Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2005-10-18
2005-10-18
Bocure, Tesfaldet (Department: 2631)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S232000
Reexamination Certificate
active
06956917
ABSTRACT:
An optoelectronic assembly for reducing interference in an optical data stream received over a channel includes a converter, an equalizer, a microcontroller, and a comparator. The converter converts the optical data stream to an electrical signal. The equalizer, including a set of filter coefficients, filters the electrical data stream and generates a filtered signal. The comparator compares the filtered signal against a threshold value to generate a set of data values. The microcontroller includes: logic for generating one or more correlation statistics, where each correlation statistic reduces data components of the electrical signal; logic for estimating a channel response reflecting dispersion in the channel, based at least in part on the one or more correlation statistics; logic for determining the set of filter coefficients for the equalizer; and logic for adaptively updating the set of filter coefficients to reflect time-varying changes in the channel response.
REFERENCES:
patent: 5572552 (1996-11-01), Dent et al.
Numerical Recipes in Fortran 77: The Art of Scientific Computing, Second Edition,William H. Press, Saul A. Teukolsky, William T. Vetterling, and Brian P. Flannery, Cambridge University Press: Cambridge, UK (1992), pp. 340-386 and pp. 387-448.
Matrix Computations, Third Edition,Gene H. Golub and Charles F Van Loan, The Johns Hopkins University Press: Baltimore, MD (1996), pp. 87-132, pp. 193-205, and pp. 508-554.
Digital Communication, Second Edition,Edward A. Lee and David G. Messerschmitt, Kluwer Academic Publishers: Boston, MA (1994), pp. 737-764.
Bocure Tesfaldet
Finisar Corporation
Workman Nydegger
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