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unified communications
(35817 results)-
White Papers
Adaptive Transmission of Multi-Layered Video Over Wireless Fading Channels
June 1, 2007 12:00am PDT
In this paper, adaptive transmission of scalable multi-layered video with Quality of Service (QoS) assurance over wireless channels is studied. By properly formulating the channel fading as a...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
How To Use Video And Rich Media To Drive Online Sales And Loyalty
June 1, 2007 12:00am PDT
Online videos are growing in popularity, as more and more people watch videos on the Web - from movie previews to amateur productions. As competition increases on the Web, big businesses are now...
Provided by: PowerHomeBiz.com
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White Papers
Resource-Aware and Link Quality Based Routing Metric for Wireless Sensor and Actor Networks
June 1, 2007 12:00am PDT
This paper presents a Resource-aware and Link Quality based (RLQ) routing metric to address energy limitations, link quality variations, and node heterogeneities in Wireless Sensor and Actor...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
A Dynamic Service Level Negotiation Mechanism for QoS Provisioning in NGEO Satellite Networks
June 1, 2007 12:00am PDT
Satellite communication systems exhibit important and unique features that qualify them to be an integral part of a global ubiquitous information system. Given the universality of the Internet...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Performance Study of Bandwidth Allocation Techniques for QoS-Constrained Satellite Networks
June 1, 2007 12:00am PDT
The paper analyzes the performance of the bandwidth allocation process over satellite communication systems in presence of specific Quality of Service (QoS) requirements. The reference allocation...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Performance Evaluation of Network Systems Accounting for User Behaviors
June 1, 2007 12:00am PDT
Considering user behaviors in the performance evaluation of mobile networks is crucial as traffic generation in such networks is highly dependent on mobility and communication activities of mobile...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Empirical Study on Inferring BGP Routing Instability and Its Location Based on Single Point Observation
June 1, 2007 12:00am PDT
As the Internet has become a communication infrastructure, inter-domain routing instabilities have become prone to serious problems. Some studies have proposed methods that infer instabilities and...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
A Statistical Bit Error Generator for Emulation of Complex Forward Error Correction Schemes
June 1, 2007 12:00am PDT
Forward Error Correction (FEC) schemes are generally used in wireless communication systems to maintain an acceptable quality of service. Various models have been proposed in literature to predict...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Design of a Stabilizing Second-Order Congestion Controller for Large-Delay Networks
June 1, 2007 12:00am PDT
This paper addresses the problem of the stability of congestion control for networks with large round-trip communication delays. Nearly all the existed AQM schemes neglect the impact on system...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Utility-Aware Resource Allocation for Multi-Stream Overlay Multicast
June 1, 2007 12:00am PDT
Overlay multicast, which performs topology construction and data relaying in the application layer, has recently emerged as a promising vehicle for data distribution. In most of the existing...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
A Multilink Protocol With the Per Flow Resequencing and Its Performance Evaluation
June 1, 2007 12:00am PDT
Procedures that provide a virtual link service aggregating bandwidths of multiple physical links are called a multilink protocol. The multilink protocol enables to utilize bandwidths of multiple...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
NATALIE: An Adaptive, Network-Aware Traffic Equalizer
June 1, 2007 12:00am PDT
The bandwidth of multiple physical communication links can be aggregated with inverse multiplexing to create a single, higher capacity logical communication link. However, achieving the maximum...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Large System Performance Evaluation of the DS/CDMA Relay Channel Using Linear Receivers
June 1, 2007 12:00am PDT
This paper considers a relay communication system where cooperative diversity is achieved by spreading the relay transmissions using Direct-Sequence CDMA (DS/CDMA). The authors derive expressions...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Characterization of Mutual Information of Spatially Correlated MIMO Channels With Keyhole
June 1, 2007 12:00am PDT
The authors characterize the statistical properties of the mutual information between the transmitter and the receiver of a Multiple-Input Multiple-Output (MIMO) communication system in case of...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Capacity Achieving Pilot Design for MIMO-OFDM Over Time-Varying Frequency-Selective Channels
June 1, 2007 12:00am PDT
In this paper, the authors analyze the capacity of MIMO-OFDM systems that utilize pilot symbols to acquire estimation of the radio channel at the receiver. An analytical framework is developed to...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Maximum-Likelihood Receivers for FFH/BFSK Systems With Multitone Jamming Over Frequency-Selective Rayleigh Fading Channels
June 1, 2007 12:00am PDT
In this paper, the authors have investigated the Maximum-Likelihood (ML) receivers for the Fast Frequency-Hopped Binary Frequency-Shift-Keying (FFH/BFSK) spread-spectrum communications system with...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Error Floors of LDPC Coded BICM
June 1, 2007 12:00am PDT
In recent years performance prediction for communication systems utilizing iteratively decodable codes has been of considerable interest. There have been significant breakthroughs as far as the...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Joint Transmitter and Receiver Optimization for Continuous-Time Overloaded Gaussian Multiple-Access Channels
June 1, 2007 12:00am PDT
Under general asymmetric Signal-to-Interference-plus-Noise Ratio (SINR) constraints at the output of Linear Minimum Mean-Squared Error (LMMSE) receivers, the joint transmitter and receiver...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
On the Optimal Amount of Training for Peak-Power-Limited Rayleigh Fading Channels
June 1, 2007 12:00am PDT
The authors consider the optimal amount of training for single-antenna Rayleigh flat fading channels with peak-power-limited input. The receiver uses known training symbols to perform Minimum Mean...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Selected Mapping With LPDC Codes Constructed by Modified Progressive Edge Growth
June 1, 2007 12:00am PDT
The Peak to Mean Envelope Power Ratio (PMEPR) problem in multi-carrier communications can be significantly reduced, if one of several alternative transmit sequences can be selected. The authors...
Provided by: Institute of Electrical and Electronics Engineers
