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IARIA
(743 results)-
White Papers
TREMA: A Tree-Based Reputation Management Solution for P2P Systems
April 30, 2012, 12:00am PDT
Trust is an important aspect of Peer-To-Peer (P2P) systems, because in such systems, peers are usually anonymous. A popular method for evaluating trust in P2P systems is to use reputation, where...
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White Papers
A New Pattern Template to Support the Design of Security Architectures: A Case Study
April 30, 2012, 12:00am PDT
New work paradigms are emerging in the information technology sector, which are causing changes in the technological infrastructures of organizations' information systems. Organizations should...
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White Papers
iPrivacy: A Distributed Approach to Privacy on the Cloud
April 30, 2012, 12:00am PDT
The increasing adoption of Cloud storage poses a number of privacy issues. Users wish to preserve full control over their sensitive data and cannot accept that it is accessible by the remote...
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White Papers
A Trust-Based Approach for Secure Packet Transfer in Wireless Sensor Networks
April 30, 2012, 12:00am PDT
Trust is an important factor in transferring data from the source to destination in wireless sensor networks. If any sensor node fails to transfer the data, the Dynamic Source Protocol calculates...
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White Papers
Eruption of Policy in the Charging Arena
April 30, 2012, 12:00am PDT
In the early days of mobile Internet, bandwidth was not an issue, so price plans were quite simple, very often expressed in the form of a flat rate or "All you can eat" pricing. As long as...
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White Papers
The Secure Access Node Project: A Hardware-Based Large-Scale Security Solution for Access Networks
April 30, 2012, 12:00am PDT
Providing network security is one of the most important tasks in today's Internet. Unfortunately, many users are not able to protect themselves and their networks. Therefore, a novel security...
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White Papers
Efficient Rate Adaptive Resource Allocation Scheme in Uplink OFDMA Wireless Systems
July 11, 2011, 12:00am PDT
The problem of resource allocation for the uplink of wireless SISO-OFDMA systems is investigated. To relieve heavy computational burden, a suboptimal, but efficient scheme is devised which...
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White Papers
Resource Allocation Algorithm for MISO-OFDMA Systems With QoS Provisioning
July 11, 2011, 12:00am PDT
The problem of user selection and resource allocation for the downlink of wireless systems operating over a frequency-selective channel is investigated. It is assumed that the Base Station (BS)...
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White Papers
An Effective Transmit Weight Design for DPC With Maximum Beam in Multi-User MIMO Downlink
July 11, 2011, 12:00am PDT
A novel transmit scheme is proposed for the cancellation of Inter-User Interference (IUI) and the improvement of achievable sum-rate of system in Multi-User Multiple-Input Multiple Output...
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White Papers
MLD-Based MFSK Demodulation on MIMO Frequency Selective Fading Channel
July 11, 2011, 12:00am PDT
In this paper, the authors have proposed the novel demodulation scheme of MFSK (M-ary Frequency Shift Keying) signals on MIMO frequency selective channel. For demodulating MIMO MFSK signals, they...
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White Papers
The Impact of Antenna Directivity and Channel Bandwidth on the Power Spectral Density of Wideband and UWB MISO Channels
July 11, 2011, 12:00am PDT
The combination of MIMO with WideBand (WB) and Ultra-WideBand (UWB) systems imply many new effects, which make the conventional channel models developed for narrowband transmissions to be...
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White Papers
A Smart Predictive Link Layer Trigger Algorithm to Optimize Homogenous/Heterogeneous Networks WiFi Handover Decisions
July 11, 2011, 12:00am PDT
In traditional wireless networks, link layer metrics used to trigger handover are mainly signal quality based, such as Received Signal Strength (RSS). While signal quality is one major reason for...
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White Papers
Vertical Fast Handoff in Integrated WLAN and UMTS Networks
July 11, 2011, 12:00am PDT
Mobility management and on top of that, vertical handoffs remains as one of the most challenging obstacles in 4G evolution. In this paper, the authors present Vertical Fast Handoff protocol as a...
