发明名称 |
Constant envelope quadrature-quadrature amplitude modulation system |
摘要 |
A constant envelope quadrature-quadrature amplitude modulation system limits the data, which will be transmitted, to 4-bit and adds 4-bit parity to make them have a constant envelope in the Q2AM system, which modulates 8-bit in units of 2-bit. The system includes: a constant envelope encoder 52 for adding 4-bit parity to 4-bit input information; four mappers 12 to 15 for respectively generating level signals corresponding to data values of 2-bit among 8-bit data generated by the constant envelope encoder 52; four mixers 16 to 19 for respectively mixing the level signals generated by the four mappers 12 to 15 with different predetermined frequency signals; and adder 20 for adding up the signals generated by the four mixers 16 to 19.
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申请公布号 |
US5920237(A) |
申请公布日期 |
1999.07.06 |
申请号 |
US19970971061 |
申请日期 |
1997.11.14 |
申请人 |
DAEWOO TELECOM LTD |
发明人 |
PARK, IN JAE;LEE, WOO HYUNG |
分类号 |
H04L27/34;H04L27/20;(IPC1-7):H04L27/36 |
主分类号 |
H04L27/34 |
代理机构 |
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主权项 |
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地址 |
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