发明名称 |
QPSK system with one cycle per Baud period |
摘要 |
In a QPSK system using one cycle of a squared-off sinusoid per Baud period to represent the data dibits, the following are disclosed: (1) a direct detection circuit using samples taken only during the second and third quarters of the Baud period; (2) timing recovery by recognition of the opposite polarity of any QPSK signal compared to a half-Baud-delayed version of itself; and (3) an encoding scheme wherein only one of the two dibits is differentially encoded.
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申请公布号 |
US4584693(A) |
申请公布日期 |
1986.04.22 |
申请号 |
US19830554668 |
申请日期 |
1983.11.23 |
申请人 |
COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT-ALCATEL |
发明人 |
LEVY, MICHEL;SURIE, SERGE |
分类号 |
H04L25/49;(IPC1-7):H04L27/18 |
主分类号 |
H04L25/49 |
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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