Robust scalable and adaptive frequency estimation and frequency tracking for wireless systems

摘要

Methods and apparatuses to determine a frequency adjustment in a mobile wireless device are disclosed. A method includes determining a coarse frequency error estimate and multiple fine frequency error estimates; selecting at least one candidate fine frequency error estimate having a frequency value closest to a corresponding frequency value for the coarse frequency error estimate; and determining a frequency adjustment based on a combination of the coarse frequency error estimate and the selected at least one candidate fine frequency error estimate. In an embodiment, the method further includes calculating a confidence metric for the coarse frequency error estimate; when the confidence metric exceeds a threshold value, determining the frequency adjustment based on the candidate fine frequency error estimate; otherwise, determining the frequency adjustment based on a fine frequency error estimate in the plurality of fine frequency error estimates closest to a most recent previous fine frequency error estimate.

主权项

1. A method to determine a frequency adjustment by a mobile wireless device, the method comprising:
by the mobile wireless device: determining a coarse frequency error estimate; determining an accuracy range of the coarse frequency error estimate; determining a plurality of fine frequency error estimates; comparing the accuracy range to a frequency pull-in range for the plurality of fine frequency error estimates; and determining the frequency adjustment by testing a convergence of a frequency tracking loop based on two or more of the plurality of fine frequency error estimates when the accuracy range exceeds one-half the frequency pull-in range for the plurality of fine frequency error estimates.