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White Papers
A Hop-Oriented Position Estimation Algorithm for Wireless Sensor Networks
July 11, 2011, 12:00am PDT
A wireless sensor network consists of a group of sensor nodes that broadcast the sensed data to the base station hop by hop via radio frequency. It is useful only if the sensed data are associated...
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White Papers
Exploiting Movement Synchronization to Increase End-to-End File Sharing Efficiency for Delay Sensitive Streams in Vehicular P2P Devices
July 11, 2011, 12:00am PDT
A significant aspect of wireless systems is the intermittent-connectivity experienced by nodes, where sudden network partitioning problems rarely allow a connected path between a source node and...
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White Papers
Investigation of the Correlation Effect on the Performance of V-BLAST and OSTBC MIMO Systems
July 11, 2011, 12:00am PDT
In this paper, the authors study the effect of the spatial correlation between multiple antennas on the performance of the MIMO systems in flat fading channels. As performances metrics, the Bit...
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White Papers
Simple Detection Schemes for the Alamouti Code Assisted V-BLAST (ACAV) System
July 11, 2011, 12:00am PDT
The Alamouti Code Assisted V-BLAST (ACAV) is a promising hybrid MIMO transmission scheme that is adopted by IEEE 802.11n-2009 (WiFi) recently. It combines Spatial Multiplexing (SM) and Alamouti...
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White Papers
Radiation Pattern Behaviour of Reconfigurable Asymmetry Slotted Ultra Wideband Antenna
July 11, 2011, 12:00am PDT
This paper presents the results of radiation pattern measurement of small reconfigurable slotted Ultra WideBand (UWB) antennas. The measurements were conducted by using RF measurement and...
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White Papers
Radio Resource Unit Allocation and Rate Adaptation in Filter Banks Multicarrier System
July 11, 2011, 12:00am PDT
In this paper, the effect of the effective channel gain and the SNR using the improved Joint Resource Unit (RU) Allocation and Bit loading (JRAB) on a Filter Banks MultiCarrier (FBMC) system are...
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White Papers
An Experimental Study of ICI Cancellation in OFDM Utilizing GNU Radio System
July 11, 2011, 12:00am PDT
Inter-Carrier-Interference (ICI) is an effect that noticeably degrades the quality of the Orthogonal Frequency Division Multiplexing (OFDM) signal. In this work, several proposed ICI cancellation...
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White Papers
Dynamic Group PCI Assignment Scheme
July 11, 2011, 12:00am PDT
The Physical Cell Identity (PCI) is used to identify femtocell in LTE femtocell as the physical layer identity. Due to the fact that the PCIs are normally allocated without planning; and the...
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White Papers
Performance Analysis of Pilot Patterns in Coded OFDMA Systems Over Multi-User Channels
July 11, 2011, 12:00am PDT
This paper presents a systematic approach for analyzing the bit error probability of a coded Orthogonal Frequency-Division Multiple Access (OFDMA) system in multiuser channels. A comparative...
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White Papers
A System Design for the Integration of RFID Systems With Wireless Network Technologies
July 11, 2011, 12:00am PDT
RFID (Radio Frequency IDentification) is a special type of wireless communication that allows automatic identification of objects without requiring a line-of-sight. It cannot provide the fullest...
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White Papers
The Selected Propagation Models Analysis of Usefulness in Container Terminal Environment
July 11, 2011, 12:00am PDT
It is particularly important to determine which propagation model is the most suitable for designing mobile radio systems in container terminal environment. The selected propagation models have...
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White Papers
Bandwidth Allocation Algorithms for VOIP Networks: An Experimentation System and Evaluation of Created Algorithm
July 11, 2011, 12:00am PDT
In this paper, the authors present how to allocate bandwidth in VoIP networks, how to set up a connection, and which links in the network should be used. Common are algorithms which find Shortest...
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White Papers
On the Receiver Performance in MU-MIMO Transmission in LTE
July 11, 2011, 12:00am PDT
MultiUser Multiple-Input Multiple-Output (MU-MIMO) transmission scheme has drawn most attentions during the recent development of Long Term Evolution (LTE) systems. Based on the feedback...
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White Papers
A Hybrid Solution For Coverage Enhancement in Directional Sensor Networks
July 11, 2011, 12:00am PDT
In Directional Sensor Networks (DSNs), motility capability of a directional sensor node has a considerable impact on the coverage enhancement. Motility capability may overcome overlapped field of...
