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(231 results)Search the Library
Mission Statement
TechRepublic's ITPapers is the Web's largest library of free technical IT white papers, webcasts, and case studies. Covering IT categories including Data Management, IT Management, Networking, Communications, Enterprise Applications, Storage, Security and much more, TechRepublic's White Paper Directory is the best source for technical white papers and IT information.
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White Papers
Efficient Proving for Practical Distributed Access-Control Systems
Jul 2009
The authors present a new technique for generating a formal proof that an access request satisfies access-control policy, for use in logic-based access-control frameworks. The approach is tailored...
Provided by Carnegie Mellon University
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White Papers
Camera Handoff With Adaptive Resource Management for Multi-Camera Multi-Target Surveillance
Apr 2008
Camera handoff is a crucial step to generate a continuously tracked and consistently labeled trajectory of the object of interest in multi-camera surveillance systems. Most existing camera handoff...
Provided by Institute of Electrical and Electronics Engineers
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Case Studies
A Leading Telecom Equipment Company Relies on TCS to Support Its Legacy Network and Service Management Systems
Mar 2011
TCS' client, a leading supplier of high-tech equipment for telecommunications networks, turned to TCS for support in managing its legacy network and service management systems. Over the past...
Provided by Tata Consultancy Services
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White Papers
Autonomus Reconfiguration Using FPAA for Bandwitdh Recovery in Satellite Subsystems
Jul 2008
In recent years, satellite communication has gained increased prominence and driving factors are the reliability, new design techniques and reduced cost. The onboard control system components of...
Provided by Vinayaka Mission University
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White Papers
Discovering Structural Patterns in Telecommunications Data
Jan 2011
With the increasing amount and complexity of data being collected, there is an urgent need to create automated techniques for mining the data. In particular, data being generated and stored by...
Provided by American Association for Artificial Intelligence
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White Papers
Use of Geographical Information System (GIS) in Developing an Intelligent Transport System (ITS)
Apr 2008
The purpose of this paper is to explore the possibilities of developing an Intelligent Transport System using the resources of Geographical Information System and Spatial Information System....
Provided by Chittagong University of Engineering & Technology
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Podcasts
TechEd 2011 Birds-of-a-Feather (Session 12): Exchange Unified Messaging
May 2011
UM is a role often left out of the discussion, and when the hard questions do come up, engineers and consultants are often less prepared to answer them compared to other topics such as storage....
Provided by Microsoft
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White Papers
On-Line Estimation of the QoE of Progressive Download Services in Multimedia Access Networks
May 2008
Current broadband access networks are evolving towards an infrastructure for multimedia services such as BroadcastTV, Voice over IP and Video on Demand. As these multimedia services have high...
Provided by Ghent University
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Whitepapers
Online Tracking: Questioning the Power of Informed Consent
Aug 2012
The paper aims to report the main findings of a paper for the Dutch Regulatory authority for the telecommunications sector OPTA to explore how the new European ''Cookie rules'' in the e-privacy...
Provided by University of Almeria
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Podcasts
Defining IMS
Jan 2011
The speaker explores the IP Multimedia Subsystem, or IMS. He explains that IMS is set to become the framework that Internet Service Providers will use to deliver new, highly customizable services,...
Provided by F5 Networks
-
Whitepapers
Capacity of General Discrete Noiseless Channels
Jun 2010
This paper concerns the capacity of the discrete noiseless channel introduced by Shannon. A sufficient condition is given for the capacity to be well-defined. For a general discrete noiseless...
Provided by RWSoftware
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Whitepapers
A Case Study on Satellite Image Fusion Techniques
Jun 2012
Many image fusion algorithms and software tools have been developed for combining images of different spectral and spatial resolution. The resultant color image is of high resolution and is used...
Provided by Maxwell Science Publication
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Whitepapers
Operating LDPC Codes With Zero Shaping Gap
Sep 2011
Unequal transition probabilities between input and output symbols, input power constraints, or input symbols of unequal durations can lead to non-uniform capacity achieving input distributions for...
Provided by RWSoftware
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Whitepapers
The Handover in the Constellations of Satellites in Low Orbit
Apr 2012
The Handover is one of the key subjects in maintaining the quality of service offered by non-geostationary constellation systems. As the satellite coverage moves according to the satellite motion,...
