Minimization of phase equivocation in burst modems

Details Minimization of phase equivocation in burst modems Minimization of phase equivocation in burst modems

2006-03-14

2006-03-14

Vo, Don N. (Department: 2631)

Pulse or digital communications

Receivers

Angle modulation

C375S346000

Reexamination Certificate

active

07012972

ABSTRACT:
In a system comprising a subscriber (sub) carrier tracking loop and a hub carrier tracking loop, a method and apparatus for resolving phase equivocation. The method comprises the following steps: (A) acquiring a phase and a frequency of a hub carrier frequency by utilizing the sub carrier tracking loop; (B) estimating an instant absolute frequency offset between a received symbol point and a corresponding plant point; (C) averaging the instant absolute frequency offset over a plurality of received symbols; (D) storing the averaged estimated frequency offset in a frequency register of the sub carrier tracking loop; (E) locking the sub carrier tracking loop on the hub carrier frequency by compensating for the stored averaged estimated frequency offset; (F) estimating an instant absolute phase error between a received symbol point and a corresponding plant point; (G) averaging the instant absolute phase error over a plurality of received symbols; (H) resolving phase equivocation by adjusting the averaged absolute phase error, if the averaged absolute phase error is at least equal to a predetermined equivocation phase threshold; and (I) completing the tracking of the hub carrier frequency by the locked sub carrier tracking loop.

REFERENCES:
patent: 5638361 (1997-06-01), Ohlson et al.
patent: 5706048 (1998-01-01), Davis
patent: 5757847 (1998-05-01), Durrant et al.
patent: 6650649 (2003-11-01), Muhammad et al.
patent: 6952399 (2005-10-01), Bayerl et al.

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