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White Papers
Finite-State Markov Chain Approximation for Geometric Mean of MIMO Eigenmodes
July 11, 2011, 12:00am PDT
Time-varying nature of mobile fading channels can affect the design of wireless systems in many different aspects. This paper investigates the dynamic behavior of intrinsic spatial links in...
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White Papers
An Algorithmic Approach for Analyzing Wireless Networks With Retrials and Heterogeneous Servers
July 11, 2011, 12:00am PDT
Models with retrial phenomenon and heterogeneous servers arise in various wireless networks. This paper aims at presenting an approach for modeling and analyzing finite-source wireless networks...
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White Papers
Performance Analysis of an Ant-Based Routing Algorithm With Enhanced Path Maintenance for MANETs
July 11, 2011, 12:00am PDT
Ant-based routing algorithms belong to a class of ant colony optimization which applies the behavior of ants in nature to routing mechanism. Since, ant-based routing algorithms provide high...
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White Papers
Adaptive Cross Layer Approach for Video Transmission Over Cognitive UWB Network
July 11, 2011, 12:00am PDT
The demand of Quality of Service (QoS) for multimedia transmission over wireless network raises huge challenges such as time-varying channel conditions, limited resources, tight delay constraints,...
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White Papers
A Bidirectional Semi-Passive DS-CDMA-RFID Transponder for the UHF Band
July 11, 2011, 12:00am PDT
This paper presents a first realization of a semi-passive UHF RFID transponder featuring a direct sequence code division multiple access channel access method for the RFID up-link, and, in...
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White Papers
Efficient Symbol Detector for MIMO Communication Systems
July 11, 2011, 12:00am PDT
In this paper, an area-efficient symbol detector is proposed for Multiple-Input Multiple-Output (MIMO) communication systems with two transmit and two receive antennas. The proposed symbol...
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White Papers
Software Defined Radio as a DS-CDMA Receiver
July 11, 2011, 12:00am PDT
Programmable radio is one of the latest trends in the construction of multi-standard receivers. The technology, called Software Defined Radio (SDR), is also an ideal test platform that allows...
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White Papers
Performance Improvements of Mobile SCTP During Handover Period
July 11, 2011, 12:00am PDT
Handling mobility at the transport layer is an interesting approach to attain seamless handover in the context of heterogeneous access networks. To support terminal mobility, an extension of SCTP...
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White Papers
Sink-Connected Barrier Coverage Optimization for Wireless Sensor Networks
July 11, 2011, 12:00am PDT
This paper addresses the sink-connected barrier coverage optimization problem, which is concerned with how to select randomly deployed sensor nodes of a Wireless Sensor Network (WSN) to reach two...
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White Papers
The Joint Probability Density Function of the SSC Combiner Output Signal at Two Time Instants in the Presence of Hoyt Fading
July 11, 2011, 12:00am PDT
In this paper, the probability density function of the Switch and Stay Combiner (SSC) output Signal to Noise Ratio (SNR) at one time instant and the joint probability density function of the SSC...
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White Papers
Hybrid Log-MAP Algorithm for Turbo Decoding Over AWGN Channel
July 11, 2011, 12:00am PDT
In Log-MAP turbo decoding, the complicated log exponential sum is often simplified with the Jacobian logarithm which consists of the max operation along with an exponential correction function....
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White Papers
Evaluating Transceiver Power Savings Produced by Connectivity Strategies for Infrastructure Wireless Mesh Networks
July 11, 2011, 12:00am PDT
Infrastructure Wireless Mesh Networks (I-WMNs) are increasingly used to bridge the digital divide in rural areas around the world. Rural African areas in particular require energy efficient I-WMNs...
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White Papers
Spectrum Access During Cognitive Radio Mobiles' Handoff
July 11, 2011, 12:00am PDT
Cognitive radio is an emergent technology in wireless networks that aims to improve spectrum's use by allowing opportunist access. Recent research activities related to cognitive radio consider...
