发明授权
- 专利标题: Joint de-spreading and frequency correction using a correlator
- 专利标题(中): 使用相关器进行联合解扩和频率校正
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申请号: US11678422申请日: 2007-02-23
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公开(公告)号: US07889782B2公开(公告)日: 2011-02-15
- 发明人: Robert Mark Gorday , Jorge Ivonnet
- 申请人: Robert Mark Gorday , Jorge Ivonnet
- 申请人地址: US TX Austin
- 专利权人: Freescale Semiconductor, Inc.
- 当前专利权人: Freescale Semiconductor, Inc.
- 当前专利权人地址: US TX Austin
- 主分类号: H04B1/00
- IPC分类号: H04B1/00
摘要:
A correlator (140) for de-spreading a spread-spectrum signal includes a state machine (205), a frequency correction look-up table (207), a pseudorandom code generator (209), and a correlator structure (301 and 801). The spread-spectrum signal includes symbols, and each symbol includes a plurality of chips. The correlator structure includes a plurality of taps (309 and 809) at which a coordinate rotation digital computer (CORDIC) operation is performed to determine an offset from a nominal carrier frequency of the spread-spectrum signal and to change a phase of each chip of a received symbol, in order to correct a carrier frequency of the spread-spectrum signal while de-spreading the spread-spectrum signal.
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