks
June 30, 2010, 12:00am PDT
This paper proposes a service-aware cross-layer approach between application/transport layers on the mobile terminal and link layer on the wireless base station to enable dynamic control on the...
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Impact of Bimodal Traffic on Latency in Optical Burst Switching Networks
November 28, 2008, 12:00am PST
This paper analyzes the impact of bimodal traffic composition on latency in optical burst switching networks. In particular, it studies the performance degradation to short-length packets caused...
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Wireless Network Algorithms, Systems, and Applications
February 3, 2010, 12:00am PST
Advances in wireless communication and networking technologies proliferate ubiquitous infrastructure and ad hoc wireless networks, enabling a wide variety of applications ranging from environment...
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Reed-Solomon Turbo Product Codes for Optical Communications: FromCode Optimization to Decoder Design
April 22, 2008, 12:00am PDT
Turbo Product Codes (TPCs) are an attractive solution to improve link budgets and reduce systems costs by relaxing the requirements on expensive optical devices in high capacity optical transport...
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Whitepapers
Towards an Automatic Parameter-Tuning Framework for Cost Optimization on Video Encoding Cloud
October 11, 2011, 12:00am PDT
The emergence of cloud encoding services facilitates many content owners, such as the online video vendors, to transcode their digital videos without infrastructure setup. Such service provider...
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Layered Video Transmission on Adaptive OFDM Wireless Systems
June 20, 2010, 12:00am PDT
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...
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A Forward-Backward Kalman Filter-Based STBC MIMO OFDM Receiver
December 11, 2008, 12:00am PST
Orthogonal Frequency Division Multiplexing (OFDM) has emerged as a modulation scheme that can achieve high data rates over frequency selective fading channel by efficiently handling multipath...
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Whitepapers
Saddle Point Properties and Nash Equilibria for Channel Games
March 4, 2009, 12:00am PST
In this paper, transmission over a wireless channel is interpreted as a two-person zero-sum game, where the transmitter gambles against an unpredictable channel, controlled by nature. Mutual...
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Whitepapers
Parlay X Web Services for Policy and Charging Control in Multimedia Networks
March 27, 2012, 12:00am PDT
The paper investigates the capabilities of Parlay X Web Services for Policy and Charging Control (PCC) in managing all Internet protocol-based Multimedia networks (IMSs). PCC is one of the core...
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Whitepapers
Improving Streaming Capacity InMulti-Channel P2P VoD Systems Via Intra-Channel and Cross-Channel Resource Allocation
December 6, 2011, 12:00am PST
Multi-channel Peer-To-Peer (P2P) Video-on-Demand (VoD) systems can be categorized into independent-channel P2P VoD systems and correlated-channel P2P VoD systems. Streaming capacity for a channel...
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Whitepapers
Application-Oriented Fault Detection and Recovery Algorithm For Wireless Sensor and Actor Networks
September 17, 2012, 12:00am PDT
Recent years have witnessed a growing interest in applications of Wireless Sensor and Actor Networks (WSANs). In WSANs, maintaining interactor connectivity is of vital concern in order to reach...
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Whitepapers
Energy-Efficient Multi-Job Scheduling Model for Cloud Computing and Its Genetic Algorithm
October 19, 2011, 12:00am PDT
For the problem that the energy efficiency of the cloud computing data center is low, from the point of view of the energy efficiency of the servers, the authors propose a new energy-efficient...
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Whitepapers
Optimal Superimposed Training Sequences for Channel Estimation in MIMO-OFDM Systems
February 10, 2010, 12:00am PST
In this paper an iterative time domain Least Squares (LS) based channel estimation method using Superimposed Training (ST) for a Multiple Input Multiple Output Orthogonal Frequency Division...
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Whitepapers
Design and Performance Evaluation of an Adaptive Resource Management Framework for Distributed Real-Time and Embedded Systems
January 2, 2008, 12:00am PST
Achieving end-to-end Quality of Service (QoS) in Distributed Real-time Embedded (DRE) systems require QoS support and enforcement from their underlying operating platforms that integrates many...