Provided by Science and Development Network (SciDev.Net)
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Whitepapers
Exploiting Polarization for Spectrum Sensing in Cognitive SatComs
Jun 2012
Exploring new techniques for Spectrum Sensing (SS), which can detect the weak primary signals instantly, has been an important research challenge. In this paper, the problem of enhancing SS...
Provided by ICST
-
Whitepapers
Genetic Diversity and Population Structure: Implications for Conservation of Wild Soybean (Glycine Soja Sieb. et Zucc) Based on Nuclear and Chloroplast Microsatellite Variation
Oct 2012
Wild soybean (Glycine soja Sieb. et Zucc) is the most important germplasm resource for soybean breeding, and is currently subject to habitat loss, fragmentation and population decline. In order to...
Provided by Chinese Academy of Sciences
-
Whitepapers
Monte Carlo Based Non-Linear Mixture Model of Earth Observation Satellite Imagery Pixel Data
Aug 2012
Monte Carlo based non-linear mixel (mixed pixel) model of visible to near infrared radiometer of earth observation satellite imagery is proposed. Through comparative studies with actual real earth...
Provided by The Schwa
-
Whitepapers
2D Satellite Image Registration Using Transform Based and Correlation Based Methods
Jun 2012
Image registration is the process of geometrically aligning one image to another image of the same scene taken from different viewpoints or by different sensors. It is a fundamental image...
Provided by The Schwa
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Whitepapers
Countermeasure for Round Trip Delay Which Occurs in Between Satellite and Ground With Software Network Accelerator
Jun 2012
Countermeasure for round trip delay which occurs in between satellite and ground with network accelerator is investigated together with operating system dependency on effectiveness of accelerator....
Provided by The Schwa
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Whitepapers
HDL Implementation of Low Density Parity Check (LDPC) Decoder
Aug 2012
Low-Density Parity-Check (LDPC) codes are one of the most promising error-correcting codes approaching Shannon capacity and have been adopted in many applications. These codes offer huge...
Provided by International Journal of Electronics and Computer Science Engineering
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Whitepapers
Distributed Joint Source and Channel Code With Correlated Information Sources
Aug 2012
In this paper, a new Distributed Joint Source-Channel Code (DJSCC) is proposed for a communication network with multiple correlated information sources. The DJSCC is performed by puncturing the...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
The Perceptual Objective Listening Quality Assessment Algorithm in Telecommunication
Aug 2012
In order to accomplish speech quality evaluation tasks in an efficient and economical way, objective computational models which simulate human hearing characteristics of speech perception have...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Performance Evaluation and Analysis of Bundle Protocol in Cislunar Communications
Aug 2012
The Bundle Protocol (BP) is developed to solve the new problems in deep space exploration. To date, little work has been done in evaluating the performance of BP applied to an interplanetary...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Two-Step Construction Method of Protograph-Based AR4JA Codes in Deep Space Communication
Aug 2012
This paper discusses the construction of the Accumulate-Repeat-4-Jagged-Accumulate(AR4JA) codes which is suitable for the deep-space communication based on the protograph. Two-step construction...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Wideband Space Time Statistical Model for Characterization of Satellite Communication Channel in Dense Multipath Environment
Mar 2010
This paper proposes a space-time statistical geometric model for characterization of multipath propagation of the satellite communication, which provides some insight into the spatial properties...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Half-Duplex Relaying With Serially-Concatenated Low-Density Generator Matrix (SCLDGM) Codes
Mar 2010
Recently, the integration of cooperation with coding has proven to be a very useful technique to enhance relay system performance. Relay systems based on Low-Density Parity Check (LDPC) codes have...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Power Efficient Partial Repeated Cooperation Scheme With Regular LDPC Code
Mar 2010
The partially repeated cooperation system employing Low Density Parity-Check (LDPC) codes achieves space diversity and extra coding gain at the same time. This paper focuses on the power...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Selective-Update Decoding of Non-Binary LDPC Codes
Mar 2010
Non-binary LDPC codes are promising error correcting techniques with very good performance, especially for high order fields. Using higher order fields enhances performance but, at the same time,...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Differential Encoding for Quadrature-Amplitude Modulation
Mar 2010
In this paper, the authors propose a novel differential encoder for QAM (Quadrature-Amplitude Modulation), by a look-up table instead of a rule. Using a table for differential encoding has the...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Reference Phasor Based Log-Likelihood Ratios for Pilot-Symbol-Assisted BPSK Transmission of LDPC Codes Over the Noncoherent Channel
Mar 2010
The authors derive the log-likelihood ratio for iterative decoding of low-density parity-check codes transmitted using Binary Phase-Shift-Keying (BPSK) with pilot-symbol-assisted modulation. This...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
On the Performance Evaluation of Quasi-Cyclic LDPC Codes With Arbitrary Puncturing
Mar 2010
A novel algorithm, named Improved Protograph-based EXtrinsic Information Transfer (IP-EXIT), is proposed in this paper. With the proposed algorithm, quite accurate performance evaluations of...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
The Undisputed Guide to Telecom Management Bliss
Nov 2012
This paper explains the five key steps to converting to the vCom service and one final destination - telecom management bliss. The steps are: meet the team, inventory analysis, convert the...
