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telecom hardware
(106 results)-
Whitepapers
Link Adaptation With Retransmissions for Non-Binary LDPC Codes
Mar 2010
The authors develop a link adaptation scheme based on non-binary LDPC codes for two scenarios: a frequency-selective quasi-static channel and a time-selective flat fading channel with very limited...
Provided by Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
-
Whitepapers
A Systematic Optimized Comparison Algorithm for LDPC Decoder
Feb 2008
Low-Density Parity Check (LDPC) code was introduced by Gallagher in 1962. It is a kind of binary linear block code whose parity check matrix is sparse which has much fewer 1's than a common...
Provided by National Chiao Tung University
-
Whitepapers
Design of Distributed Multi-Edge Type LDPC Codes for Two-Way Relay Channels
Apr 2011
This paper studies the problem of finding the optimum degree distribution for the distributed LDPC codes in the two-way relay channels. Based on the framework of Multi-Edge Type (MET) LDPC codes,...
Provided by Institute of Electrical & Electronic Engineers
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
Whitepapers
An Iterative Joint Linear-Programming Decoding of LDPC Codes and Finite-State Channels
Apr 2011
In this paper, the authors introduce an efficient iterative solver for the joint Linear-Programming (LP) decoding of Low-Density Parity-Check (LDPC) codes and Finite-State Channels (FSCs). In...
Provided by Institute of Electrical & Electronic Engineers
-
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
-
Whitepapers
Symbol-Based Belief Propagation Decoding of Reed-Solomon Codes
Mar 2009
The authors propose a symbol-based Belief Propagation (BP) algorithm for iterative soft-decision decoding of Reed-Solomon (RS) codes. Complexity reduction is achieved by using a Fast Fourier...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Low Complexity DVB-S2 LDPC Decoder
Mar 2009
The decoding complexity is the main issue in designing DVB-S2 Low Density Parity Check (LDPC) decoder. This paper proposes a low complexity decoder, which is based on a new row message passing...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Modified Iterative Two-Stage Hybrid Decoding Algorithm for Low-Density Parity-Check (LDPC) Codes
Mar 2009
This paper considers a modified iterative version of the two-stage hybrid algorithm for decoding Low-Density Parity Check (LDPC) codes. The hybrid-decision scheme is a decoding scheme used that...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Bit-Interleaved LDPC-Coded Modulation With Iterative Demapping and Decoding
Mar 2009
Bit-Interleaved Coded Modulation (BICM) is a suboptimal scheme from the Average Mutual Information (AMI) point of view due to independent demapping. However, this AMI loss can be neglected for...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Soft Detection of Modulation Diversity Schemes for Next Generation Digital Terrestrial Television
Jul 2008
The next generation of Digital Video Broadcasting Terrestrial Television (DVB-T2) standard requires to improve performance of the current DVB-T standard. Commercial and technical reasons suggest...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
The F-LDPC Family: High-Performance Flexible Modern Codes for Flexible Radio
Jul 2008
Flexibility is an increasingly important aspect of radio modem design. In this paper, flexibility within the PHYsical (PHY) layer in general, and the Forward Error Correction (FEC) component in...
Provided by Institute of Electrical & Electronic Engineers
-
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
-
Whitepapers
On the Growth Rate of Irregular GLDPC Codes Weight Distribution
Jul 2008
In this paper the exponential growth rate of irregular Generalized Low-Density Parity-Check (GLDPC) codes weight distribution is considered. Specifically, the Taylor series of the growth rate is...
Provided by Institute of Electrical & Electronic Engineers
-
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
-
Whitepapers
Noise Thresholds for Discrete LDPC Decoding Mappings
Oct 2008
For decoding Low-Density Parity-Check (LDPC) codes on discrete memoryless channels, a method to quantize messages and to find message-passing decoding functions for the variable and check nodes is...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Fast Identification of Error-Prone Patterns for LDPC Codes Under Message Passing Decoding
Oct 2008
Although density evolution accurately predicts the asymptotic performance of LDPC codes, it provides limited information for codes of short or moderate block length. For this reason, combinatorial...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
A Class of Quantum LDPC Codes Constructed From Finite Geometries
Oct 2008
Low-Density Parity Check (LDPC) codes are a significant class of classical codes with many applications. Several good LDPC codes have been constructed using random, algebraic, and finite...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Clustering of Cycles and Construction of LDPC Codes
Oct 2008
The clustering of cycles to form stopping sets are first observed by T. Tian and et al. As the determination of stopping sets of minimum size is NP-hard, the authors propose to consider clustering...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Rate Adaptive Binary Erasure Quantization With Dual Fountain Codes
Oct 2008
In this contribution, duals of fountain codes are introduced and their use for lossy source compression is investigated. It is shown both theoretically and experimentally that the source coding...
