| 摘要 |
PURPOSE: A TLLS adaptive filter which is implement with one or more input-weighted TLLS FIR filters, or with only a forward TLLS FIR filter or with only a feedback TLLS FIR filter is provided. CONSTITUTION: 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 first group of coefficients associated with multipliers then assigned to non-zero value tap locations, and 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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