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Topic Area: Telecommunications
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Displaying records 11 to 19.
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11. Producing known complex modulation signals for calibration of optical modulation analyzers
Topic: Telecommunications
Published: 3/4/2012
Authors: Tasshi Dennis, Bernd Nebendahl
Abstract: A family of optical modulation signals with known properties was generated using three phase-locked lasers for calibration of the complex measurement plane. Patterns predicted from first principles were measured with a real-time optical modulatio ...

12. High-Accuracy Photoreceiver Frequency Response Measurements at 1.55 um by Use of a Heterodyne Phase-Locked Loop
Topic: Telecommunications
Published: 9/29/2011
Authors: Tasshi Dennis, Paul D Hale
Abstract: We demonstrate a high-accuracy heterodyne measurement system for characterizing the magnitude of the frequency response of high-speed 1.55 µm photoreceivers from 2 MHz to greater than 50 GHz. At measurement frequencies below 2 GHz, we employ a phase- ...

13. The Reverberation Chamber's Unstirred Field: A Validation of the Image Theory Interpretation
Topic: Telecommunications
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 ...

14. Pixel Interlacing Based Video Transmission for Low-complexity Intra-frame Error Concealment
Topic: Telecommunications
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 ...

15. Selective Pixel Interpolation for Spatial Error Concealment
Topic: Telecommunications
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 ...

16. Modeling Smart Grid Applications with Co-Simulation
Topic: Telecommunications
Published: 10/5/2010
Authors: Timothy Godfrey, Mullen Sara, Roger C. Dugan, Craig Rodine, David Wesley Griffith, Nada T Golmie
Abstract: Analysis of complex Smart Grid applications require simulation of communications networks and the power system. Analytical models of the communication systems provide a tool for examining the aggregate behavior of the system. An event level analysis ...

17. A Novel Ring-Based Performance Analysis for Call Admission Control in Wireless Networks
Topic: Telecommunications
Published: 4/30/2010
Authors: Duk Kyung Kim, David Wesley Griffith, Nada T Golmie
Abstract: In Orthogonal Frequency Division Multiplex (OFDM) wireless networks such as 3GPP LTE and IEEE 802.16 WiMAX, the scheduler should allocate more resources to users with lower channel quality, such as users near the edge of the Base Station (BS) coverag ...

18. Full PMD vector measured directly from modulated data using linear optical sampling
Topic: Telecommunications
Published: 7/15/2009
Authors: Paul A Williams, Tasshi Dennis
Abstract: We demonstrate a new technique to monitor the polarization-mode dispersion in a fiber communication channel by analyzing the modulated data at the fiber output measured with Polarization-Sensitive Linear Optical Sampling (PS-LOS).

19. Report of the NIST Workshop on Key Escrow Encryption
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 5468
Topic: Telecommunications
Published: 6/1/1994
Authors: A Oldehoeft, Dennis Keith Branstad
Abstract: On June 10, 1994, the National Institute of Standards and Technology (NIST) hosted a one-day workshop to present and discuss key escrow encryption technology, including the recently-approved Escrowed Encryption Standard (EES), Federal Information Pro ...

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