US 7,321,618 B2 | ||
PCM upstream data transmission server | ||
Cory Samuel Modlin, Chevy Chase, Md. (US) | ||
Assigned to Texas Instruments Incorporated, Dallas, Tex. (US) | ||
Filed on Apr. 09, 2002, as Appl. No. 10/118,377. | ||
Prior Publication US 2003/0189976 A1, Oct. 09, 2003 | ||
Int. Cl. H03H 7/40 (2006.01); H03K 5/159 (2006.01) |
U.S. Cl. 375—229 [375/240.02; 375/240.29; 375/240.03; 375/240.04] | 11 Claims |
1. A method for pulse code modulation upstream data transmissions in a network between a client and a server comprising:
performing a channel identification to obtain a channel length v and a channel estimate;
calculating a client transmit upstream equalizer in closed form using a decision-feedback filter solution that jointly optimizes
an amount of intersymbol interference and a transmit power; and
identifying an error signal in said equalizer with filters w and b within said equalizer with formula
![]() where w and b are finite length row vectors of length nff and nfb, respectively, nff and nfb≧1, H is a Toeplitz channel matrix (nff×nff+v−1), uk is a vector of data input samples of length nff+v−1, uk−Δ is a length nff vector of input samples delayed by Δ, and k is an integer.
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