Provided by vCom solutions
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Whitepapers
Protograph EXIT Analysis Over Block Fading Channels With Application to Relays
May 2012
An accurate EXtrinsic Information Transfer (EXIT) analysis is developed for protograph Low-Density Parity-Check (LDPC) codes over the Block Fading Channel (BFC). The analysis is thus exploited for...
Provided by University of Bochum
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Whitepapers
Azimuth-Dependent Spatialization for a Teleconference Audio Display
Dec 2010
This paper proposes a novel scheme for the spatial rendition of audio in a teleconferencing situation. Several researchers have examined and established that there is a substantial improvement in...
Provided by Indian Institute of Technology Bombay
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Whitepapers
A Two-Stage Algorithm to Reduce Encoding Delay of Turbo Source Coding
Aug 2008
Lossless turbo source coding employs an iterative encoding algorithm to search for the smallest codeword length that guarantees zero distortion. Although such encoder achieves promising...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Novel Algebraic Constructions of Nonbinary Structured LDPC Codes Over Finite Fields
Aug 2008
In this paper, the authors present three algebraic methods for constructing structured non-binary LDPC codes over finite fields, among which the first method is based on the multiplicative...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Security White Paper
Mar 2009
The network world today can be a dangerous place. Network administrators need to worry about viruses, spybots and denial of service attacks, to name a few. In addition, a company needs to maintain...
Provided by TowersPerrin
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Whitepapers
Alternatives for Powering Telecommunications Base Stations
Dec 2008
The last decade has seen exponential growth in wireless communication. The growth of mobile networks coupled with intense competition has sharpened operators' focus on deployment logistics,...
Provided by Motorola
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Whitepapers
Design of a Software Radio Prototype for the Analysis of Beamformers in Satellite Communications
Aug 2007
Earth stations for downloading data from LEO satellites use large reflector antennas (usually, with diameters over 12 m for telemetry links). These antennas pose a number of impairments regarding...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A New Generation of Gallium Nitride (GaN) Based Solid State Power Amplifiers for Satellite Communication
Aug 2012
The introduction of Gallium Nitride High Electron Mobility Transistors (GaNHEMT) in early 2000 has left an undeniable mark on the entire satellite communication landscape. It is now possible for...
