Invention Grant
- Patent Title: Time synchronization using spectral estimation in a communication system
- Patent Title (中): 在通信系统中使用频谱估计的时间同步
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Application No.: US11021694Application Date: 2004-12-22
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Publication No.: US07492828B2Publication Date: 2009-02-17
- Inventor: Arvind Vijay Keerthi
- Applicant: Arvind Vijay Keerthi
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agent Sandip S. Minhas; Stanton Braden; Thomas R. Rouse
- Main IPC: H04L27/06
- IPC: H04L27/06 ; H04L27/28

Abstract:
To perform time synchronization using spectral estimation, a receiver obtains a frequency response estimate for pilot symbols received on each set of frequency subbands used for pilot transmission. The receiver performs spectral estimation on frequency response estimates for different sets of subbands to obtain a measured arrival time for a transmission from a transmitter. The spectral estimation determines a dominant frequency component in the frequency response estimates and derives the measured arrival time based on this dominant frequency component. A time error between the measured arrival time and a desired arrival time is computed and possibly filtered. The filtered or unfiltered time error is scaled with a fixed or adjustable gain. A time adjustment is then generated based on the scaled time error and using linear and/or non-linear functions. The time adjustment is sent to the transmitter and used to adjust the transmit timing at the transmitter.
Public/Granted literature
- US20050282568A1 Time synchronization using spectral estimation in a communication system Public/Granted day:2005-12-22
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