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Whitepapers
On the Reusage of Primary Radio Resources Through the Exploitation of the Spatiotemporal Robustness of the MIMO Transmissions
August 14, 2012, 12:00am PDT
The spatiotemporal robustness of the MIMO transmissions is exploited aiming at inducing opportunistic secondary communications on the primary radio resources. The proposed model makes use of the...
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Whitepapers
Cooperative Transmission in Cognitive Radio Ad Hoc Networks
March 21, 2012, 12:00am PDT
Cognitive radio technology is the key to realize dynamic spectrum access system and promote the spectrum utilization through exploiting the spectrum holes left by primary users. However, the...
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Whitepapers
A System View on Iterative MIMO Detection: Dynamic Sphere Detection Versus Fixed Effort List Detection
January 27, 2012, 12:00am PST
Multiple-antenna systems are a promising approach to increase the data rate of wireless communication systems. One efficient possibility is spatial multiplexing of the transmitted symbols over...
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Optimizing Cooperative Cognitive Radio Networks with Opportunistic Access
March 20, 2012, 12:00am PDT
Optimal resource allocation for cooperative cognitive radio networks with opportunistic access to the licensed spectrum is studied. Resource allocation is based on minimizing the symbol error rate...
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Whitepapers
PCA-Guided Routing Algorithm for Wireless Sensor Networks
November 11, 2012, 12:00am PST
An important performance concern for Wireless Sensor Networks (WSNs) is the total energy dissipated by all the nodes in the network over the course of network lifetime. In this paper, the authors...
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Whitepapers
Toward a Practical Technique to Halt Multiple Virus Outbreaks on Computer Networks
October 23, 2012, 12:00am PDT
Malicious software, or malware, on the Internet can cause serious problems, not only for services like email and the web, but for electricity, transport, finance, and healthcare services due to...
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Whitepapers
Performance Analysis of the IEEE 802.11s PSM
October 18, 2012, 12:00am PDT
With the introduction of IEEE 802.11 Power Save Mode (PSM), a lot of work has been done to enhance the energy saving ability of the wireless nodes. The ultimate goal of the research is to make the...
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Whitepapers
Formal Analysis of SET and NSL Protocols Using the Interpretation Functions-Based Method
June 27, 2012, 12:00am PDT
Most applications in the Internet such as e-banking and e-commerce use the SET and the NSL protocols to protect the communication channel between the client and the server. Then, it is crucial to...
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Whitepapers
Experimental Evaluation of a SIP-Based Home Gateway with Multiple Wireless Interfaces for Domotics Systems
October 9, 2012, 12:00am PDT
In modern houses, the presence of sensors and actuators is increasing, while communication services and entertainment systems had long since settled into everyday life. The utilization of wireless...
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Whitepapers
Delay-Tolerant, Low-Power Protocols for Large Security-Critical Wireless Sensor Networks
October 23, 2012, 12:00am PDT
This paper reports the analysis, implementation, and experimental testing of a delay-tolerant and energy-aware protocol for a wireless sensor node, oriented to security applications. The solution...
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Whitepapers
An Approach for Network Outage Detection from Drive-Testing Databases
September 25, 2012, 12:00am PDT
A data-mining framework for analyzing a cellular network drive testing database is described in this paper. The presented method is designed to detect sleeping base stations, network outage, and...
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Whitepapers
Effective Stochastic Modeling of Energy-Constrained Wireless Sensor Networks
September 11, 2012, 12:00am PDT
Energy consumption of energy-constrained nodes in Wireless Sensor Networks (WSNs) is a fatal weakness of these networks. Since, these nodes usually operate on batteries, the maximum utility of the...
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Whitepapers
Selective Forwarding Attacks Against Data and ACK Flows in Network Coding and Countermeasures
September 27, 2012, 12:00am PDT
Network coding has attracted the attention of many researchers in security and cryptography. In this paper, a well-known attack selective forwarding attack will be studied in network coding...