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Whitepapers
NAN Tools: An Open-Source Tool Suite for Interoperable Neutral Access Networks
June 19, 2012, 12:00am PDT
Although IP traffic has been growing exponentially for years and it is expected to keep following the same rate in the near future, current business models do not allow operators to benefit from...
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Whitepapers
Extending Neutrality to Experimental Facilities
June 19, 2012, 12:00am PDT
This paper focuses on the topic of Experimental Facilities, and introduces a novel approach which extends the neutrality concept that comes from Access Networks, to the facilities. The...
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Whitepapers
WTFC to TCP Flow Control Proxy
June 19, 2012, 12:00am PDT
Integration of different kinds of traffic on the Internet can be resolved by employing QoS policies on access networks. One possible solution is to use WTFC (Window-Time Flow Control) flow control...
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Whitepapers
Radio-Over-Fibre Transmission of Multiple Wireless Standards for Digital Cities: Exploiting the New Tramway Infrastructure
June 19, 2012, 12:00am PDT
The present paper aims at the specific application of Radio-over-Fibre to provide dedicated Wi-Fi access to tramway passengers. The challenge here is to provide wireless services in densely...
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Whitepapers
A Semantic-Oriented Framework for System Diagnosis
April 2, 2011, 12:00am PDT
In the field of system and network diagnosis, there is a variety of modeling and inference methods reported in literature. However, very few are focusing on the validation and knowledge transfer...
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Whitepapers
An Improved Multi-Band Speech Enhancement Method for Colored Noise Estimation and Reduction
April 2, 2011, 12:00am PDT
There are many situations where speech is affected by different kind of acoustic noise. The authors propose an improved spectral subtraction method for the reduction of colored acoustic noise...
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Whitepapers
A Media Delivery Framework for on Demand Learning in Manufacturing Processes
April 2, 2011, 12:00am PDT
This paper presents a streaming-based E-Learning environment where closer integration between learning and work is achieved by integrating multimedia services into manufacturing processes. It...
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Whitepapers
Software Defined Radio Certification in Europe: Challenges and Processes
April 2, 2011, 12:00am PDT
Standardization and certification of Software Defined Radio technologies are closely related. This paper describes the current standardization efforts for Software Defined Radio technologies in...
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Whitepapers
Advanced Consideration of a Caller Pre-Validation Against Direct Spam Over Internet Telephony
April 2, 2011, 12:00am PDT
Spam over Internet Telephony as the distribution of unwanted voice messages over Voice over Internet Protocol networks is an upcoming threat. It is harder to prevent than e-mail spam since its...
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Whitepapers
Evaluation of Spectrum Occupancy in an Urban Environment in a Cognitive Radio Context
April 2, 2011, 12:00am PDT
Lack of frequency spectrum is becoming one of the major problems in the telecommunication field with the introduction of several new radio communication technologies. Cognitive Radio (CR)...
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Whitepapers
Secure Video for Android Devices
April 2, 2011, 12:00am PDT
Android is rapidly gaining market share among smart phones with high-speed next-generation Internet connectivity. A whole new generation of users is consuming rich content that requires high...
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Whitepapers
User Equipment Energy Efficiency Versus LTE Network Performance
April 2, 2011, 12:00am PDT
The purpose of this paper is to analyze the tradeoff conditions between battery saving opportunities at the user terminal and Long Term Evolution network performance. To achieve the goal Voice...
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Whitepapers
Improving IPTV QoE Taking the Suitable MPEG-2/MPEG-4 Quantizer Based on Jitter, Delay and Lost Packets Measurements
April 2, 2011, 12:00am PDT
MPEG-2 and MPEG-4 encoding are standards that are widely used by the digital television industry. Although, nowadays, MPEG-2 is the most used, MPEG-4 is gaining ground because it provides good...
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Whitepapers
CARMA: A Distance Estimation Method for Internet Nodes and Its Usage in P2P Networks
April 2, 2011, 12:00am PDT
Topological distance estimation is the key to the efficiency in distributed systems and peer-to-peer networks. Contrary to many existing or proposed methods, which usually require the exchange of...
