发明公开
- 专利标题: DIRECT DIGITAL SYNTHESIS IN A QAM DEMODULATOR
- 专利标题(中): 直接数字合成IN A QAM DEMUDULATOR
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申请号: EP01274202.9申请日: 2001-02-12
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公开(公告)号: EP1299979A1公开(公告)日: 2003-04-09
- 发明人: MAALEJ, Khaled , HAMMAN, Emmanuel , DEMOL, Amaury , LEVY, Yannick
- 申请人: ATMEL CORPORATION
- 申请人地址: 2325 Orchard Parkway San Jose,California 95131 US
- 专利权人: ATMEL CORPORATION
- 当前专利权人: ATMEL CORPORATION
- 当前专利权人地址: 2325 Orchard Parkway San Jose,California 95131 US
- 代理机构: Käck, Jürgen
- 优先权: US550556 20000417
- 国际公布: WO02103976 20021227
- 主分类号: H04L27/38
- IPC分类号: H04L27/38
摘要:
A QAM demodulator is disclosed, which comprises two direct digital synthesizer circuits, for the provision of carrier synchronisation. The first DDS is located upstream of the receivers root-raised-cosine filter, and ensures frequency synchronisation, whilst the second DDS is downstream of the filter and ensures phase synchronisation.
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