Provided by Advantech
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Whitepapers
Recent Improvements in Satellite Networks for Search and Rescue: MEOSAR
Jul 2008
The terms uninterrupted communication and communication technologies remind one about the satellite network technologies. By focusing on the satellite technology-based fields and corresponding...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Low-Complexity LDPC Codes With Near-Optimum Performance Over the BEC
Jul 2008
Recent works showed how Low-Density Parity-Check (LDPC) erasure correcting codes, under Maximum Likelihood (ML) decoding, are capable of tightly approaching the performance of an ideal...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
GNSS Receiver Reference Design
Jul 2008
Satellite based navigation is a rapidly growing application of satellite systems. The research of the topic is lacking "Open source" hardware receivers. The group's purpose is to provide one. In...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
SOFTREC G3, Software Receiver and Signal Analysis for GNSS Bands
Jul 2008
In this paper, the concept of SDR, its use in modern GNSS, existing applications, and future developments are briefly reviewed. In particular, the focus is over the presentation of two...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Convolutional Codes for Iterative Decoding
Jul 2008
This paper gives an overview of three different classes of convolutional codes that are suitable for iterative decoding. The authors are characterized by the type of component codes that are used...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Optimization of Group Layered Multi-Antenna Architectures With LDPC Codes
Mar 2009
Group Layered multi-antenna Architectures (GLAs) employing orthogonal space-time block codes and spatial multiplexing techniques may simultaneously exploit diversity and multiplexing gains with...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Improved Decoding of Binary and Non-Binary LDPC Codes by Probabilistic Shuffled Belief Propagation
Apr 2011
Low-Density Parity-Check (LDPC) codes have proved to be very powerful channel coding schemes with a broad range of applications. However, as maximum-likelihood decoding is utterly complex,...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Multiple Phased-Burst Correcting Superposition Product LDPC Codes
Apr 2011
In this paper, a class of product codes based on Low-Density Parity Check (LDPC) constituent codes are constructed for Multiple Phased-Burst Erasure Correction (MPBEC). These codes are shown to...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Iterative Decoding of LDPC-Coded BDPSK With New LLR Metric Over the Noncoherent Channel
Apr 2011
The authors propose an iterative decoding scheme for low density parity check codes concatenated with Binary Differential Phase Shift Keying (BDPSK) in additive white Gaussian channels with...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Analysis of Error Floors of Non-Binary LDPC Codes Over MBIOS Channel
Apr 2011
In this paper, the authors investigate the error floors of non-binary Low-Density Parity-Check (LDPC) codes transmitted over the Memory-less Binary-Input Output-Symmetric (MBIOS) channels. They...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Partially Quasi-Cyclic Protograph-Based LDPC Codes
Apr 2011
A significant amount of the analysis of protograph-based Low-Density Parity-Check (LDPC) codes has been devoted to the subclass of Quasi-Cyclic (QC) LDPC codes. Despite their implementation...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Comparison of the Detrimental Effects of Trapping Sets in LDPC Codes
Apr 2011
This paper presents a method to compare the detrimental effect of different trapping sets in the LDPC codes for an AWGN channel. The messages from the check nodes in the trapping set induced...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Controlling LDPC Absorbing Sets Via the Null Space of the Cycle Consistency Matrix
Apr 2011
This paper focuses on controlling absorbing sets for a class of regular LDPC codes, known as Separable, Circulant-Based (SCB) codes. For a specified circulant matrix, SCB codes all share a common...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Design of Circular Orbit Satellite Link for Maximum Data Transfer
Apr 2011
The paper provides an analytical expression for the amount of theoretically transmittable data to/from a Low Earth Orbit (LEO) or Medium Earth Orbit (MEO) satellite and a fixed ground station,...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Performance Enhancements for Asynchronous Random Access Protocols Over Satellite
Apr 2011
In this paper, a novel enhancement of the well known ALOHA random access mechanism is presented which largely extends the achievable throughput compared to traditional ALOHA and provides...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Vehicle Detection Approach From Satellite Imagery Using Antibody Networks
Feb 2009
This paper presents a novel vehicle detection approach based on artificial immune principle. The approach is to build an artificial immune system for vehicle detection from high resolution...
Provided by Wuhan University
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Whitepapers
Orbit Determination Accuracy Improvement for Geostationary Satellite With Single Station Antenna Tracking Data
Dec 2008
An operational Orbit Determination (OD) and prediction system for the geostationary Communication, Ocean, and Meteorological Satellite (COMS) mission requires accurate satellite positioning...
Provided by Electronics and Telecommunication Research Institute
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Whitepapers
Iterative Decoding for Low-Density Parity-Check Lattices
Feb 2008
High-dimensional lattice codes can provide relatively large coding gains and the gain increases with dimension. However, the authors are difficult to implement in practice due to the decoding...
Provided by Korea Advanced Institute of Science and Technology
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Whitepapers
Future Automotive Insurance System Based on Telematics Technology
Feb 2008
With the proliferation of vehicles and advancement of Information Technology, the technology of Telematics, which provides valuable services to people by collecting and analyzing the information...
Provided by Electronics and Telecommunication Research Institute
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Whitepapers
Optimal Buffer Allocation in Tandem Queues With Communication Blocking
Feb 2009
In this paper, the authors consider an m-node tandem queue (queues in series) with a Poisson arrival process and either deterministic or non-overlapping service times. With the assumption that...
