Pulse or digital communications – Equalizers – Automatic
Patent
1993-06-16
1996-02-06
Coles, Sr., Edward L.
Pulse or digital communications
Equalizers
Automatic
375229, 333 18, 36472419, 36472420, H03H 730
Patent
active
054901693
ABSTRACT:
A decision feedback equalizer is suitable for use with a bipolar return-to-zero receiver. The equalizer determines an output Y(n) (160) based on a compensated received value X(n) (104) and a correction factor, D(n) (141 ). After receiving X(n), the equalizer retrieves a stored value D(n) corresponding to the k prior output values Y(n-1), . . . , Y(n-k) from a memory device (140). The equalizer then forms an equalized received value X'(n) (107) based on combining X(n) with D(n). The equalizer then determines the output value Y(n) based on comparing X'(n) with a positive threshold, V1 and a negative threshold, V2. When Y(n) is determined to be zero, the equalizer adjusts the stored correction value D(n) by a predetermined value, .DELTA., based on whether X'(n) is positive or negative.
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Cowan, C. F. N., and Grant, P. M. (Editors), Adaptive Filters, 1985, sec. 8.3.1., "Echo Cancellation for WAL2 Transmission," pp. 244-249, Prentice-Hall, Inc., Englewood Cliffs, New Jersey 07632.
Blackwell Steven R.
Goodson Richard L.
Coles Sr. Edward L.
Nguyen Madeleine Au
Universal Data Systems, Inc.
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