Apparatus for adaptive resolution of phase ambiguity value

Details Apparatus for adaptive resolution of phase ambiguity value Apparatus for adaptive resolution of phase ambiguity value

2007-02-13

2007-02-13

Ghebretinsae, Temesghen (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

C375S130000, C375S279000, C375S327000

Reexamination Certificate

active

10412829

ABSTRACT:
An apparatus for resolution of phase ambiguity is disclosed. The apparatus receives a modulated signal and resolves a phase ambiguity of the modulated signal while recovering the modulated signal to original data, wherein the apparatus includes a phase ambiguity detector for receiving demodulated data and frame synchronization information, and detecting a phase ambiguity value from the demodulated data based on a frame synchronization information; a phase ambiguity eliminator for receiving the phase ambiguity value and the demodulated data, and generating a phase ambiguity eliminated data by inverting the phase ambiguity value and multiplying the inverted phase ambiguity value and the demodulated data. The present invention can resolve a phase ambiguity occurred in various modulation modes including a burst mode communication with the same algorithm so it can effectively be implemented to an adaptive MODEM.

REFERENCES:
patent: 5025455 (1991-06-01), Nguyen
patent: 5822339 (1998-10-01), Hart
patent: 6304614 (2001-10-01), Abbaszadeh et al.
patent: 6625197 (2003-09-01), Lundby et al.
IEEE Transactions on Communications, vol. 38, No. 12, Dec. 1990, pp. 2087-2088.

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