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Information Technology

Networking

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Displaying 251 - 275 of 833

Complex Systems Collected Images of the Month March 2008 - June 2010

June 16, 2010
Author(s)
Sanford P. Ressler
This document is a collection of twenty eight Complex Systems Image of the Month (IOM) illustrations. Each month as part of the Complex Systems Program in the Information Technology Laboratory an IOM is produced, posted to the Complex Systems web site and

Statistical Modeling of Harvestable Kinetic Energy for Wearable Medical Sensors

June 15, 2010
Author(s)
Nathalie Yarkony, Kamran Sayrafian, Antonio Possolo
Energy Harvesting (EH) refers to the process of capturing and storing energy from external sources or ambient environment. Kinetic energy harvested from the human body motion seems to be one of the most convenient and attractive solution for wearable

Study of Proposed Internet Congestion-Control Mechanisms

May 17, 2010
Author(s)
Kevin L. Mills, James J. Filliben, Dong Y. Cho, Edward J. Schwartz, Daniel I. Genin
This study describes a coherent set of modeling and analysis methods to investigate the behavior of large distributed systems. The methods are applied to compare several proposed Internet congestion-control mechanisms operating under a wide range of

How often and how long should a cognitive radio sense the spectrum?

April 7, 2010
Author(s)
Nader Moayeri
This paper presents a Bayesian framework and a pricing structure for a secondary wireless user that opportunistically uses a RF channel belonging to a network of N primary users. The secondary user operates in a time-slotted fashion, where each time slot

Grating-Enhanced Narrow-Band Spontaneous Parametric Down Conversion

March 10, 2010
Author(s)
Xiao Tang, Lijun Ma
We propose a new method to narrow the linewidth of entangled photons from spontaneous parametric down conversion incorporated with an internal Bragg grating. We study and show that it is a promising way to generate narrow-line entangled photons.

Asynchronous Cooperative MIMO Systems using A Linear Dispersion Structure

February 2, 2010
Author(s)
Hamid Gharavi
In this treatise, we propose a novel family of Asynchronous Cooperative Linear Dispersion Codes (ACLDCs),which is capable of maintaining full diversity in cooperative scenarios even at the presence of asynchronous reception. The linear dispersion structure

Complex Systems Program Activities Summary, Fiscal Years 2007-2008

January 12, 2010
Author(s)
Sanford P. Ressler
This report summarizes the work of the Complex Systems Program within NIST s Information Technology Laboratory. The Overview presents some background material and a high-level overview of the Program s activities including significant technical

A Hybrid Frame Concealment Algorithm for H.264/AVC

January 5, 2010
Author(s)
Hamid Gharavi
In packet-based video transmissions, packets loss due to channel errors may result in the loss of the whole video frame. Recently, many error concealment algorithms have been proposed in order to combat channel errors, however most of the existing

EDITOR IN CHIEF (EIC) MESSAGE

January 1, 2010
Author(s)
Hamid Gharavi
This Editor In Chief's (EIC) message is expected to appear in the January, 2010 issue of the IEEE Transactions on CAS for Video Technology (TCSVT). The editorial team will be under the leadership of the new EIC for a period of two years.

SER Performance Analysis for Physical Layer Network Coding over AWGN Channel

December 3, 2009
Author(s)
Yi Qian, Kejie Lu, Shengli Fu, Hsiao-Hwa Chen
While original network coding is proposed over data link layer, recent work suggests that it can also be implemented on physical layer. In fact it is more natural for wireless networks because of its omnidirectional transmission. In this paper, we

IPv6 Test Methods: General Description and Validation

November 30, 2009
Author(s)
J. S. Nightingale
The USG profile for IPv6 specifies requirements for host, router and network protection devices (NPD) and this document specifies the validation requirements for test methods and test specifications used to test these devices. It has become the practice

Rapidly-Deployable Mesh Network Testbed

November 30, 2009
Author(s)
Michael R. Souryal, Nader Moayeri, Andreas Wapf
This paper describes a wireless mesh network testbed for research in rapid deployment and auto-configuration of mesh nodes. Motivated by the needs of first responders and military personnel arriving to an incident area, we developed and tested an automated

The Benefits of Network Coding over a Wireless Backbone

November 30, 2009
Author(s)
Hui Guo, Yi Qian, Kejie Lu, Nader Moayeri
Network coding is a promising technology that can effectively improve the efficiency and capacity of multi-hop wireless networks by exploiting the broadcast nature of the wireless medium. However, existing studies have demonstrated that the benefits of
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