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
OG exemplary drawing
 
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

OG Complex Work Unit Drawing
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.