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telecom hardware
(106 results)-
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
Modulation-Assisted UEP-LDPC Codes in Image Transmission
Sep 2009
Based on irregular UEP-LDPC codes, a modulation-assisted UEP scheme is proposed by using QPSK and 16QAM mapping, in order to achieve good tradeoff between reliability and spectrum efficiency....
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
A Design of Parity Check Matrix for Irregular LDPC Codes
Sep 2009
This paper outlines a work on a design of parity check matrix for Irregular LDPC codes. The design is based on the adjustment of the modified array LDPC codes and interleave-modified array LDPC...
Provided by Institute of Electrical & Electronic Engineers
-
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
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
-
Whitepapers
Distributed LDPC Coders in Cooperative Relay Networks
Sep 2009
In this paper, a new distributed LDPC coder is developed in the cooperative relay networks. Although the proposed scheme requires to use the same bandwidth as the conventional approach over OFDM...
Provided by Institute of Electrical & Electronic Engineers
-
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
LDPC Decoder Modelling and Evaluation Using RT-PEPA
Aug 2012
This paper presents a high-throughput memory efficient decoder for Low Density Parity Check (LDPC) codes in the high-rate wireless personal area network application. The novel techniques which can...
Provided by Academy & Industry Research Collaboration Center
-
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
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
-
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
-
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
-
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
-
Whitepapers
A Real-Time High-Throughput LDPC Decoder for IEEE 802.3an Standard
Mar 2010
The existing LDPC decoders are mostly based on the Belief-Propagation (BP) algorithms, due to good BER performances. However, they demand large chip areas. This paper proposes a high-throughput...
Provided by Institute of Electrical & Electronic Engineers
-
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
-
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
-
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
-
Whitepapers
EG-LDPC Codes for the Erasure Wiretap Channel
Dec 2009
The wiretap channel model, proposed by Wyner, has been studied by various authors from the perspectives of security, reliability and cryptographic protocols. A basic theme of these discussions has...
Provided by Indian Institute of Technology Madras
-
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
-
Whitepapers
Construction of Regular Quasi-Cyclic Protograph LDPC Codes Based on Vandermonde Matrices
Aug 2008
In this paper, the authors investigate the attainable performance of Quasi-Cyclic (QC) protograph Low-Density Parity-Check (LDPC) codes for transmission over both Additive White Gaussian Noise...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Log-Likelihood Metrics Based on Two-Symbol-Interval Observations for LDPC Codes With BDPSK Transmission
Aug 2008
Iterative decoding of low-density parity-check codes transmitted over non-coherent channels using binary differential phase-shift keying modulation is examined. Using the joint estimation approach...
Provided by Institute of Electrical & Electronic Engineers
-
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
-
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
-
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
-
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
-
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
-
White Papers
Experimental Study on Gaussian-Modulated Coherent States Quantum Key Distribution Over Standard Telecom Fiber
Sep 2007
In this paper, the authors present a fully fiber-based one-way Quantum Key Distribution (QKD) system implementing the Gaussian-Modulated Coherent States (GMCS) protocol. The system employs a...
Provided by University of Toronto
-
White Papers
New Results on Top-Down and Bottom-Up Statistical PLC Channel Modeling
Oct 2009
In this paper, the authors consider two different approaches for statistical power line channel modeling. The first method follows a top-down approach where the channel transfer function is...
Provided by University of Udine
-
White Papers
A Very Low Area ADC Architecture Capable of Supporting the Analog Front End of Powerline Communication Systems
Oct 2009
The Analog Front End (AFE) of the various PowerLine Communication (PLC) standards like HomePlug, IEEE P.1901 etc, requires an Analog to Digital Converter (ADC) at the side of the receiver to...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Characterization of PLC Communication Channel: A Networking Perspective
Oct 2009
PowerLine Communications (PLC) is experiencing a tremendous success and is expected to play a primary role in home networking scenarios. Nevertheless, little research effort has been devoted so...
Provided by Universita di Catania
-
White Papers
Efficient and Reliable Power Line Communications Through Coding and Diversity Techniques
Oct 2009
Recognizing the resemblance of Power Line Communication (PLC) channels and the frequency-selective radio-frequency (RF) fading channels, this paper considers efficient and reliable PLC through the...
Provided by Lehigh University
-
White Papers
Channel Reuse Improvement for Coexistence Between Access and In-Home PLC Systems With Dynamic Resource Allocation
Oct 2009
There are generally two application areas of the Broadband PowerLine Communications (PLC), which use the available power cables for the transmission of the telecommunication signals: Access...