Provided by Electronics and Telecommunication Research Institute
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Whitepapers
Polarization-Diversity Cross-Shaped Patch Antenna for Satellite-DMB Systems
Apr 2010
A small reconfigurable patch antenna is proposed to achieve polarization diversity for digital multimedia broadcasting systems at 2.6 GHz. To obtain polarization diversity, a pair of on-slit PIN...
Provided by Electronics and Telecommunication Research Institute
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Whitepapers
Long Length LDPC Code Construction and the Corresponding Decoder Implementation With Adjustable Parallelism
Apr 2008
In this paper, the authors propose a class of implementation friendly structured LDPC codes with low error floors. The proposed codes exhibit no apparent error floors as compared with Quasi-Cyclic...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A New Approach for the Construction of Powerful LDPC Convolutional Codes
Apr 2008
A novel approach for the algebraic construction of Low-Density Parity-Check (LDPC) convolutional codes is presented. It is based on the orthogonality structures of the codes. The proposed code...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
New Correlation Functions for CBOC Satellite Signal Synchronization
Feb 2008
Binary Offset Carrier (BOC) signal synchronization is based on the correlation between the received and locally generated BOC signals. Thus, the multiple side-peaks in BOC autocorrelation are one...
Provided by Sungkyunkwan University
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Whitepapers
Call/Messaging Open API for Telecommunication Services
Feb 2008
With the saturation of existing intelligent network services, it is becoming increasingly difficult to develop new profitable services. The current trend seems to be moving toward the convergence...
Provided by KT
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Whitepapers
DAVINCI Non-Binary LDPC Codes: Performance and Complexity Assessment
Mar 2010
Non-Binary Low Density Parity Check (NB-LDPC) codes are expected to reduce the performance gap between binary LDPC and Turbo Codes for both short and medium length codewords, retaining in both...
Provided by Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
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Whitepapers
First-Order Elastic Nonlinearities of Bulk Acoustic Wave Resonators
Jan 2011
The authors propose a procedure to characterize the intrinsic nonlinearities of bulk acoustic wave resonators by performing one-port measurements of the second harmonic and second-order...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Eigenbeamforming for Interference Mitigation in GNSS Receivers
May 2011
This paper presents a novel beamforming approach for interference mitigation in Global Navigation Satellite Systems (GNSS) receivers. The proposed algorithm is based on a recently developed...
Provided by Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
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White Papers
The Local Circle Removal Algorithm for the LDPC Code in Communications
May 2012
The LDPC code, whose check matrix H is sparse, is widely utilized in the current communication systems due to its good performance that is near the Shannon limit. The girth length, which is the...
Provided by AICIT
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White Papers
Integrate Research on Fuzzy Comprehensive Evaluation of the Satellite Engineering Project
May 2012
Risk management of satellite engineering project is a very complex job, and risk evaluation is one of the most important links. By predicting and classifying risk sources of a satellite...
Provided by AICIT
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White Papers
Research on Satellite Autonomous Orbit Determination Method Based on the Unscented Particle Filter with Embedded Earth Sensor Correction
May 2012
The direct earth horizon and starlight observation with earth sensor and star sensor is often used in the satellite autonomous orbit determination, which is a stable autonomous navigation method...
Provided by AICIT
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White Papers
A Cross-Layer Rate Control Mechanism for Link-Adaptive Satellite Integrated Services
Oct 2007
This paper presents a mechanism for dynamic rate control of satellite integrated services, based on a cross-layer approach, utilising link quality feedback from the satellite terminals. The...
Provided by Hindawi Publishing
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White Papers
Towards Semantic Interoperability of Graphical Domain Specific Modeling Languages for Telecommunications Service Design
Jul 2011
High competition pressures Telecommunications service providers to reduce their concept-to-market time. To manage more easily service complexity among several actors in the design process and to...
Provided by IARIA
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White Papers
Modeling Unified Interaction for Communication Service Integration
Jul 2011
Social network inspired communication services has made tremendous success, allowing users to communicate and share user generated contents in an efficient way. At the same time, Telecom services...
Provided by IARIA
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White Papers
Performance Modeling of Database Servers in a Telecommunication Service Management System
Apr 2012
Resource optimization mechanisms, as admission control and traffic management, require accurate performance models that capture the dynamics of the system during high loads. The main objective of...
