Transmitter and method for transmitting a modulated wave with va

Details Transmitter and method for transmitting a modulated wave with va Transmitter and method for transmitting a modulated wave with va

1995-12-06

1998-07-21

Chin, Stephen

Pulse or digital communications

Transmitters

Angle modulation

332103, H03C 300

Patent

active

057844127

ABSTRACT:
A base band waveform generation circuit 10 calculates the equations: I.sub.1 ={I+Q.multidot.SQRT(4/a.sup.2 -1)}/2; Q.sub.1 ={Q-I.multidot.SQRT(4/a.sup.2 -1)}/2; I.sub.2 ={I-Q.multidot.SQRT(4/a.sup.2 -1)}/2; and Q.sub.2 ={Q+I.multidot.SQRT(4/a.sup.2 -1)}/2, based on I and Q of a modulating signal. Where, SQRT(x) refers to a square root of x, that is, a.sup.2 =(I.sub.2).sup.2 +(Q.sub.2).sup.2. A quadrature modulator 12 quadrature modulates a carrier with the I.sub.1 and Q.sub.1. A quadrature modulator 22 quadrature modulates a carrier with the I.sub.2 and Q.sub.2. The output signals of the quadrature modulators 12 and 13 are amplified with a transmission power amplifiers 13 and 23, then composed.

REFERENCES:
patent: 4485358 (1984-11-01), Andren et al.

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