REPOSITIONING OF EQUALIZER TAP-GAIN COEFFICIENTS Start-up performance of an automatic transversal equalizer is enhanced when known, but unsynchronized, pseudorandom test words having substantially as many elements as there are equalizer taps are correlated at the receiver location in a digital data transmission system to obtain an ordered set of tap-gain coefficients of sufficient precision to open the received eye pattern. The largest tap-gain coefficient of the ordered set thus derived is rapidly ascertained and aligned with a predetermined reference tap position entirely by digital means. The technique is readily adapted to phasemodulated and quadrature amplitude-modulated data systems where quadrature-related coefficient sets, i.e., the coefficients are complex numbers, are required.
REPOSITIONING OF EQUALIZER TAP-GAIN COEFFICIENTS