Provided by IARIA
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White Papers
Real Time Telecom Revenue Assurance
Apr 2012
Telecommunication industry has seen phenomenal growth and intense competition in recent times. Basic connectivity has been commoditized and service providers need to provide personalized and...
Provided by IARIA
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White Papers
A Queuing Model for Congestion Control and Reliable Data Transfer in Cable Access Networks
Jul 2011
A set of simple queuing theory models which can model the average response of a network of computers to a given traffic load has been implemented. The impact of variations in traffic patterns and...
Provided by International Journal of Computer Science and Information Technologies
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White Papers
Design and Simulation of a Reduced - Size VSAT Antenna With Appreciable Gain
Dec 2011
Information technology has become a very vital tool in the world today. There exist the need for the flow of information between arms of an organization such as banks, hospitals, business sectors...
Provided by ARPN Journal of Systems and Software
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White Papers
Evaluation of Power Line Communication Equipment in Home Networks
Sep 2009
In this paper, the authors examine the performance of power line communication equipments (ethernet -to-powerline adapters) that come from different vendors and are based on different technologies...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Nonlinear Equalization With Known Channel State Information in Satellite Communication
Nov 2008
Three nonlinear equalization algorithms are discussed for the case that training sequence is not available but Channel State Information (CSI) is known. The first algorithm is based on the...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Camera Handoff With Adaptive Resource Management for Multi-Camera Multi-Target Surveillance
Apr 2008
Camera handoff is a crucial step to generate a continuously tracked and consistently labeled trajectory of the object of interest in multi-camera surveillance systems. Most existing camera handoff...
Provided by Institute of Electrical and Electronics Engineers
-
Case Studies
A Leading Telecom Equipment Company Relies on TCS to Support Its Legacy Network and Service Management Systems
Mar 2011
TCS' client, a leading supplier of high-tech equipment for telecommunications networks, turned to TCS for support in managing its legacy network and service management systems. Over the past...
Provided by Tata Consultancy Services
-
White Papers
Autonomus Reconfiguration Using FPAA for Bandwitdh Recovery in Satellite Subsystems
Jul 2008
In recent years, satellite communication has gained increased prominence and driving factors are the reliability, new design techniques and reduced cost. The onboard control system components of...
Provided by Vinayaka Mission University
-
White Papers
Discovering Structural Patterns in Telecommunications Data
Jan 2011
With the increasing amount and complexity of data being collected, there is an urgent need to create automated techniques for mining the data. In particular, data being generated and stored by...
Provided by American Association for Artificial Intelligence
-
White Papers
Use of Geographical Information System (GIS) in Developing an Intelligent Transport System (ITS)
Apr 2008
The purpose of this paper is to explore the possibilities of developing an Intelligent Transport System using the resources of Geographical Information System and Spatial Information System....
Provided by Chittagong University of Engineering & Technology
-
Podcasts
TechEd 2011 Birds-of-a-Feather (Session 12): Exchange Unified Messaging
May 2011
UM is a role often left out of the discussion, and when the hard questions do come up, engineers and consultants are often less prepared to answer them compared to other topics such as storage....
Provided by Microsoft
-
White Papers
On-Line Estimation of the QoE of Progressive Download Services in Multimedia Access Networks
May 2008
Current broadband access networks are evolving towards an infrastructure for multimedia services such as BroadcastTV, Voice over IP and Video on Demand. As these multimedia services have high...
Provided by Ghent University
-
Whitepapers
Online Tracking: Questioning the Power of Informed Consent
Aug 2012
The paper aims to report the main findings of a paper for the Dutch Regulatory authority for the telecommunications sector OPTA to explore how the new European ''Cookie rules'' in the e-privacy...
Provided by University of Almeria
-
Podcasts
Defining IMS
Jan 2011
The speaker explores the IP Multimedia Subsystem, or IMS. He explains that IMS is set to become the framework that Internet Service Providers will use to deliver new, highly customizable services,...
Provided by F5 Networks
-
Whitepapers
Capacity of General Discrete Noiseless Channels
Jun 2010
This paper concerns the capacity of the discrete noiseless channel introduced by Shannon. A sufficient condition is given for the capacity to be well-defined. For a general discrete noiseless...