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Whitepapers
ILP Model and Relaxation-Based Decomposition Approach for Incremental Topology Optimization in p-Cycle Networks
October 7, 2012, 12:00am PDT
P-cycle networks have attracted a considerable interest in the network survivability literature in recent years. However, most of the existing work assumes a known network topology upon which to...
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Whitepapers
A Fusion Approach of RSSI and LQI for Indoor Localization System Using Adaptive Smoothers
August 30, 2012, 12:00am PDT
Due to the ease of development and inexpensiveness, indoor localization systems are getting a significant attention but, with recent advancement in context and location aware technologies, the...
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Whitepapers
Deco: A Decentralized, Cooperative Atomic Commit Protocol
September 11, 2012, 12:00am PDT
An atomic commit protocol can cause long-term locking of databases if the coordinator crashes or becomes disconnected from the network. In this paper, the authors describe how to eliminate the...
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Whitepapers
Energy Efficiency Adaptation for Multihop Routing in Wireless Sensor Networks
September 17, 2012, 12:00am PDT
Wireless Sensor Networks (WSNs) are considered as a suitable solution for long-time and large-scale outdoor environmental monitoring. However, an important feature that distinguishes the WSNs from...
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Whitepapers
A DHT-Based Discovery Service for the Internet of Things
September 17, 2012, 12:00am PDT
Current trends towards the Future Internet are envisaging the conception of novel services endowed with context-aware and autonomic capabilities to improve end users' quality of life. The Internet...
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Whitepapers
Benefits of Self-Organizing Networks (SON) for Mobile Operators
September 4, 2012, 12:00am PDT
Self-Organizing Networks (SON) is a collection of functions for automatic configuration, optimization, diagnostisation and healing of cellular networks. It is considered to be a necessity in...
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Whitepapers
Power-Management Techniques for Wireless Sensor Networks and Similar Low-Power Communication Devices Based on Nonrechargeable Batteries
August 22, 2012, 12:00am PDT
Despite the well-known advantages of communication solutions based on energy harvesting, there are scenarios where the absence of batteries (super-capacitor only) or the use of rechargeable...
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Whitepapers
Route Anomaly Detection Using a Linear Route Representation
June 2, 2012, 12:00am PDT
A location-based service is a service based on the geographical position of a mobile handheld device like a Smartphone. This research proposes location-based research, which uses location...
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Whitepapers
Dynamic Resource Management in 802.11 Wireless Mesh Networks
June 26, 2012, 12:00am PDT
The association/handoff procedures are important components in a balanced operation of 802.11-based wireless mesh networks. In this paper, the authors introduce the concept of cooperative...
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Whitepapers
A Survey On Multipacket Reception for Wireless Random Access Networks
July 23, 2012, 12:00am PDT
MultiPacket Reception (MPR) is the capability of simultaneous decoding of more than one packet from multiple concurrent transmissions. Continuous investigations on increasing the reception...
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Whitepapers
Troubleshooting Assistance Services in Community Wireless Networks
August 16, 2012, 12:00am PDT
The authors have identified new services intended for users and administrators of community wireless networks. Troubleshooting assistance services will assist the users during solution of...
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Whitepapers
Cognitive Code-Division Channelization with Admission Control
May 9, 2012, 12:00am PDT
The authors consider the problem of joint resource allocation and admission control in a secondary code-division network coexisting with a narrowband primary system. Their objective is to find the...
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Whitepapers
The Concept of the Remote Devices Content Management
July 31, 2012, 12:00am PDT
Modern mobile communication devices which are often used as remote access to information systems bring up many advantages for user. Unfortunately in some cases when user has several different...
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Whitepapers
Ultra-Wideband Geo-Regioning: A Novel Clustering and Localization Technique
October 17, 2007, 12:00am PDT
Ultra-WideBand (UWB) technology enables a high temporal resolution of the propagation channel. Consequently, a channel impulse response between transmitter and receiver can be interpreted as...
