US 7,599,449 B2 · Hybrid modulus blind equalization for quadrature amplitude modulation (QAM) receivers

Abstract

Methods and apparatuses for blind equalizers with a hybrid adaptation error. In one embodiment, a Quadrature Amplitude Modulation (QAM) signal receiver, includes: a filter to reduce error in equalization, the filter to output a QAM signal; a decision engine coupled to the filter to determine a symbol based on the QAM signal; a first error generator coupled to the filter to compute a first error signal based on the QAM signal and a constant; a second error generator coupled to the filter and the decision engine to compute a second error signal based on the QAM signal and the determined symbol; an error combinator coupled to the first and second error generators to generate a combined error signal from the first and second error signals; and an adaptation engine coupled with the error combinator and the filter to reduce a equalization error according to the combined error signal.

Claims20

Dependent claims

A Quadrature Amplitude Modulation (QAM) signal receiver, comprising:

a filter to reduce error in equalization, the filter to output a QAM signal;
a decision engine coupled to the filter to determine a symbol based on the QAM signal;
a first error generator coupled to the filter to compute a first error signal based on the QAM signal and a constant;
a second error generator coupled to the filter and the decision engine to compute a second error signal based on the QAM signal and the determined symbol;
an error combinator coupled to the first and second error generators to generate a combined error signal from the first and second error signals;
and
an adaptation engine coupled with the error combinator and the filter to reduce a equalization error according to the combined error signal.

4 more elements

Dependencies are inferred from the claim text.

Hybrid modulus blind equalization for quadrature amplitude modulation (QAM) receivers

Life of this patent

Hybrid modulus blind equalization for quadrature amplitude modulation (QAM) receivers

Life of this patent

Abstract

Claims20