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Displaying records 31 to 40 of 98 records.
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31. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905956

32. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904976

33. The Reverberation Chamber's Unstirred Field: A Validation of the Image Theory Interpretation
Topic: Wireless
Published: 8/15/2011
Authors: Ryan J. Pirkl, John M Ladbury, Catherine A Remley
Abstract: Synthetic aperture measurements of a reverberation chamber's unstirred wireless channel are used to compare the observed power, time-of-arrival, and angle-of-arrival of unstirred multipath components to that predicted by ray/image theory for a re ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907962

34. Ant-Colony Based Near-ML Block Decoder in Asynchronous Cooperative MIMO Systems Using a Linear Dispersion Structure
Topic: Wireless
Published: 6/5/2011
Authors: Hamid Gharavi, Chong Xu
Abstract: The linear dispersion structure is employed to accommodate the dynamic topology of cooperative networks, as well as to achieve higher throughput than conventional space-time codes based on orthogonal designs. Asynchronous Cooperative Liner Dispersio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907007

35. Pixel Interlacing Based Video Transmission for Low-complexity Intra-frame Error Concealment
Topic: Wireless
Published: 6/1/2011
Author: Hamid Gharavi
Abstract: When multi-path fading and interference frequently disrupts a mobile radio communication system, it can seriously undermine its reliability for transmission of compressed video signals. In this paper, we present a pixel interlacing based video transm ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908154

36. Selective Pixel Interpolation for Spatial Error Concealment
Topic: Wireless
Published: 6/1/2011
Authors: Hamid Gharavi, Yi Ge, Bo Yan, Kairan Sun
Abstract: This paper proposes an effective algorithm for spatial error concealment with accurate edge detection and partitioning interpolation. Firstly, a new method is used for detecting possible edge pixels and their matching pixels around the lost block ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909111

37. A Joint Vehicle-Vehicle/Vehicle-Roadside Communication Protocol for Highway Traffic Safety
Topic: Wireless
Published: 5/1/2011
Author: Hamid Gharavi
Abstract: In this paper, a joint vehicle-vehicle/vehicle-roadside communication protocol is proposed for cooperative collision avoiding in Vehicular Ad Hoc Networks (VANETs). In this protocol, emergency warning messages are simultaneously transmitted via Veh ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908093

38. Diode Power Probe Measurements of Wireless Signals
Topic: Wireless
Published: 4/15/2011
Authors: Catherine A Remley, Hugo Gomes, Alejandro Testera, Nuno Borges Carvalho, Monica Barciela
Abstract: A new view of diode power probes is presented is this paper. It is shown analytically, by simulations and with measurements, that calibration procedures for diode power probes should be rethought when measuring new wireless standard type of signals. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906083

39. Reference Modulation for Calibrated Measurements of Tag Backscatter
Topic: Wireless
Published: 4/14/2011
Authors: Daniel G. Kuester, David R Novotny, Jeffrey R Guerrieri, Randy Direen, Zoya Popovic
Abstract: We present a model and reference backscatter device for calibrating measurements of 860-960 MHz Ultra-High Fre- quency (UHF) tag backscattering. The model relates transmission to and backscattering from the device with a modulation depth calculab ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907507

40. RFID-based Localization and Tracking Technologies
Topic: Wireless
Published: 4/1/2011
Authors: Michael R Souryal, Lionel M. Ni, Dian Zhang
Abstract: 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 deplo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905571



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