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Whitepapers
Time-Independent Data Collection Protocol InMobility-Assistant Wireless Sensor Networks With Duty Cycles
February 26, 2012, 12:00am PST
Mobility-assistant sensor networks comprise mobile elements, and static sensors are established for the purpose of solving the serious problems such as overlapping or energy holes in Wireless...
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Whitepapers
Intelligent Agent-Based Intrusion Detection System Using Enhanced Multiclass SVM
July 5, 2012, 12:00am PDT
Intrusion detection systems were used in the past along with various techniques to detect intrusions in networks effectively. However, most of these systems are able to detect the intruders only...
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Whitepapers
Performance Evaluation of an Object Management Policy Approach for P2P Networks
October 5, 2011, 12:00am PDT
In this paper, the authors propose and analyze an object management policy approach for video web cache in a P2P context, taking advantage of object's metadata, for example, video popularity, and...
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Whitepapers
A Gain-Computation Enhancements Resource Allocation for Heterogeneous Service Flows in IEEE 802.16m Mobile Networks
October 26, 2011, 12:00am PDT
In this paper, the authors deal with radio resource allocation in Fourth Generation (4G) wireless mobile networks based on Orthogonal Frequency Division Multiple Access (OFDMA) as an access...
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Whitepapers
Background Traffic-Based Retransmission Algorithm for Multimedia Streaming Transfer Over Concurrent Multipaths
May 2, 2012, 12:00am PDT
The content-rich multimedia streaming will be the most attractive services in the next-generation networks. With function of distribute data across multipath end-to-end paths based on SCTP's...
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Whitepapers
Secure and Reliable IPTV Multimedia Transmission Using Forward Error Correction
May 22, 2012, 12:00am PDT
With the wide deployment of Internet Protocol (IP) infrastructure and rapid development of digital technologies, Internet Protocol TeleVision (IPTV) has emerged as one of the major multimedia...
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Whitepapers
QoS Supported IPTV Service Architecture Over Hybrid-Tree-Based Explicit Routed Multicast Network
March 30, 2012, 12:00am PDT
With the rapid advance in multimedia streaming and multicast transport technology, current IP multicast protocols, especially PIM-SM, become the major channel delivery mechanism for IPTV system...
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Whitepapers
Rate Adaptive Selective Segment Assignment for Reliable Wireless Video Transmission
April 17, 2012, 12:00am PDT
A reliable video communication system is proposed based on data partitioning feature of H.264/AVC, used to create a layered stream, and LT codes for erasure protection. The proposed scheme termed...
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A Secure and Stable Multicast Overlay Network with Load Balancing for Scalable IPTV Services
March 31, 2012, 12:00am PDT
In this paper, the authors use SIP protocol to construct a secure application-layer multicast overlay network for IPTV, called SIPTVMON. SIPTVMON can secure all the IPTV media delivery paths...
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Whitepapers
Video Classification and Adaptive QoP/QoS Control for Multiresolution Video Applications on IPTV
April 5, 2012, 12:00am PDT
With the development of heterogeneous networks and video coding standards, multi-resolution video applications over networks become important. It is critical to ensure the service quality of the...
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Whitepapers
Adjustable Two-Tier Cache for IPTV Based on Segmented Streaming
March 10, 2012, 12:00am PST
Internet Protocol TV (IPTV) is a promising Internet killer application, which integrates video, voice, and data onto a single IP network, and offers viewers an innovative set of choices and...
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Whitepapers
Efficient Wireless Broadcasting Through Joint Network Coding and Beamforming
November 18, 2011, 12:00am PST
The authors develop a framework that exploits Network Coding (NC) and Multiple-Input/Multiple-Output (MIMO) techniques, jointly together, to improve throughput of downlink broadcast channels....
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Whitepapers
LDPC FEC Code Extension for Unequal Error Protection in DVB-T2 System: Design and Evaluation
December 10, 2011, 12:00am PST
The Digital Video Broadcasting organisation has recently introduced the second generation of terrestrial broadcast transmission standards, DVB-T2. The newly introduced tools ensure significant...
