An asynchronous, single-chip, LMS based, adaptive fir echo canceller
Author
Mackey, Richard PaulIssue Date
1995Advisor
Rodriguez, Jeffrey J.
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The University of Arizona.Rights
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.Abstract
An asynchronous, single-chip, high-speed communication adaptive echo canceller was developed during this research. Adaptation is based on the LMS algorithm with power-of-two convergence factor. Cancellation is performed by a 128-coefficient adaptive finite impulse response filter whose coefficients are updated every cycle. The LMS power-of-two update equations were modified to allow a pipelined implementation. Pipelining the adaptation and echo estimation operations enabled hardware minimization, a high sampling rate, and no increase in convergence time. The resulting circuit updates the filter coefficients and generates the output at a sampling rate greater than 205 kHz. The chip was designed using 0.8 mum CMOS standard cells. The single-chip layout requires a die size of 9.25 mm by 7.25 mm.Type
textThesis-Reproduction (electronic)
Degree Name
M.S.Degree Level
mastersDegree Program
Graduate CollegeElectrical and Computer Engineering