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Converter for converting a modulating signal with variable envelope to two modulating signals without variable envelope, transmitter using the converter and method for transmitting a modulated wave with variable envelope
Converter for converting a modulating signal with variable envelope to two modulating signals without variable envelope, transmitter using the converter and method for transmitting a modulated wave with variable envelope
A base band waveform generation circuit 10 calculates the equations: I1 = äI+Q . SQRT(4/a2 - 1)ü/2; Q1 = äQ-I . SQRT(4/a2 - 1)ü/2; I2 = äI-Q . SQRT(4/a2 - 1)ü/2; and Q2 = äQ+I . SQRT(4/a2 - 1)ü/2, based on I and Q of a modulating signal. Where, SQRT(x) refers to a square root of x, that is, a2=(I2)2 + (Q2)2. A quadrature modulator 12 quadrature modulates a carrier with the I1 and Q1. A quadrature modulator 22 quadrature modulates a carrier with the I2 and Q2. The output signals of the quadrature modulators 12 and 13 are amplified with a transmission power amplifiers 13 and 23, then composed. IMAGE
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机译：基带波形产生电路10计算等式：I1 ＝ΔI+ Q。 SQRT（4 / a <2>-1）ü/ 2; Q1 =äQ-I。 SQRT（4 / a <2>-1）ü/ 2; I2 =äI-Q。 SQRT（4 / a <2>-1）ü/ 2;和Q2 =äQ+ I。 SQRT（4 / a 2-1）ü/ 2，基于调制信号的I和Q。其中，SQRT（x）是指x的平方根，即a <2> =（I2）<2> +（Q2）<2>。正交调制器12使用I1和Q1对载波进行正交调制。正交调制器22使用I2和Q2对载波进行正交调制。正交调制器12和13的输出信号用发射功率放大器13和23放大，然后组成。 <图像>
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