Open-loop phase estimation methods and apparatus for coherent de

Details Open-loop phase estimation methods and apparatus for coherent de Open-loop phase estimation methods and apparatus for coherent de

1993-10-05

1995-12-05

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375326, 329306, H04L 2722

Patent

active

054736374

ABSTRACT:
Open-loop phase estimation methods and apparatus for coherent demodulation on mobile channels is disclosed. A PSK RF modulated signal is received, RF demodulated to obtain inphase and quadrature components thereof, and the inphase and quadrature components sampled and digitized periodically to provide inphase and quadrature components of the signal vector. A phase estimator strips the data contribution from each vector, leaving only a phase error measurement related to the true phase error. That phase error indication is averaged over a fixed window of time to determine an average phase estimate applicable to the signal vector at the middle of the window. Resulting one hundred eighty degree ambiguities are resolved, and then the applicable signal vector is phase corrected by the average phase estimate and result of the ambiguity resolution, with the following demodulation being responsive to the phase of the phase corrected signal vector.

REFERENCES:
patent: 4466108 (1984-08-01), Rhodes
patent: 4656648 (1987-04-01), Vallet
patent: 4888793 (1989-12-01), Chanroo et al.
patent: 4912422 (1990-03-01), Kobayashi et al.
1988 IEEE International Symposium on Circuits and Systems, "Digital Implementation of a Coherent CPM System for Mobile Radio" P. Eglin, J. Habermann, D. Dzung (IEEE 1988).
Electronics Letters, "Optimal Averaging Filter Length for Nondecision-Aided Feedforward Carrier Synchroniser" De Jonghe (Engage GB Feb. 1994).

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