Patent ID: 6859492
Filing Date: 2005-02-22
Classification: H03H,H04L

Abstract:
1. An adaptive equalizer in a demodulator for an information signal without a training sequence, comprising: filter that generates a filter output signal in response to the information signal according to a transfer function for the filter wherein the transfer function is determined by a set of filter coefficients; coefficient generator that adapts the filter by updating the filter coefficients in response to a selected error signal; error generator that generates a first error signal using an error determination that is preselected for adapting the filter coefficients in response to a relatively large error in the filter output signal; error generator that generates a second error signal using an error determination that is preselected for adapting the filter coefficients in response to a relatively small error in the filter output signal; circuit that provides the selected error signal to the coefficient generator by selecting among the first and second error signals in response to an SNR ratio of a signal power of an output signal of the demodulator to a signal power of a noise level in the output signal.