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Whitepapers
PAPR Reduction of OFDM Signals by Novel Global Harmony Search in PTS Scheme
November 17, 2012, 12:00am PST
The Orthogonal Frequency Division Multiplexing (OFDM) modulation technique is one of the key strategies for multiuser signal transmission especially in smart grids and wind farms. This paper...
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Whitepapers
Client-Driven Joint Cache Management and Rate Adaptation for Dynamic Adaptive Streaming Over HTTP
January 3, 2013, 12:00am PST
Due to the fact that proxy-driven proxy cache management and the client-driven streaming solution of Dynamic Adaptive Streaming over HTTP (DASH) are two independent processes, some difficulties...
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Whitepapers
Impact of Antenna Placement on Frequency Domain Adaptive Antenna Array in Hybrid FRF Cellular System
September 7, 2012, 12:00am PDT
Frequency Domain Adaptive Antenna Array (FDAAA) is an effective method to suppress interference caused by frequency selective fading and Multiple-Access Interference (MAI) in Single-Carrier (SC)...
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Whitepapers
Adaptive Forming of the Beam Pattern of Microstrip Antenna with the Use of an Artificial Neural Network
September 2, 2012, 12:00am PDT
Microstrip antenna has been recently one of the most innovative fields of antenna techniques. The main advantage of such an antenna is the simplicity of its production, little weight, a narrow...
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Whitepapers
Multislot Antenna with a Screening Backplane for UWB WBAN Applications
August 23, 2012, 12:00am PDT
A novel Multi-Slot Antenna with a conducting BackPlane reflector (MSA-BP) designed for ultra-wideband Wireless Body Area Networks (WBANs) applications is presented. The objective is to achieve a...
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Whitepapers
Geometry-Based Stochastic Modeling for MIMO Channel in High-Speed Mobile Scenario
September 29, 2012, 12:00am PDT
High-speed railway is playing an important role in the transportation of China. The wireless train control system is essential for the train management and safety. The geometry-based stochastic...
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Whitepapers
Printed Internal Pentaband WWAN Antenna Using Chip-Inductor-Loaded Shorting Strip for Mobile Phone Application
September 17, 2012, 12:00am PDT
Mobile phone antennas with compact size, low profile, and wide operation band characteristics have attracted great attention both in academic and industrial field. In recent years, a variety of...
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Whitepapers
Differences in User Influence on MIMO Handset Antenna Performance in Reverberation Chamber
October 7, 2012, 12:00am PDT
User influence on Multiple-Input Multiple-Output (MIMO) performance is studied for different dual antenna handsets specially designed to have good and bad MIMO performance. The study reveals that...
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Whitepapers
Elevated CPW-Fed Slotted Microstrip Antenna for Ultra-Wideband Application
September 8, 2012, 12:00am PDT
Recently, a considerable amount of researches have been devoted to the development of UWB antenna for its enabling high data transmission rates, low power consumption, and simple hardware...
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Whitepapers
SAR Experiments Using a Conformal Antenna Array Radar Demonstrator
September 3, 2012, 12:00am PDT
Conformal antenna arrays have been studied for several years but only few examples of applications in modern radar or communication systems may be found up to date due to technological...
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A Review of Antennas for Indoor Positioning Systems
October 15, 2012, 12:00am PDT
In this paper, the authors provide a review of antennas applied for indoor positioning or localization systems. The desired requirements of those antennas when integrated in anchor nodes...
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Whitepapers
Performance Evaluation of Closed-Loop Spatial Multiplexing Codebook Based on Indoor MIMO Channel Measurement
October 24, 2012, 12:00am PDT
Closed-loop MIMO technique standardized in LTE can support different layer transmissions through pre-coding operation to match the channel multiplexing capability. However, the performance of the...
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Whitepapers
High Gain Array of Monopoles-Coupled Antennas for Wireless Applications
October 11, 2012, 12:00am PDT
An array of monopole antennas over a ground plane that radiates a directive lobe in the end-fire direction are described in this paper. The design uses the rigorous method described by Drouet et...
