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An adaptive all-pass filter for decision feedback equalizationWiedmann, Ralf 06 March 1997 (has links)
Increasing densities on magnetic data storage devices leads to problems of
severe intersymbol interference (ISI), additive noise and non-linearities. Advanced
detection strategies for magnetic recording channels fall into two categories: partial
response equalization with maximum likelihood decoding and decision feedback
equalization. This study focuses on doing an adaptive all-pass forward filter for
the decision feedback channel. The decision feedback channel can be equalized by
a low-order continuous-time filter, and does not require a transversal filter with
high-precision multiplication. This results in considerable savings in both power
consumption and chip die area. One problem that has yet to be addressed is how to
adaptively set the coefficients of the all-pass filter. This thesis examines the design
and performance of an adaptive all-pass filter.
The performances in terms of the mean-squared error (MSE) of a first- and
second-order all-pass are evaluated. They are compared to a conventional FIR filter
design of various lengths. An adaptive algorithm based on the least mean-squared
(LMS) error is developed and characterized over a range of storage densities. Since
this does not require sampling of the filter input or any states of the forward filter, the system could be realized in continuous-time up to the decision device.
Numerical simulations for various data densities and noise variances are done to verify the theoretically expected performance and the adaptation behavior of the all-pass. / Graduation date: 1997
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Efficient arithmetic using self-timingRamachandran, Ravichandran 02 September 1994 (has links)
The recent advances in VLSI technology have facilitated feature shrinking
and hence a rapid increase in the levels of integration at the chip level. This increase
in the level of integration has brought along with it a host of other constraints, the
most crucial being timing management and increased power dissipation. Such
constraints potentially prevent the full exploitation of the increased processing power
made possible by technological advances.
Timing in complex digital systems has traditionally been managed by using
a global clock, controlled by which all the actions take place in lock-step. An alternative
means of managing timing, called self-timing, simplifies the problems of timing management
and results in a reduced power dissipation of complex digital systems. Systems
designed using this self-timed or asynchronous protocol, work on a principle of handshaking,
running at their own speed, governed by local timers and the availability
of data on which to work. However, this hand-shaking introduces an overhead both
in terms of hardware and computational speed.
The work presented here examines the implementation of an adder, called
a Parallel Half-Adder (PHA), which gains its speed by exploiting the power of asynchrony to calculate the sum. The adder has been implemented in the form of a tunable
micropipeline and compared to traditional adders in terms of hardware complexity
and speed. Comparable results have been obtained, implying that the overhead due
to hand shaking is justified and the performance improvements due to self-timing
can be fully exploited. The design of an array divider using the PHA has also been
presented. / Graduation date: 1995
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A basis for a command, control and communications (C3) system architecture for the Argentine Army /Maidana, Juan Carlos. January 1990 (has links) (PDF)
Thesis (M.S. in Telecommunications Systems Management)--Naval Postgraduate School, March 1990. / Thesis advisor(s): Boger, Dan C. Second Reader: Tulloch, A.W. "March 1990." Description based on signature page as viewed on August 25, 2009. Author(s) subject terms: Command, control, and communications systems. Includes bibliographical references (p. 49-52). Also available online.
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An automated virtual tool to compute the entire set of proportional integral derivative controllers for a continuous linear time invariant systemNarasimhan, Bharat 15 May 2009 (has links)
This thesis presents the very practical and novel approach of using the Graphical User
Interface (GUI) to compute the entire set of Proportional Integral Derivative (PID)
controllers given the transfer function or the frequency response of the system under
consideration.
Though there is a wide spread usage of PID controllers in the industry, until
recently no formal algorithm existed on determining a set of PID values that will
stabilize the given system. The industry still relies on algorithms like the Ziegler-
Nicholas or ad-hoc approaches in determining the value of PID controllers. Also
when it comes to model free approaches, the use of Fuzzy logic and Neural network
do not guarantee stability of the system.
For a continuous Linear Time Invariant system Bhattacharyya and others have
developed an algorithm that determines the entire set of PID controllers given the
transfer function or just the frequency response of the system. The GUI has been
developed based on this theory. The GUI also evaluates the user input performance
specifications and generates a subset of stable controllers given the performance criteria for the system.
This thesis presents an approach of automating the computation of entire set of stabilizing Proportional Integral Derivative (PID) controllers given the system
transfer function or the frequency response data of the system. The Graphical User
Interface (GUI) developed bridges the gap between the developed theory and the
industry.
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An automated virtual tool to compute the entire set of proportional integral derivative controllers for a continuous linear time invariant systemNarasimhan, Bharat 10 October 2008 (has links)
This thesis presents the very practical and novel approach of using the Graphical User
Interface (GUI) to compute the entire set of Proportional Integral Derivative (PID)
controllers given the transfer function or the frequency response of the system under
consideration.
Though there is a wide spread usage of PID controllers in the industry, until
recently no formal algorithm existed on determining a set of PID values that will
stabilize the given system. The industry still relies on algorithms like the Ziegler-
Nicholas or ad-hoc approaches in determining the value of PID controllers. Also
when it comes to model free approaches, the use of Fuzzy logic and Neural network
do not guarantee stability of the system.
For a continuous Linear Time Invariant system Bhattacharyya and others have
developed an algorithm that determines the entire set of PID controllers given the
transfer function or just the frequency response of the system. The GUI has been
developed based on this theory. The GUI also evaluates the user input performance
specifications and generates a subset of stable controllers given the performance criteria for the system.
This thesis presents an approach of automating the computation of entire set of stabilizing Proportional Integral Derivative (PID) controllers given the system
transfer function or the frequency response data of the system. The Graphical User
Interface (GUI) developed bridges the gap between the developed theory and the
industry.
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On performance assessment of feedback control loops /Ko, Byung-su, January 2000 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2000. / Vita. Includes bibliographical references (leaves 174-179). Available also in a digital version from Dissertation Abstracts.
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Pulse modulation control for flexible systems under the influence of nonlinear friction /Rathbun, David. January 2001 (has links)
Thesis (Ph. D.)--University of Washington, 2001. / Vita. Includes bibliographical references (p. 127-133).
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Autonomous abstraction of policies based on policy homomorphismRajendran, Srividhya. January 2009 (has links)
Thesis (Ph.D.)--University of Texas at Arlington, 2009.
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Evolution-based path planning and management for autonomous vehicles /Capozzi, Brian Joseph. January 2001 (has links)
Thesis (Ph. D.)--University of Washington, 2001. / Vita. Includes bibliographical references (p. 253-265).
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Modeling single-event transients in complex digital systems /Clark, Kenneth A. January 2002 (has links) (PDF)
Thesis (Ph. D.)--Naval Postgraduate School, 2002. / Thesis advisor(s): Herschel H. Loomis, Jr., Alan A. Ross. Includes bibliographical references (p. 157-161). Also available online.
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