Invention Grant
- Patent Title: Robust scalable and adaptive frequency estimation and frequency tracking for wireless systems
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Application No.: US14996007Application Date: 2016-01-14
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Publication No.: US09509544B2Publication Date: 2016-11-29
- Inventor: Zhu Ji , Johnson O. Sebeni , Yu-Lin Wang
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Downey Brand LLP
- Main IPC: H04B1/38
- IPC: H04B1/38 ; H04L27/26 ; H04L25/02 ; H04L27/00

Abstract:
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.
Public/Granted literature
- US20160134457A1 ROBUST SCALABLE AND ADAPTIVE FREQUENCY ESTIMATION AND FREQUENCY TRACKING FOR WIRELESS SYSTEMS Public/Granted day:2016-05-12
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