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Damping and dispersion of twisted-pair transmission line and a compensation method to improve location of impedance discontinuities.

Ross, Rebecca W. (2009) Damping and dispersion of twisted-pair transmission line and a compensation method to improve location of impedance discontinuities. Master's Thesis, University of Pittsburgh. (Unpublished)

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In this thesis, a method to compensate for propagation effects in twisted-pair transmission lines is developed, with a goal of improving the location of impedance discontinuities in the line. There are many methods to locate impedance discontinuities, among them are single-ended measurements using frequency domain reflectometry (FDR), which is the focus of this work. With FDR, one transmits a steady-state tone or tones onto the line, then measures the amplitude and phase difference of the tone at the receiver relative to the transmit tone. Propagation effects of the line, especially damping and dispersion, which are generally unknown, can negatively impact the performance of FDR methods, making identification of impedance discontinuities difficult.A method is presented to compensate for the damping without requiring a priori knowledge of the cable type and length. In the absence of impedance mismatches between the source and the line, the compensation method improves impedance discontinuity location. Performance of the method degrades considerably when there is an impedance mismatch, but a procedure to compensation for this effect is presented. This compensation requires an assumption of the initial cable type and impedance of test equipment's connecting path. Results are presented on simulations and field data to quantify the performance of the method and identify benefits and limitations.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Ross, Rebecca W.rwr7@pitt.eduRWR7
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairLoughlin, Patrick Jloughlin@pitt.eduLOUGHLIN
Committee MemberEl Nokali, Mahmoudmen@pitt.eduMEN
Committee MemberEl-Jaroudi, Amroamro@pitt.eduAMRO
Date: 28 January 2009
Date Type: Completion
Defense Date: 21 November 2008
Approval Date: 28 January 2009
Submission Date: 6 November 2008
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Electrical Engineering
Degree: MSEE - Master of Science in Electrical Engineering
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: damping and dispersion; FDR; twisted-pair cable
Other ID:, etd-11062008-185155
Date Deposited: 10 Nov 2011 20:04
Last Modified: 15 Nov 2016 13:51


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