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Topic Area: Wireless
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Displaying records 61 to 70 of 96 records.
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61. Representing Bias-Network Baseband Characteristics when Simulating Intermodulation Distortion
Topic: Wireless
Published: 6/15/2009
Authors: Catherine A Remley, C. Michael Olsen, Susan L. Sweeney
Abstract: We demonstrate a method to characterize and represent bias-tees, and other components in the signal path, in an accurate and practical fashion in circuit simulations. The method involves measuring S-parameters of the bias-tee, other surrounding circu ...

62. Practical Applications of Nonlinear Measurements
Topic: Wireless
Published: 6/12/2009
Author: Catherine A Remley
Abstract: We discuss the limitations of vector network analyzers in the measurement of nonlinear devices and circuits, including their inability to measure the relative phase between frequency components and the actual impedance in which a device is embedded. ...

63. Measurements in Harsh RF Propagation Environments to Support Performance Evaluation of Wireless Sensor Networks
Topic: Wireless
Published: 6/5/2009
Authors: Catherine A Remley, Galen H Koepke, Christopher L Holloway, Dennis G. Camell, Chriss A. Grosvenor
Abstract: We describe common performance evaluation methods for wireless devices, including wireless sensors, and how measurements of real-world propagation environments are used to support the evaluation process. We then present representative measurement dat ...

64. Comparison of QPSK and 64QAM EVM for an OFDM WLAN Signal at 2.4 GHz and 4.9 GHz in a Multipath Environment
Topic: Wireless
Published: 6/1/2009
Authors: Catherine A Remley, Michael McKinley, J. S. Kenney, M. Myslinski, Galen H Koepke, Dennis G. Camell, Robert Johnk
Abstract: In this work, we verify experimentally the consistency of EVM across modulation types of orthogonal frequency-division multiplexed (OFDM) signals in two dedicated lab setups. We compared EVMs obtained for different modulation types both in an idealiz ...

65. Electromagnetic Measurements for Counterfeit Detection of Radio-Frequency Identification Cards
Topic: Wireless
Published: 5/2/2009
Authors: Henry Romero, Catherine A Remley, Dylan F Williams, Chih-Ming Wang
Abstract: We investigate a technique for counterfeit detection of radio-frequency identification cards based on the electromagnetic characteristics of the cards rather than the digital information that they transmit. We describe a method of measuring the elect ...

66. The IMS 2009 "Bonus Issue"
Topic: Wireless
Published: 5/1/2009
Author: Catherine A Remley
Abstract: This is an Editorial for a special issue of IEEE Microwave Magazine devoted to the International Microwave Symposium. Kate Remley, the Editor-in-Chief, and two co-editors write about this issue.

67. Editorial for the February, 2009 issue of IEEE Microwave Magazine
Topic: Wireless
Published: 2/2/2009
Author: Catherine A Remley
Abstract: An editorial for the February 2009 issue of IEEE Microwave Magazine by Kate Remey, the Editor in Chief.

68. Radio Frequency and Analog/Mixed-Signal (RF and AMS) Technologies for Wireless Communications
Topic: Wireless
Published: 1/5/2009
Authors: Herbert S Bennett, Margaret Huang, John J. Pekarik
Abstract: The challenges facing the RF and AMS community as represented by the International Technology Roadmap for Semiconductors are summarized in this paper.

69. Low probability of detection underwater acoustic communications using direct-sequence spread-spectrum
Topic: Wireless
Published: 12/1/2008
Authors: Wen-Bin Yang, T.C. Yang
Abstract: Direct-sequence spread-spectrum underwater acoustic communications are analyzed in this paper between communication nodes, at least one of which is moving. At-sea data are analyzed which show that the phase change due to source motion is significant. ...

70. Diversity Performance of a Practical Non-Coherent Detect-and-Forward Receiver
Topic: Wireless
Published: 11/30/2008
Authors: Michael R Souryal, Huiqing You
Abstract: We propose a non-coherent receiver for the fixed detect-and-forward relay channel and derive a closed-form tight upper bound on its bit error probability in Rayleigh fading channels. Using this upper bound, we show that the receiver achieves nearly ...

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