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

A mobile wireless device comprising:

• wireless circuitry including at least one transceiver;
• one or more processors coupled to the wireless circuitry;
• and
• a memory coupled to the one or more processors,
• wherein the one or more processors are configured to execute computer-executable instructions stored within the memory to cause the mobile wireless device to:
• determine a coarse frequency error estimate;
• determine a plurality of fine frequency error estimates;
• calculate a confidence metric for the coarse frequency error estimate;
• compare the confidence metric to a threshold value;
• when the confidence metric exceeds the threshold value, determine a frequency adjustment based on a candidate fine frequency error estimate in the plurality of fine frequency error estimates that is closest to the coarse frequency error estimate;
• and
• when the confidence metric does not exceed the threshold value, determine the frequency adjustment based on a fine frequency error estimate in the plurality of fine frequency error estimates that is closest to a most recent previous fine frequency error estimate.

A non-transitory computer readable medium having computer program code encoded thereon, the computer program code, when executed by one or more processors, causes a mobile wireless device to:

• determine a coarse frequency error estimate;
• determine a plurality of fine frequency error estimates;
• select at least one candidate fine frequency error estimate in the plurality of fine frequency error estimates, the at least one candidate fine frequency error estimate having a frequency value that is closest to a corresponding frequency value for the coarse frequency error estimate;
• and
• determine a frequency adjustment based on a combination of the coarse frequency error estimate and the selected at least one candidate fine frequency error estimate.