H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/74
H04L 12/52 (2006.01) H04B 1/16 (2006.01) H04B 3/23 (2006.01) H04L 25/03 (2006.01) H04L 27/01 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 1338383
A receiver for a digital data transmission system comprises a sampling device for sampling digital data signals received from a subscriber loop. A precursor equalizer connected to the output of the sampling device equalizes, in effect filters, the sampled digital data signal. A timing recovery circuit connected to the output of the precursor equalizer controls the sampling device in dependence upon the filtered digital data signal. The precursor equalizer has a difference equation such that the equalized digital data signal has at least one zero-crossing occurring substantially one baud before the main cursor of each pulse. For twisted wire pair subscriber loops, the precursor equalizer may have a difference equation: w(n)= Image which produces a single precursor zero-crossing. Alternatively, the precursor equalizer may have a difference equation: w(n)= Image which produces two precursor zero crossings, y(n) being the input to the filter, w(n) its output, ho the main cursor height before equalization and h-1 the precursor height before equalization. The latter precursor equalizer may be modified by multiplying each of the coefficients (h-1/h0)2 and h-1/h0 by a factor .delta. = Image to define the zero crossing more precisely. A (1-Z-1) filter may be provided ahead of the precursor equalizer. 38
601414
Aly Sami Abdel Hamid
Sayar Babak
Adams Thomas
Aly Sami Abdel Hamid
Nortel Networks Limited
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