skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Physical Layer Simulation Study for the Coexistence of WLAN Standards


No abstract prepared.

 [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
Work for Others (WFO)
OSTI Identifier:
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: 5th International Topical Meeting on Nuclear Plant Instrumentation Control and Human Machine Interface Technology (NPIC&HMIT 2006), Albuquerque, NM, USA, 20061112, 20061116
Country of Publication:
United States

Citation Formats

Howlader, Mostofa, and Ewing, Paul D. Physical Layer Simulation Study for the Coexistence of WLAN Standards. United States: N. p., 2006. Web.
Howlader, Mostofa, & Ewing, Paul D. Physical Layer Simulation Study for the Coexistence of WLAN Standards. United States.
Howlader, Mostofa, and Ewing, Paul D. Sun . "Physical Layer Simulation Study for the Coexistence of WLAN Standards". United States. doi:.
title = {Physical Layer Simulation Study for the Coexistence of WLAN Standards},
author = {Howlader, Mostofa and Ewing, Paul D},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}

Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • This paper presents the results of a study on the performance of wireless local area network (WLAN) devices in the presence of interference from other wireless devices. To understand the coexistence of these wireless protocols, simplified physical-layer-system models were developed for the Bluetooth, Wireless Fidelity (WiFi), and Zigbee devices, all of which operate within the 2.4-GHz frequency band. The performances of these protocols were evaluated using Monte-Carlo simulations under various interference and channel conditions. The channel models considered were basic additive white Gaussian noise (AWGN), Rayleigh fading, and site-specific fading. The study also incorporated the basic modulation schemes, multiple accessmore » techniques, and channel allocations of the three protocols. This research is helping the U.S. Nuclear Regulatory Commission (NRC) understand the coexistence issues associated with deploying wireless devices and could prove useful in the development of a technical basis for guidance to address safety-related issues with the implementation of wireless systems in nuclear facilities. (authors)« less
  • A study is made of the effects of stable stratification on the fine-scale features of the flow in an evolving stable boundary layer (SBL). Large-eddy simulation (LES) techniques are used so that spatially and temporally varying and intermittent features of the turbulence can be resolved; traditional Reynolds-averaging approaches are not well suited to this. The LES model employs a subgrid turbulence model that allows upscale energy transfer (backscatter) and incorporates the effects of buoyancy. The afternoon, evening transition, and nighttime periods are simulated. Highly anisotropic turbulence is found in the developed SBL, with occasional periods of enhanced turbulence. Energy backscattermore » occurs in a fashion similar to that found in DNS, and is an important capability in LES of the SBL. Coherent structures are dominant in the SBL, as the damping of turbulent energy occurs more at the smaller, less organized scales.« less
  • Neutron diffraction and resistivity measurements on single crystals of ErRh/sub 4/B/sub 4/ have revealed that both superconductivity and ferromagnetic order coexist in this material between 0.71 K and 1.2 K. In this intermediate phase, a linear polarized modulated structure with a wavelength of approximately 100 A is observed. The modulated moment increases faster than the ferromagnetic moment down to 0.71 K and then disappears suddenly, with loss of superconductivity and a transition to a normal ferromagnetic state. This transition is accompanied by temperature hysteresis of about 60 mK. The same hysteresis, in the inverse sense, is exhibited by the ferromagneticmore » component. The intermediate phase is interpreted as being one of coexisting normal ferromagnetic domains and superconducting sinusoidally ordered domains.« less
  • The ground-state yrast band in {sup 176}Hg has been observed up to I = 10{Dirac_h} by using the recoil decay tagging (RDT) method. The irregularity of this band indicates that the prolate intruder band, seen in the heavier Hg isotopes near the neutron mid-shell, crosses the nearly spherical ground-state band of {sup 176}Hg above I = 6{Dirac_h}.