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Information Technology

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Displaying 1401 - 1425 of 2282

Soft-Decision Metrics for Coded Orthogonal Signaling in Symmetric Alpha-Stable Noise

January 1, 2008
Author(s)
Michael R. Souryal, E G. Larsson, B M. Peric, B R. Vojcic
This paper derives new soft decision metrics for coded orthogonal signaling in impulsive noise, more specifically symmetric alpha-stable noise. For the case of a known channel amplitude and known noise dispersion, exact metrics are derived both for Cauchy

Multi-Channel Mobile Ad-Hoc Links for Multimedia Communications

December 31, 2007
Author(s)
Hamid Gharavi
This paper is mainly concerned with multi-channel transmission of real-time information such as video over multi-hop ad-hoc links. We propose two multi-channel routing protocols. The first is based on single-path routing and aims at suppressing the intra

Indoor Localization: Technology That Can Save First Responder Lives

December 1, 2007
Author(s)
Nader Moayeri, Camillo A. Gentile, Kamran Sayrafian, Michael R. Souryal
Every year a number of first responders lose their lives while battling fires or rescuing civilians during such emergencies. Indoor localization or location tracking roughly provides the same capability inside buildings that GPS does outdoors. It allows a

DSR-Based Directional Routing Protocol for Ad Hoc Networks

November 14, 2007
Author(s)
Bin Hu, Hamid Gharavi
In this paper, a Dynamic Source Routing (DSR)-based directional routing protocol is invoked for wireless ad hoc networks using directional antennas. This is designed to balance the trade-off between co-channel interferences from nodes hops away, and the

Information Technology Laboratory Brochure

October 24, 2007
Author(s)
Elizabeth B. Lennon
This brochure describes the programs of the Information Technology Laboratory (ITL). Following a letter from the ITL Director, ITL's nine programs are described, and ITL's mission, core competencies, resources, products, and customers are given, followed

Custom Hardware to Eliminate Bottlenecks in QKD Throughput Performance

September 5, 2007
Author(s)
Alan Mink
The National Institute of Standards and Technology (NIST) high-speed quantum key distribution (QKD) system was designed to include custom hardware to support the generation and management of gigabit data streams. As our photonics improved our software

A Novel Model-Based Indoor Positioning Using Signal Strength

September 3, 2007
Author(s)
Kamran Sayrafian, D Kaspar
A simple technique to estimate the position of a mobile node inside a building is based on the Received Signal Strength (RSS). In a previous publication, we investigated the feasibility of using circular array antennas and beamforming in order to enable an

Guide to Secure Web Services

August 29, 2007
Author(s)
Anoop Singhal, Theodore Winograd, Karen A. Scarfone
The advance of Web services technologies promises to have far-reaching effects on the Internet and enterprise networks. Web services based on the eXtensible Markup Language (XML), SOAP, and related open standards, and deployed in Service Oriented

Standardizing Measurements of Autonomy in the Artificially Intelligent

August 28, 2007
Author(s)
Amy Hudson, Larry H. Reeker
The amount of control that an intelligent system has over their actions, whether they are able to act independently from their creator, plays a major factor in describing systems and in distinguishing them from each other. Different levels of autonomy

Estimation and Testing for the Common Intersection Point

August 22, 2007
Author(s)
Andrew L. Rukhin
The problem of estimating a common intersection point from a collection of straight lines and of testing the hypothesis that such a point exists are considered. The relationship to the error-in-variables regression and to the intersection-union principle

Border Gateway Protocol Security

July 17, 2007
Author(s)
D. Richard Kuhn, Kotikalapudi Sriram, Douglas Montgomery
This document introduces the Border Gateway Protocol (BGP), explains its importance to the internet, and provides a set of best practices that can help in protecting BGP. Best practices described here are intended to be implementable on nearly all

Robust Indoor Positioning Based on Received Signal Strength

July 10, 2007
Author(s)
Kamran Sayrafian, Julio Perez
RF-based indoor positioning is a challenging task due to the harsh indoor propagation environment. Techniques based on the received signal strength are simple to implement and offer low cost and effective alternatives for some applications. The main

A Call Admission Control Algorithm for WLAN in Heterogeneous Wireless Networks

June 25, 2007
Author(s)
SuKyoung Lee, David W. Griffith, Kyungsoo Kim, Nada T. Golmie
One major challenge in the integration of wireless LAN (WLAN) and cellular networks is call admission control (CAC). Without a suitable CAC mechanism for the integrated network, the two networking systems will work independently and cannot simultaneously

Common Industry Specification for Usability --Requirements

June 13, 2007
Author(s)
Mary F. Theofanos
.The Common Industry Specification for Usability - Requirements (CISU-R) helps usability professionals, product managers, and others working in product design and development to create usability requirements. It sets standards for specifying usability
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