Provided by Dresden University of Technology
-
White Papers
Simulation of Channel Characteristics for Complex Networks
Oct 2009
In this paper a novel approach to simulate a complex network is presented. In powerline communication the communication channel often comprises of complex networks of conductors, which primary...
Provided by Aarhus University
-
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
-
White Papers
Quasi-Cyclic Low-Density Parity-Check (QC-LDPC) Codes for Deep Space and High Data Rate Applications
Oct 2009
In this paper, the authors investigate and compare the performance of a selected class of Low-Density Parity-Check (LDPC) codes, i.e., Quasi-Cyclic (QC) LDPC codes, against the currently used...
Provided by Aristotle University of Thessaloniki
-
White Papers
Performance Evaluation of LDPC Codes on PLC Channel Compared to Other Coding Schemes
Dec 2009
In this paper, the authors study how power line communications are affected by different coding techniques. They investigate the case of LDPC coding scheme and its application to the PLC channel....
Provided by Aristotle University of Thessaloniki
-
White Papers
Improved Progressive Edge-Growth Algorithm for Fast Encodable LDPC Codes
May 2012
The Progressive Edge-Growth (PEG) algorithm is known to construct Low-Density Parity-Check (LDPC) codes at finite code lengths with large girths by establishing edges between symbol and check...
Provided by Springer Science+Business Media
-
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
-
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)
-
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
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
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
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
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
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
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
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
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
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
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
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
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
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)
-
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
-
White Papers
Improved Progressive Edge-Growth Algorithm for Fast Encodable LDPC Codes
May 2012
The Progressive Edge-Growth (PEG) algorithm is known to construct Low-Density Parity-Check (LDPC) codes at finite code lengths with large girths by establishing edges between symbol and check...
Provided by Springer Science+Business Media
-
White Papers
Performance Evaluation of LDPC Codes on PLC Channel Compared to Other Coding Schemes
Dec 2009
In this paper, the authors study how power line communications are affected by different coding techniques. They investigate the case of LDPC coding scheme and its application to the PLC channel....
Provided by Aristotle University of Thessaloniki
-
White Papers
Quasi-Cyclic Low-Density Parity-Check (QC-LDPC) Codes for Deep Space and High Data Rate Applications
Oct 2009
In this paper, the authors investigate and compare the performance of a selected class of Low-Density Parity-Check (LDPC) codes, i.e., Quasi-Cyclic (QC) LDPC codes, against the currently used...
Provided by Aristotle University of Thessaloniki
-
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
-
White Papers
Simulation of Channel Characteristics for Complex Networks
Oct 2009
In this paper a novel approach to simulate a complex network is presented. In powerline communication the communication channel often comprises of complex networks of conductors, which primary...
Provided by Aarhus University
-
White Papers
Channel Reuse Improvement for Coexistence Between Access and In-Home PLC Systems With Dynamic Resource Allocation
Oct 2009
There are generally two application areas of the Broadband PowerLine Communications (PLC), which use the available power cables for the transmission of the telecommunication signals: Access...
Provided by Dresden University of Technology
-
White Papers
Efficient and Reliable Power Line Communications Through Coding and Diversity Techniques
Oct 2009
Recognizing the resemblance of Power Line Communication (PLC) channels and the frequency-selective radio-frequency (RF) fading channels, this paper considers efficient and reliable PLC through the...
Provided by Lehigh University
-
White Papers
Characterization of PLC Communication Channel: A Networking Perspective
Oct 2009
PowerLine Communications (PLC) is experiencing a tremendous success and is expected to play a primary role in home networking scenarios. Nevertheless, little research effort has been devoted so...
Provided by Universita di Catania
-
White Papers
A Very Low Area ADC Architecture Capable of Supporting the Analog Front End of Powerline Communication Systems
Oct 2009
The Analog Front End (AFE) of the various PowerLine Communication (PLC) standards like HomePlug, IEEE P.1901 etc, requires an Analog to Digital Converter (ADC) at the side of the receiver to...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
New Results on Top-Down and Bottom-Up Statistical PLC Channel Modeling
Oct 2009
In this paper, the authors consider two different approaches for statistical power line channel modeling. The first method follows a top-down approach where the channel transfer function is...
Provided by University of Udine
-
White Papers
Experimental Study on Gaussian-Modulated Coherent States Quantum Key Distribution Over Standard Telecom Fiber
Sep 2007
In this paper, the authors present a fully fiber-based one-way Quantum Key Distribution (QKD) system implementing the Gaussian-Modulated Coherent States (GMCS) protocol. The system employs a...
