发明名称 |
Carrier and data recovery and demodulation system |
摘要 |
A modulated carrier is received on a node (10) and then the I- and the Q-channels extracted with a local carrier clock (16) that is free-running relative to the modulated carrier. The I- and the Q-channels are then input to a digital signal processor (26) wherein a composite phase signal is generated representing the phase difference between the modulated carrier and the local carrier clock (16). The composite phase is output from a look-up table in an EPROM (30) and then the free-running phase the local carrier clock (16) and the modulated carrier is discriminated from the composite phase. The free-running phase is then subtracted from the composite phase to yield the phase modulation on the carrier.
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申请公布号 |
US5001727(A) |
申请公布日期 |
1991.03.19 |
申请号 |
US19890311145 |
申请日期 |
1989.02.15 |
申请人 |
TERRA MARINE ENGINEERING, INC. |
发明人 |
MCDAVID, WILLIAM T. |
分类号 |
H04L27/00;H04L27/233 |
主分类号 |
H04L27/00 |
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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