Phase-locked loop initialization via curve-fitting

Details Phase-locked loop initialization via curve-fitting Phase-locked loop initialization via curve-fitting

2006-01-31

2006-01-31

Chin, Stephen (Department: 2634)

Pulse or digital communications

Receivers

Angle modulation

C375S215000, C375S294000, C375S373000, C375S376000, C375S326000

Reexamination Certificate

active

06993095

ABSTRACT:
A method and apparatus for accurately estimating the carrier frequency offset and the carrier phase offset of a digitally modulated signal using a signal processing algorithm to initialize the state variables of a Phase-Locked Loop (PLL) is disclosed. A sequence of phase values is estimated from a received sequence of symbols and the angular effect due to the modulation format is removed from the sequence of phase values. A curve-fit algorithm based in one embodiment on the RLS algorithm is then applied to a sequence of unwrapped phase values to estimate the carrier frequency offset and the carrier phase offset.

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