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Whitepapers
Transformation of Any Adding Signal Technique in Tone Reservation Technique for PAPR Mitigation Thanks to Frequency Domain Filtering
September 15, 2011, 12:00am PDT
Orthogonal Frequency Division Multiplexing (OFDM) suffers from a high Peak-to-Average Power Ratio (PAPR). Tone Reservation (TR) is a popular PAPR reduction technique that uses a set of reserved...
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Whitepapers
System Level Simulation of E-MBMS Transmissions in LTE-A
September 15, 2011, 12:00am PDT
Interference coordination methods for Evolved-Multimedia Broadcast/Multicast Service (E-MBMS) in Long-Term Evolution Advanced (LTE-A) are presented. In this paper, OFDM/OFDMA signals based on LTE...
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Whitepapers
Extended Mobile WiMAX Signal Transmission Over RoF Via Triple Symmetrical Dispersion System SMF, DCF and CFBG
September 15, 2011, 12:00am PDT
The main impediments for long distance signal transmission in the fibre optic system, especially the Radio over Fibre (RoF) system, are the chromatic dispersion and signal power attenuation....
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Whitepapers
Field Tests and Comparison of the Channel Properties for the DRM+ System in the VHF-Bands II (87.5 MHz-108.0 MHz) and III (174-230 MHz)
September 15, 2011, 12:00am PDT
This paper presents a comparison of the channel properties for the DRM+ (Digital Radio Mondiale, Mode E) radio system in the frequency Bands II and III for mobile reception. The impact of...
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Whitepapers
Pilot Pattern Design for PUSC MIMO WiMAX-Like Filter Banks Multicarrier System
September 15, 2011, 12:00am PDT
In this paper, the authors analyze different designed pilot patterns adapted to the DL-PUSC pilot grid for Filter Banks Multi-Carrier (FBMC) system. Different scheme have been proposed (pair of...
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Whitepapers
CDMA-Based UHF-RFID System With Semi-Passive UHF Transponders
September 15, 2011, 12:00am PDT
RFID systems, in general, increase the efficiency of logistic systems, e.g., inventory of stocks. Unfortunately, present existing systems come fast to their limits if a certain number of RFID...
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Whitepapers
Performance Model for Orthogonal Sub Channel in Noise-Limited Environment
September 15, 2011, 12:00am PDT
OSC (Orthogonal Sub Channel) is an enhancement for the GSM voice service. It provides up to double capacity in the radio interface with the same hardware compared to the GSM Half Rate (HR) mode....
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Whitepapers
The Outage Probability of the Satellite Telecommunication System in the Presence of Fading With Switch and Stay Combining on Satellite and Earth Station
September 15, 2011, 12:00am PDT
In this paper, the satellite communication system consisting of the earth transmitting station and the satellite transponder was considered. Switch and Stay Combining (SSC) diversity technics are...
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Whitepapers
Multicast TV Channels Over Wireless Neutral Access Networks: Proof of Concept and Implementation
September 15, 2011, 12:00am PDT
IP traffic trends and forecasts suggest that TeleVision over IP (IPTV) will be the killer application for Next-Generation Networks (NGNs). There is, however, a chicken and egg situation between...
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Whitepapers
SIP Server Implementation and Performance on a Bare PC
September 15, 2011, 12:00am PDT
The authors describe the implementation and performance of a bare PC SIP server that runs without the support of an Operating System (OS) or kernel. A bare PC SIP server provides immunity against...
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Whitepapers
Managing Quality of Experience on a Commercial Mobile TV Platform
September 15, 2011, 12:00am PDT
The user perceived quality or Quality of Experience (QoE) is of significant importance to multimedia service providers because of its relevance for efficient management of provided services....
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Whitepapers
UAV-Based Sensor Networks for the Future Battlefield Warriors
September 15, 2011, 12:00am PDT
This paper presents a new networking concept for sensor networks, the Wireless Polling Sensor Network (WPSN) for the Dismounted Future Warrior. The WPSN comprises a small ad hoc network of mobile...
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Whitepapers
Multiwavelets in the Context of Hierarchical Stereo Correspondence Matching Techniques
September 15, 2011, 12:00am PDT
This paper presents an evaluation of different types and families of multiwavelets in stereo correspondence matching. First, the paper introduces two hierarchical stereo matching techniques based...
