| 摘要 |
PCT No. PCT/FI95/00598 Sec. 371 Date Apr. 30, 1997 Sec. 102(e) Date Apr. 30, 1997 PCT Filed Oct. 30, 1995 PCT Pub. No. WO96/13908 PCT Pub. Date May 9, 1996In a method for establishing a data communication connection in a data channel utilizing PAM signals, a transmitter transmits a training sequence, formed of predetermined symbols, a predetermined number of times. The data channel is monitored in order to detect a predetermined signal, samples are taken and amplification is adjusted in such a way that the signal, settle at a predetermined level. In order that the method can be applied in a data channel with previously unknown properties, when the transmitter starts repeating the training sequence, samples taken from the data channel are buffered to form a sample sequence. A channel pulse response estimate is calculated by convoluting the buffered samples with a predetermined symbol sequence. A main sample is selected, correction coefficients are calculated on the basis of the samples preceding and following the main sample, and, when the transmitter starts transmitting data, the samples taken from the data channel are corrected by utilizing the correction coefficients.
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