Provided by Institute of Electrical & Electronic Engineers
-
Product Specs
2400 Series Digital Telephones
Nov 2007
Avaya 2400 series digital telephones deliver advanced productivity-boosting features, including a large display, key labeling and a 100-entry call log. They are designed for both general business...
Provided by Avaya
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Product Specs
Avaya One-X Deskphone 9650 IP Telephone
May 2009
The Avaya one-X Deskphone solution family features an intuitive user interface which helps to make users proficient and confident in performing common telephone tasks such as setting up a...
Provided by Avaya
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Product Specs
The Avaya Desktop Video Device With the Avaya Flare Experience
Sep 2010
Communications and collaboration are a major challenge in today's enterprise, largely because the devices and user interfaces provided to today's enterprise workers are not up to the job:...
Provided by Avaya
-
Product Specs
1400 Series Digital Deskphones
Feb 2010
The 1400 Series Digital Deskphones family is designed for the same user profiles as the 9600 Series IP Deskphones or the 1600 Series IP Deskphones. By providing a range of endpoints covering the...
Provided by Avaya
-
Product Specs
Avaya 1220 IP Deskphone
Apr 2010
The 1220 IP Deskphone is a multi-line, intermediate-level desktop phone in the exciting 1200 Series IP Deskphones. Originally designed and optimized for small and medium-sized businesses, the 1200...
Provided by Avaya
-
Product Specs
Avaya 1210 IP Deskphone
Mar 2010
The 1210 IP Deskphone is a single-line, standard-level desktop phone in the exciting 1200 Series IP Deskphones. Originally designed and optimized for small and medium-sized businesses, the 1200...
Provided by Avaya
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Product Specs
Avaya 1100 Series Expansion Module
Apr 2010
The Avaya 1100 Series Expansion Module is an exciting addition to the award-winning 1100 Series IP Deskphones portfolio. An accessory available to selected models within the 1100 Series IP...
Provided by Avaya
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Product Specs
Avaya 1150E IP Deskphone
Mar 2010
The Avaya 1150E IP Deskphone with Gigabit Ethernet brings best-in-class IP Telephony and advanced communication features to ACD environments and the IP Contact Center. An ideal solution for agents...
Provided by Avaya
-
Product Specs
Avaya 1140E IP Deskphone
Apr 2010
The Avaya 1140E IP Deskphone with Gigabit Ethernet brings a new dimension in communication features and capabilities to the professional IP Deskphone. Ideally suited for managers and knowledge...
Provided by Avaya
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Product Specs
Avaya 1120E IP Deskphone
Apr 2010
The Avaya 1120E IP Deskphone with Gigabit Ethernet unveils an exciting array of innovative communication features and capabilities, ideally suited for office workers and administrative personnel....
Provided by Avaya
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Product Specs
Avaya 1110 IP Deskphone
Mar 2010
The Avaya 1110 IP Deskphone brings a new realm of capabilities to the standard-level set, designed to meet general-purpose communication needs. The single-line Avaya 1110 IP Deskphone delivers...
Provided by Avaya
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Product Specs
Avaya Aura Collaboration Server
Sep 2010
Today's businesses must be one step ahead of the competition. Productivity-enhancing communications solutions are a key element of an overall strategy. However, trialing new applications can be...
Provided by Avaya
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Product Specs
Avaya 1000 Series Video Conferencing Systems
Aug 2010
Avaya 1000 Series Video Conferencing systems is a suite of low cost, low bandwidth, high definition video endpoints - for point-to-point or between-system video, addressing the needs of small...
