Method of compensating differences in group propagation times between the analog filters of a transmitter and between those of a receiver for signals in phase quadrature corresponding compensation apparatus and a corresponding transmission system
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United States of America Patent
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Aug 4, 1998
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N/A
app pub date -
Jan 28, 1997
filing date -
Jan 29, 1996
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Expired
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Abstract
The invention relates in particular to a method of compensating differences in group propagation times between first and second analog filters of a transmitter of signals in phase quadrature, and between third and fourth analog filters of a receiver of signals in phase quadrature. The method consists in: applying the output signals from the first and second filters respectively to the third and fourth analog filters so as to measure a time difference .DELTA.1 equal to: ?Tx+Rx!-?Ty+Ry! where Tx, Rx, Ty, and Ry are respective propagation times for the signals through the first, second, third, and fourth filters; applying the output signals from the first and second filters respectively to the fourth and third analog filters so as to measure a time difference .DELTA.2 equal to: ?Ty+Rx!-?Tx+Ry! and determining weighting coefficients from the differences .DELTA.1 and .DELTA.2 for application to digital filters in series with said analog filters so as to compensate the group propagation time differences respectively between the first and second analog filters and between the third and fourth analog filters.
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