H - Electricity – 04 – B
Patent
H - Electricity
04
B
340/72
H04B 15/00 (2006.01) H04B 3/23 (2006.01)
Patent
CA 1191224
ABSTRACT OF THE DISCLOSURE A method and an apparatus, in a telecommunication sys- tem for transmission of digital information in duplex over a signal conductor pair for automatically adjusting a balance filter included in a hybrid coupler circuit with the aid of adaptive echo cancellation so that the local data trans- mitter does not disturb the local data reception, without utilizing any particular testing procedure in initiating the adaptive echo cancellation. A control signal is formed which with the help of which the correction unit, is caused to generate signals for rapid updating of the balance filter parameters, in spite of the fact that knowledge is locking in the initiation instant concerning the valve of the sig- nal transmitted from the remote end to the apparatus, and that no counteraction between level correction and filter adaption is obtained. The apparatus includes a quantizer in which a sampled, received signal is quantized and an estimated signal of data sent from the remote end is obtain- ed. The estimated signal is multiplied by a reference sig- nal from a reference unit, the result being subtracted from the received signal so that an error signal is formed. The sign of the error signal is correlated with the estimated signal in a correction unit, which calculates a correction to be added to the reference signal in order to correct it. The sign of the error signal is also added to the estimated signal thereby forming said control signal which is corre- lated with the data vector in the correction unit. This unit calculates a correction value which is supplied to the input of the balance filter for correction of the filter parameters.
414564
Carlqvist Bengt
Svensson Tommy
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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