Provided by RWSoftware
-
Whitepapers
A Case Study on Satellite Image Fusion Techniques
Jun 2012
Many image fusion algorithms and software tools have been developed for combining images of different spectral and spatial resolution. The resultant color image is of high resolution and is used...
Provided by Maxwell Science Publication
-
Whitepapers
Operating LDPC Codes With Zero Shaping Gap
Sep 2011
Unequal transition probabilities between input and output symbols, input power constraints, or input symbols of unequal durations can lead to non-uniform capacity achieving input distributions for...
Provided by RWSoftware
-
Whitepapers
The Handover in the Constellations of Satellites in Low Orbit
Apr 2012
The Handover is one of the key subjects in maintaining the quality of service offered by non-geostationary constellation systems. As the satellite coverage moves according to the satellite motion,...
Provided by Science and Development Network (SciDev.Net)
-
Whitepapers
Exploiting Polarization for Spectrum Sensing in Cognitive SatComs
Jun 2012
Exploring new techniques for Spectrum Sensing (SS), which can detect the weak primary signals instantly, has been an important research challenge. In this paper, the problem of enhancing SS...
Provided by ICST
-
Whitepapers
Genetic Diversity and Population Structure: Implications for Conservation of Wild Soybean (Glycine Soja Sieb. et Zucc) Based on Nuclear and Chloroplast Microsatellite Variation
Oct 2012
Wild soybean (Glycine soja Sieb. et Zucc) is the most important germplasm resource for soybean breeding, and is currently subject to habitat loss, fragmentation and population decline. In order to...
Provided by Chinese Academy of Sciences
-
Whitepapers
Monte Carlo Based Non-Linear Mixture Model of Earth Observation Satellite Imagery Pixel Data
Aug 2012
Monte Carlo based non-linear mixel (mixed pixel) model of visible to near infrared radiometer of earth observation satellite imagery is proposed. Through comparative studies with actual real earth...
Provided by The Schwa
-
Whitepapers
2D Satellite Image Registration Using Transform Based and Correlation Based Methods
Jun 2012
Image registration is the process of geometrically aligning one image to another image of the same scene taken from different viewpoints or by different sensors. It is a fundamental image...
Provided by The Schwa
-
Whitepapers
Countermeasure for Round Trip Delay Which Occurs in Between Satellite and Ground With Software Network Accelerator
Jun 2012
Countermeasure for round trip delay which occurs in between satellite and ground with network accelerator is investigated together with operating system dependency on effectiveness of accelerator....
Provided by The Schwa
-
Whitepapers
HDL Implementation of Low Density Parity Check (LDPC) Decoder
Aug 2012
Low-Density Parity-Check (LDPC) codes are one of the most promising error-correcting codes approaching Shannon capacity and have been adopted in many applications. These codes offer huge...
Provided by International Journal of Electronics and Computer Science Engineering
-
Whitepapers
Distributed Joint Source and Channel Code With Correlated Information Sources
Aug 2012
In this paper, a new Distributed Joint Source-Channel Code (DJSCC) is proposed for a communication network with multiple correlated information sources. The DJSCC is performed by puncturing the...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
The Perceptual Objective Listening Quality Assessment Algorithm in Telecommunication
Aug 2012
In order to accomplish speech quality evaluation tasks in an efficient and economical way, objective computational models which simulate human hearing characteristics of speech perception have...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Performance Evaluation and Analysis of Bundle Protocol in Cislunar Communications
Aug 2012
The Bundle Protocol (BP) is developed to solve the new problems in deep space exploration. To date, little work has been done in evaluating the performance of BP applied to an interplanetary...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Two-Step Construction Method of Protograph-Based AR4JA Codes in Deep Space Communication
Aug 2012
This paper discusses the construction of the Accumulate-Repeat-4-Jagged-Accumulate(AR4JA) codes which is suitable for the deep-space communication based on the protograph. Two-step construction...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Wideband Space Time Statistical Model for Characterization of Satellite Communication Channel in Dense Multipath Environment
Mar 2010
This paper proposes a space-time statistical geometric model for characterization of multipath propagation of the satellite communication, which provides some insight into the spatial properties...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Half-Duplex Relaying With Serially-Concatenated Low-Density Generator Matrix (SCLDGM) Codes
Mar 2010
Recently, the integration of cooperation with coding has proven to be a very useful technique to enhance relay system performance. Relay systems based on Low-Density Parity Check (LDPC) codes have...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Power Efficient Partial Repeated Cooperation Scheme With Regular LDPC Code
