Modulators – Phase shift keying modulator or quadrature amplitude modulator
Patent
1993-12-29
1995-03-07
Grimm, Siegfried H.
Modulators
Phase shift keying modulator or quadrature amplitude modulator
332123, 332162, 455 63, 455126, 375261, 375284, 375285, H04L 2736
Patent
active
053961960
ABSTRACT:
A carrier leakage suppression circuit is disclosed which adaptively suppresses carrier leakage in a signal processing device which modulates a carrier signal with an in-phase baseband signal and a quadrature baseband signal to generate a radio frequency (RF) output signal. The carrier leakage suppression circuit operates by imparting a first signature to the in-phase baseband signal and a second signature to the quadrature baseband signal prior to modulation of the carrier signal. In-phase and quadrature carrier leakage components in the RF output signal are isolated and measured by respectively correlating the RF output signal with the first and second signatures. An in-phase offset and a quadrature offset are generated as a function of the measurement of the in-phase and quadrature carrier leakage components. The in-phase baseband signal is combined with the in-phase offset and the quadrature baseband signal is combined with the quadrature offset to thereby suppress carrier leakage.
REFERENCES:
patent: 4243955 (1981-01-01), Daniel et al.
patent: 4843351 (1989-06-01), Edwards et al.
patent: 5012208 (1991-04-01), Makinen et al.
AT&T Corp.
Grimm Siegfried H.
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