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Advanced communications

Wireless (RF)

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Displaying 276 - 300 of 637

Dynamic Spectrum Access Algorithms Based on Survival Analysis

December 20, 2017
Author(s)
Timothy Hall, Anirudha Sahoo, Robert C. Hagwood, Sarah B. Streett
In this study, we design and implement two algorithms for dynamic spectrum access (DSA) that are based on survival analysis. They use a non-parametric estimate of the cumulative hazard function to predict the remaining idle time available for secondary

SDR-Based Experiments for LTE-LAA Based Coexistence Systems with Improved Design

December 4, 2017
Author(s)
Yao Ma, Ryan T. Jacobs, Daniel G. Kuester, Jason B. Coder, William F. Young
To enhance spectrum efficiency in next generation heterogeneous wireless systems, it is important to improve shared spectrum usage between unlicensed long-term evolution (LTE) systems, such as the license assisted access (LAA), and legacy systems, such as

Estimating and Correcting the Device-Under-Test Transfer Function in Loaded Reverberation Chambers for Over-the-Air Tests

December 1, 2017
Author(s)
Catherine A. Remley, Ryan J. Pirkl, Chih-Ming Wang, Damir Senic, Arvand Homer, Matt V. North, Maria G. Becker, Robert D. Horansky, Christopher L. Holloway
We assess the potential error in measurements of the power transfer function corresponding to a reverberation chamber set-up when different antenna types are used for the reference and DUT measurements. We derive a mathematical description of the transfer

Throughput Study for Channel Bonding in IEEE 802.11ac Networks

December 1, 2017
Author(s)
Munsuk Kim, Tanguy Ropitault, SuKyoung Lee, Nada T. Golmie
Several analytical models for the channel bonding feature of IEEE 802.11ac have been presented for performance estimation. However, the accuracy of such models is limited by the assumptions that there are no collisions or all nodes are in saturated state

3.5 GHz Waveform Generation for Testing and Development of ESC Detectors

November 17, 2017
Author(s)
Raied M. Caromi, John Mink, Michael R. Souryal
Environmental Sensing Capability (ESC) sensors will be used in the 3.5 GHz Citizens Broadband Radio Service (CBRS) to detect and report the presence of federal incumbent radar signals in 100 MHz of spectrum. Unlike traditional radar detection schemes, ESC

Requirements for Spectrum Monitoring in Industrial Environments

November 16, 2017
Author(s)
Murat Aksu, Richard Candell
Spectrum monitoring serves as the eyes and ears of the spectrum management process and helps spectrum managers to plan and use frequencies, avoid incompatible usage, and identify sources of harmful interference. The key objective for this research at NIST

Characterization for an Industrial Wireless Network in a Gas Sensing Scenario

November 8, 2017
Author(s)
Mohamed Hany, Rick Candell
Employing wireless communications in gas sensing and air quality monitoring is extremely essential in many industrial scenarios where wired networks cannot perform the task safely and effectively. In industrial environments, deploying wireless gas sensing

NIST Channel Sounder Overview and Channel Measurements in Manufacturing Facilities

November 8, 2017
Author(s)
Jeanne T. Quimby, Richard Candell, Catherine A. Remley, David R. Novotny, Joseph Diener, Peter B. Papazian, Alexandra Curtin, Galen H. Koepke
Manufacturers are increasingly choosing wireless platforms to replace wired ones due to their ease of installation, upgrade, and reconfigurability. Reliable and secure real-time performance of wireless platforms is technically challenging because wireless

Interference Tests at Room Temperature Applied to Deployed Low-Noise Receivers

October 18, 2017
Author(s)
Daniel G. Kuester, Duncan A. McGillivray, Adam J. Wunderlich, William F. Young
Wireless interference tests are often performed in shielded anechoic and semi-anechoic chambers near room temperature. The corresponding test condition experienced by a receiver DUT is antenna noise temperature equal to physical room temperature (barring

Channel De-embedding and Measurement System Characterization for MIMO at 75 GHz

October 14, 2017
Author(s)
Alexandra Curtin, David R. Novotny, Alex Yuffa
Abstract—We explore the development of a sparse set of measurements for array calibration, relying on coherent multi- channel data acquisition of wideband signals at 75 GHz, and the hardware characterization and post-processing necessary to perform channel

Adaptive synchronization reference selection for out-of-coverage Proximity Services (ProSe)

October 8, 2017
Author(s)
Samantha M. Gamboa Quintiliani, Fernando J. Cintron, David W. Griffith, Richard A. Rouil
Proximity services (ProSe) is a Long Term Evolution Advanced (LTE-A) feature that allows User Equipments (UEs) to communicate without the need of routing the data throughout the network. In this paper, we studied the synchronization protocol used by ProSe

The Role of Filtering Higher Order Reflections in Antenna Extrapolation Measurements

September 30, 2017
Author(s)
Rob Horansky, Mohit S. Mujumdar, Dylan Williams, Kate Remley, David R. Novotny, Michael H. Francis
With more and more wireless devices being made with no test ports, and with the need to test these devices in real-world scenarios with no cable interference, over-the-air (OTA) testing has been dominating the test and manufacture industry. At NIST, we are

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

Methods for Channel Sounder Measurement Verification

September 23, 2017
Author(s)
Kate Remley, Camillo Gentile, Alenka Zajic, Jeanne Quimby
We describe an activity of the 5G mmWave Channel Sounder Alliance to verify the hardware performance of channel sounders operating at mmWave frequencies. Such verification procedures are critical when attempting to compare data from sounders having

Black Box Measurement of System Noise in Integrated Wireless Receivers

September 13, 2017
Author(s)
Daniel G. Kuester, Duncan A. McGillivray, Sheryl M. Genco, Dazhen Gu
Tightly-integrated antennas and inaccessible radio frequency (RF) outputs are common barriers to measuring system noise in integrated wireless receive systems. We propose a solution centered on locating "SNR isoresponses" --- processed receiver outputs

Multiple Sources in a Reverberant Environment: The "Cocktail Party Effect"

September 3, 2017
Author(s)
Perry F. Wilson
This electronic Acoustics and electromagnetics have a number of parallels based on similar equations describing propagation, reflection, and reverberation. This paper considers one example, the "cocktail party effect", that describes speech comprehension

3.5 GHz Environmental Sensing Capability Detection Thresholds and Deployment

September 1, 2017
Author(s)
Thao Nguyen, Anirudha Sahoo, Michael R. Souryal, Timothy Hall
Spectrum sharing in the 3.5~GHz band between commercial and government users along U.S. coastal areas depends on an Environmental Sensing Capability (ESC)---that is, a network of radio frequency sensors and a decision system---to detect the presence of

3.5 GHz Radar Waveform Capture at Fort Story

August 4, 2017
Author(s)
Paul D. Hale, Jeffrey A. Jargon, Peter J. Jeavons, Michael R. Souryal, Adam J. Wunderlich, Mark Lofquist
We describe measurements to create a library of high-fidelity waveforms of federal incumbent radar signals currently operating in the 3550 MHz – 3650 MHz (“3.5 GHz”) band. In this second phase of assembling the library, measurements were collected at Fort

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
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