Provided by Avaya
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White Papers
Power-Optimized Solutions for Telecom Applications
Jan 2009
Some telecommunications (telecom) carriers now target a 20 percent power reduction per year on the equipment they deploy. This is a response to increasing power consumption in central offices,...
Provided by Altera
-
White Papers
Oracle Carrier-Grade Framework: A Foundation for Next-Generation Telecom Appliances
Mar 2010
Trends in the telecom market create an increasing demand for expanded and flexible services, across multiple networks and media types. At the same time, the profitability of the industry's basic...
Provided by Oracle
-
Whitepapers
Enterprise mobility: connecting to a world of opportunity
Nov 2009
Benefits of enterprise mobility span the business-to-employee (B2E), business-to-business (B2B) and business-to-consumer (B2C) spectrums. Enterprise mobil-ity can improve an organization's...
Provided by IBM
-
Case Studies
Bharti Airtel Case Study
Mar 2008
IBM worked with Bharti Airtel, India's leading telecom, to create an innovative model for IT delivery. For CIO Jai Menon, it means he can now focus more on launching and creating new revenue...
Provided by IBM
-
Resource Center
Small Business Phones: The Basics and Beyond
Sep 2008
Hear how small business phones using VoIP, unified messaging, video and other applications can help improve your customer relationships.
Provided by Cisco Systems
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White Papers
VoIP-News Office IP Phone Hardware Features Checklist
Jul 2007
Do you have all the latest features and functionality available to your office phone system? Check out the top-rated, must-have features for your office phone system in this FREE IP Phone...
Provided by VoIP-News
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White Papers
VoIP-News Office IP Phone Hardware Buyers Guide
Aug 2007
Considering upgrading or replacing your telephone hardware throughout your company? Get the FREE industry-leading step-by-step guide that gives you a 'game plan' on how to select the hardware...
Provided by VoIP-News
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Case Studies
Nextel Direct Connect Fact Sheet
Apr 2008
Sprint's Nextel Direct Connect gives your business the productivity and flexibility it needs to ensure that everything happens when it should--now. Read these testimonials for a quick snapshot of...
Provided by Sprint
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White Papers
Premise IP-PBX Checklist
Jul 2007
This informative research paper will help you understand the crucial questions and the information you need to understand before you buy. Before you sign on the dotted line with a hosted IP PBX...
Provided by Focus.com
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White Papers
Compare IP PBX systems from leading vendors like Cisco, Nortel and Avaya
Feb 2008
This Comparison Guide features the leading PBX systems from established vendors like Siemens, Cisco, Avaya and Nortel as well as cutting edge systems from new vendors like Shoretel and Fonality....
Provided by VoIP-News
-
White Papers
Enterprise IP PBX Buyers Guide: Features and Services That Matter
Feb 2008
This FREE checklist is the perfect to-do list for IT and Operations to accurately evaluate and plan a UC (Unified Communications) implementation across the enterprise. You'll catch malicious...
Provided by VoIP-News
-
White Papers
Top Myths of Unified Communications
Jun 2007
As with any new technology, myths and misinformation have sprung up about unified communications. As voice, video, and data networks have begun to converge, more organizations are seeing the value...
Provided by Cisco Systems
-
White Papers
Increase your Competitive Advantage with Business Communication Technology
Apr 2007
Most traditional business communications rely on telephone and paper-based processes. These resources do not readily support the level of productive interaction that growing businesses need to...
Provided by Cisco Systems
-
Whitepapers
Link Adaptation With Retransmissions for Non-Binary LDPC Codes
Mar 2010
The authors develop a link adaptation scheme based on non-binary LDPC codes for two scenarios: a frequency-selective quasi-static channel and a time-selective flat fading channel with very limited...
Provided by Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
-
Whitepapers
A Systematic Optimized Comparison Algorithm for LDPC Decoder
Feb 2008
Low-Density Parity Check (LDPC) code was introduced by Gallagher in 1962. It is a kind of binary linear block code whose parity check matrix is sparse which has much fewer 1's than a common...
