Method and apparatus for increasing the quality of the...

Details Method and apparatus for increasing the quality of the... Method and apparatus for increasing the quality of the...

2008-04-15

2008-04-15

Corrielus, Jean B (Department: 2611)

Pulse or digital communications

Synchronizers

Reexamination Certificate

active

10433402

ABSTRACT:
The invention relates to a method and apparatus for improving the quality of receiver synchronization on QAM- or CAP-modulated modem connections having an adaptive linear equalizer. The invention is based on the finding that in a QAM- or CAP-modulated data transmission system where the symbol rate and the average carrier frequency are in fixed relationship with each other, the vector formed by the In-phase and the Quadrature component of the detector input signal rotates with the timing phase shift of the receiver. The quality of receiver synchronization is improved by utilizing information extracted from the vector rotation.

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