Method of upstream channel modeling for PCM modem

Details Method of upstream channel modeling for PCM modem Method of upstream channel modeling for PCM modem

1997-12-24

1999-03-23

Ghebretinsae, Temesghen

Pulse or digital communications

Transceivers

Modems

375242, H04B 138

Patent

active

058870270

ABSTRACT:
A method is presented to enable high speed transmission in the upstream channel from a customer's modem to a PCM modem connected to the public switched digital network. The upstream channel is equalized by having the client modem send a known training sequence in the upstream direction to the server modem. The server modem calculates the cross-correlation between the known training sequence and the sequence as actually received from the client modem. The cross-correlation is then multiplied by the known auto-correlation of the training sequence to produce a model of the channel response. The channel response is then reported to the client modem so that it may adjust its pre-equalizer to construct the signal that the client modem will thereafter send in the upstream direction.

REFERENCES:
patent: 5005168 (1991-04-01), Cummiskey et al.

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