Provided by University of Toronto
-
White Papers
New Constructions for UC Secure Computation Using Tamper-Proof Hardware
Oct 2010
The Universal Composability framework was introduced by Canetti to study the security of protocols which are concurrently executed with other protocols in a network environment. Unfortunately it...
Provided by UC Regents
-
White Papers
An Application-Oriented Model for Wireless Sensor Networks Integrated With Telecom Infra
Sep 2010
This paper aims to propose a significant way of remote access and real time monitoring of a particular geographic area by integrating wireless sensor clouds with existing Telecom infrastructure...
Provided by Indian Institute of Technology Kanpur
-
White Papers
An Algorithm for NGN Feature Interaction Dectection
Dec 2009
With service design open to third-party in the evolving telecom networks, dynamic method is suitable for Feature Interaction (FI) detection. When implementing this method, however, the violation...
Provided by Academy Publisher
-
White Papers
7 Tips for Negotiating Win-Win Telecom Contracts that Don't Cost More than You Bargained
Jan 2011
It has been a tough year for IT and telecom and the hangover promises to be around a bit longer as we take stock of the drastic reactionary measures we rushed into place to stop the cost...
Provided by ProfitLine
-
Product Specs
Avaya 1692 IP Speakerphone: A High-Quality, IP-Enabled Speakerphone for Conference Rooms
Jul 2010
The Avaya 1692 IP Speakerphone provides the convenience and productivity benefits inherent in a powerful, hands-free conference phone. It delivers the extensive set of Avaya Aura features directly...
Provided by Avaya
-
Product Specs
Avaya One-X Deskphone 9670G: One-Touch Access to Contacts, Information, and Applications
Apr 2009
The new Avaya one-X 9670G Deskphone is designed for the "Essential" user: someone who is constantly on the phone, handling multiple calls and is often mobile. The latest addition to the Avaya...
Provided by Avaya
-
Product Specs
Avaya One-X Deskphone Value Edition
Jan 2009
Avaya one-X is a portfolio of communications solutions that deliver a powerful and consistent communications experience for the end user - across a variety of devices and interfaces. Avaya one-X...
Provided by Avaya
-
Product Specs
Avaya One-X Deskphone 9640/9640G 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
-
Product Specs
Avaya Ethernet Routing Switch 8800
Apr 2010
Virtualization can transform your IT infrastructure and your business by providing a clear path to advanced applications that create a unified communications environment. Virtualization delivers...
Provided by Avaya
-
Product Specs
Avaya One-X Deskphone 9620/9620L/9620C IP Telephone
May 2009
The Avaya one-X Deskphone family features an intuitive user interface which helps to make users proficient and confident in performing common telephone tasks such as setting up a conference call...
Provided by Avaya
-
Product Specs
Avaya G450 Media Gateway
Jan 2010
The Avaya G450 Media Gateway provides a secure, reliable, and scalable platform for the delivery of Avaya Communication Manager-based IP telephony applications. It is targeted to mid to large...
Provided by Avaya
-
Product Specs
Avaya G430 Media Gateway
Jan 2010
The Avaya G430 Media Gateway provides a cost effective, scalable and secure platform for delivery of Avaya Communication Manager-based IP telephony applications. It is targeted to small to midsize...
Provided by Avaya
-
Product Specs
5600 Series IP Telephones
Nov 2007
Avaya 5600 series IP telephones are designed for organizations using IP Office that want a cost effective way to enjoy the benefits of converged communications. These H.323 IP telephones connect...
Provided by Avaya
-
Product Specs
Ethernet Routing Switch 4500 Series
Mar 2010
The Avaya Ethernet Routing Switch 4500 Series is a Stackable system providing highperformance, convergence-ready, secure and resilient Ethernet switching connectivity. Available as a range of 11...
Provided by Avaya
-
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
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
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
-
Whitepapers
Distributed LDPC Coders in Cooperative Relay Networks
Sep 2009
In this paper, a new distributed LDPC coder is developed in the cooperative relay networks. Although the proposed scheme requires to use the same bandwidth as the conventional approach over OFDM...
Provided by Institute of Electrical & Electronic Engineers
-
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
LDPC Decoder Modelling and Evaluation Using RT-PEPA
Aug 2012
This paper presents a high-throughput memory efficient decoder for Low Density Parity Check (LDPC) codes in the high-rate wireless personal area network application. The novel techniques which can...
