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 mobile wireless device comprising:
one or more processors; and a memory coupled to the one or more processors, wherein the memory comprises instructions that when executed by the one or more processors cause the mobile wireless device to:
determine a coarse frequency error estimate;obtain a set of frequency error values based on at least two channel impulse response estimates derived from samples received in two orthogonal frequency division multiplexing (OFDM) symbols;determine a plurality of fine frequency error estimates based on the set of frequency error values;select a first candidate fine frequency error estimate in the plurality of fine frequency error estimates, the first candidate fine frequency error estimate having a first frequency value closest to a corresponding frequency value for the coarse frequency error estimate; anddetermine a frequency adjustment based on the first frequency value.