Multiple channel control using orthogonally modulated coded driv

Details Multiple channel control using orthogonally modulated coded driv Multiple channel control using orthogonally modulated coded driv

1998-03-17

2000-12-26

Ngo, Ricky

Multiplex communications

Generalized orthogonal or special mathematical techniques

370208, H04B 7216

Patent

active

061670243

ABSTRACT:
An orthogonal pilot tone servo controller provides a servo control loop for each tap in a delay line processor where each servo acquires its independence from the other tap's servos utilizing an orthogonal code set modulated on top of the existing tap values. The orthogonal codes are attenuated in amplitude such that the code sets are transparent to the processed signals of interest, but the code's length enables each tap's servo controller to independently recover the tap's state from the aggregate of signals and codes through processing gain realized in each loop's recovery circuit. A plurality of taps can be thus be servo controlled simultaneously, providing for extremely wide bandwidth processes which can be performed accurately with digital controls.

REFERENCES:
patent: 5414699 (1995-05-01), Lee
patent: 5598428 (1997-01-01), Sato
patent: 5687162 (1997-11-01), Yoshida et al.
patent: 5694388 (1997-12-01), Sawahashi et al.
patent: 5734647 (1998-03-01), Yoshida et al.
patent: 5757845 (1998-05-01), Fukawa et al.

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