Patent ID: 7151797

Claim:
In combination: a pulse-amplitude-modulation (PAM) receiver for supplying digital samples of a baseband demodulation response to the pulse amplitude modulation of a selected radio-frequency carrier, which pulse amplitude modulation provides symbol coding of digital data; a K-factor-improvement filter having a sparse kernel with two non-zero weighting coefficients of substantially equal amplitudes, the respective polarities of which said two non-zero weighting coefficients are adjustable and the differential delay between which said two non-zero weighting coefficients is adjustable, said K-factor-improvement filter connected for supplying its K-factor-improvement filter response to said digital samples of said baseband demodulation response supplied by said PAM receiver; adaptive equalization filtering connected for supplying an equalized baseband response to said K-factor-improvement filter response, said equalized baseband response comprising baseband symbol coding of said digital data; decoding apparatus connected for reproducing said digital data by decoding said baseband symbol coding in said equalized baseband response; apparatus connected for measuring the channel impulse response (CIR) or cepstrum of the signal as received and supplying a measured CIR; and a filter coefficients computer connected for responding to said measured CIR, to adjust the respective polarities of said two non-zero weighting coefficients of said K-factor-improvement filter, and to adjust the differential delay between said two non-zero weighting coefficients of said K-factor-improvement filter.