Patent ID: 8472513

Claim:
A method to adapt coefficients of taps of a Finite Impulse Response (FIR) filter to increase elimination of interference from a digital communications signal comprising: transmitting said digital communications signal on a communications channel; eliminating at least a portion of interference introduced into said digital communications signal by passing said digital communications signal through said Finite Impulse Response (FIR) filter to create a FIR filtered signal, said FIR filter having at least one pre/post cursor tap that has a pre/post cursor tap coefficient; passing said FIR filtered signal over said communications channel causing said FIR filtered signal to be distorted by said interference to create a received signal that is passed to a quantifier as a quantifier input signal; quantifying said quantifier input signal with said quantifier into quantifier decisions; calculating an error signal by taking a difference between said quantifier decisions and said quantifier input signal; calculating a pre/post cursor tap coefficient adjustment value for said pre/post cursor tap coefficient of said at least one pre/post cursor tap as a function of said error signal and at least two of said quantifier decisions, said function including a linear combination function on said at least two of said quantifier decisions; sending said pre/post cursor tap coefficient adjustment value to said FIR filter; adjusting said pre/post cursor tap coefficient of said at least one pre/post cursor tap by said pre/post cursor tap coefficient adjustment value in order to adapt said FIR filter to increase elimination of said interference; and, receiving said digital communications signal as said quantifier decisions corresponding to said digital communications signal.