High power transmitter employing a high power QAM modulator

Details High power transmitter employing a high power QAM modulator High power transmitter employing a high power QAM modulator

1997-08-15

1999-02-02

Mis, David

Modulators

Phase shift keying modulator or quadrature amplitude modulator

375264, 375308, H03C 300, H04L 2736

Patent

active

058670718

ABSTRACT:
A high power RF transmitter that uses high power modulators that perform quadrature amplitude modulation (QAM) on a carrier signal after power amplification that is performed in the RF carrier source. The present invention transposes the locations of the modulators and power amplifier, and thus directly modulates a high power carrier signal. An RF carrier source generates a high power RF carrier signal that is split by a power splitter. A lookup table containing 2.sup.B words by K bits receives transmit data and mapping data and generates K-tuple modulating data. A plurality of phase key modulators are respectively coupled to outputs of the power splitter and to the lookup table and phase key modulate each of the signal components of the carrier signal using the K-tuple modulating data. A power combiner is coupled to outputs of the phase key modulators for outputting a high power QAM constellation from the transmitter.

REFERENCES:
patent: 5237292 (1993-08-01), Chethik
patent: 5463355 (1995-10-01), Halloran

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