Modulator |
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| 申请号 | JP5713885 | 申请日 | 1985-03-20 | 公开(公告)号 | JPS61214843A | 公开(公告)日 | 1986-09-24 |
| 申请人 | Nec Corp; | 发明人 | NAGATA YOSHIAKI; | ||||
| 摘要 | PURPOSE:To perform compensation which does not degrade a transmission spectrum, by rewriting adaptively contents of a memory in accordance with the output of a correcting signal generating circuit. CONSTITUTION:Signals 111-I and 111-Q inputted from terminals 101 and 102 are distorted by a memory 120 for the purpose of compensating the nonlinearity of an amplifier to output complex signals 121-I and 121-Q, and these signals are converted to analog signals, and the output of an oscillator 141 is modulated in an orthogonal modulator 140 and is inputted to the amplifier from an output terminal 104. A part of the amplifier output is inputted from an input terminal 103, and demodulated complex base band signals 149-I and 149-Q are sampled and quantized by an A/D converter 150 and are subtracted from signals 111-I and 111-Q by a subtractor 160, and subtraction results are multiplied by P in a correcting quantity generating circuit 170 and are added to the output of a RAM 120 in an adding circuit 180 to output signal 171-I and 171-Q, and contents of the memory are rewritten. | ||||||
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| 说明书全文 | |||||||
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