发明授权
- 专利标题: Method and apparatus for time tracking
- 专利标题(中): 为时间跟踪的方法和装置
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申请号: EP00907220.8申请日: 2000-02-08
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公开(公告)号: EP1151547B1公开(公告)日: 2006-04-12
- 发明人: LEVIN, Jeffrey, A. , RIDDLE, Christopher, C. , SHERMAN, Tom
- 申请人: QUALCOMM INCORPORATED
- 申请人地址: 5775 Morehouse Drive San Diego, CA 92121-1714 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 92121-1714 US
- 代理机构: Geyer, Ulrich F.
- 优先权: US246446 19990208
- 国际公布: WO2000046935 20000810
- 主分类号: H04B1/707
- IPC分类号: H04B1/707
摘要:
In order to time track an incoming signal, a receiver demodulates a first instance of a signal to produce a first set of energy values corresponding to a set of possible data values of the signal (200, 270). The receiver also demodulates a second instance of the signal to produce a second set of energy values corresponding to the set of possible data values (208, 272). The receiver combines the first and the second sets of energy values to determine a combined set of energy values (210, 276). The receiver determines a first estimate of a most likely transmitted data value based upon the combined set of energy values (202, 278). The receiver decovers an early set of despread samples of the first instance using a symbol corresponding to the first estimate to produce a first early energy value. The receiver decovers a late set of despread samples of the first instance using the symbol corresponding to the first estimate to produce a first late energy value (214, 284). Finally, the receiver determines a time offset of the first instance based upon the first early and the first late energy values.
公开/授权文献
- EP1151547A1 METHOD AND APPARATUS FOR TIME TRACKING 公开/授权日:2001-11-07
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