Provided by National Chiao Tung University
-
Whitepapers
Design of Distributed Multi-Edge Type LDPC Codes for Two-Way Relay Channels
Apr 2011
This paper studies the problem of finding the optimum degree distribution for the distributed LDPC codes in the two-way relay channels. Based on the framework of Multi-Edge Type (MET) LDPC codes,...
Provided by Institute of Electrical & Electronic Engineers
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
Whitepapers
An Iterative Joint Linear-Programming Decoding of LDPC Codes and Finite-State Channels
Apr 2011
In this paper, the authors introduce an efficient iterative solver for the joint Linear-Programming (LP) decoding of Low-Density Parity-Check (LDPC) codes and Finite-State Channels (FSCs). In...
Provided by Institute of Electrical & Electronic Engineers
-
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
-
Whitepapers
Symbol-Based Belief Propagation Decoding of Reed-Solomon Codes
Mar 2009
The authors propose a symbol-based Belief Propagation (BP) algorithm for iterative soft-decision decoding of Reed-Solomon (RS) codes. Complexity reduction is achieved by using a Fast Fourier...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Low Complexity DVB-S2 LDPC Decoder
Mar 2009
The decoding complexity is the main issue in designing DVB-S2 Low Density Parity Check (LDPC) decoder. This paper proposes a low complexity decoder, which is based on a new row message passing...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Modified Iterative Two-Stage Hybrid Decoding Algorithm for Low-Density Parity-Check (LDPC) Codes
Mar 2009
This paper considers a modified iterative version of the two-stage hybrid algorithm for decoding Low-Density Parity Check (LDPC) codes. The hybrid-decision scheme is a decoding scheme used that...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Bit-Interleaved LDPC-Coded Modulation With Iterative Demapping and Decoding
Mar 2009
Bit-Interleaved Coded Modulation (BICM) is a suboptimal scheme from the Average Mutual Information (AMI) point of view due to independent demapping. However, this AMI loss can be neglected for...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Soft Detection of Modulation Diversity Schemes for Next Generation Digital Terrestrial Television
Jul 2008
The next generation of Digital Video Broadcasting Terrestrial Television (DVB-T2) standard requires to improve performance of the current DVB-T standard. Commercial and technical reasons suggest...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
The F-LDPC Family: High-Performance Flexible Modern Codes for Flexible Radio
Jul 2008
Flexibility is an increasingly important aspect of radio modem design. In this paper, flexibility within the PHYsical (PHY) layer in general, and the Forward Error Correction (FEC) component in...
Provided by Institute of Electrical & Electronic Engineers
-
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
-
Whitepapers
On the Growth Rate of Irregular GLDPC Codes Weight Distribution
Jul 2008
In this paper the exponential growth rate of irregular Generalized Low-Density Parity-Check (GLDPC) codes weight distribution is considered. Specifically, the Taylor series of the growth rate is...
Provided by Institute of Electrical & Electronic Engineers
-
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
-
Whitepapers
Noise Thresholds for Discrete LDPC Decoding Mappings
Oct 2008
For decoding Low-Density Parity-Check (LDPC) codes on discrete memoryless channels, a method to quantize messages and to find message-passing decoding functions for the variable and check nodes is...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Fast Identification of Error-Prone Patterns for LDPC Codes Under Message Passing Decoding
Oct 2008
Although density evolution accurately predicts the asymptotic performance of LDPC codes, it provides limited information for codes of short or moderate block length. For this reason, combinatorial...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
A Class of Quantum LDPC Codes Constructed From Finite Geometries
Oct 2008
Low-Density Parity Check (LDPC) codes are a significant class of classical codes with many applications. Several good LDPC codes have been constructed using random, algebraic, and finite...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Clustering of Cycles and Construction of LDPC Codes
Oct 2008
The clustering of cycles to form stopping sets are first observed by T. Tian and et al. As the determination of stopping sets of minimum size is NP-hard, the authors propose to consider clustering...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Rate Adaptive Binary Erasure Quantization With Dual Fountain Codes
Oct 2008
In this contribution, duals of fountain codes are introduced and their use for lossy source compression is investigated. It is shown both theoretically and experimentally that the source coding...
Provided by Institute of Electrical & Electronic Engineers
