Invention Grant
- Patent Title: Automatic frequency control for a wireless communication system with multiple subcarriers
- Patent Title (中): 具有多个子载波的无线通信系统的自动频率控制
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Application No.: US11372931Application Date: 2006-03-09
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Publication No.: US08009775B2Publication Date: 2011-08-30
- Inventor: Vinay Murthy , Alok Kumar Gupta , Seong Taek Chung , Fuyun Ling
- Applicant: Vinay Murthy , Alok Kumar Gupta , Seong Taek Chung , Fuyun Ling
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agent Ryan N. Farr
- Main IPC: H04L27/06
- IPC: H04L27/06 ; H04L7/00 ; H04L27/00

Abstract:
Techniques for performing frequency control in an OFDM system are described. In one aspect, frequency acquisition is performed based on a received pilot, and frequency tracking is performed based on received OFDM symbols. For frequency acquisition, an initial frequency error estimate may be derived based on the received pilot, and an automatic frequency control (AFC) loop may be initialized with the initial frequency error estimate. For frequency tracking, a frequency error estimate may be derived for each received OFDM symbol, and the AFC loop may be updated with the frequency error estimate. Frequency error in input samples is corrected by the AFC loop with the initial frequency error estimate as well as the frequency error estimate for each received OFDM symbol. In another aspect, a variable number of samples of a received OFDM symbol are selected, e.g., based on the received OFDM symbol timing, for use for frequency error estimation.
Public/Granted literature
- US20060215778A1 Automatic frequency control for a wireless communication system with multiple subcarriers Public/Granted day:2006-09-28
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