Method of compensating differences in group propagation times be

Details Method of compensating differences in group propagation times be Method of compensating differences in group propagation times be

1997-01-28

1998-08-04

Chin, Wellington

Pulse or digital communications

Systems using alternating or pulsating current

375324, 375340, 329304, 329305, H04L 2700

Patent

active

057906009

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 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: 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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Kuang-Tsan Wu et al, "256-QAM Modem Performance in Distorted Channels", IEEE Transactions on Communications, vol. 33, No. 5, May 1985, New York, US, pp. 487-491.
Gardner, "A BPSK/QPSK timing-error detector for sampled receivers", IEEE Transactions on Communications, vol. 34, No. 5, May 1986, New York, US pp. 423-429.

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