Invention Grant
- Patent Title: Dual-loop automatic frequency control for wireless communication
- Patent Title (中): 双回路自动频率控制用于无线通信
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Application No.: US11358996Application Date: 2006-02-21
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Publication No.: US08401503B2Publication Date: 2013-03-19
- Inventor: Seong Taek Chung , Vinay Murthy , Alok Kumar Gupta , Fuyun Ling
- Applicant: Seong Taek Chung , Vinay Murthy , Alok Kumar Gupta , Fuyun Ling
- Applicant Address: US CA San Diego
- Assignee: Qualcomm Incorporated
- Current Assignee: Qualcomm Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Fulbright & Jaworski L.L.P.
- Main IPC: H04B1/18
- IPC: H04B1/18

Abstract:
Techniques for performing frequency control using dual-loop automatic frequency control (AFC) are described. The dual-loop AFC includes an inner loop that corrects short-term frequency variations (e.g., due to Doppler effect) and an outer loop that corrects long-term frequency variations (e.g., due to component tolerances and temperature variations). In one design, a first inner loop is implemented for frequency control of a first system (e.g., a broadcast system), a second inner loop is implemented for frequency control of a second system (e.g., a cellular system), and at least one outer loop is implemented for adjusting a reference frequency used to receive signals from the first and second systems. Each inner loop estimates and corrects the frequency error in an input signal for the associated system and may be enabled when receiving the input signal from the system. The reference frequency may be used for frequency downconversion, sampling and/or other purposes.
Public/Granted literature
- US20060203950A1 Dual-loop automatic frequency control for wireless communication Public/Granted day:2006-09-14
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