发明名称 |
MULTILEVEL MODULATOR CAPABLE OF PRODUCING A COMPOSITE MODULATED SIGNAL COMPRISING A QUADRATURE AMPLITUDE MODULATED COMPONENT AND A PHASE MODULATED COMPONENT |
摘要 |
<p>Responsive to a first and a second main data signal and a subdata signal, a multilevel modulator produces a composite modulated signal which comprises a quadrature amplitude modulated component modulated by the first and the second main data signals and represented by a radius on a phase plane and a phase modulated component modulated by the subdata signal are represented by a clockwise and a counterclockwise shift on the phase plane. A multilevel demodulator carries out an inverse operation to reproduce the composite modulated signal into first and second reproduced main data signal and a reproduced subdata signal.</p> |
申请公布号 |
CA1268828(A) |
申请公布日期 |
1990.05.08 |
申请号 |
CA19870529181 |
申请日期 |
1987.02.06 |
申请人 |
NEC CORPORATION |
发明人 |
YOSHIDA, YASUHARU |
分类号 |
H04L27/34;H04L27/36;H04L27/38;(IPC1-7):H03C5/00;H03D3/22;H03D1/00 |
主分类号 |
H04L27/34 |
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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