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Whitepapers
An Efficient Analysis Method for Cylindrical Conformal Microstrip Antenna Fed by Microstripline
October 27, 2012, 12:00am PDT
Firstly, a domain-division solution is provided in this paper, which can solve Hankel function's singular problem of Sommerfeld integral in calculating the spatial domain Green function for...
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Whitepapers
Compact, Frequency Reconfigurable, Printed Monopole Antenna
October 19, 2012, 12:00am PDT
In this paper, the authors propose a possible implementation of a compact printed monopole antenna, useful to operate in UMTS and WLAN bands. In order to accomplish that, a miniaturization...
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Whitepapers
High Gain Compact Strip and Slot UWB Sinuous Antennas
October 17, 2012, 12:00am PDT
In the last two decades, the advances in communication technology, in particular mobile communications have drastically changed the lifestyles of people. Antenna engineers have contributed to this...
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Reconfigured and Notched Tapered Slot UWB Antenna for Cognitive Radio Applications
October 22, 2012, 12:00am PDT
A compact reconfigurable and notched Ultra-WideBand (UWB) Tapered Slot Antenna (TSA) is presented. The antenna reconfiguration operation principle relies on 2 mechanisms: in the first mechanism a...
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Whitepapers
State Modelling of the Land Mobile Propagation Channel with Multiple Satellites
October 8, 2012, 12:00am PDT
The authors evaluate a new approach for multisatellite state modelling: the Master-Slave approach. By this concept slave satellites are modelled according to an existing master, whereas the...
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Development of a Novel Double-Ring Deployable Mesh Antenna
October 19, 2012, 12:00am PDT
In this paper, the authors address a type of deployable mesh antenna consisting of the double-ring deployable truss edge frame and the cable net reflector. The structural design concept of the...
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Whitepapers
Angular Beamforming Technique for MIMO Beamforming System
November 6, 2012, 12:00am PST
The method of MIMO beamforming has gained a lot of attention. The Eigen Beamforming (EB) technique provides the best performance but requiring full channel information. In this paper, the authors...
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Whitepapers
A Compact Multiband Notch UWB Antenna
November 27, 2012, 12:00am PST
Federal Communication Commission released the commercial operation UWB within the frequency range 3.1 - 10.6GHz in 2002. To reduce the interferences from WLAN bands, WiMAX, and some C band...
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Whitepapers
Comparison of Mutual Coupling Phenomena in Subwavelength Ridged Circular Apertures and Half-Wavelength Dipole Antenna Arrays
December 1, 2012, 12:00am PST
The resonant microwave transmission characteristics of several coupled sub-wavelength ridged circular aperture arrangements in a thin metallic film are investigated using the Three-Dimensional...
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Whitepapers
A Multistage Decision-Feedback Receiver Design for LTE Uplink in Mobile Time-Variant Environments
August 26, 2012, 12:00am PDT
Single-Carrier-Frequency Division Multiple Access (SC-FDMA) has recently become the preferred uplink transmission scheme in Long-Term Evolution (LTE) systems. Similar to Orthogonal Frequency...
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Whitepapers
A Compact UWB Antenna with a Quarter-Wavelength Strip in a Rectangular Slot for 5.5 GHz Band Notch
December 19, 2012, 12:00am PST
The limitation of the ElectroMagnetic Interferences (EMIs) caused by UWB radiating sources into WLAN/WiMAX communication systems operating in the frequency band located around 5.5 GHz requires the...
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Whitepapers
Structure-Based Evolutionary Programming Design of Broadband Wire Antennas
December 21, 2012, 12:00am PST
A design technique for wire antennas, based on the Structure-Based Evolutionary Programming, is used to design a broadband antenna with an end-fire radiation pattern and a very simple geometry,...
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Whitepapers
A Twin Spiral Planar Antenna for UWB Medical Radars
November 19, 2012, 12:00am PST
A planar-spiral antenna to be used in an UltraWideBand (UWB) radar system for heart activity monitoring is presented. The antenna, named "Twin," is constituted by two spiral dipoles in a compact...
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