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Whitepapers
Signal Detection for 3GPP LTE Downlink: Algorithm and Implementation
September 15, 2011, 12:00am PDT
In this paper, the authors investigate an efficient signal detection algorithm, which combines Lattice Reduction (LR) and List Decoding (LD) techniques for the 3rd generation Long Term Evolution...
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Whitepapers
Analytical Evaluation of the Role of Estimation and Quantization Errors in Downstream Vectored VDSL Systems
September 15, 2011, 12:00am PDT
The authors investigate the effect of non idealities in the diagonalizing precoder vectoring technique used for cancellation of the far-end crosstalk in downstream VDSL networks. By using...
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Whitepapers
Capacity Analysis and Simulation of 3-D Space-Time Correlated HAP-MIMO Channels
September 15, 2011, 12:00am PDT
High-Altitude Platforms (HAPs) are one of the most promising alternative infrastructures for realizing next generation mobile communications networks. This paper utilizes a recently proposed...
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Whitepapers
A Comparison of the Performance of Prediction Techniques in Curtailing Uplink Transmission and Energy Requirements in Mobile Free-Viewpoint Video Applications
September 15, 2011, 12:00am PDT
The rapid deployment of multimedia services on mobile networks together with the increase in consumer demand for immersive entertainment have paved the way for innovative video representations....
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Whitepapers
A Didactic Platform for Practical Study of Real Time Embedded Operating Systems
April 30, 2012, 12:00am PDT
The paper proposes a new didactic platform for practical study of embedded Real Time Operating Systems (RTOSs). Three fundamental parts that are included in the platform are discussed in detail:...
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Whitepapers
Media Connectivity in SIP Infrastructures: Provider Awareness, Approaches, Consequences, and Applicability
April 30, 2012, 12:00am PDT
In SIP-based Voice over IP infrastructures, media data is usually exchanged directly between the endpoints using RTP without provider interaction. In contrast to the Public Switched Telephone...
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Whitepapers
Towards Efficient Energy Management: Defining HEMS and Smart Grid Objectives
April 30, 2012, 12:00am PDT
Energy consumption has increased considerably in the last years. The way to reduce and make energy consumption more efficient has become of great interest for researchers. One of the research...
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Whitepapers
Towards Statistical Analysis of the Impact of Playout Buffer on Quality of Experience in VoIP Applications
April 30, 2012, 12:00am PDT
The speech quality of Voice over IP (VoIP) applications can be assessed subjectively as Quality of Experience (QoE) and objectively as Quality of Service (QoS). QoE is multifaceted, which ties...
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Whitepapers
System Architecture for High-Speed Close-Proximity Low-Power RF Memory Tags and Wireless Internet Access
April 30, 2012, 12:00am PDT
The authors have developed an open architecture platform for implementing passive Radio-Frequency IDentification (RFID) tags with a mass memory for close proximity environment. Purposes for such...
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Whitepapers
Effect of Global and Local Brightness on Quality of 3D and 2D Visual Perception
July 12, 2012, 12:00am PDT
There are several different factors that affect the perceived quality of 3D content. The authors' objective in this paper is to investigate how the global and local change of brightness in a scene...
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Whitepapers
Radiation Pattern Characteristics of Multiple Band-Notched Ultra Wideband Antenna With Asymmetry Slot Reconfiguration
July 12, 2012, 12:00am PDT
Radiation pattern characteristics of reconfigurable asymmetry slotted ultra wideband antenna with multiple band-notched are presented. The proposed antenna is planar monopole, consisting of a...
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Whitepapers
Impact of Scrambling-Exact Channel Estimation on HSDPA MIMO
July 12, 2012, 12:00am PDT
Multiple-Input Multiple-Output (MIMO) antenna systems require a separate pilot signal for each transmitting antenna for enabling the receiver to measure all physical channels separately. As...
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Whitepapers
Exploiting Model Variability in ABS to Verify Distributed Algorithms
July 12, 2012, 12:00am PDT
The authors show a way to evaluate functional properties of distributed algorithms by the example of the AODV algorithm in sensor networks, Creol and ABS models, and component testing. They...
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