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Search Publications by: Nader Moayeri (Fed)

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Displaying 1 - 25 of 41

Indoor Localization Accuracy of Major Smartphone Location Apps

April 14, 2019
Author(s)
Nader Moayeri, Chang Li, Lu Shi
NIST carried out comprehensive testing in five large buildings to evaluate the accuracy of Fused Location Provider (FLP) Application Programming Interface (API) running on Android phones with that of Core Location Framework running on iPhones. The testing

Wireless Activities in the 2 GHz Radio Bands in Industrial Plants

September 27, 2017
Author(s)
Yongkang Liu, Nader Moayeri
Wireless connections are becoming popular in industrial environments that increasingly carry sensing and actuation data over the air. In industrial plants, activities of legacy wireless systems have shaped the channel usage in the radio spectrum bands for

Real-Time Scheduling for Wireless Networks with Random Deadlines

July 26, 2017
Author(s)
Mohamed Hany, Nader Moayeri
The use of wireless communications in industrial environments is motivated by the flexibility that wireless networks provide and their cost-efficient setup and maintenance. Various wireless technologies have been introduced to satisfy the strict industrial

Channel Modeling and Performance of Zigbee Radios in an Industrial Environment

May 31, 2017
Author(s)
Mehrdad Damsaz, Derek Guo, Jeff Peil, Wayne Stark, Nader Moayeri, Rick Candell
In this paper we describe measurements of wireless propagation characteristics to develop path loss models in industrial environments. The models for path loss we develop are two-slope models in which the path loss is a piecewise linear relation with the

Effects of Wireless Packet Loss in Industrial Process Control Systems

February 9, 2017
Author(s)
Yongkang Liu, Rick Candell, Nader Moayeri
Timely and reliable sensing and actuation control are essential in networked control. This depends on not only the precision/quality of the sensors and actuators used but also on how well the communications links between the field instruments and the

A Simulation Framework for Industrial Wireless Networks and Process Control Systems

May 6, 2016
Author(s)
Yongkang Liu, Richard Candell, Nader Moayeri, Kang B. Lee
Factory and process automation systems are increasingly employing information and communications technologies to facilitate data sharing and analysis in integrated control operations. Wireless connections provide flexible access to a variety of field

Effects of Wireless Packet Loss in Industrial Process Control Systems

November 12, 2015
Author(s)
Yongkang Liu, Rick Candell, Nader Moayeri
Timely and reliable sensing and actuation control are essential in networked control. This depends on not only the precision/quality of the sensors and actuators used but also on how well the communications links between the field instruments and the

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

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

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