发明公开
- 专利标题: AUTOMATIC FREQUENCY CONTROL FOR A WIRELESS COMMUNICATION SYSTEM WITH MULTIPLE SUBCARRIERS
- 专利标题(中): 自动频率控制与多个子载波无线通信系统
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申请号: EP06738527.8申请日: 2006-03-13
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公开(公告)号: EP1869767A2公开(公告)日: 2007-12-26
- 发明人: MURTHY, Vinay , GUPTA, Alok , CHUNG, Seong Taek , LING, Fuyun
- 申请人: Qualcomm Incorporated
- 申请人地址: 5775 Morehouse Drive San Diego, CA 92121 US
- 专利权人: Qualcomm Incorporated
- 当前专利权人: Qualcomm Incorporated
- 当前专利权人地址: 5775 Morehouse Drive San Diego, CA 92121 US
- 代理机构: Heselberger, Johannes
- 优先权: US660914P 20050311
- 国际公布: WO2006099532 20060921
- 主分类号: H03J7/04
- IPC分类号: H03J7/04
摘要:
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.
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