Mar 2010
The partially repeated cooperation system employing Low Density Parity-Check (LDPC) codes achieves space diversity and extra coding gain at the same time. This paper focuses on the power...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Selective-Update Decoding of Non-Binary LDPC Codes
Mar 2010
Non-binary LDPC codes are promising error correcting techniques with very good performance, especially for high order fields. Using higher order fields enhances performance but, at the same time,...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Differential Encoding for Quadrature-Amplitude Modulation
Mar 2010
In this paper, the authors propose a novel differential encoder for QAM (Quadrature-Amplitude Modulation), by a look-up table instead of a rule. Using a table for differential encoding has the...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Reference Phasor Based Log-Likelihood Ratios for Pilot-Symbol-Assisted BPSK Transmission of LDPC Codes Over the Noncoherent Channel
Mar 2010
The authors derive the log-likelihood ratio for iterative decoding of low-density parity-check codes transmitted using Binary Phase-Shift-Keying (BPSK) with pilot-symbol-assisted modulation. This...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
On the Performance Evaluation of Quasi-Cyclic LDPC Codes With Arbitrary Puncturing
Mar 2010
A novel algorithm, named Improved Protograph-based EXtrinsic Information Transfer (IP-EXIT), is proposed in this paper. With the proposed algorithm, quite accurate performance evaluations of...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
The Undisputed Guide to Telecom Management Bliss
Nov 2012
This paper explains the five key steps to converting to the vCom service and one final destination - telecom management bliss. The steps are: meet the team, inventory analysis, convert the...
Provided by vCom solutions
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Whitepapers
Protograph EXIT Analysis Over Block Fading Channels With Application to Relays
May 2012
An accurate EXtrinsic Information Transfer (EXIT) analysis is developed for protograph Low-Density Parity-Check (LDPC) codes over the Block Fading Channel (BFC). The analysis is thus exploited for...
Provided by University of Bochum
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Whitepapers
Azimuth-Dependent Spatialization for a Teleconference Audio Display
Dec 2010
This paper proposes a novel scheme for the spatial rendition of audio in a teleconferencing situation. Several researchers have examined and established that there is a substantial improvement in...
Provided by Indian Institute of Technology Bombay
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Whitepapers
A Two-Stage Algorithm to Reduce Encoding Delay of Turbo Source Coding
Aug 2008
Lossless turbo source coding employs an iterative encoding algorithm to search for the smallest codeword length that guarantees zero distortion. Although such encoder achieves promising...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Novel Algebraic Constructions of Nonbinary Structured LDPC Codes Over Finite Fields
Aug 2008
In this paper, the authors present three algebraic methods for constructing structured non-binary LDPC codes over finite fields, among which the first method is based on the multiplicative...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Security White Paper
Mar 2009
The network world today can be a dangerous place. Network administrators need to worry about viruses, spybots and denial of service attacks, to name a few. In addition, a company needs to maintain...
Provided by TowersPerrin
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Whitepapers
Alternatives for Powering Telecommunications Base Stations
Dec 2008
The last decade has seen exponential growth in wireless communication. The growth of mobile networks coupled with intense competition has sharpened operators' focus on deployment logistics,...
Provided by Motorola
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Whitepapers
Design of a Software Radio Prototype for the Analysis of Beamformers in Satellite Communications
Aug 2007
Earth stations for downloading data from LEO satellites use large reflector antennas (usually, with diameters over 12 m for telemetry links). These antennas pose a number of impairments regarding...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A New Generation of Gallium Nitride (GaN) Based Solid State Power Amplifiers for Satellite Communication
Aug 2012
The introduction of Gallium Nitride High Electron Mobility Transistors (GaNHEMT) in early 2000 has left an undeniable mark on the entire satellite communication landscape. It is now possible for...
Provided by Advantech
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Whitepapers
Artemisa: New GNSS Receiver Processing Techniques for Positioning and Multipath Mitigation
Oct 2012
Advances in computation and signal processing technologies allow the implementation sophisticated non-linear synchronization techniques that can be integrated in the acquisition and tracking...
Provided by Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
