Patent ID: 6320904
Filing Date: 2001-11-20
Classification: H04L

Abstract:
A blind convergence process for an adaptive decision feedback equalizer having a quadrature amplitude modulation (QAM) slicer, a forward filter defined by a plurality of forward tap coefficients and a feedback filter defined by a plurality of feedback tap coefficients, said blind convergence process comprising the steps of:(a) performing a clustering process comprising:(a1) updating the forward tap coefficients of the forward filter using an estimated error derived using a blind equalization algorithm, and(a2) updating the feedback tap coefficients of the feedback filter also using an estimated error derived using a blind equalization algorithm; and(b) initiating a decision directed process comprising:(b1) updating the forward tap coefficients of the forward filter for a prescribed QAM index n, and(b2) updating the feedback tap coefficients of the feedback filter for a prescribed QAM index n.