发明名称 |
Modes of operations in QAM modems using hysteresis sub-states |
摘要 |
A method of automated acquisition of a QAM signal is provided. The method employs a State machine progressing from an initial State to a final State. The State machine comprises: a symbol timing recovery loop; a carrier loop; a coarse frequency loop; and an equalizer. The method comprises: (A) Performing an automatic gain control (AGC) operation on an incoming QAM signal; (B) Performing a symbol timing recovery of an input QAM signal by adjusting a sampling clock of the symbol timing recovery loop; (C) Performing a Blind Equalization of the QAM signal without carrier lock; (D) Performing a carrier recovery of the QAM signal; and (E) Performing a decision directed equalization (DDE) of the QAM signal by updating a set of coefficients of the equalizer by using a decision based algorithm.
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申请公布号 |
US7970080(B1) |
申请公布日期 |
2011.06.28 |
申请号 |
US20090319773 |
申请日期 |
2009.01.12 |
申请人 |
WIDEBAND SEMICONDUCTOR, INC. |
发明人 |
ISAKSEN DAVID B.;FONG MARK |
分类号 |
H03D3/22;H04L27/22 |
主分类号 |
H03D3/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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