Provided by Academy & Industry Research Collaboration Center
-
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
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
-
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
-
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
-
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
-
Whitepapers
A Real-Time High-Throughput LDPC Decoder for IEEE 802.3an Standard
Mar 2010
The existing LDPC decoders are mostly based on the Belief-Propagation (BP) algorithms, due to good BER performances. However, they demand large chip areas. This paper proposes a high-throughput...
Provided by Institute of Electrical & Electronic Engineers
-
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
-
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
-
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
-
Whitepapers
EG-LDPC Codes for the Erasure Wiretap Channel
Dec 2009
The wiretap channel model, proposed by Wyner, has been studied by various authors from the perspectives of security, reliability and cryptographic protocols. A basic theme of these discussions has...
Provided by Indian Institute of Technology Madras
-
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
-
Whitepapers
Construction of Regular Quasi-Cyclic Protograph LDPC Codes Based on Vandermonde Matrices
Aug 2008
In this paper, the authors investigate the attainable performance of Quasi-Cyclic (QC) protograph Low-Density Parity-Check (LDPC) codes for transmission over both Additive White Gaussian Noise...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Log-Likelihood Metrics Based on Two-Symbol-Interval Observations for LDPC Codes With BDPSK Transmission
Aug 2008
Iterative decoding of low-density parity-check codes transmitted over non-coherent channels using binary differential phase-shift keying modulation is examined. Using the joint estimation approach...
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
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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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
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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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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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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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
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White Papers
Experimental Study on Gaussian-Modulated Coherent States Quantum Key Distribution Over Standard Telecom Fiber
Sep 2007
In this paper, the authors present a fully fiber-based one-way Quantum Key Distribution (QKD) system implementing the Gaussian-Modulated Coherent States (GMCS) protocol. The system employs a...
Provided by University of Toronto
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White Papers
New Results on Top-Down and Bottom-Up Statistical PLC Channel Modeling
Oct 2009
In this paper, the authors consider two different approaches for statistical power line channel modeling. The first method follows a top-down approach where the channel transfer function is...
Provided by University of Udine
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White Papers
A Very Low Area ADC Architecture Capable of Supporting the Analog Front End of Powerline Communication Systems
Oct 2009
The Analog Front End (AFE) of the various PowerLine Communication (PLC) standards like HomePlug, IEEE P.1901 etc, requires an Analog to Digital Converter (ADC) at the side of the receiver to...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Characterization of PLC Communication Channel: A Networking Perspective
Oct 2009
PowerLine Communications (PLC) is experiencing a tremendous success and is expected to play a primary role in home networking scenarios. Nevertheless, little research effort has been devoted so...
Provided by Universita di Catania
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White Papers
Efficient and Reliable Power Line Communications Through Coding and Diversity Techniques
Oct 2009
Recognizing the resemblance of Power Line Communication (PLC) channels and the frequency-selective radio-frequency (RF) fading channels, this paper considers efficient and reliable PLC through the...
Provided by Lehigh University
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White Papers
Channel Reuse Improvement for Coexistence Between Access and In-Home PLC Systems With Dynamic Resource Allocation
Oct 2009
There are generally two application areas of the Broadband PowerLine Communications (PLC), which use the available power cables for the transmission of the telecommunication signals: Access...
Provided by Dresden University of Technology
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White Papers
Simulation of Channel Characteristics for Complex Networks
Oct 2009
In this paper a novel approach to simulate a complex network is presented. In powerline communication the communication channel often comprises of complex networks of conductors, which primary...
Provided by Aarhus University
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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
Quasi-Cyclic Low-Density Parity-Check (QC-LDPC) Codes for Deep Space and High Data Rate Applications
Oct 2009
In this paper, the authors investigate and compare the performance of a selected class of Low-Density Parity-Check (LDPC) codes, i.e., Quasi-Cyclic (QC) LDPC codes, against the currently used...
Provided by Aristotle University of Thessaloniki
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White Papers
Performance Evaluation of LDPC Codes on PLC Channel Compared to Other Coding Schemes
Dec 2009
In this paper, the authors study how power line communications are affected by different coding techniques. They investigate the case of LDPC coding scheme and its application to the PLC channel....
Provided by Aristotle University of Thessaloniki
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White Papers
Improved Progressive Edge-Growth Algorithm for Fast Encodable LDPC Codes
May 2012
The Progressive Edge-Growth (PEG) algorithm is known to construct Low-Density Parity-Check (LDPC) codes at finite code lengths with large girths by establishing edges between symbol and check...
Provided by Springer Science+Business Media
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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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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)
