Patent ID: 7656945
Filing Date: 2010-02-02
Classification: H04L

Abstract:
1. An apparatus for adaptively compensating for impairments in a transmission channel, the apparatus comprising: an analog-to-digital converter, wherein the analog-to-digital converter is configured to sample an input signal from the transmission channel and to provide a digital output of the input signal; an adaptive equalizer implemented in the digital domain by a digital filter, wherein the equalizer has a band-pass filter characteristic, wherein the adaptive equalizer is configured to receive a digital signal as an input, wherein the digital signal is at least based on the digital output of the analog-to-digital converter, wherein the digital filter comprises a finite impulse response (FIR) filter having three or more FIR filter coefficients, wherein odd coefficients of the FIR filter are nonzero and adaptively adjusted, and wherein even coefficients of the FIR filter are zero or nearly zero regardless of the adjustments to the odd coefficients; and a timing recovery circuit operatively coupled at least to an output of the adaptive equalizer, wherein the timing recovery circuit is configured to adjust sampling timing of the analog-to-digital converter.