发明授权
- 专利标题: Carrier tracking loop for QPSK demodulator
- 专利标题(中): 用于QPSK解调器的载波跟踪环路
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申请号: US322847申请日: 1994-10-13
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公开(公告)号: US5579345A公开(公告)日: 1996-11-26
- 发明人: Brian W. Kroeger , Jeffrey S. Baird , Joseph B. Bronder
- 申请人: Brian W. Kroeger , Jeffrey S. Baird , Joseph B. Bronder
- 申请人地址: PA Pittsburgh
- 专利权人: Westinghouse Electric Corporation
- 当前专利权人: Westinghouse Electric Corporation
- 当前专利权人地址: PA Pittsburgh
- 主分类号: H04L27/00
- IPC分类号: H04L27/00 ; H04L27/233 ; H04L27/06 ; H03D3/22
摘要:
A carrier tracking loop that uses a frequency locked loop (FLL) and incorporates synchronized matched filters to minimize complexity of the system. The synchronized matched filters eliminate out-of-band interference while minimizing computation. The carrier tracking loop has an improved error signal generation to extend a frequency range and by employing error signal normalization, which extends the dynamic range of the amplitude of the input signal and allows the frequency to flywheel when signal fading occurs.
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