Converter for converting a modulating signal with variable...

H - Electricity – 03 – C

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H03C 3/04 (2006.01) H03F 1/02 (2006.01) H04L 27/20 (2006.01)

Patent

CA 2164465

A base band waveform generation circuit 10 calculates the equations: I1 = {I+Q SQRT(4/a2 - 1)}/2; Q1 = {Q-I SQRT(4/a2 - 1)}/2; I2 = {I-Q SQRT(4/a2 - 1)}/2; and Q2 = {Q+I SQRT(4/a2 - 1)}/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.

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