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Topic Area: Wireless

Displaying records 41 to 50 of 88 records.
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41. A Low Complexity Interference Cancellation Technique for Multi-User DS-CDMA Communications
Topic: Wireless
Published: 5/27/2010
Authors: Wen-Bin Yang, Kamran Sayrafian
Abstract: A low complexity Parallel Interference Cancellation (PIC) technique is proposed to suppress Multi-Access Interference (MAI) and minimize near-far effect for multi-user communication using Direct-Sequence Code Division Multiple Access (DS-CDMA). Inter ...

42. Identifying RF Identification Cards from Measurements of Resonance and Carrier Harmonics
Topic: Wireless
Published: 5/27/2010
Authors: Henry Romero, Catherine A Remley, Dylan F Williams, Chih-Ming Wang, Timothy X. Brown
Abstract: We show that careful measurements of the unloaded resonant frequency and quality factor of radio frequency identification proximity cards allow identification of different card models and, for the set of cards we studied, identification with mini ...

43. A Design Framework for High-Density Wireless Ad Hoc Networks Achieving Cooperative Diversity
Topic: Wireless
Published: 5/24/2010
Authors: Hamid Gharavi, Bin Hu
Abstract: In this paper, we present a systematic design structure for high-density ad hoc networks aimed at achieving full cooperative diversity, based on which the PHY, MAC and Network layers of the system are specifically tailored. For the latter in particul ...

44. The Impact of Long-term Memory Effects on Diode Power Probes
Topic: Wireless
Published: 5/15/2010
Authors: Catherine A Remley, Hugo Gomes, Alejandro Testera, Nuno Borges Carvalho, Monica Barciela
Abstract: This paper presents an analysis of long term memory effects on power measurements using diode power probes. It will be shown that a power probe calibrated with a single-tone sinusoidal excitation can provide erroneous values when used with modulated ...

45. NIST Measurements in the 750 MHz Band to Support Emergency Response Radio Communications
Topic: Wireless
Published: 5/7/2010
Authors: Catherine A Remley, Christopher L Holloway, william f. Young
Abstract: The National Institute of Standards and Technology (NIST) has just released the sixth in a series of NIST technical notes (TN) on radio signal penetration of radio signals in large building structures (apartment complex, hotel, office buildings, spor ...

46. Parametric Study on the use of Reverberation Chambers for Repeatable/Controllable Wireless Testing: Application to BER Measurements
Topic: Wireless
Published: 4/12/2010
Authors: Christopher L Holloway, E Genender, Catherine A Remley, John M Ladbury, Galen H Koepke
Abstract: We illustrate use of the reverberation chamber to simulate different wireless propagation environments including effects such as narrowband or frequency-selective fading and Doppler spread. These effects have a strong impact on the quality of the ...

47. Radio Wave Propagation Into Large Building Structures, Part 2: Characterization of Multipath
Topic: Wireless
Published: 4/2/2010
Authors: Catherine A Remley, Galen H Koepke, Christopher L Holloway, Chriss A. Grosvenor, Dennis G Camell, John M Ladbury, Robert T. Johnk, William F Young
Abstract: We report on measurements that characterize multipath conditions that affect broadband wireless communications in building penetration scenarios. Measurements carried out in various large structures quantify both radio-signal attenuation and frequenc ...

48. Radio Wave Signal Propagation Into Large Building Structures Part 1: CW Signal Attenuation and Variability
Topic: Wireless
Published: 4/2/2010
Authors: Christopher L Holloway, William F Young, Galen H Koepke, Dennis G Camell, Catherine A Remley
Abstract: In this paper, we report on our investigation into radio communications problems faced by emergency responders in disaster situations. A fundamental challenge to communications into and out of large buildings is the strong attenuation of radio si ...

49. Wireless Sensor Network Performance Metrics for Building Applications
Topic: Wireless
Published: 4/1/2010
Authors: Won Suk Jang, William M Healy
Abstract: Metrics are investigated to help assess the performance of wireless sensors in buildings. Wireless sensor networks present tremendous opportunities for energy savings and improvement in occupant comfort in buildings by making data about conditions a ...

50. Measurement Bandwidth Extension Using Multisine Signals: Propagation of Error
Topic: Wireless
Published: 2/6/2010
Authors: Catherine A Remley, Dominique Schreurs, M. Myslinski, Dylan F Williams
Abstract: We describe a post-processing technique that can extend the effective measurement bandwidth of narrowband vector receivers by phase aligning overlapping measurements. The method requires only knowledge of the desired phases of a periodic, multisine e ...

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