Method and apparatus for combatting ingress and multipath in a C

Details Method and apparatus for combatting ingress and multipath in a C Method and apparatus for combatting ingress and multipath in a C

1996-04-29

1999-03-09

Flynn, Nathan J.

Telecommunications

Interference signal transmission

348 12, H04N 710

Patent

active

058813632

ABSTRACT:
In a CATV return channel between a transmitter and a headend receiver, the transmitter is provided with a precoder having programmable but fixed coefficients. The receiver is provided with an ingress rejection filter (IRF) having programmable but fixed coefficients. A non-precoded training sequence is sent from the transmitter to the receiver during a training interval. A multipath and an ingress in the CATV return channel are estimated at the receiver based upon the training sequence sent by the transmitter and received by the receiver. The precoder coefficients and the IRF coefficients are calculated and the precoder and the ingress rejection filter are programmed with the calculated coefficients, respectively. The precoder and the ingress rejection filter use the respective calculated coefficients during a data transmission interval to simultaneously compensate for undesirable effects of multipath and ingress noise in the CATV return channel during data transmission from the transmitter to the headend.

REFERENCES:
patent: 3750022 (1973-07-01), Curry et al.
patent: 5126840 (1992-06-01), Dufresne et al.
Eldering et al., "Engineering Requirements for Hybrid Fiber-Coax Telephony Systems", 1994 National Cable Television Association Show, May 1994.

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