U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by:

Search Title, Abstract, Conference, Citation, Keyword or Author
Displaying 26 - 50 of 56

Dynamic Spectrum Access: Current State of the Art and Future Challenges

February 2, 2014
Author(s)
Anirudha Sahoo, Michael R. Souryal
Dynamic Spectrum Access (DSA) is emerging as a promising technology to mitigate the spectrum scarcity caused by static frequency allocations. Despite the clear need for more efficient allocation, however, DSA faces a number of challenges, chief among them

Modeling a Nationwide Public Safety Broadband Network

June 1, 2013
Author(s)
Richard A. Rouil, Antonio Izquierdo Manzanares, Michael R. Souryal, Camillo Gentile, David W. Griffith, Nada T. Golmie
As governments plan nationwide, interoperable broadband networks for their public safety services, the challenge arises of determining how and where to invest limited resources to meet demanding requirements. The United States is at the early stages of

Wireless Network Deployment in the Smart Grid: Design and Evaluation Issues

November 30, 2012
Author(s)
Camillo A. Gentile, David W. Griffith, Michael R. Souryal
The projected use of the power grid for “smart” applications such as advanced metering and distributed automation will require highly reliable, secure, well-designed and managed communication networks. While many of the benefits of wireless communications

Wireless Networks for Smart Grid Applications

June 29, 2012
Author(s)
David W. Griffith, Michael R. Souryal, Nada T. Golmie
This chapter discusses the use of wireless networks in the context of the smart grid. First, it provides an overview of the various applications envisaged in the smart grid and discusses their communication requirements. Sifting through thousands of

Analysis of Advanced Metering over a Wide Area Cellular Network

October 17, 2011
Author(s)
Michael R. Souryal, Nada T. Golmie
This paper presents a framework for analysis of the coverage and capacity of advanced metering over a wide area cellular network. The coverage analysis predicts the maximum cell size subject to an outage criterion, and the capacity analysis predicts the

Interference Tests for 900 MHz Frequency-Hopping Public-Safety Wireless Devices

August 15, 2011
Author(s)
Catherine A. Remley, Michael R. Souryal, William F. Young, Daniel G. Kuester, David R. Novotny, Jeffrey R. Guerrieri
We discuss free-field measurement methods designed to quantify interference between wireless devices such as RF identification systems and RF-based emergency beacons used by fire fighters. For public safety applications, standardized testing is important

RFID-based Localization and Tracking Technologies

April 1, 2011
Author(s)
Michael R. Souryal, Lionel M. Ni, Dian Zhang
Radio Frequency Identification (RFID) usually incorporates a tag into an object for the purpose of identification or localization using radio signals. It has gained a lot of attention recently due to its advantages in terms of low cost and easy deployment

An Integrated PHY and MAC Layer Model for Half-Duplex IEEE 802.11 Networks

November 2, 2010
Author(s)
David W. Griffith, Michael R. Souryal, Camillo A. Gentile, Nada T. Golmie
This paper introduces an IEEE 802.11 analytical model that examines uplink and downlink communications between non-saturated stations and a non-saturated access point. The model integrates channel effects and collisions into a single expression for the

A Methodology to Evaluate Wireless Technologies for the Smart Grid

October 4, 2010
Author(s)
Michael R. Souryal, Camillo A. Gentile, David W. Griffith, David E. Cypher, Nada T. Golmie
This paper presents a methodology for assessing the suitability of various wireless technologies for meeting the communication requirements of Smart Grid applications. It describes an approach for translating application requirements to link traffic

Simulation of a Medium Frequency Mesh Network for Communications in Underground Mines

October 3, 2010
Author(s)
Michael R. Souryal, Fabien A. Valoit, Hui Guo, Nader Moayeri, Nicholas W. Damiano, David P. Snyder
Signals at the lower end of the medium frequency range (300 kHz to 3000 kHz) propagate with relatively low attenuation along existing metallic infrastructure in an underground mine, such as cables, pipes and rails. Exploiting this capability, low-bandwidth

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

Measuring Indoor Mobile Wireless Link Quality

June 14, 2009
Author(s)
Michael R. Souryal
This paper investigates methods for link quality measurement of an indoor, time-varying wireless link. Link quality estimates are used for a number of higher-layer functions, including rate adaptation, routing, and topology control. The objective is to

Diversity Performance of a Practical Non-Coherent Detect-and-Forward Receiver

November 30, 2008
Author(s)
Michael R. Souryal, Huiqing You
We propose a non-coherent receiver for the fixed detect-and-forward relay channel and derive a closed-form tight upper bound on its bit error probability in Rayleigh fading channels. Using this upper bound, we show that the receiver achieves nearly full

Non-Coherent Amplify-and-Forward Generalized Likelihood Ratio Test Receiver

November 30, 2008
Author(s)
Michael R. Souryal
This paper proposes a simple non-coherent amplify-and-forward receiver for the relay channel and evaluates its diversity performance for Rayleigh fading channels. We use the generalized likelihood ratio test to obtain the decision rule in closed form

Interference Avoidance in Rapidly Deployed Wireless Ad hoc Incident Area Networks

April 18, 2008
Author(s)
Mohamed T. Refaei, Nader Moayeri, Michael R. Souryal
A common strategy for responding to indoor emergency scenarios is to rapidly deploy a group of first responders inside the incident area and an incident command center outside of the incident area. First responders are equipped with radios that allow them

Quantize-and-Forward Relaying with M-ary Phase Shift Keying

March 31, 2008
Author(s)
Michael R. Souryal, Huiqing You
Using cooperative transmission, two or more single-antenna users can share their antennas to achieve spatial diversity in a slow fading channel. One relaying protocol that achieves diversity, amplify-and-forward (AF), is striking in its simplicity, but

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

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

Real-Time Deployment of Multihop Relays for Range Extension

June 11, 2007
Author(s)
Michael R. Souryal, Johannes Geissbuehler, Leonard E. Miller, Nader Moayeri
When the range of single-hop wireless communication is limited by distance or harsh radio propagation conditions, relays can be used to extend the communication range through multihop relaying. This paper targets the need in certain scenarios for rapid

Link Assessment in an Indoor 802.11 Network

April 1, 2006
Author(s)
Michael R. Souryal, Luke Klein-Berndt, Leonard E. Miller, Nader Moayeri
This paper presents the empirical results and analysis of a link variability study for an indoor, stationary 802.11 network subject to external interference. The objective is to characterize the relationships between the packet loss rate on a link and the