DFE to FFE equalization coefficient conversion process for...

Details DFE to FFE equalization coefficient conversion process for... DFE to FFE equalization coefficient conversion process for...

2004-10-27

2008-10-28

Wang, Ted (Department: 2611)

Pulse or digital communications

Equalizers

Automatic

C375S229000, C375S230000, C375S231000, C375S232000

Reexamination Certificate

active

07443914

ABSTRACT:
A method and appartus for converting FFE and FBE coefficients from a DOCSIS compatible cable modem termination system upstream equalizer into FFE only coefficients to be sent down to the cable modem which transmitted the training burst which resulted in convergence on the FFE and FBE coefficients. The method involves programming an FBE like conversion structure comprised of an FFE filter and an FBE filter whose outputs are summed with the FFE and FBE coefficients from the CMTS equalizer. The FFE coefficients are stored in the FFE filter of the conversion structure. The FBE coefficients are stored in an FBE filter of the conversion structure. Then, an input vector which simulates the Dirac function (an impulse) is input to the conversion structure to derive coefficients at its output which define the impulse response and transfer function of the conversion structure. These coefficients are the FFE only coefficients which may be used to select a subset of 24 for sending to the cable modem.

REFERENCES:
patent: 5321512 (1994-06-01), Huang
patent: 6069917 (2000-05-01), Werner et al.
patent: 2004/0120394 (2004-06-01), Miao et al.
International Search Report, International Application No. PCT/US05/37851, date mailed Oct. 12, 2006.

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