Sparse equalization filter adaptive in two dimensions

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375232, G06F 1710

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active

057779104

ABSTRACT:
A sparse digital adaptive equalizer including forward and feedback Finite Impulse Response (FIR) filters exhibits improved Least Mean Square operation. A switch assigns one of several multipliers of each filter to any one of the tap locations of that filter. Each multiplier is initially assigned to a preselected tap location with a predetermined weighting coefficient. After completing successive time cycles having a duration equal to a given number of data sample periods, for each filter there is determined (a) a first group of coefficients associated with multipliers then assigned to non-zero value tap locations, and (b) a second group of coefficients associated with multipliers then assigned to zero valued locations. Multipliers associated with first group coefficients during a just-completed time cycle retain their tap locations during the next time cycle. Multipliers associated with second group coefficients during a just-completed time cycle are reassigned to new tap locations for use during the next time cycle.

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patent: 5343522 (1994-08-01), Tatrou et al.
patent: 5528311 (1996-06-01), Lee et al.
patent: 5530485 (1996-06-01), Kim et al.

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