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Topic Area: Wireless
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Displaying records 21 to 30 of 96 records.
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21. Virtual Reality Platform to Study RF Propagation in Body Area Networks
Topic: Wireless
Published: 12/2/2012
Authors: Kamran Sayrafian, John G Hagedorn, Wen-Bin Yang, Judith Ellen Terrill
Abstract: Design of efficient wireless communication protocols for body area networks requires in-depth understanding of the propagation media i.e. the human body. As obtaining large amount of data for many scenarios and use-cases via physical experiment i ...

22. A Low-Complexity Solution to Decode Diversity-Oriented Block Codes in MIMO Systems with Inter-Symbol Interference
Topic: Wireless
Published: 10/1/2012
Authors: Hamid Gharavi, Chong Xu
Abstract: In this paper we firstly propose a block-code based general model to combat the Inter-Symbol Interference (ISI) caused by frequency selective channels in a Multi-Input Multi- Output (MIMO) system and/or by asynchronous cooperative transmissions. The ...

23. Radiation Pattern of an UWB Wearable Antenna: A Preliminary Study
Topic: Wireless
Published: 9/24/2012
Authors: Wen-Bin Yang, Kamran Sayrafian
Abstract: Inhomogeneity of the propagation medium in body area networks could have a great impact on the sensor node‰s antenna characteristics. This in turn could affect the quality of the communication links unless the impact of the human body has been pr ...

24. Impacts of 2.4 GHz ISM Band Interference on IEEE 802.15.4 Wireless Sensor Network Reliability in Buildings
Topic: Wireless
Published: 9/9/2012
Authors: Wenqi Guo, William M Healy, Mengchu Zhou
Abstract: With the recent emergence of standards, wireless solutions are ready to be deployed in building automation networks. IEEE 802.15.4 is a standard for short range wireless networks. Its major applications fields are home and building automation, as wel ...

25. Traffic Scheduling Technique for Smart Grid Advanced Metering Applications
Topic: Wireless
Published: 6/5/2012
Author: Hamid Gharavi
Abstract: In this paper, we present a multi-gate mesh network architecture that has been developed to ensure high performance and reliability under emergency conditions when a system expects to receive power outage notifications and exchanges. In order to hand ...

26. Battery Discharge Characteristics of Wireless Sensors in Building Applications
Topic: Wireless
Published: 4/11/2012
Authors: Wenqi Guo, William M Healy, Mengchu Zhou
Abstract: Sensor nodes in wireless networks often use batteries as their source of energy, but replacing or recharging exhausted batteries in a deployed network can be difficult and costly. Therefore, prolonging battery life becomes a principal objective ...

27. Analysis of Radio-Propagation Environments to Support Standards Development for RF-Based Electronic Safety Equipment
Series: Technical Note (NIST TN)
Report Number: 1559
Topic: Wireless
Published: 3/5/2012
Authors: Catherine A Remley, William F Young, Jacob L. Healy
Abstract: We analyze data from NIST field tests in which radio-propagation channel characteristics were measured at approximately the same physical locations where the performance of various RF-based firefighter distress beacons was tested. These side-by-side ...

28. Interference Tests for 900 MHz Frequency-Hopping Public-Safety Wireless Devices
Topic: Wireless
Published: 8/15/2011
Authors: Catherine A Remley, Michael R Souryal, William F Young, Daniel G. Kuester, David R Novotny, Jeffrey R Guerrieri
Abstract: 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 impor ...

29. Simulation of a MIMO System in a Reverberation Chamber
Topic: Wireless
Published: 8/15/2011
Authors: Helge Fielitz, Catherine A Remley, Christopher L Holloway
Abstract: We present a general method to test MIMO antenna setups and algorithms in a reverberation chamber. Our test set-up enables measurement of data throughput using standard laboratory instruments. Using this test set up, effects of antenna setups and/or ...

30. Static and Dynamic Propagation-Channel Impairments in Reverberation Chambers
Topic: Wireless
Published: 8/15/2011
Authors: Catherine A Remley, Sander Floris, Christopher L Holloway, Scott Prather
Abstract: We study the separate and combined effects of static and dynamic multipath channels created in a reverberation chamber on bit-error-rate measurements of digitally modulated signals. We demonstrate measurement methods to identify individually both sta ...

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