发明授权
US4574246A Demodulator with AGC circuit for multi-level quadrature
amplitude-modulated carrier wave
失效
具有AGC电路的解调器用于多电平正交调幅载波
- 专利标题： Demodulator with AGC circuit for multi-level quadrature amplitude-modulated carrier wave
- 专利标题（中）： 具有AGC电路的解调器用于多电平正交调幅载波
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申请号： US589265申请日： 1984-03-13
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公开(公告)号： US4574246A公开(公告)日： 1986-03-04
- 发明人: Yasuharu Yoshida
- 申请人： Yasuharu Yoshida
- 申请人地址： JPX Tokyo
- 专利权人： NEC Corporation
- 当前专利权人： NEC Corporation
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX58-43495 19830316
- 主分类号： H04B3/06
- IPC分类号： H04B3/06 ; H04B3/04 ; H04L27/34 ; H04L27/38 ; H03D3/00
摘要：
A demodulator for a multi-level quadrature amplitude-modulated carrier wave includes an AGC amplifier receiving the multi-level quadrature amplitude-modulated wave, the amplifier output being coupled to a quadrature phase demodulator producing an inphase and quadrature-phase demodulated signal. An automatic gain control amplifier receives an output of the quadrature-phase demodulator to compensate for the gain difference between the inphase and quadrature-phase signals. The gain difference compensated inphase and quadrature-phase signals are applied to first and second multi-level discriminators.
公开/授权文献
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